JP5642268B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that heats an object to be heated on a top plate from below the top plate.

A cooking device that heats an object to be heated, such as a metal pan, with a heating coil has been recognized by consumers as having excellent features such as safety, cleanliness, and high efficiency.
Such induction heating cookers can be either a stationary type that is placed on the top surface of a sink or the like depending on the installation form, and a built-in type that is set in an installation space in kitchen furniture such as a sink. In any type, almost all of the upper surface is covered with a top plate (also called a top plate) formed of a heat-resistant glass plate or the like, and below that is one or more induction heatings. The source is arranged. As the induction heating source, a plurality of annular heating coils and a high-frequency generating power circuit (also referred to as an inverter circuit) that supplies high-frequency power to each of the heating coils are used (see, for example, Patent Document 1). According to such a configuration, since the output control of the high frequency power to each heating coil can be performed individually, various heating patterns can be formed.

  As another induction heating cooker, a circular heating coil is placed in the center, a plurality of side heating coils are arranged so as to be adjacent to both sides of the center heating coil, and the central heating coil and the side heating coil are separately provided. In the case of driving with a high frequency generation power circuit, induction induction generated between the side heating coil and the central heating coil is considered by considering the direction of the high frequency current flowing through the plurality of side heating coils and the central heating coil. There is one that can be used for applications such as canceling electric power and simultaneously heating a wide planar area (see, for example, Patent Document 2).

  Furthermore, three or more induction heating units and a grill unit for cooking fish or the like are provided at the lower part of the top plate, and a display unit is provided in a lower space at the center of the top plate, and the induction heating unit and grill unit There is also an induction heating cooker that displays the operation content of (see, for example, Patent Document 3).

Japanese Patent No. 2978069 (first page, second page, FIG. 1) Japanese Patent No. 3725249 (first page, second page, FIG. 3) JP 2003-287233 A (first page, FIG. 1)

  As described above, when a display unit equipped with an induction heating unit or a liquid crystal screen is installed below the top plate of a limited area, it is particularly large and non-circular pans (rectangular pans and pottery). When heating the induction coil by increasing the outer diameter size of the induction heating unit so that it can heat the cooking iron plate and the like, and increasing the number of heating coils to be driven and driving them simultaneously, the display unit has two or more display units. There is a concern that leakage magnetic flux from the heating coil may affect, and there is a concern that accurate information cannot be stably displayed.

  The present invention has been made in view of the above problems, and can heat one object to be heated simultaneously by a main heating coil in the center and a plurality of side heating coils arranged around the main heating coil. The main object of the present invention is to obtain an easy-to-use induction heating cooker that includes a display unit and includes a display unit that can reduce the influence of leakage magnetic flux of the heating unit and expect a stable display operation.

An induction heating cooker according to a first invention includes a main body whose top surface is covered with a top plate, an induction heating unit and a display unit arranged in a component chamber inside the main body, and a high-frequency current in the induction heating unit. An inverter circuit for supplying the inverter circuit, and an energization control unit for controlling the inverter circuit and the display unit, and the induction heating unit is disposed in the vicinity of an annular main heating coil in the center portion. A plurality of side heating coils that maintain a predetermined space between each other, and the energization control unit drives the inverter circuit to perform independent heating of the main heating coil and between the main heating coil and the side heating coil. Cooperative heating is possible, and a display screen of the display unit is arranged in a direction opposite to the main heating coil with a space between the side heating coils interposed therebetween . Said side When supplying from said inverter circuit to the heat coil a high-frequency current at the same time, in which high frequency current in the same direction in mutually adjacent regions of the two side heating coils. As a result, it is possible to perform independent heating of the main heating coil and cooperative heating of the main heating coil and the side coil on the limited top plate. This improves the usability and can protect the display unit from the influence of magnetic flux leaking from the two adjacent side heating coils, so that a stable display operation can be expected.

An induction heating cooker according to a second aspect of the present invention includes a main body whose top surface is covered with a top plate, a first induction heating unit disposed in a component chamber inside the main body, and left and right, and a second Located between the induction heating unit and the straight line in the front-rear direction passing through each center point in front of the straight line connecting the center points of the first induction heating unit and the second induction heating unit, A display screen of a display unit housed in the component room, an inverter circuit for supplying a high-frequency current to the first and second induction heating units, and an energization control unit for controlling the inverter circuit and the display unit. The first induction heating unit includes an annular main heating coil in a central portion and a plurality of side heating coils that are disposed in the vicinity of the central heating coil and maintain a predetermined space with each other. The induction heating unit 2 includes an annular heating coil, and the energization control Drive the inverter circuit to enable independent heating of the main heating coil and cooperative heating of the main heating coil and the side heating coil, respectively, and sandwich the space between the side heating coils, When the display screen of the display unit is arranged in the direction opposite to the main heating coil, and the energization control unit simultaneously supplies high frequency current from the inverter circuit to the two adjacent side heating coils, two side units A high-frequency current is caused to flow in the same direction in regions adjacent to each other of the heating coil . Thus, the first and second induction heating units can individually cook on the limited top plate, and the first induction heating unit can perform independent heating of the main heating coil and the main heating coil. And the side coil can be cooperatively heated, not only a normal round pan, but also non-circular, etc., improving usability and from the influence of magnetic flux leaking from two adjacent side heating coils The display portion can be protected and stable display operation can be expected.

  According to the present invention, one object to be heated can be heated by a circular main heating coil and a plurality of side heating coils arranged around the main heating coil, and a display unit installed in a space below the top plate is provided. An induction heating cooker that can prevent malfunction due to the influence of leakage magnetic flux from the side heating coil and that is easy to use and has a stable display operation can be provided.

It is a block diagram which shows the basic composition of the whole built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a top view of the built-in type induction heating cooking appliance main body which concerns on Embodiment 1 of this invention. It is a block diagram which shows the display part structure of the built-in type induction heating cooking appliance main body which concerns on Embodiment 1 of this invention. In the built-in induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is a top view of the heating coil of the 1st induction heating part. In the built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is heating operation explanatory drawing 1 of the heating coil of a 1st induction heating part. In the built-in induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is the electricity supply explanatory drawing 1 of the heating coil of the 1st induction heating part. It is control step explanatory drawing which shows the basic heating operation | movement of the whole built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a top view which shows the modification of the heating coil of the 1st induction heating part in the built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention. In the built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is the electricity supply explanatory drawing 2 of the heating coil of the 1st induction heating part. In the built-in induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is the electricity supply explanatory drawing 3 of the heating coil of the 1st induction heating part. In the built-in type induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is heating operation explanatory drawing 2 of the heating coil of a 1st induction heating part. In the built-in induction heating cooking appliance which concerns on Embodiment 1 of this invention, it is an expansion explanatory drawing of the heating coil of the 1st induction heating part. It is a perspective view which partially decomposes | disassembles and shows the whole built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a perspective view which shows the whole main-body part in the state which removed the top-plate part of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view of the whole main-body part of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a disassembled perspective view of the state which removed main components, such as an up-and-down partition plate of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a D1-D1 line longitudinal cross-sectional view of FIG. It is the D2-D2 line longitudinal cross-sectional view of FIG. It is a principal part perspective view which fractures | ruptures and shows a part case and part of cooling duct of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view for arrangement | positioning description of the heating coil of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view which shows the 1st induction heating source in the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is wiring explanatory drawing of the main heating coil of the 1st induction heating source in the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. In the built-in induction heating cooking appliance which concerns on Embodiment 2 of this invention, it is a fragmentary top view which expands and shows a 1st induction heating source. In the built-in induction heating cooking appliance which concerns on Embodiment 2 of this invention, it is a top view of the coil support body of a 1st induction heating source. It is a control circuit whole figure of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a full bridge system circuit diagram used as the principal part of the control circuit of the built-in induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a simplification figure of the full bridge system circuit used as the control circuit principal part of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. In the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention, it is a longitudinal cross-sectional view in case the large-diameter pan is placed and heated by the 1st induction heating source. It is a longitudinal cross-sectional view which shows the 1st induction heating source part in the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view which shows the integrated display means of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a block diagram which shows the display part structure of the built-in type induction heating cooking appliance main body which concerns on Embodiment 2 of this invention. It is a top view which shows the example of a display screen of the integrated display means in the case of using only the 1st induction heating source in the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view which shows the example of a display screen of the integrated display means in the case of using only the 1st induction heating source in the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. In the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention, it is a top view which shows the example of a display screen of an integrated display means in the case of performing high-speed heating cooking with the 1st induction heating source. It is control step explanatory drawing which shows the basic heating operation | movement of the whole built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a flowchart 1 of control operation of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a flowchart 2 of control operation of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is the flowchart 3 which shows the control action in the case of changing the heating power of the built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention, and is a figure which shows the value of the main heating coil in the case of thermal power 3000W and 1500W, and a subheating coil thermal power value (heating power). It is a built-in type induction heating cooking appliance which concerns on Embodiment 2 of this invention, and is a figure which shows the value of the main heating coil MC in the case of 500 W of heating power, and a subheating coil heating power value (heating power). It is a top view of the state which removed the top plate 21 of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is arrangement | positioning description of a heating coil and a display part of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the relationship between the heating coil of a 2nd induction heating part, and an inverter circuit of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the operation | movement of the display screen of an integrated display means, and a thermal-power display part of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is operation | movement explanatory drawing 1 which shows the modification of the display screen of the integrated display means of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is operation | movement explanatory drawing 2 which shows the modification of the display screen of the integrated display means of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a top view of the main-body part A of the induction heating cooking appliance which concerns on Embodiment 4 of this invention. It is a longitudinal cross-sectional view in the D3-D3 line | wire of FIG.

Embodiment 1 FIG.
FIGS. 1-12 shows the induction heating cooking appliance which concerns on Embodiment 1 of this invention, Comprising: The example of the built-in (built-in) type induction heating cooking appliance is shown.
FIG. 1 is a block diagram showing the basic configuration of the entire induction heating cooker according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the induction heating cooker body according to Embodiment 1 of the present invention. FIG. 3 is a block diagram showing the configuration of the display unit of the built-in induction heating cooker main body according to Embodiment 1 of the present invention. FIG. 4 is a plan view of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 5 is an explanatory diagram 1 of the heating operation of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 6 is an explanatory diagram 1 of energization of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 7 is an explanatory diagram of control steps showing the basic heating operation of the entire induction heating cooker according to the first embodiment of the present invention. FIG. 8 is a plan view showing a modification of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 9 is an explanatory diagram 2 of energization of the heating coil in the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 10 is an explanatory diagram 3 of energization of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. FIG. 11 is an explanatory diagram 2 of the heating operation of the heating coil of the first induction heating unit in the induction heating cooker according to the first embodiment of the present invention. FIG. 12 is an enlarged explanatory diagram of the heating coil of the first induction heating unit in the induction heating cooker according to Embodiment 1 of the present invention. In addition, the same code | symbol is attached | subjected to the same part or each equivalent part in each figure.

Terms used in the embodiments of the present invention are defined respectively.
“Operating conditions” of the heating means D refer to electrical and physical conditions for heating, and is a generic term for energization time, energization amount (thermal power), heating temperature, energization pattern (continuous energization, intermittent energization, etc.) It is a thing. That is, it refers to the energization condition of the heating means D.

  “Display” refers to the operating conditions of cooking utensils and related information that is helpful for cooking (changes in characters, symbols, illustrations, colors, presence / absence of light emission, luminance, etc.) Including the purpose of notifying the occurrence of a condition, hereinafter referred to simply as “cooking related information”). However, the “display” in the case where “broad-area light emitting unit” or “individual light emitting unit” to be described later emits light and displays and “first display” and “second display” are simply light emission, Turns on and emits light of a predetermined color. If the lighting mode or visual effect is changed, such as light color, brightness, or continuous lighting and blinking status, the display is “changed” or “switched”. And so on. In addition, “light emission” and “lighting” have the same meaning, but when a light emitting element such as a light emitting diode emits light, it is often referred to as light emission, and when a lamp emits light, it is often referred to as lighting. , Light emission, lighting, etc. may be written together. In addition, even if it is electrically or physically emitted or lit, if the user only reaches a weak light that cannot be visually confirmed by the user, the user shall give the result of “emission” or “on”. Since it cannot be confirmed, it does not fall under the terms “light emission” or “lighting” unless otherwise specified. For example, the top plate to be described later is generally not colorless and transparent, and the material itself has a light color before painting on the surface. Therefore, the transmittance of visible light is not 100%. And the light cannot be seen from above the top plate.

  Unless otherwise specified, “display means” of the display unit includes two types of liquid crystal (LCD), various light emitting elements (LED (Light Emitting Diode) as an example of a semiconductor light emitting element), and LD (Laser Diode). An organic electroluminescence (EL) element, and the like. For this reason, the display means includes a display screen such as a liquid crystal screen or an EL screen. However, the display means of “broad-area light emitting section” and “individual light emitting section” described later may be a simple light emitting means such as a lamp or LED.

  “Notification” refers to an operation for notifying the user of the operating conditions of the control means and cooking-related information through display or electrical sound (refers to electrically generated or synthesized sound).

  The “notification unit” includes a notification unit using audible sounds such as a buzzer and a speaker, and a notification unit using characters, symbols, illustrations, animation, or visible light unless otherwise specified.

  “Cooperative heating” refers to an operation in which electric power is supplied to each of two or more heating coils serving as induction heating sources to induction-heat the same object to be heated.

  Hereinafter, Embodiment 1 of the induction heating cooker according to the present invention will be described in detail with reference to FIGS.

  1 and 2, the induction heating cooker of the present invention is a so-called three-mouth induction heating cooker including two induction heating units 6L and 6L and one radiant central electric heating unit 7. A main body A having a horizontally long rectangle (also referred to as a horizontal rectangle) in a plan view is provided. The main body portion A includes a top plate portion B in which the entire upper surface of the main body portion A is covered with a top plate 21, a casing portion C (not shown) that constitutes a periphery (outside) other than the upper surface of the main body portion A, Heating means D (such as a first induction heating source 6L to be described later) for heating a pot, food, etc., etc., operating means E operated by the user, and heating means in response to a signal from the operating means And a display means G for displaying the operating conditions of the heating means.

  Further, as a part of the heating means D, there is an electric heating means which is not used in the first embodiment but is called a grill box (grill heating chamber) or a roaster. In FIG. 1, E1 is an input operation on the operating means E provided on the upper front part of the main body A by a touch key for detecting the presence or absence of input using a change in capacitance, a pressing key having a mechanical electrical contact, or the like. The second selection unit, E2 is the second selection unit, and E3 is the third selection unit. The user can select various cooking menus described later by operating these selection units. Features of the functions of the selection units E1 to E3 will be described in detail later.

1 and 2, a first induction heating unit 6L is installed on the left side of the left and right center line CL1 of the main body A, and a second induction heating unit 6R is installed on the right side.
BL is a straight line connecting the center points X1 and X2 of the first induction heating unit 6L and the second induction heating unit 6R that are separated from each other on the left and right, and FL is a first induction heating unit 6L and a second induction. It is a straight line connecting the foremost end of the heating unit 6R.
In the display screen 100 of the display means G, the rear part thereof extends further to the rear than the front straight line FL.

  MC is a main heating coil of the first induction heating unit 6L, and is arranged close to a lower portion of a top plate (not shown) on which the object to be heated N is placed. In the figure, the outline of the heated object N such as a pan is shown by a broken circle.

  Further, the main heating coil MC has 19 thin wires of about 0.1 mm to 0.3 mm in a spiral shape or a bundle of two or four times the number, and this bundle (hereinafter referred to as a collective wire) is 1 It is wound while twisting one or a plurality of wires, and finally formed into a disk shape (also referred to as a “ring shape”) so that the outer shape is circular with the center point X1 as a base point. The diameter (maximum outer diameter dimension) of the main heating coil MC is about 128 mm as shown in FIG. 4, and the radius R1 is about 64 mm. In addition, the dimension described in the following description is an example, and is an approximate numerical value. In the first embodiment, the main heating coil MC has a maximum power consumption (maximum heating power) of 1500 W.

  SC1 to SC4 are four elongated sub-heating coils (also referred to as “side coils”), which are symmetrical in the front-rear, left-right, and equidistant directions with respect to the center point X1 of the main heating coil MC. The transverse dimension when viewed radially from the center point X1, that is, the “short diameter” (also referred to as “thickness” or “horizontal dimension”) WA is smaller than the radius R1 of the main heating coil MC.

First Dimensional Example In the examples of FIGS. 1, 2, and 12, the WA is set to 48 mm, and the width W31 of the inner space 272 is set to about 18 mm. The major axis MW is about four times the minor axis. That is, it is about 144 mm (when the major axis is 144 mm and the minor axis is 48 mm, the ratio between them is 3: 1). The facing distance GP1 between the outermost part of the main heating coil MC and the side coils SC1 to SC4 is 10 mm. The coil width is about 15 mm over the entire circumference.

Second dimension example WA is 40 mm. The major axis MW is about 3.5 times the minor axis. That is, it is about 150 mm (ratio of major axis and minor axis is 3.5: 1). The facing distance GP1 between the outermost part of the main heating coil MC and the side coils SC1 to SC4 is 7 mm. The coil width is 15 mm.
In addition, when explaining the dimensional relationship of each component part in FIGS. 3-12, it demonstrates on the basis of a 1st dimension example.

  In addition, the “side” of the main heating coil MC includes the upper side and the lower side (front side) as well as the right side and the left side in FIG. "" Means both the left and right sides, as well as the front and rear and diagonal directions.

  The four sub-heating coils SC1 to SC4 are arranged with a predetermined space 271 maintained on the outer peripheral surface of the main heating coil MC. This space 271 is the same as GP1 in FIG. Since the sub-heating coils SC <b> 1 to SC <b> 4 are substantially equally spaced from each other, it can be said that the predetermined space 273 is maintained. The sub-heating coils SC1 to SC4 are also wound while twisting one or a plurality of assembly wires, and the assembly wires are wound in a predetermined direction so that the outer shape becomes an oval or an oval shape, and then the portions are used to maintain the shape. It is formed by being constrained by a binding tool or being solidified with a heat resistant resin or the like. The four sub-heating coils SC1 to SC4 have the same planar shape, and the vertical, horizontal, and height (thickness) dimensions are all the same. Accordingly, four sub-heating coils are manufactured and arranged at four locations. The size (width dimension) of the space 273 is 20 mm.

As shown in FIG. 3, these four sub-heating coils SC1 to SC4 have a tangent direction around the main heating coil MC having a radius R1 from the center point X1, and the longitudinal center line of each sub-heating coil SC1 to SC4. Is consistent with In other words, it coincides with the major axis direction.
The sub-heating coils SC1 to SC4 each form a closed circuit electrically extending while the respective collecting wires are bent into an oval shape. Further, the vertical dimension (also referred to as “height dimension” or “thickness”) of the main heating coil MC and the vertical dimension of each of the sub-heating coils SC1 to SC4 are the same, and the upper surface thereof and the lower surface of the top plate. The space between and is horizontally installed and fixed so as to have the same dimension.

  In FIG. 4, DW indicates the maximum outer diameter dimension of an object N to be heated such as a metal pan that can be induction heated by the first induction heating source. From the diameter of the main heating coil MC and the thickness WA of the sub-heating coils SC1 to SC4 as described above, in the example of FIG. 4, the object to be heated N whose bottom dimension DW is about 260 mm can be induction-heated. The maximum outer diameter dimension DW is about 10 to 40 mm larger than the diameter DB of the circle shown in FIG. The diameter DB of the circle is about 244 mm in the first embodiment.

  FIG. 1 is a circuit block diagram of a power supply device built in the induction heating cooker 1. The power supply device according to the present invention generally includes a converter (for example, also referred to as a diode bridge circuit or a rectifier bridge circuit) that converts a three-phase AC power source into a DC current, a smoothing capacitor connected to the output terminal of the converter, and the smoothing capacitor. Main inverter circuit (power circuit section) MIV for the main heating coil MC connected in parallel to the condenser for use, and a sub inverter circuit for each of the sub heating coils SC1 to SC4 connected in parallel to the smoothing condenser. (Power supply circuit unit) SIV1 to SIV4. 210L indicates an inverter circuit composed of the main inverter circuit MIV and four sub inverter circuits SIV, and is for the first induction heating unit 6L. 210R is an inverter circuit of a right induction heating source (second induction heating unit) 6R to be described later, and 210M is a drive circuit of a radiation type central electric heating unit 7 to be described later.

  The main inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 convert the direct current from the converter into a high frequency current, and supply the high frequency current to the main heating coil MC and the sub heating coils SC1 to SC4, respectively, independently of each other. Is.

  In general, the impedance of the induction heating coil changes depending on the presence and size (area) of the object N to be heated placed above the induction heating coil. The amount of current flowing through the inverter circuits SIV1 to SIV4 also changes. The power supply device of the present invention includes a current detection unit (detection means) 280 for detecting the respective current amounts flowing in the main heating coil MC and the sub-heating coils SC1 to SC4. This electric current detection part is a kind of to-be-heated object mounting judgment part mentioned later.

  According to the present invention, the current detection unit 280 is used to detect the amount of current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4, whereby the object to be heated N is placed above each coil. Whether or not the bottom area of the object N to be heated is larger than a predetermined value, and the estimation result is transmitted to the control unit (hereinafter referred to as “energization control circuit”) 200. Can be accurately detected.

  In addition, as what detects the mounting state of the to-be-heated material N, although the electric current detection part 280 which detects the electric current amount which flows into the main inverter circuit MIV and the sub inverter circuits SIV1-SIV4 was used, it is not limited to this Alternatively, the placement state of the object N to be heated may be detected using another arbitrary sensor such as a mechanical sensor or an optical sensor.

  As shown in FIG. 1, the energization control circuit 200 of the power supply device of the present invention is connected to the current detection unit 280, and the main inverter circuit MIV and the sub inverter circuit according to the mounting state of the object N to be heated. A control signal is given to SIV1 to SIV4. That is, the energization control circuit 200 receives a signal regarding the amount of current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4 (data indicating the placement state of the object to be heated N) detected by the current detection unit 280. When it is determined that the heated object N is not placed or the diameter of the heated object N is smaller than a predetermined value (for example, 120 mm), the high-frequency current to the main heating coil MC and the auxiliary heating coils SC1 to SC4 The main inverter circuit MIV and the sub-inverter circuits SIV1 to SIV4 are selectively controlled so that the supply of the main inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 is stopped.

  According to the present invention, the energization control circuit 200 supplies the main heating circuit MC and the auxiliary heating by supplying the main inverter circuit MIV and the auxiliary inverter circuits SIV1 to SIV4 with a control signal corresponding to the placement state of the object N to be heated. Power feeding to the coils SC1 to SC4 can be controlled independently of each other. In addition, the main heating coil MC in the center is not driven (set to the OFF state) and all the sub-heating coils SC1 to SC4 are driven (set to the ON state), so that the pan skin (the side of the pan) It is also possible to realize a cooking method that only heats up.

  The operation means E is provided with a first selection unit E1, a second selection unit E2, and a third selection unit E3, but the cooperative heating operation of the first induction heating source 6L, that is, the main heating coil MC and You may further provide the switch which a user arbitrarily prohibits simultaneous heating with the subheating coil SC. In this way, when a pan with a clearly small diameter is heated by the first induction heating source 6L, the user can select heating by the main heating coil MC alone instead of cooperative heating. That is, by detecting the amount of current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4 by the current detection unit 280, whether or not the object to be heated N is placed above each coil, or It is not necessary for the energization control circuit 200 to estimate and process whether or not the bottom area of the heated object N is larger than a predetermined value.

Next, “heating power” that determines the amount of heating when cooking by the second induction heating unit 6R, the first induction heating unit 6L, and the radiation type central electric heating source 7 will be described. The heating power adjustment range is determined by the energization control circuit 200 as follows, and the user can arbitrarily select a desired heating power from these heating power values by the operation means E.
First induction heating unit 6L: rated maximum heating power 3000 W, rated minimum heating power 150 W.
Thermal power values are 9 levels of 150W, 300W, 500W, 750W, 1000W, 1500W, 2000W, 2500W, 3000W.
Second induction heating unit 6R: rated maximum thermal power 3000W, rated minimum thermal power 150W.
Thermal power values are 9 levels of 150W, 300W, 500W, 750W, 1000W, 1500W, 2000W, 2500W, 3000W.
Radiation type central electric heating source 7: rated maximum thermal power 1500W, rated minimum thermal power 200W.
The firepower value is a total of 14 steps from 200W to 1500W every 100W.

In FIG. 2, (main part A)
As shown in FIG. 2, the main body part A is covered with a top plate part B to be described later, and the main body part A is formed on kitchen furniture (not shown) such as a sink. It is formed in a substantially square shape in accordance with the size and space covering the installation opening.

  The upper part of the main body case 2 formed of a thin metal plate that forms the outline of the main body A is designed in a box shape with inner dimensions of a lateral width W3 of 540 mm (or 550 mm) and a depth DP2 of 402 mm. The first induction heating unit 6L is installed inside the main body case. 6R is a 2nd induction heating part, Comprising: The induction heating coil 6RC wound by the flat disc shape is provided.

  As shown in FIG. 2, the rear end portion, the right end portion, and the left end portion of the upper surface opening of the main body case 2 have flanges formed by integrally bending outwardly in an L shape, The flange 3B, the left flange 3L, the right flange 3R, and the front flange 3F extending horizontally from the front flange plate 2B are placed on the upper surface of the kitchen furniture installation part so as to support the load of the heating cooker. It has become.

  The main body case 2 has two types of width W1 of 75 cm and 60 cm in the standard of the Japanese sink, but in the case of the 75 cm type, the width W1 is designed to be about 750 mm and the depth DP1 is 508 mm to 510 mm.

  A top plate 21 is installed so as to cover the top surface of the main body case 2, and an object to be heated N such as a pan made of metal having magnetism on the top plate (hereinafter sometimes simply referred to as a pan) Is placed and heated by the first induction heating unit 6L and the second induction heating unit 6R installed therebelow. As shown in FIG. 2, the heat-resistant tempered glass plate constituting the top plate 21 has a width W2 of 728 mm and a depth dimension of DP3 which is almost equal to the depth DP2. In FIG. 2, FH1 to FH3 indicate the width of the planar portion remaining around the top plate 21 when the main body case 2 is viewed from above, FH1 and FH2 are about 10 mm, and FH3 is about 50 to 80 mm. . The top plate portion B includes left and right side walls of the main body case 2 on the left and right sides of the top plate 21, in other words, plane portions FH4 and FH5 having a predetermined width from the respective outer surfaces of the left wall 10L and the right wall 10R described later. The width of these flat portions is about 100 mm.

  Reference numeral 7 denotes a radiant central electric heating unit, which is disposed on the left and right center line CL1 of the top plate 21 and at a position near the rear part of the top plate 21. The radiation type central electric heating source 7 uses an electric heater of a type heated by radiation (for example, a nichrome wire, a halogen heater, a radiant heater), and heats an object N to be heated such as a pan through the top plate 21 from below. It is.

  The radiant central electric heating unit 7 has a circular container shape with the entire upper surface opened, and has a maximum outer diameter of about 130 mm and a height (thickness) of 15 mm. The facing interval W12 between the central electric heating unit 7 and the side coil SC3 of the first induction heating unit 6L is about 45 to 50 mm, and the facing interval W11 between the heating coil of the second induction heating unit 6R is 40 to 60 mm. Is set to about.

Inside the main body case 2, a control means F for controlling the cooking conditions of the first and second induction heating sections 6L and 6R and the central electric heating section 7 is incorporated, and the cooking conditions are input to the control means. The operating means E is disposed on the upper surface in front of the main body case 2.
G is a display means for displaying cooking conditions inputted by the operation means, for example, heating power and heating time. The display surface of the display means is formed of, for example, a liquid crystal display screen, and is disposed below the top plate 21 so as to be seen through.

  Although not shown in the inside of the main body case 2, an inverter circuit board that supplies high-frequency power to the first and second induction heating units 6L and 6R, and the first and second induction heating units 6L and 6R. It incorporates a blower for cooling the heating coil that constitutes.

  The heating coil 6RC of the second induction heating unit 6R has a circular outer shape, and its radius R2 is about 90 mm, that is, the outer diameter is about 180 mm. The maximum outer diameter may be changed to 200 mm. The center point X2 of the heating coil 6RC is at the intersection of the straight line CL3 in the front-rear direction and the horizontal straight line CL5 orthogonal thereto. An interval W4 between the center points X1 and X2 is set to an appropriate interval from 300 mm to 350 mm.

  Although the first induction heating unit 6L and the second induction heating unit 6R are adjacent to each other below the top plate 21, the distance W5 between the two is secured to a predetermined size so that they are not adversely affected by induction heating. Has been. The predetermined dimension is desirably at least 80 to 90 mm. This interval W5 is the interval between the outer periphery of the perfect circle PC including the four side coils SC1 to SC4 and having the center point at X1 and the left end face of the heating coil 6RC. Further, since the diameter of the perfect circle PC including the four side coils SC1 to SC4 and having the center point X1 is 244 mm as described above, the radius R3 is about 122 mm.

  Reference numeral 10 denotes a component storage chamber having a rectangular planar shape, and is formed inside the main body case 2 by being surrounded by four surfaces of the front wall 10F, the right wall 10R, the left wall 10L, and the rear wall 10B constituting the main body case 2. ing. The interval between the left and right walls 10R and 10L is W3 as described above, and the depth dimension of the component storage chamber 10 formed by the front wall 10F and the right wall 10R is DP2 as described above.

  In FIG. 4, CW1 indicates the distance between the lateral center points of two side coils facing each other, for example, the side coils SC1 and SC4. In the example of FIG. 4, the dimension CW1 is twice the radius R1 (about 64 mm), twice the gap GP1 (10 mm), twice the coil width (15 mm), and the width W31 (about about 31 mm) of the inner space 272. 18 mm) and a diameter of about 196 mm. The maximum outer diameter DB of the heating coil of the first induction heating unit 6L is a circular diameter including all the sub-heating coils SC unless otherwise specified. In the first embodiment, the maximum outer diameter DB is about 244 mm. This is calculated by adding twice the width W31 (about 18 mm) and the coil width (15 mm) of the inner space 272 to about 196 mm of CW1.

Next, the display unit G will be described.
In this Embodiment 1, since the said display part G is used in common with all the heat sources, it is also called an integrated display means. All heating sources include first and second induction heating units 6L and 6R, a radiant central electric heating unit 7, and further an electric heating means called a grill box (grill heating chamber) or a roaster. Then, the electric heating means is also included. The display screen 100 used in the integrated display means of the first embodiment is a known dot matrix type liquid crystal display screen. In addition, a high-definition screen (QVGA with a resolution of 320 × 240 pixels or 640 × 480 dots, equivalent to VGA capable of displaying 16 colors) can be realized, and a large number of characters can be displayed even when characters are displayed. Can do. The liquid crystal display screen is not limited to a single layer but may be a screen that displays two or more layers in order to increase display information. Further, it may be composed of STN (Super Twisted Nematic) liquid crystal using a simple matrix driving method.

In the first embodiment, the display area of the display screen 100 is a rectangle having a size of about 40 mm (or about 80 mm) in the vertical (front and rear direction) and about 100 mm (or about 120 mm) in the horizontal direction.
In FIG. 2, WX is a space between the display screen 100 and the heating coil 6LC of the first induction heating unit 6L, and indicates a facing distance (shortest distance), which is about 50 mm.

In FIG. 3, reference numeral 215 denotes a display driving circuit of the integrated display means 100. This display unit driving circuit is connected to the energization control circuit 200.
The display unit driving circuit 215 includes a display memory 215A, a display controller 215B, an interface 215C, a power source 215D, a common driver 215E, and a segment driver 215F.

The display unit driving circuit 215 operates with power from the power source 215D, and acquires image information from the built-in memory 10 of the energization control circuit 200 through the interface 215C.
The display memory 215 </ b> A stores the image information acquired from the energization control circuit 20010.
The display controller 215B and the image information stored in the display memory 215A are read, and the common driver 215E and the segment driver 215F are continuously driven based on the image information. The common driver 215E and the segment driver 215F drive the liquid crystal by applying a voltage to mutually intersecting electrodes provided corresponding to each pixel of the display screen 100. In this way, the display drive circuit 215 displays the image information stored in the display memory 215A on the display screen 100 whenever necessary.

  The display unit driving circuit 215 is configured by a dedicated microcomputer different from the microcomputer configuring the energization control circuit 200. In addition, although the display part drive circuit 215 is installed in the vicinity position of the display screen 100, for example, just under the display screen 100, or the position just beside it, the distance with the heating coil 6LC of the 1st induction heating part 6L is said space. It is installed at a position larger than WX.

  The display screen 100 is placed as close as possible to the lower surface of the top plate 21 so that the display screen 100 can be easily seen from above the top plate 21. Further, the main heating coil MC and the side heating coil SC of the first induction heating unit 6L are also installed as close as possible to the lower surface of the top plate 21 in order to make the distance from the object to be heated N as small as possible. Yes. The same applies to the heating coil 6RC of the second induction heating unit 6R. For this reason, the display screen 100 is almost the same height as the side heating coil SC, and is in an adjacent relationship as shown in FIG. In addition, the opposing space | interval of the display screen 100 and the side part heating coil SC1 or SC2 is ensured at least 50 mm or more. Actually, a magnetic shield ring (not shown) is provided so as to surround the main heating coil MC and all the side heating coils SC, so that the distance between the magnetic shield ring and the display screen 100 can be secured to 50 mm or more. I have to. It should be noted that the same distance from the second induction heating unit 6R is secured.

  In FIG. 3, E4 is a heating time setting switch provided in the operation means E, and the energizing time of the heating source can be set by the user operating this switch. E5 is a heating power setting switch of the first and second induction heating units 6L and 6R and the radiation type central electric heating unit 7, and the heating capability (heat amount) of the heating source can be adjusted by the user operating this switch. .

  Next, the specific operation of the characteristic first induction heating unit 6L of the present invention will be described. Before that, it can be executed by the energization control circuit 200 constituting the core of the control means F in the present invention. The main cooking menu will be described.

High-speed heating mode (selected by the first selection unit E1 in the cooking menu giving priority to the heating rate) The heating power to be applied to the heated object N can be set manually.
As described above, the total heating power of the main heating coil MC and the sub heating coil is in a range from 150 W to 3.0 KW, and the user selects one stage from nine stages. The heating power ratio between the main heating coil MC and the auxiliary heating coils SC1 to SC4 (hereinafter, referred to as “main / sub heating power ratio”) is within the range of the predetermined heating power ratio as long as it does not exceed the total heating power selected by the user. Thus, it is automatically determined by the energization control circuit 200 and cannot be arbitrarily set by the user. For example, the main / sub heating power ratio automatically changes from 2: 3 (at the time of large heating power) to 1: 1 (at the time of small heating power).

  The main heating coil MC and the sub-heating coils SC1 to SC4 are driven at the same time. In this case, the directions of the high-frequency currents in the adjacent areas are controlled to coincide.

Fried food mode (automatic) (Cooking menu that requires heating speed and heat retention function, selected by the third selection unit E3) Heats an object to be heated N (such as a tempura pan) containing fried oil to a predetermined temperature ( (First step), and then the energization control circuit 200 automatically adjusts the thermal power (second step) so as to maintain the temperature of the object N to be heated in a predetermined range.
1st process: It heats rapidly to predetermined temperature (for example, 180 degreeC).
Main heating coil thermal power is 2.5kW
2nd process: Deep-fried food is implemented here and tempura ingredients etc. are thrown in. Run for up to 30 minutes. In this step, (arbitrary) thermal power setting by the thermal power setting unit is prohibited. The heating operation ends automatically after 30 minutes (extension command is also possible).
The main / sub heating power ratio is automatically determined to be within a predetermined range in both the first step and the second step, and the user cannot arbitrarily set the heating power ratio between the main heating coil and the sub heating coil. For example, the main / sub heating power ratio automatically changes from 2: 3 (at the time of large heating power) to 1: 1 (at the time of small heating power).

  The main and sub heating coils are driven simultaneously in the first step, and the flow of the high-frequency current of the coils in the adjacent areas is the same. This is because it quickly heats up to a predetermined temperature. Similarly, in the second step, they are simultaneously driven and the current flows are matched. However, if the state where the temperature changes little during the fried food continues, the direction of the current is reversed to achieve uniform heating.

Preheating mode (cooking menu that prioritizes heating uniformity, selected by the second selection unit E2) The first preheating step of heating the object N to be heated with a predetermined heating power while prohibiting setting or changing the heating power After the first preheating step is completed, a heat retaining step for maintaining the object N to be heated in a predetermined temperature range (using a detected temperature signal from the temperature sensor) is performed.
Preheating process:
Main heating coil 1000W (fixed)
Sub heating coil 1500W (fixed)
Thermal insulation process: Up to 5 minutes. If (arbitrary) heating power is not set during this period, the heating operation is automatically terminated after 5 minutes.
Main heating coil 300W-100W (cannot be set by the user)
Sub-heating coil 300W-100W (cannot be set by the user)
When any thermal power setting is made during the heat insulation process, it becomes the same as high-speed heating.
As for the arbitrary thermal power setting, the total thermal power of the main heating coil MC and the auxiliary heating coil is in a range from 150 W to 3000 W as described above, and the user can select one stage from nine stages.
In this case, the main / sub heating power ratio is automatically determined by the energization control circuit 200 so as to be within the range of the predetermined heating power ratio, and cannot be arbitrarily set by the user. For example, the main / sub heating power ratio is from 2: 3 (at the time of large heating) to 1: 1 (at the time of small heating).

The main and auxiliary heating coils are driven simultaneously in the preheating process, and at this time, the flow of the high-frequency current in the adjacent regions is in the opposite direction. This is because it is important to make the heating intensity uniform by interfering with the magnetic flux generated from both heating coils in the adjacent region. The directions of the high-frequency currents in the regions adjacent to each other are also oppositely driven in the heat insulation process. This is to make the entire temperature distribution uniform.
In the heat retaining step and after boiling, convection promotion control is started based on the user's command. This convection promotion control will be described later.

Water heating mode (Cooking menu giving priority to heating speed, selected by the first selection unit E1) The user starts heating the water in the object N with an arbitrary heating power, and the water is boiled (by the temperature sensor, When the energization control circuit 200 is determined to be in a boiling state from information such as the temperature of the article to be heated N and the temperature rise degree change, the display means G notifies the user of that fact. Thereafter, the heating power is automatically set, and the boiling state is maintained for 2 minutes.
Water heating process:
The total heating power of the main heating coil and the sub-heating coil is 150 W to 3000 KW (arbitrary setting from 9 levels from 1 to 9 heating power. The default setting is heating power 7 = 2000 W).
The main / sub heating power ratio is automatically determined by the energization control circuit 200 so as to be within the range of the predetermined heating power ratio as long as it does not exceed the total heating power selected by the user, and can be arbitrarily set by the user. Can not. For example, the main / sub heating power ratio automatically changes from 2: 3 (at the time of large heating power) to 1: 1 (at the time of small heating power).
Thermal insulation process: Maximum 2 minutes. The heating operation ends automatically after 2 minutes.
Main heating coil 1000W or less (cannot be set by the user)
Sub heating coil 1500W or less (cannot be set by the user)
If the user sets any heating power during this period, it is the same as fast heating. The heating power is also in the range of 150W to 3000W, and one can be arbitrarily selected from nine stages.

  Until the boiling, the main heating coil MC and the sub-heating coils SC1 to SC4 are driven simultaneously, and at that time, the directions of the high-frequency currents in the regions adjacent to each other are controlled to coincide. After boiling, the direction of current is reversed.

Rice cooking mode (cooking menu that prioritizes uniformity of heating; selected by the second selection unit E2) The user sets a container to be heated N with an appropriate amount of cooked rice and water, and sets the container to a predetermined It is heated according to a rice cooking program (a series of programs such as a water absorption process, a heating process, a boiling process, and a steaming process), and rice is cooked automatically.
Water absorption process and rice cooking process:
Main heating coil 600W or less (cannot be set by the user. Automatically changes as the process progresses)
Sub-heating coil 700W or less (cannot be set by the user. Automatically changes as the process progresses)
Steaming process: 5 minutes Main heating coil Zero heating (thermal power 0W)
Thermal insulation process: Up to 5 minutes.
Main heating coil 200W or less (cannot be set by the user)
Sub heating coil 200W or less (cannot be set by the user)

  The main and sub heating coils are driven simultaneously, but are controlled so that the flow of high-frequency current in the adjacent areas is in the opposite direction. This is because it is important to make the heating intensity uniform by causing the magnetic fluxes generated from both heating coils to interfere with each other in the adjacent region.

  In addition, after the rice cooking process is completed, when the detection circuit unit (heated object placement detection unit) 280 detects that the object to be heated N is not placed on the main / sub heating coil, or the steaming process or heat retention Similarly, in any of the steps, when the object to be heated is detected by the object-to-be-heated object placement detection unit that the object to be heated N is not placed on the main and auxiliary heating coils at the same time, the main and auxiliary heating coils are heated. Stop immediately.

Boiled mode (Cooking menu giving priority to heating speed, selected with first selection unit E1)
Heating process (until boiling):
The heating power applied to the object to be heated N can be set manually.
The total heating power of the main heating coil MC and the sub heating coil is in a range from 150 W to 3000 W, and the user selects one stage from nine stages.
Default value is 2000W (If the user does not select thermal power, heating starts at 2000W)
The main-sub heating power ratio is automatically determined by the energization control circuit 200 so as to be within a predetermined heating power ratio range, and cannot be arbitrarily set by the user. For example, the main / sub heating power ratio automatically changes from 2: 3 (at the time of large heating power) to 1: 1 (at the time of small heating power).
After boiling:
When the water boils (the control unit estimates that it is in a boiling state from information such as the temperature of the article N to be heated and the temperature rise degree change by the temperature sensor), the user is informed.
Thereafter, the heating operation is automatically continued at a default value (600 W) so as to maintain the boiling state for 30 consecutive minutes (extension is possible), but the user may arbitrarily select the heating power after boiling.

  The main heating coil MC and the sub-heating coils SC1 to SC4 are simultaneously driven over the entire heating process until boiling, and the directions of the high-frequency currents in the regions adjacent to each other are controlled to coincide. After boiling, convection promotion control is started based on the user's operation. This convection promotion control will be described later.

Water heating + heat retention mode (Cooking menu prioritizing heating speed and uniformity, selected with the third selection unit E3)
The user starts heating the water in the heated object N with an arbitrary heating power, and the water is boiled (by the temperature sensor, the control unit estimates the boiling state from information such as the temperature of the heated object N and the temperature rise change). ), The user is informed by the display unit G. Thereafter, the heating power is automatically set, and the boiling state is maintained for 2 minutes.
Water heating process:
The total heating power of the main heating coil and the auxiliary heating coil is 150 W to 3000 W (arbitrary setting from 9 levels from 1 to 9 heating power. The default setting is heating power 7 = 2000 W).
The main / sub heating power ratio is automatically determined by the energization control circuit 200 so as to be within the range of the predetermined heating power ratio as long as it does not exceed the total heating power selected by the user, and can be arbitrarily set by the user. Can not. For example, the main / sub heating power ratio automatically changes from 2: 3 (at the time of large heating power) to 1: 1 (at the time of small heating power).
Thermal insulation process: Up to 10 minutes. The heating operation ends automatically after 10 minutes.
Main heating coil 1000W or less (cannot be set by the user)
Sub heating coil 1500W or less (cannot be set by the user)

  Until boiling, the direction of the high-frequency current in the adjacent region of the main heating coil MC and the sub-heating coils SC1 to SC4 is controlled to coincide. After boiling, the direction of current is reversed. After boiling, convection promotion control is started based on the user's operation. This convection promotion control will be described later.

  Hereinafter, the basic operation of the induction heating cooker according to the present invention will be described with reference to FIG. First, when the main power supply is turned on and the user commands a heating preparation operation with an operation unit (not shown), the amount of current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4 using the current detection unit 280. Is detected to determine whether or not the object to be heated N is placed above each coil, or whether or not the bottom area of the object to be heated N is larger than a predetermined value. Is transmitted to the energization control circuit 200 (step MS1).

If it is a suitable pan, the energization control circuit 200 displays on the operation means E or the display means G installed in the vicinity thereof, for example, on the liquid crystal display screen 100 to prompt the user to select a desired cooking menu ( MS2). Specifically, the display unit driving circuit 215 starts operation with power from the power source 215D, and acquires image information of a predetermined “initial screen” from the built-in memory 10 of the energization control circuit 200 through the interface 215C. Then, the common driver 215E and the segment driver 215F are driven to display the initial screen.
If a deformed pan that does not fit (such as one with a recessed bottom) or an unusually small pan is used, a heating prohibition process is performed (MS6). Also in this case, the display screen 100 displays that the pot is incompatible.

When the user selects and inputs the cooking menu, heating power, cooking time, and the like with the operation unit G, the heating operation is started in earnest (MS4).
The cooking menu displayed on the display means G includes the above-mentioned “high-speed heating mode”, “fried food mode”, “hot water mode”, “preheating mode”, “rice cooking mode”, “boiled mode”, “hot water + warming mode” 7 ”. In the following description, the description of the mode is omitted, and for example, “fast heating mode” may be described as “fast heating”.

  When the user selects any one of these seven cooking menus, the control mode corresponding to these menus is automatically selected by the built-in program of the energization control circuit 200, and the main heating coil MC and sub-heating are selected. Whether each of the coils SC1 to SC4 is energized, the energization amount (thermal power), the energization time, etc. are set. Depending on the cooking menu, a display prompting the user to set an arbitrary heating power, energizing time, etc. is performed on the display unit (MS5).

  The first, second, and third selectors E1, E2, and E3 are a total of three, whereas there are a total of seven cooking menus displayed on the display means G. For example, in E1, there are keys that can select three types of "high-speed heating", "boiling water", and "boiled". Similarly, there are two keys “preheat” and “cooking” in the selection section E2, and two keys “hot water + heat retention” and “fried food” in the selection section E3.

(Convection promotion control)
Next, in the left induction heating source 6L of the present invention, convection promotion control, which is a feature of the heating mode, will be described. There are roughly three types of convection promotion control. It should be noted that the energization control circuit 200 determines that the temperature sensor detects that the temperature of the object N has increased after boiling or just before boiling, for example, up to 98 ° C., or that it is close to the boiling state from the elapsed time from the start of cooking. In some cases, it is desirable that convection promotion control be started immediately after the user's arbitrarily commanded time, for example, immediately after the operation. Unless the user prohibits or stops heating halfway, the convection promotion control may be automatically performed. This convection promotion control will be described later.

(First convection promotion control)
In this control, the object N to be heated is heated by the sub-heating coils SC1 to SC4 during a period in which the main heating coil MC is not driven.

  FIG. 4A shows a state in which high-frequency current is simultaneously supplied from the sub inverter circuits SIV1 to SIV4 to the four sub heating coils SC1 to SC4. Similarly, in FIG. 4B, the high-frequency current is not supplied to the four sub-heating coils SC1 to SC4, and the heating operation is stopped. On the other hand, only the main heating coil MC is supplied with the high-frequency current from the main inverter circuit MIV. And shows a state of being heated and driven. In addition, when hatching is given to the main heating coil MC, the state which is energized is shown. In addition, when the four sub-heating coils SC1 to SC4 are displayed in black, the energized state is shown. However, in the second convection control and the third convection control described later, the energized states of the four sub-heating coils SC1 to SC4 may not be displayed by hatching or coloring.

  (A) of FIG. 5 shows each sub inverter circuit SIV1, with respect to a set (hereinafter also referred to as “group”) of two sub heating coils SC1 and SC3 among the four sub heating coils SC1 to SC4. This shows a state in which high-frequency currents are supplied individually and simultaneously from SIV3. In this case, the heat generating part of the object N to be heated is a belt-like part directly above the two adjacent sub-heating coils SC1 and SC3 and between them. Therefore, the food to be cooked, such as miso soup and stew, contained in the heated object N with the heat generating part as a reference, is heated in a belt-like portion directly above the two sub-heating coils SC1 and SC3 and between them. And an upward flow is generated. Therefore, if this state is continued, as shown by the arrow YC in FIG. 5A, it is possible to generate a long convection toward the opposite side farthest from the sub-heating coils SC1 and SC3. On the opposite side, it becomes a downward flow, and it is easy to generate a reflux that flows laterally through the bottom of the object to be cooked and returns to the auxiliary heating coils SC1 and SC3 again.

  In other words, it is possible to increase the length of a series of paths (also referred to as a circulation path or a convection loop) in which the liquid cooked food that naturally rises as the temperature rises is lowered again.

  RL1 shows the length of the long convection path until the liquid of the to-be-cooked food moves toward the opposite side and turns into a downward flow. The starting point of RL1 is the center point XS of the sub-heating coils SC1 to SC4. Moreover, RL2 shows the length from one subheating coil SC1 to the wall surface of the opposite side, such as a pot which is the to-be-heated object N. As can be seen from FIG. 5A, RL1 and RL2 are the same (RL1 = RL2).

  Next, as shown in FIG. 5B, among the four sub-heating coils SC1 to SC4, the high-frequency current IB is supplied to each of the sub-inverter circuits SIV1 and SIV2 with respect to the two sub-heating coils SC1 and SC2 adjacent to each other. The state where it is supplied individually and simultaneously is shown. The directions of the currents IB flowing through the sub-heating coils SC1 and SC2 are supplied so as to be opposite to each other in adjacent regions. In this case, since the heat generating part of the object N to be heated is a band-like part directly above and between the two adjacent sub-heating coils SC1, SC2, the direction of the generated convection is shown in FIG. As indicated by the arrow YC.

  Similarly, as shown in FIG. 5C, among the four sub-heating coils SC1 to SC4, a high-frequency current IB is simultaneously applied to each sub-inverter circuit for a set of two sub-heating coils SC2 and SC4 adjacent to each other. The state where it is supplied separately from SIV2 and SIV4 is shown. In this case, the heat generating part of the object to be heated N is a band-like part directly above and between the two adjacent sub-heating coils SC2 and SC4, so the direction of the convection generated is shown in FIG. As indicated by the arrow YC, the direction is the opposite of the state shown in FIG.

  As described in the above embodiment, the first convection promotion control is a system in which main heating is performed by a set of two sub heating coils adjacent to each other among the four sub heating coils SC1 to SC4. In other words, among the four sub-heating coils, half or more and less than the total number of sub-heating coils are driven simultaneously. This first convection promotion control is not realized when only four sub-heating coils SC1 to SC4 are used. For example, when six sub-heating coils are used, three or four sub-heating coils are simultaneously used. It only has to be driven. In other words, three or four sub-heating coils are combined into one set and heated by the set unit.

  According to the first convection promotion control, the convection is promoted so as to return from the one side to the opposite side and from the opposite side to the one side over the entire width of the pan. Can induce flow. Even if convection does not occur, the pan is heated by the sub-heating coils SC1 to SC4 on the outer peripheral side of the main heating coil MC. It is also possible to prevent moisture from evaporating and locally burning due to heat concentration.

  The preferable timing for sequentially switching from (A) to (B), (C) in FIG. 5 is not uniform depending on the food to be cooked, but at least after the temperature of the food to be boiled or 100 ° C. just before boiling. Starting from a close state, after that, for example, switching is performed at intervals of 10 to 15 seconds.

  Or when the cooking for 30 minutes is set, it may be started from 5 minutes before cooking is completed and carried out for 5 minutes until the end. Moreover, in order to make dashi juice easy to be absorbed by ingredients such as vegetables and meats, it may be repeated several times, for example, every 30 seconds. Even if the same subheating coil is actually heated with the same heating power, the strength of the convection generated is greatly influenced by the viscosity of the liquid of the cooking object. It is desirable to select the SC4 thermal power, energization interval, order, and the like.

  According to the first convection promotion control, the four sub-heating coils SC1 to SC4 corresponding to the peripheral portion of the object to be heated N (arranged at predetermined intervals on the same circumference) are driven (turned on). Thus, it is possible to realize a cooking method (heating method) in which only the pot skin (the side surface of the pan) such as a frying pan is preheated.

  FIG. 6 is an explanatory diagram showing the timing of the currents flowing through the main heating coil MC and the sub-heating coils SC1 to SC4. The ON state where the high frequency current to be heated is applied is “ON”, and is not applied. The OFF state is displayed as “OFF”.

  In FIG. 6, as indicated by the broken line, the main heating coil MC is not energized, but during the non-energization period, the main heating coil MC is constituted by two or more sub-heating coils adjacent to each other in this example. Induction heating is performed by a set of sub-heating coils.

  As is clear from FIG. 6, in a plurality of sections (hereinafter simply referred to as “sections”) configured at predetermined time intervals, the sub-heating coils SC1 and SC2 are ON in the first section T1, In the next section T2, the sub-heating coil SC1 is turned off, SC2 is kept on, and SC3 is turned on.

  In the next section T3, the sub-heating coil SC1 continues to be OFF and SC2 is OFF. SC3 continues to be ON, and SC4 is newly turned ON. In the next section T4, SC3 is OFF. SC4 continues to be ON, and SC1 is newly turned ON. The sections T1 to T8 shown in this figure may be about 10 to 15 seconds as described above. Thereafter, the current flowing through the sub-heating coils SC1 to SC4 is turned on and off at predetermined intervals in this way.

(Modification example of sub heating coil set)
In this embodiment, the configuration of the sub-heating coil constituting one set is changed for each section (T1, T2, T3, etc.), but may be fixed without being changed. For example, it can be divided into SC1 and SC2 groups and SC3 and SC4 groups. While one set is ON, the other set is OFF. good. Also in the case of changing, the energization order may be changed when the first group to be heated and driven makes a round in the energizing sections T1 to T4 as shown in FIG. For example, the first set in the section T1 is the sub-heating coils SC1 and SC2 as shown in FIG. 5B, and the combination in the section T2 is the sub-heating coil SC2 as shown in FIG. 5C. When it is SC4 and the combination in the section T5 is again the combination of the sub-heating coils SC1 and SC2 as shown in FIG. 5B, the first group that is driven by heating is sequentially shifted clockwise. However, this may be counterclockwise. In that case, the energization section T1 to T4, and further two rotations of T5 to T8, the drive target sub-heating coil is changed clockwise as shown in FIG. You may make it turn around the clock. The speed at which the heated portion is moved by the sub-heating coil, that is, the energization switching interval (the energization sections T1, T2, T3 to T8, etc.) may be changed each time the circulation is repeated. Such a change mode can also be applied to second and third convection promotion control described later.

(Modification of sub-heating coil)
As shown in FIG. 8, the number of the four sub-heating coils SC1 to SC4 may be two. That is, the right side sub-heating coil SCR shown in FIG. 8 is like the two sub-heating coils SC1 and SC2 shown in FIGS. The whole is curved along the whole. The left sub-heating coil SCL has a curved shape so as to be substantially along the entire left outer peripheral edge of the main heating coil MC, and has a bilaterally symmetrical shape with the center point X1 of the main heating coil MC interposed therebetween. .

  The right side sub-heating coil SCR and the left side sub-heating coil SCL are exactly the same, and can be shared by simply changing the orientation. The width of the two sub-heating coils SCR and SCL is about half of the radius of the main heating coil MC. When the main heating coil MC has a diameter of about 180 to 200 mm, the width WA of the sub-heating coils SCR and SCL is , About 30 to 50 mm respectively. There are various technical restrictions, such as how to wind the assembly line, in order to increase the flatness and make it more elongated.

  In this modification, if a high-frequency current is applied alternately to the right sub-heating coil SCR and left sub-heating coil SC from the inverter circuit at predetermined intervals (not necessarily fixed intervals), the object N to be heated has its right outer periphery. Since the part and the left outer peripheral edge are alternately concentrated and heated by induction, convection is created alternately from the left and right in the cooking object. Also in this case, the convection is greater than the heating power of the right subheating coil SCR and the heating power of the left subheating coil SCL at the maximum heating power when the right and left subheating coils SCR and SCL are simultaneously turned on to perform induction heating. It is effective to increase the heating power at the time of heating the right sub-heating coil SCR alone or the heating power at the time of heating the left sub-heating coil SCL alone in the acceleration mode. Note that what is indicated by an arrow IA in the main heating coil MC indicates the direction of the high-frequency current IA flowing through the main heating coil MC when it is driven.

  When the main heating coil MC and either or both of the right sub-heating coil SCR and the left sub-heating coil SCL are simultaneously heated, the high-frequency current IA flowing through the main heating coil MC and the left and right sub-heating coils SCR, SCL The directions of the flowing high-frequency currents IB are preferably the same on the adjacent sides as indicated by solid arrows in FIG. 8 from the viewpoint of heating efficiency (in FIG. 7, the main heating coil MC rotates clockwise, The sub-heating coils SCR and SCL are shown in the counterclockwise case). In this way, when currents flow in the same direction in adjacent regions of two independent coils, the magnetic fluxes generated by the currents strengthen each other and increase the magnetic flux density interlinking the object to be heated N. This is because a large amount of eddy current is generated on the bottom surface of the object to be heated and induction heating can be performed efficiently.

  The heating power in the case of heating one pan at the same time with the right side auxiliary heating coil SCR, the left side auxiliary heating coil SCL, and the main heating coil MC is 3000 W. In this case, the right side auxiliary heating coil SCR is 1000 W, the left side auxiliary heating coil SCR When the heating coil SCL is also heated at 1000 W and the main heating coil MC is also heated at 1000 W, in the convection promotion mode described above, for example, the right side subheating coil SCR is 1500 W and the left side subheating coil SCL is alternately turned on at 1500 W. If only two sub-heating coils are used in this way, the number of inverter circuits to be driven can be reduced, and advantages such as cost reduction due to a reduction in circuit configuration and miniaturization due to a reduction in circuit board area can be expected. .

  As is apparent from the modification of FIG. 8, the first convection promotion control includes a top plate on which a heated object such as a pan into which the object is to be placed is placed, and an annular shape disposed below the top plate. A main heating coil MC; a flat first sub-heating coil SCR and a second sub-heating coil SCL, which are arranged close to both sides of the main heating coil and have a width smaller than the radius of the main heating coil; An inverter circuit that supplies induction heating power to the heating coil MC and the first and second sub-heating coils SCR and SCL, an energization control circuit 200 that controls the output of the inverter circuit, and the control circuit 200 that starts heating An operation unit E for instructing the setting of thermal power, etc., and the energization control circuit 200 provides a period during which no induction heating power is supplied to the first sub-heating coil. An induction heating power is supplied from the inverter circuit to the second sub-heating coil, and thereafter, the induction heating power supply to the second sub-heating coil is stopped. During this period, the first sub-heating coil is supplied to the first sub-heating coil. The induction heating power is supplied from the inverter circuit, and the control unit includes one that repeats the energization switching operation for the first and second sub-heating coils a plurality of times.

  As described above, according to the first embodiment, the display means E for displaying the heating conditions includes the selection keys E1, E2, and E3 of the first, second, and third selection units. The target cooking menu can be easily selected because it is installed in a state where selection operation is possible. A suitable heating drive pattern is automatically determined by the control by the selection, so that cooking can be performed with the heating coil driving mode according to the user's purpose and desire such as emphasizing heating time and temperature uniformity. . As described above, the cooking menu selection key can be operated on the display unit, so that there is an advantage that the misuse of the user can be eliminated and the mental burden can be reduced.

  As an application of this modification, when the energization of the main heating coil MC in the center and the energization timing of the right subheating coil SCR and the left subheating coil SCL are alternated, another convection path can be generated. For example, first, the right side auxiliary heating coil SCR is driven with a heating power of 1 KW for 15 seconds, and then the left side auxiliary heating coil SCL is driven with a heating power of 1 KW for 15 seconds. After repeating this twice, only the main heating coil MC is set to 1 KW. Drive for 15 seconds. By doing so, it is possible to create a convection that rises from directly above the main heating coil MC and then spreads radially on the outer peripheral side of the pan. As a result, two types of convection are formed in combination with convection with a long path by heating from the outer periphery of the pan bottom by the left and right subheating coils SCR, SCL, You can expect effects such as spilling suppression.

(Second convection promotion control)
In this control, while the main heating coil MC is not driven, the object to be heated N is heated by a set (also referred to as a group) of a plurality of adjacent sub heating coils among the sub heating coils SC1 to SC4. A difference is made in the driving power between the sets of sub-heating coils. In other words, power larger than the induction heating power supplied to the first set of sub-heating coil groups is supplied to the second set of sub-heating coil groups, and then supplied to the first set of sub-heating coil groups. The heating power is reduced, and a power larger than this power is supplied to the second set of sub-heating coil groups, and these operations are repeated a plurality of times. In other words, among the four sub-heating coils, a group consisting of more than half and less than the total number of sub-heating coils is driven at the same time. The sum of the thermal power of the group consisting of half or more and less than the total number of sub-heating coils is made larger than that of the remaining sub-heating coils alone or that group.

This will be specifically described below.
As shown in FIG. 5B, among the four sub-heating coils SC1 to SC4, a high-frequency current is simultaneously supplied from two sub-inverter circuits SIV1 and SIV2 to two adjacent sub-heating coils SC1 and SC2. In this case, a heating power (second heating power) of 1.0 kW is set for each of the two sub-heating coils SC1 and SC2. In this case, each of the two sub-heating coils SC4 and SC3 located symmetrically with respect to the two sub-heating coils SC1 and SC2 and the center point X1 is driven with a heating power of 500 W (first heating power).

  Next, as shown in FIG. 5C, among the two sub-heating coils SC1 and SC2, the heating power of SC1 is halved to 500 W (first heating power), and SC2 maintains the heating power as it is. In this state, the sub-heating coil SC4 adjacent to SC2 is driven at 1000 W (second heating power). SC3 remains at 500 W (first heating power).

  Next, as shown in FIG. 5D, among the two sub-heating coils SC2 and SC4, the heating power of SC2 is halved to 500 W, and SC4 is maintained in the state where the heating power is maintained. And the adjacent sub-heating coil SC3 is driven at 1000W. SC1 remains at 500W.

  As is apparent from the above description, the two adjacent sub-heating coil groups are driven with a large heating power, and the remaining two sub-heating coil groups are driven with a smaller heating power. It is characterized in that the portion that is strongly heated is changed in position by switching.

  According to this control, it is also possible to realize a cooking method and a heating method in which the pot skin (side surface of the pan) is effectively preheated while heating the central portion of a frying pan or the like. Moreover, since the center part heated by subheating coils SC1-SC4 changes in the circumference | surroundings of the main heating coil MC, it can also suppress that it is scorched locally especially at the time of heating of the thick viscous cooking liquid. .

  As described above, the second convection promotion control is a system in which main heating is performed by a set of two adjacent sub-heating coils among the four sub-heating coils SC1 to SC4. In other words, among the four sub-heating coils, half or more and less than the total number of sub-heating coils are driven at the same time, and a difference in driving thermal power is set between the remaining one or a plurality of sub-heating coil sets. It is. This second convection promotion control is not realized when only four sub-heating coils SC1 to SC4 are used. For example, when six sub-heating coils are used, three or four sub-heating coils are simultaneously used. It only has to be driven. The second thermal power is preferably at least twice that of the first thermal power, but may be 1.5 times or more. Further, in a system in which four or more sub-heating coils are driven by being divided into a first set of two adjacent sub-heating coils and another set (second set), the second of the first set of sub-heating coils is driven. The total sum of thermal power is desirably twice or more of the second total thermal power, but may be 1.5 times or more.

  Moreover, as shown in FIG. 8 as a modification of the sub-heating coil, the four sub-heating coils SC1 to SC4 are described as two, but the modification can be applied to the second convection promotion control. . That is, a top plate 21 on which an object to be heated such as a pan for putting a food is placed, an annular main heating coil MC disposed below the top plate, and both sides of the main heating coil are disposed close to each other. Inducted into the flat first sub-heating coil SCR and second sub-heating coil SCL having a width smaller than the radius of the main heating coil, and the main heating coil MC and first and second sub-heating coils SCR, SCL, respectively. An inverter circuit for supplying heating power; an energization control circuit 200 for controlling the output of the inverter circuit; and an operation unit E for instructing the energization control circuit to start heating or set a heating power. The circuit 200 generates power larger than the induction heating power supplied from the inverter circuit to the first sub-heating coil SCR. And then reducing the induction heating power supplied to the second sub-heating carp SCL, supplying power greater than this power from the inverter circuit to the first sub-heating coil SCR, The energization control circuit 200 can be realized by a configuration in which the energization switching operation for the first and second sub-heating coils SCR and SCL is repeated a plurality of times.

(Third convection promotion control)
In this control, while the main heating coil MC is being driven, the object to be heated N is heated by the sub-heating coils SC1 to SC4 simultaneously with the driving period or during a period when the driving is stopped. That is, a plurality of flat sub-heating coils disposed on both sides of the main heating coil and having a width smaller than the radius of the main heating coil are divided into a first set and a second set, and these sets are divided into main sets. Arranged on both sides of the heating coil respectively, the induction heating power to the first set is stopped during the period when the induction heating power is continuously or intermittently supplied to the main heating coil with the first heating power. In this state, a second heating power larger than the first heating power is supplied from the inverter circuit to the second set, and then the induction heating power to the first set is stopped, and the second set A third heating power larger than the first heating power is supplied to the set from the inverter circuit, and convection of a long path is generated in the cooking object in the heating object by repeating these operations a plurality of times. It is what. Even when convection does not occur, the pan is heated by the sub-heating coils SC1 to SC4, and the central part changes outside the main heating coil. It can also be suppressed from scorching.

  FIG. 9 is a diagram showing the timing of the current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4. The ON state where the high frequency current to be heated is applied is “ON”, and the OFF state is not applied. The state is displayed as “OFF”.

As shown by a broken line in FIG. 9, the main heating coil MC is continuously energized from the first section T1 to T4, but the next four sections are non-energized periods. During the energization and non-energization periods, induction heating is performed by a set of sub-heating coils that are more than half and less than all (two in this example). The sum of the thermal powers during the induction heating is characterized in that the thermal power is larger than the thermal power of the main heating coil (first thermal power) during “driving for non-convection promotion control”.
Here, “when driving for non-convection promoting control” refers to each of the following two cases. However, when the control is performed, the first thermal power may be set in either one of the cases without determining the first thermal power under a condition that satisfies both of the following two cases.
(1) When the main heating coil MC and all the sub-heating coils are driven at the same time, and cooking is performed in a normal operation in which the maximum heating amount is exhibited. For example, when the main heating coil MC and all the sub-heating coils are driven simultaneously, the maximum heating power setting is 3 KW, and the heating power ratio allocated to the main heating coil at the time of 3 KW heating is 1 KW, It becomes the heating power of the main heating coil at the time of driving for acceleration control.
(2) When the main heating coil MC is cooked by being normally heated by itself, when operating with the largest heating power setting. For example, when the maximum heating power of the main heating coil MC alone is 1.2 kW, this 1.2 kW becomes the heating power of the main heating coil “during driving for non-convection promotion control”.

  As is clear from FIG. 9, over all the sections, the sub-heating coil sets (first set) that are more than half and less than the total number are composed of the sub-heating coils SC1 and SC2, and the second set is It consists of two people, SC3 and SC4. In the first section T1, the first set is ON and the second set is OFF. In the next section T2, the first set is turned off and the second set is turned on.

  In the next section T3, the first set is turned on again and the second set is turned off. The sections T1 to T4 shown in this figure may be about 10 to 15 seconds, for example. Thereafter, the currents flowing through the sub-heating coil groups of the first group and the second group are alternately turned on and off at predetermined intervals in this way.

(Modification of third convection promotion control)
FIG. 10 is a diagram illustrating the timing of the current flowing through the main heating coil MC and the sub-heating coils SC1 to SC4. The state is displayed as “OFF”. The sub-heating coils constitute a group of sub-heating coils (first group) with more than half and less than the total number, and are composed of the sub-heating coils SC1 and SC2. On the other hand, the second group is composed of the remaining SC3 and SC4. The configuration of this set is not changed during cooking, and the first set is always fixed to be two of the sub-heating coils SC1 and SC2.

As shown by the broken line in FIG. 10, the main heating coil MC is energized continuously (by the first heating power) until the first section T1 to T2, but the next four sections (T3 to T6) are not energized. It becomes the energization period. During the induction heating period (with the first heating power) of the main heating coil MC in the first two sections, all of the four sub-heating coils SC1 to SC4 are stopped.
Next, when it becomes section T3, energization of main heating coil MC stops. If this section T3 is entered instead, the first set of sub-heating coils is induction-heated. The sum total of the heating power during the induction heating is a second heating power (for example, 1500 W or 2000 W) larger than the first heating power (for example, 1000 W) of the main heating coil. The second set of sub-heating coils is not heated.

  Next, in the section T4, the energization of the main heating coil MC remains stopped, but in this section T4, the first set of sub-heating coils is heated and stopped. Instead, the second set of sub-heating coils SC3 and SC4 is heated. The sum total of the heating power during the induction heating is a third heating power (for example, 1500 W or 2000 W) that is larger than the first heating power (1000 W) of the main heating coil. The third thermal power and the second thermal power are the same thermal power, but may not be the same as long as they are larger than the first thermal power (1000 W).

  Next, in the section T5, the energization of the main heating coil MC remains stopped, but in this section T5, the first set of sub-heating coils is heated again. In this case, the sum of the driving heating powers of the two sub-heating coils SC1 and SC2 is the second heating power (for example, 1500 W or 2000 W) larger than the first heating power. In this section V, the second set of sub-heating coils SC3 and SC4 is suspended from heating.

  Next, in the section T6, the energization of the main heating coil MC remains stopped, but in this section T6, the first set of the sub-heating coils is stopped again, and the second set is heated instead. . In this case, the sum total of the driving thermal powers of the second sub-heating coils SC3 and SC4 of the second set is a third thermal power larger than the first thermal power.

  Next, when it becomes section T7, the energization of the main heating coil MC is resumed. The thermal power at that time is the first thermal power. In this section T7, the first set of sub-heating coils is again driven by heating. In this case, the sum of the drive heating powers of the two sub-heating coils SC1 and SC2 of the first set is larger than the first heating power. It is. The second set heats off.

  Next, in section T8, the energization of the main heating coil MC is maintained at the heating power 1, but the first set of SC1 and SC2 of the sub-heating coil is stopped. Instead, the second set of sub-heating coils is again heated and the thermal power level in this case is the third thermal power.

  As described above, the main heating coil MC is heated and driven in two sections, and the heating is stopped in four sections. This is repeated thereafter. On the other hand, the first and second sets of sub-heating coils have a pattern in which heating is paused in four sections and then heating is driven alternately in each section. In FIG. 10, (A), (B) in the section T3, (C) in the section T4, (D) in the section T7 are labeled (A), (B), (C). ) And (D) correspond to (A), (B), (C), and (D) in FIG. 11, and it is easily understood from FIG. 11 that the driving timing is sequentially switched. In this way, there are a total of five energization patterns.

  In addition, although the preferable timing of switching of energization, ie, each section (T1-T9 etc.) is not uniform by a to-be-cooked object, it is from the state near 100 degreeC at least after the temperature of a to-be-cooked object boils or just before boiling. After that, switching is performed at intervals of, for example, 10 to 15 seconds. Or when the cooking for 30 minutes is set, it may be started from 5 minutes before cooking is completed and carried out for 5 minutes until the end.

  Even if the main heating coil MC and the sub-heating coil are actually heated by the first and second heating powers, the difference between the first, second, and third heating powers and the absolute values of the first, second, and third heating powers The strength of the convection generated by the value is greatly influenced by the viscosity of the liquid of the object to be cooked, so it is desirable to select the heating power value, the energization interval, the order, etc. from various cooking experiment results.

Hereinafter, a specific example when applied to an actual cooking menu will be described.
For example, a case where a cooking menu “boiled” at 2000 W is performed will be described. First, since the default value is 2000 W as described above even if the first 2000 W is not input at the thermal power setting unit (not shown), heating is started at 2000 W from the beginning. In this case, the main / sub heating power ratio is automatically determined by the energization control circuit 200 and may not be arbitrarily set by the user. For example, the main heating coil MC has a heating power of 800 W, and the total heating power of the four sub heating coils is It is set to 1200 W (larger than the “first thermal power”).

  The energization control circuit 200 issues a notification signal when the water is heated at 2000 W and the water boils (by the temperature sensor, the control unit is estimated to be in a boiling state from information such as the temperature of the article N to be heated and the temperature rise change). Then, the display means G that displays the operating conditions of the heating means is displayed with letters or light, and the user is informed accordingly. At this time, if the heating power is not set again, a notification that the heating power is automatically lowered is given.

  When the user does not perform any operation, the energization control circuit 200 outputs a command signal to lower the heating power to the main inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 when the boiling state is reached. For example, the heating power of the main heating coil MC is 300 W, The total heating power of the four sub-heating coils is set to 300W.

  This state continues for a maximum of 30 minutes, and if no operation is performed during that time, all induction heating sources are automatically stopped. In the process up to this boiling, the direction of the high-frequency current in the adjacent region of the main heating coil MC and the sub-heating coils SC1 to SC4 is controlled to coincide.

  On the other hand, when the user sets the heating power again after boiling, the third convection promotion control is automatically performed. For example, when the user raises the heating power to 2000 W instead of keeping the default value (600 W) after boiling, the energization control circuit 200 sets the heating power (first heating power) of the main heating coil MC to 500 W (first heating power). The total thermal power of two sub-heating coils adjacent to each other is set to 1500 W, and the total thermal power (third thermal power) of another set of sub-heating coils is set to 1500 W.

  During the period in which the main heating coil MC is continuously driven at 500 W, the four adjacent sub-heating coils are divided into, for example, two sets of SC1 and SC2, and two sets of SC3 and SC4. Are alternately heated at a rate of 1500 W each for 15 seconds (one sub-heating coil is supplied with 750 W of thermal power).

  When the user raises the heating power to 3000 W, which is the maximum heating power, immediately after boiling, the energization control circuit 200 sets the heating power (first heating power) of the main heating coil MC to 1000 W (first heating power), The total heating power of two sub-heating coils adjacent to each other is set to 2000 W, and the caliber heating power (third heating power) of another sub-heating coil set is set to 2000 W.

  Until the boiling step, the directions of the high-frequency currents in the adjacent regions of the main heating coil MC and the sub-heating coils SC1 to SC4 are controlled to be strong, and the current direction is opposite after boiling. For example, in the adjacent region between the main heating coil MC and the sub-heating coil SC1 and the adjacent region between the main heating coil MC and the sub-heating coil SC2, the high-frequency current flows in the opposite direction.

  In the above description, when the heating power after boiling is 2000 W, the main heating coil MC is intermittently driven at 500 W, but it may be driven continuously. In any case, more convection is generated by at least two adjacent sub-heating coils. That is, since the two sets of sub-heating coils are alternately induction-heated as close as possible to the peripheral edge of the object N, the specific gravity is reduced at the outer peripheral edge of the object to be cooked, A rising flow is created. The present invention is not limited to the examples of the heating power of the main heating coil MC and the total heating power on the auxiliary heating coil side as described above.

  Further, in order to increase the convection promoting effect, it is desirable that the heating at the outer peripheral edge of the object N to be heated is stronger than the center, so that the main heating coil MC has 1500 W as the first heating power and the sub-heating coil SC1. Even when the total number of adjacent sub-heating coils in SC4 is set to 1.5 KW (as the second heating power), the main heating coil MC is always controlled in the energization rate, for example, the energization rate in the time after boiling If it is set to 50%, the heating power is substantially equivalent to 750 W, so that the convection promoting effect of the present invention can be obtained even with such a thermal power.

  The “time-selective” energization switching control of the sub-heating coils SC1 to SC4 as shown in FIG. 5 also suppresses the spilling when the food is boiled or boiled. That is, when the cooking menu prioritizes heating speed and uniformity as in the above-mentioned “boiling water + heat-retaining mode”, the sub-coil coils SC1 to SC4 as shown in FIG. If the energization switching control is performed, it is possible to avoid a state in which only the center or a specific place of the pan is heated strongly, and the induction heating unit with respect to the bottom of the pan is sequentially moved.

  While the energized sub-heating coil part heats the pan, while the non-energized sub-heating coil part at a location away from the pan does not heat, the heat from the heating part is transmitted through the pan and preheated. These can be expected to have the effect of spreading heat evenly over the entire non-cooked food inside the pan. Here, the meaning of “time selective” is not only a certain period (for example, every 30 seconds). This means that the first and the next switching cycle may be changed in the same cooking menu, or the cycle and the number of repetitions may be changed depending on the type of cooking menu or the object to be cooked.

  As described above, the third convection promotion control is a method in which the peripheral portion is heated by a set of two sub-heating coils adjacent to each other among the four sub-heating coils SC1 to SC4 while the central portion is heated by the main heating coil. It is. In other words, among the four sub-heating coils, half or more and less than the total number of sub-heating coils are driven at the same time, and a difference in driving thermal power is set between the remaining one or a plurality of sub-heating coil sets. It is. This second convection promotion control is not realized when only four sub-heating coils SC1 to SC4 are used. For example, when six sub-heating coils are used, three or four sub-heating coils are simultaneously used. It only has to be driven.

(Modification example of sub heating coil set)
In this embodiment, the sub-heating coil constituting the sub-heating coil group is fixed through all the sections (T1, T2, T3, etc.), and divided into the SC1, SC2 group and the SC3, SC4 group. However, this may be changed at predetermined time intervals. For example, as shown in FIG. 6, it may be changed for each section.

  In addition, as a modification of the sub-heating coil, the first convection promotion control is shown in which the four sub-heating coils SC1 to SC4 are integrated into two pieces (see FIG. 8). 3 can be applied to the convection promotion control.

  That is, the third convection promotion control using the first and second sub-heating coils SCR and SCL includes a heated object N such as a pan in which the object is to be cooked and a top plate on which the heated object is placed. 21, an annular main heating coil MC disposed below the top plate, and a flat-shaped first heating coil disposed adjacent to one side of the main heating coil and having a lateral width smaller than the radius of the main heating coil. The sub-heating coil SCR and the second sub-heating coil SCL, the inverter circuit for supplying induction heating power to the main heating coil MC and the first and second sub-heating coils SCR, SCL, respectively, and the output of the inverter circuit are controlled. An energization control circuit 200; and an operation unit E that instructs the energization control circuit 200 to start heating, set a heating power, and the like. The energization control circuit 200 includes the main heating control circuit 200. During the period when the induction heating power is supplied to the first MC with a first heating power (for example, 800 W), the first subheating coil SCR is supplied with a second heating power (for example, 1) larger than the first heating power from the inverter circuit. .2 KW), and then the induction heating power to the first sub-heating coil SCR is stopped, and the second sub-heating coil SCL is supplied with the third heating power larger than the first heating power from the inverter circuit. Inductive heating power is supplied with thermal power (for example, 1200 W), and the control unit can realize the configuration in which the energization switching operation for the first and second sub-heating coils SCR and SCL is repeated a plurality of times.

  Further, in the period in which the main heating coil MC and the right side subheating coil SCR or the left side subheating coil SCL are simultaneously heated, the high frequency current IA flowing through the main heating coil MC and the left and right subheating coils SCR, SCL are respectively As described above, it is preferable from the viewpoint of heating efficiency that the direction of the flowing high-frequency current IB is the same in the adjacent side as shown by the solid arrow in FIG. Therefore, in the convection promotion mode, if the currents are controlled to flow in the same direction in the adjacent regions of the two independent coils, the magnetic fluxes generated by the currents strengthen each other, and the object N to be heated is Since the interlinkage magnetic flux density is increased and a large amount of eddy current is generated on the bottom surface of the object to be heated and induction heating can be efficiently performed, heating for generating convection can be effectively performed.

Next, the influence of the leakage magnetic flux from the first induction heating unit 6L on the display screen 100 of the integrated display means G will be described.
As shown in FIG. 12, when a current IB is passed through each of the sub-inverter circuits SIV1 and SIV2 through two sub-heating coils SC1 and SC2 out of the four sub-heating coils SC1 to SC4, the direction of the currents Is effective in the object N to be heated in the same direction at the opposite ends of the sub-heating coils SC1 and SC2, that is, toward the main heating coil MC, and directly above the space 273 between the sub-heating coils SC1 and SC2. Magnetic flux is interlinked. That is, the heating effect is enhanced. On the other hand, the direction of the magnetic field generated from the sub-heating coil SC1 on the right side is upward from below, whereas the direction of the magnetic field generated from the sub-heating coil SC2 on the left side is downward from above. Both these magnetic fields cancel each other, so that both magnetic fields become smaller. For this reason, as indicated by an arrow Z in FIG. 12, the leaked magnetic field is reduced in the divergent region ZT as indicated by the oblique lines. Therefore, it is possible to suppress adverse effects caused by the fluctuation of the magnetic field on the display screen 100 of the integrated display means G at the tip of the extension line of the arrow Z, the display memory 215A of the display unit driving circuit 215, and the like. In order to reduce the adverse effect of the magnetic field from the sub-heating coil SC1 or SC2, it may be considered that the display screen 100 of the integrated display means G and the display drive circuit 215 are physically separated from the first induction heating unit 6L. However, in this case, when operating the first induction heating unit 6L, it is necessary to move the line of sight largely when checking the display screen, which is undesirable because it impairs the visibility of the user.

  In addition, although the direction of the electric current of four subheating coils SC1-SC4 is not necessarily the same in the adjacent area | region of two adjacent subheating coils as shown in FIG. 12 in all the cooking menus, it is at least 2 adjacent. When the two sub-heating coils are driven simultaneously with a large heating power, if the current direction is controlled to be the same in the adjacent region as shown in FIG. Etc. can be prevented. Further, when the direction of the high-frequency current supplied to the sub-heating coil SC1 is opposite to the example shown in FIG. 12, the phase becomes the same as that of the adjacent sub-heating coil SC2 and counterclockwise. Since the leakage magnetic field in the divergent region ZT as shown by the hatched line in FIG. 12 does not change greatly, the display screen 100, the display memory 215A of the display unit driving circuit 215, etc. may be damaged due to the adverse effect of the leakage magnetic field. We can expect to avoid the situation.

  As described above, the induction heating cooker according to the first embodiment is arranged in the component chamber (component storage chamber) 10 inside the main body A whose top surface is covered with the top plate 21 and in this component chamber. An induction heating unit 6L, a display unit G, inverter circuits MIV and SIV for supplying a high-frequency current to the induction heating unit 6L, and an energization control circuit 200 for controlling the inverter circuit and the display unit G. The induction heating unit 6L includes an annular main heating coil MC in the center and a plurality of side heating coils SC that are arranged close to the periphery and maintain a predetermined space 273. Drives the inverter circuits MIV and SIV to enable independent heating of the main heating coil MC and cooperative heating of the main heating coil MC and the side heating coil SC, respectively. Across a space 273 between the heat coil SC mutual it is obtained by placing the display screen 100 of the display unit G in the direction opposite to the main heating coil MC. Thereby, the single heating of the main heating coil MC and the cooperative heating of the main heating coil MC and the side coil SC can be performed on the top plate 21 having a limited area. It can cope with a circular shape and the like, and the usability is improved, and the display unit 100 can be protected from the influence of magnetic flux leaking from between two adjacent side heating coils SC1 and SC2, and a stable display operation is expected. can do.

  Moreover, the induction heating cooking appliance which concerns on Embodiment 1 has comprised the structure which concerns on 2nd invention. That is, the component chamber (component storage chamber) 10 in the main body portion A whose top surface is covered with the top plate, the first induction heating unit 6L disposed in the component chamber, and left and right, 2 induction heating units 6R, and a straight line BL connecting the center points X1 and X2 of the first induction heating unit 6L and the second induction heating unit 6R, and the center points X1 and X2 A high-frequency current is supplied to the display screen 100 of the display unit G and the first and second induction heating units 6L and 6R which are located between the front and rear straight lines CL2 and CL3 passing through An inverter circuit MIV, SIV, 210R, and an energization control circuit 200 for controlling the inverter circuit and the display screen. The first induction heating unit 6L includes an annular main heating coil MC in the center, Place close to this circumference A plurality of side heating coils SC each maintaining a predetermined space 273, the second induction heating unit 6R includes an annular heating coil 6RC, and the energization control circuit 200 includes the inverter circuit. The main heating coil MC is individually driven, and the main heating coil MC and the side heating coil SC can be cooperatively heated, and the main heating coil SC is sandwiched between the side heating coils SC. The display screen 100 is arranged in the direction opposite to the coil MC. Thus, the first and second induction heating units 6L and 6R can be individually cooked on the limited top plate 21, and the first induction heating unit 6L has a single main heating coil MC. Heating and cooperative heating of the main heating coil MC and the side coil SC can be performed, and it is possible to handle not only a normal circular pan but also a non-circular shape. The display screen 100 can be protected from the influence of magnetic flux leaking between the coils SC1 and SC2, and a stable display operation can be expected.

  Furthermore, the induction heating cooker according to the first embodiment is smaller than the diameter DB (244 mm) of the circle PC including the side coil SC in the second induction heating source 6R, and the outer diameter of the central coil MC ( A circular coil 6RC having a diameter larger than twice R1 (about 128 mm) (twice R2; about 180 mm or 200 mm), and the first induction heating source 6L includes induction heating by a central coil MC alone. The central coil MC and the side coils SC <b> 1 to SC <b> 4 can be switched automatically or manually according to the size of the object N to be heated. Thus, on the top plate 21 with a limited area, three heating means are provided: single heating of the central coil MC, cooperative heating of the central coil MC and the side coils SC1 to SC4, and single heating of the second induction heating source 6R. Can be selected, and it can correspond to a heated portion having a wider size (diameter) than a conventional two-mouth type cooker having only two types of circular heating coils, and usability can be improved. For example, for a pan having three sizes: a diameter of 130 mm for the central coil MC alone, a diameter of 250 mm for the cooperative heating of the central coil MC and the side coils SC1 to SC4, and a diameter of 200 mm for the second induction heating source 6R alone. It is possible to cope with a heated object having a wider size (diameter) than a conventional two-mouth type cooker having only two types of circular heating coils, and usability can be improved.

Embodiment 2. FIG.
13-40 shows the induction heating cooking appliance which concerns on Embodiment 2 of this invention.
FIG. 13 is a partially exploded perspective view showing the entire induction heating cooker according to Embodiment 2 of the present invention. FIG. 14 is a perspective view showing the entire main body with the top plate of the induction heating cooker according to Embodiment 2 of the present invention removed. FIG. 15 is a plan view of the entire main body of the induction heating cooker according to the second embodiment of the present invention. FIG. 16 is an exploded perspective view in a state where main components such as the upper and lower partition plates of the induction heating cooker according to the second embodiment of the present invention are removed. 17 is a vertical sectional view taken along line D1-D1 of FIG. 18 is a vertical sectional view taken along line D2-D2 of FIG. FIG. 19 is a fragmentary perspective view showing a part of the component case and the cooling duct of the induction heating cooker according to Embodiment 2 of the present invention. FIG. 20 is a plan view for explaining the arrangement of the heating coils of the induction heating cooker according to the second embodiment of the present invention. FIG. 21 is a plan view showing a first induction heating source in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 22 is an explanatory diagram of the wiring of the main heating coil of the first induction heating source in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 23 is an enlarged partial plan view showing the first induction heating source in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 24 is a plan view of the coil support of the first induction heating source in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 25 is an overall control circuit diagram of the induction heating cooker according to the second embodiment of the present invention. FIG. 26 is a full bridge system circuit diagram which is the main part of the control circuit of the induction heating cooker according to the second embodiment of the present invention. FIG. 27 is a simplified diagram of a full-bridge circuit serving as a main part of the control circuit of the induction heating cooker according to the second embodiment of the present invention. FIG. 28 is a longitudinal cross-sectional view of the induction heating cooker according to Embodiment 2 of the present invention when a large-diameter pan is placed above the first induction heating source and heating is performed. FIG. 29 is a longitudinal sectional view showing a first induction heating source portion in the induction cooking device according to Embodiment 2 of the present invention. FIG. 30 is a plan view showing the integrated display means of the induction heating cooker and its peripheral part according to Embodiment 2 of the present invention. FIG. 31 is a block diagram showing the configuration of the display unit of the induction heating cooker body according to Embodiment 2 of the present invention. FIG. 32 is a plan view showing a display screen example of the integrated display means when only the first induction heating source is used in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 33 is a plan view showing a display screen example of the integrated display means when only the first induction heating source is used in the induction heating cooker according to Embodiment 2 of the present invention. FIG. 34 is a plan view showing a display screen example of the integrated display means when high-speed cooking is performed with the first induction heating source in the induction cooking device according to Embodiment 2 of the present invention. FIG. 35 is an explanatory diagram of control steps showing the basic heating operation of the entire induction heating cooker according to the second embodiment of the present invention. FIG. 36 is a flowchart 1 of the control operation of the induction heating cooker according to the second embodiment of the present invention. FIG. 37 is a flowchart 2 of the control operation of the induction heating cooker according to the second embodiment of the present invention. FIG. 38 is a flowchart 3 showing a control operation when the heating power of the induction heating cooker according to the second embodiment of the present invention is changed. FIG. 39 is an induction heating cooker according to Embodiment 2 of the present invention, and shows the values of the main heating coil and sub heating coil heating power values (heating power) when the heating power is 3000 W and 1500 W. FIG. 40 is an induction heating cooker according to Embodiment 2 of the present invention and is a diagram illustrating values of the main heating coil MC and the sub heating coil heating power value (heating power) when the heating power is 500 W. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the structure of the said Embodiment 1, or an equivalent part. Unless otherwise specified, the terms used in Embodiment 1 are also used in the same meaning in Embodiment 2.

(Heat cooker body)
The heating cooker according to the second embodiment also has a rectangular main body A, a top plate B that forms the upper surface of the main body A, and a casing that forms the periphery (outside) other than the upper surface of the main body A. Part C, heating means D for heating pans, foods, etc. with electrical energy, etc., operating means E operated by the user, control means F for controlling the heating means in response to a signal from the operating means, Display means G for displaying the operating conditions of the heating means are provided. Further, as described below, as a part of the heating means D, an electric heating means called a grill box (grill heating chamber) or a roaster is provided.

The feature of the induction heating cooker in the second embodiment is that a normal-sized pan or the like is heated by a conventional main heating coil MC, and a round pan or a large rectangular shape having a diameter much larger than that of a normal pan. When a pan (also referred to as a large-diameter pan) is placed on the induction heating unit, the sub-heating coils SC1 to SC4 and the main heating that are close to the placed position (a plurality of sub-heating coils provided around the main heating coil MC) Cooperative heating is performed in cooperation with the coil, and the top plate corresponds to the outer position of the subheating coil SC so that the subheating coil SC that is performing the cooperative heating operation can be identified. Only the individual light emitting portions below the light are turned on and turned on.
Moreover, the point which has arrange | positioned the wide area | region issuing part which shows the boundary of the wide heating area to the lower part of a top plate so that the wide heating part which enables the cooperative heating of main heating coil MC and all the subheating coils SC1-SC4 is enclosed. This is significantly different from the first embodiment described above. Further, a third induction heating source 6M is provided instead of the radiant electric heating source 7 provided in the first embodiment.

(Main part A)
As shown in FIG. 13, the main body portion A is covered with a top plate portion B which will be described later. It is formed in a substantially square or rectangular shape with a predetermined size that matches the size and space to cover.

  A main body case 2 shown in FIG. 14 forms an outer surface of the casing C. A body 2A formed by bending a single flat metal plate by a plurality of bending processes using a press molding machine, It consists of a front flange plate 2B made of a metal plate joined to the end of the body portion by fixing means such as welding or rivets, screws, etc., and the front flange plate 2B and the body portion 2A are fixed means In the coupled state, the box shape is opened on the upper surface. The lower part of the back surface of the box-shaped body 2A is an inclined part 2S, and the upper part is a vertical back wall 2U.

  The rear end, right end, and left end of the top opening of the main body case 2 have flanges that are formed by integrally bending outward in an L-shape, and the rear flange 3B and the left flange 3L. The right flange 3R and the front flange plate 2B are placed on the upper surface of the installation part of the kitchen furniture KT so as to support the load of the heating cooker.

  When the cooking device is completely accommodated in the installation opening K1 of the kitchen furniture KT, the front portion of the cooking device is exposed from the opening KTK formed in front of the kitchen furniture. The front (left and right) operation unit 60 (see FIG. 14) of the cooking device can be operated from the side.

  The inclined portion 2S connects the back surface and the bottom surface of the trunk portion 2A (see FIGS. 14 and 18). When the heating cooker is installed in the kitchen furniture KT, it is located behind the kitchen furniture installation port K1. Cut so that it does not collide or interfere with the edges. In other words, when this type of cooking device is installed in the kitchen furniture KT, it is tilted so that the front side of the main body A of the cooking device is down, and in this state, the kitchen furniture KT is installed first from the front side. Drop into mouth K1. After that, the rear side is dropped into the installation port K1 so as to draw an arc. Due to such an installation method, the front flange plate 2B is sufficient between the front edge of the installation opening K1 of the kitchen furniture (see FIG. 16) when the cooking device is installed in the kitchen furniture. The space SP is large enough to be secured.

  Inside the main body case 2, there are three induction heating sections 6L, 6R, 6M, a control means F to be described later for controlling the cooking conditions of the heating means, and an operating means E for inputting the cooking conditions to the control means; And display means G for displaying the operating conditions of the heating means inputted by the operating means. Also in the second embodiment, the first induction heating unit 6L is on the left side and the second induction heating unit 6R is on the right side. There is a third induction heating unit 6M at the center rear. Hereinafter, each will be described in detail.

  In the second embodiment, it is assumed that a pan having a diameter of 12 cm or more is used as a pan for the object to be heated N, and a pan (one-handed pan, two-handed pan, etc.) has a diameter of 16 cm, 18 cm, 20 cm, 24 cm. Various types such as a diameter of 20 cm for a frying pan, a diameter of 22 cm for a tempura pan, and a diameter of 29 cm for a wok can be used.

  As shown in FIG. 14, the inside of the casing C is roughly divided into a right cooling chamber 8R that extends long in the front-rear direction, a left cooling chamber 8L that also extends long in the front-rear direction, and a box-shaped grill (or roaster) heating chamber. 9. The upper part chamber 10 (same as the “parts storage room” in the first embodiment) and the rear exhaust chamber 12 are defined, but the rooms are not completely isolated from each other. For example, the right cooling chamber 8R and the left cooling chamber 8L communicate with the rear exhaust chamber 12 via the upper component chamber 10, respectively.

  The grill heating chamber 9 is a substantially independent sealed space with the front opening 9 </ b> A portion closed in a state where a door 13, which will be described later, is closed, but the external space of the housing portion C via the exhaust duct 14, that is, the kitchen. (See FIG. 18).

(Top plate B)
As will be described below, the top plate portion B is composed of two large parts, an upper frame (also referred to as a frame) 20 and a top plate (also referred to as an upper plate, top glass, or top plate) 21. The upper frame 20 is formed in a frame shape from a metal plate such as a nonmagnetic stainless steel plate or an aluminum plate, and has a size so as to close the upper surface opening of the main body case 2 (see FIGS. 13 and 15). ).

  The top plate 21 has a width dimension W2 that completely covers a large opening provided in the center of the frame-shaped upper frame 20 without a gap (see FIG. 20), and is placed over the main body case 2. ing. The top plate 21 transmits visible light from infrared rays and LEDs, and is entirely made of a transparent or translucent material such as heat-resistant tempered glass or crystallized glass. And it is formed in the rectangle or the square according to the shape of the opening of the upper frame 20. If the top plate 21 is transparent, the user can see all the built-in components such as the heating coil from above, which may impair the appearance. Or may be printed or painted on a fine spot or on a lattice that does not allow visible light to pass through.

  Further, the front, rear, left, and right side edges of the top plate 21 are fixed in a watertight state with rubber packing or a sealing material (not shown) interposed between the top plate 21 and the opening of the upper frame 20. Therefore, water droplets or the like are prevented from entering the inside of the main body A from the upper surface of the top plate 21 through a gap formed at the facing portion between the upper frame 20 and the top plate 21.

  In FIG. 13, the right vent hole 20 </ b> B is punched and formed at the same time by a press machine when the upper frame 20 is formed, and becomes an intake passage of the blower 30 described later. The central vent 20C is similarly punched when the upper frame 20 is formed, and the left vent 20D is similarly punched when the upper frame 20 is formed. Although only the rear portion of the upper frame 20 is shown in FIG. 13, when viewed from above, the entire upper surface of the main body case 2 is covered in a frame shape.

  The top plate 21 is induction-heated by first and second induction heating units 6L and 6R, which will be described in detail later in the actual cooking stage, and receives heat from the heated object N such as a hot pot, which is 300 degrees. It may be more than that.

  On the upper surface of the top plate 21, circular guide marks 6LM, 6RM, and 7MM that indicate rough positions of the first, second, and third induction heating sources 6L, 6R, and 6M as shown in FIGS. Are displayed by printing or other methods. The diameters of the left and right guide marks 6RM and 6LM are each plus 40 mm with respect to the outer diameter of each heating coil (however, since it changes with respect to the outer diameter of the coil, 40 mm is an example). This guide mark is originally intended to be a guide for the position where the object to be heated N is placed.

(Heating means D)
In the second embodiment of the present invention, as the heating means D, as described above, the first induction heating unit 6L, the second induction heating unit 6R, the third induction heating unit 6M, and the interior of the grill heating chamber 9 are used. And a pair of upper and lower radiant electric heating sources 22 and 23 for the roaster. These heating units are configured such that energization is controlled independently of each other by the control means F. Details will be described later with reference to the drawings.

(Second induction heating unit)
The second induction heating unit 6 </ b> R on the right side is installed inside the upper part chamber 10 that is partitioned in the main body case 2. A heating coil 6RC is disposed on the lower surface side on the right side of the top plate 21. The upper end of the coil 6RC is close to the lower surface of the top plate 21 with a small gap. In this embodiment, for example, a device having a maximum power consumption (maximum thermal power) of 3 KW is used. The heating coil 6RC is spirally wound into a bundle of 20 or 30 thin wires of about 0.1 mm to 0.3 mm, and this bundle (aggregate wire) is wound while twisting one or a plurality of wires, as shown in FIG. As shown in the figure, the outer shape is circular with the center point X2 as a base point, and is finally formed into a hollow disk shape (also referred to as a donut shape). The broken-line circle on the right side in FIG. 15 roughly indicates the outermost peripheral position of the heating coil 6RC. The diameter (maximum outer diameter dimension) of the heating coil 6RC is about 180 mm.

(First induction heating unit)
The first induction heating unit 6L on the left side is installed at a position that is substantially line symmetrical with the second induction heating source 6R across the left and right center line CL1 (see FIG. 20) of the main body A. In this embodiment, for example, a device having a maximum power consumption (maximum thermal power) of 3000 W is used.
As shown in FIGS. 20 and 21, the heating coil 6LC of the first induction heating unit 6L has an annular outer shape having a radius R1 with the center point X1 as a base point. Of the outer coil 6LC1 and the inner 6LC2, which will be described later, the outer diameter of the outer coil 6LC1 is about 130 mm. In FIG. 21, it corresponds to DA. In order to show a difference from the sub-heating coil SC described later, both the outer coil 6LC1 and the inner coil 6LC2 constituting the left heating coil 6LC are referred to as “main heating coil MC” (see FIG. 22).

  As shown in FIG. 20, the heating coil 6LC of the first induction heating source 6L is arranged so that the facing interval W5 between the second induction heating source 6R and the heating coil 6RC is 100 mm or more. . This is because, when one heated object N is heated by the first induction heating unit 6L, another heated object N is heated by the second induction heating unit 6R on the side thereof. This is a device for avoiding problems such as unpleasant noises caused by magnetic interference with each other in the case of “use”. The maximum outer diameter DB of the heating coil 6LC is about 200 mm (see FIG. 21). Note that the maximum outer diameter DB of the heating coil 6LC refers to the maximum diameter in a circular range including the sub-heating coil SC described later unless otherwise specified.

(Third induction heating unit)
The third induction heating unit 6M has the same configuration as the second induction heating unit 6R, but is different in size, maximum heating power, and the like. That is, the third induction heating unit 6M is installed at the rear position inside the upper part chamber 10 that is partitioned and formed inside the main body case 2. A flat annular heating coil 6MC that is close to the top plate 21 with a small gap is disposed. In the second embodiment, the third induction heating unit 6M having, for example, a maximum power consumption (maximum heating power) of 1500 W is used. The heating coil 6MC at the center is formed in a spiral shape by forming a thin wire of about 0.1 mm to 0.3 mm into a bundle of about 20 or 30 pieces, and twisting this bundle (aggregate line) one or more. And is finally formed into a hollow disk shape (also called a donut shape). The broken-line circle in FIG. 15 indicates the outermost peripheral position of the heating coil 6MC. The diameter (maximum outer diameter dimension) of the heating coil 6MC is about 130 mm.

  The third induction heating unit 6M has a distance W12 facing the side coil SC3 of the first induction heating unit 6L of about 50 mm, and a distance W11 facing the heating coil 6RC of the second induction heating source 6R of 60 mm. It is installed at a position to ensure the degree.

Here, the mutual positional relationship between the three heating coils 6RL, 6RC, and 6MC and the positional relationship with the rectangular upper storage chamber (also referred to as a component storage chamber) 10 will be described.
As shown in FIG. 20, the front wall 10 </ b> F constituting the main body case 2, a rear partition plate 28 that partitions the upper part chamber 10 and the rear exhaust chamber 12, which will be described later, and a vertical installation are installed (FIGS. 14 and 16). Reference) The component storage chamber 10 is surrounded by four components, that is, the right upper and lower partition plates 24R and the left upper and lower partition plates 24L.

In FIG. 20, W5 indicates the interval between two adjacent left and right heating coils 6RC, 6RC, and is about 100 mm as described above. In other words, W5 is the facing distance between the first induction heating unit 6R having a circular heating region with a radius R3 and the second induction heating unit 6R having a circular heating region with a radius R2.
W6: The distance from the left inner surface of the component storage chamber 10 to the center point X1 of the first induction heating unit 6L is 180 mm.
W7: The distance from the front inner surface of the component storage chamber 10 to the foremost end of the first induction heating unit 6L, which is 50 mm or less. Desirably 44 mm.
W8: The distance between the left inner surface of the component storage chamber 10 and the leftmost end of the left induction heating unit 6L is 30 mm or less. Desirably 22 mm.
W9: The distance from the front inner surface of the component storage chamber 10 to the foremost end of the second induction heating unit 6R, which is 80 mm or less. Desirably 47 mm.
W10: The distance between the right inner surface of the component storage chamber 10 (the left side surface of the right upper and lower partition plates 24R) and the leftmost end of the second induction heating unit 6R, which is 30 mm or less. Desirably 17 mm.
W11: The shortest distance between the heating coil 6RC of the second induction heating unit 6R and the heating coil 6MC of the third induction heating unit 6M, which is 50 mm or less. Desirably 40 mm.
W12: The shortest distance between the sub-heating coil of the first induction heating unit 6R and the heating coil 6MC of the third induction heating unit 6M, which is about 40 mm.
W21: 30 mm, the shortest distance between the heating coil 6MC of the third induction heating unit 6M and the rear inner surface of the component storage chamber 10 (front surface of the rear partition plate 28).

As described above, W20 is a space in which the cooling unit CU is installed, and is at least 50 mm. However, this space should be narrow. This is because the effective area of the component storage chamber 10 is increased, and there are fewer restrictions on the installation of the plurality of induction heating coils. Although the actual upper limit dimension of the lateral width W20 is 100 mm, it is desirable that the left and right dimensions be the same from the viewpoint of sharing the cooling unit CU as much as possible on the left and right.
Note that the various dimensions W5 to W21 are merely examples, and are not absolute in securing the function of the heating cooker, so that these dimensions can be changed as appropriate.

  The circular guide mark EM displayed on the top plate 21 is a wide circular shape including a main heating coil MC, which will be described later, and all the sub-heating coils SC (four in total) disposed at substantially equal intervals in front, rear, left and right positions. An area (hereinafter referred to as “cooperative heating area mark”) is indicated. Further, the position of the cooperative heating area mark EM is determined by radiating light from below the top plate 21 to the outer limit of a preferred place to be heated at the time of cooperative heating of the main heating coil MC and the auxiliary heating coil SC. For the purpose of illustration, it is almost coincident with the position of a “wide-area light emitting section” to be described later.

  An infrared temperature detection element (hereinafter referred to as an infrared sensor) 31L is installed in the inner space of the left heating coil 6LC (see FIGS. 21, 28, and 29). Details will be described later.

  The heating coil 6LC of the first induction heating unit 6L is composed of an outer coil 6LC1 and an inner coil 6LC2 that are divided into two in the radial direction. These two coils are connected in series as shown in FIG. belongs to. In addition, the whole may be a single coil without using two coils.

  As shown in FIGS. 24 and 29, on the lower surfaces (back surfaces) of the left and right heating coils 6LC and 6RC, as a magnetic flux leakage prevention material 73 from these heating coils, a highly permeable material (for example, a rectangular cross section formed of ferrite). Bar) is placed. For example, in the left heating coil 6LC, four, six, or eight are arranged radially from the center point X1 (not necessarily an even number).

  That is, the magnetic flux leakage prevention material 73 does not need to cover the entire lower surfaces of the left and right heating coils 6LC and 6RC, and the magnetic flux leakage prevention material 73 formed into a rod shape with a cross section of, for example, a square or a rectangle is used as the coil wire of the right heating coil 6RC. A plurality may be provided at predetermined intervals so as to intersect. Therefore, in the second embodiment, a plurality of radial lines are provided from the center point X1 of the left heating coil 6LC. With such a magnetic flux leakage prevention material 73, the magnetic lines of force generated from the heating coil can be concentrated on the object to be heated N on the top plate 21.

  The right side heating coil 6RC and the left side heating coil 6LC may be divided into a plurality of parts so as to be energized independently. For example, a heating coil is wound inside in a spiral shape, and the heating coil is placed in a concentric circle on the outer peripheral side of the heating coil and in another large-diameter spiral shape on substantially the same plane. The object to be heated N may be heated in three energization patterns: energizing the heating coil and energizing both the inner and outer heating coils.

  In this way, the object to be heated (pot) N from small to large (large diameter) can be obtained by combining at least one of the output level, duty ratio, and output time interval of the high-frequency power flowing through the two heating coils. (Japanese Patent No. 2978069 is known as a typical technical document using such a plurality of heating coils that can be independently energized).

The temperature detection element 31R is an infrared temperature detection element installed in the space provided in the center of the right heating coil 6RC, and the infrared light receiving part at the upper end is directed to the lower surface of the top plate 5 ( (See FIG. 28).
Similarly, the left heating coil 6LC is provided with an infrared temperature detection element 31L in a space provided at the center thereof (see FIGS. 21 and 29). This will be explained in detail later.

  The infrared temperature detection elements 31R and 31L (hereinafter referred to as infrared sensors) are configured by photodiodes or the like that can measure the temperature by detecting the amount of infrared rays radiated from a heated object N such as a pan. The temperature detection element 31R (the temperature detection element 31L is also the same, and in the following, in the case where both are common, only the temperature detection element 31R will be described as a representative) is a heat transfer type detection element such as a thermistor. A temperature sensor may be used.

  For example, Japanese Laid-Open Patent Publication No. 2004-95144 (Japanese Patent No. 3975865) and Japanese Laid-Open Patent Publication No. 2004-95144 disclose that infrared rays emitted from an object to be heated according to the temperature thereof are rapidly detected from below the top plate 5 by an infrared sensor. No. 2006-310115 and Japanese Patent Application Laid-Open No. 2007-18787 are known.

  When the temperature detection element 31R is an infrared sensor, the infrared rays emitted from the object N to be heated can be collected and received in real time (with little time difference), and the temperature can be detected from the amount of infrared rays (thermistor). Better than formula). Even if the temperature of the top plate 21 made of heat-resistant glass or ceramics in front of the object to be heated N and the temperature of the object to be heated N are not the same, this temperature sensor is used regardless of the temperature of the top plate 21. The temperature of the heated object N can be detected. That is, the infrared rays radiated from the heated object N are devised so that they are not absorbed or blocked by the top plate 21.

  For example, the top plate 21 is selected from a material that transmits infrared rays having a wavelength range of 4.0 μm or 2.5 μm or less, while the temperature sensor 31R detects infrared rays having a wavelength range of 4.0 μm or 2.5 μm or less. The one is selected.

  On the other hand, when the temperature detection element 31R is of a heat transfer type such as a thermistor, it is inferior in capturing a rapid temperature change in real time as compared with the above-described infrared temperature sensor, By receiving the radiant heat from the heated object N, it is possible to reliably detect the temperature of the bottom of the heated object N or the top plate 21 directly below the bottom. Further, the temperature of the top plate 21 can be detected even when there is no object to be heated N.

  When the temperature detecting element is a heat transfer type such as a thermistor, the temperature sensing part is brought into direct contact with the lower surface of the top plate 21 or a member such as a heat transfer resin is interposed to cause the top plate 21 itself. You may make it grasp | ascertain the temperature of as accurately as possible. This is because if there is an air gap between the temperature sensing unit and the lower surface of the top plate 21, a temperature transmission is delayed.

  In the following description, the description of “left, right” in the name and “L, R” in the reference may be omitted for the contents shared for the members arranged in common on the left and right.

(Cooling room)
The right upper and lower partition plates 24R are installed vertically (see FIGS. 14 and 16), and function as a partition wall that separates the right cooling chamber 8R and the grill heating chamber 9 from each other inside the casing C. Plays. The left upper and lower partition plates 24L are also installed vertically (see FIG. 14), and serve as a partition wall that isolates the left cooling chamber 8L and the grill heating chamber 9 from each other inside the casing C. . The upper and lower partition plates 24R and 24L are installed so as to maintain the above-described distance W20 between the left and right side wall surfaces of the main body case 2.

The horizontal partition plate 25 (see FIGS. 14 and 17) has a size that divides the entire space between the left and right upper and lower partition plates 24L and 24R into two upper and lower spaces. This is the parts chamber 10. Further, the horizontal partition plate 25 is installed with a predetermined gap 116 (see FIG. 18) of about several to 10 mm from the ceiling surface of the grill heating chamber 9.
The cutouts 24A are formed in the left and right upper and lower partition plates 24L and 24R, respectively, so that they will not collide with the cooling ducts 42 described later when they are installed horizontally (see FIG. 14).

  The grill heating chamber 9 formed in the shape of a rectangular box has wall surfaces on the left, right, top, bottom, and back sides made of a metal plate such as stainless steel or steel plate, and a radiant electric heater such as a sheathed heater near the top ceiling and bottom. A pair of upper and lower radiant electric heating sources 22 and 23 (see FIG. 18) are installed so as to spread substantially horizontally. Here, “spread” means that the sheath heater is bent several times in the horizontal plane and snakes so as to occupy an area as wide as possible in plane, and the planar shape is W-shaped. The thing is a typical example.

  The two upper and lower radiant electric heating sources 22 and 23 are energized simultaneously or individually to set the roast cooking (for example, grilled fish), grill cooking (for example, pizza or gratin), and the ambient temperature in the grill heating chamber 9 for cooking. Oven cooking (for example, cakes and baked vegetables) can be performed. For example, the radiant electric heating source 22 near the upper ceiling of the grill heating chamber 9 has a maximum power consumption (maximum heating power) of 1200 W, and the radiant electric heating source 23 near the bottom of the grill heating chamber 9 has a maximum power consumption of 800 W.

  The air gap 26 (see FIG. 18) is a gap formed between the horizontal partition plate 25 and the outer frame 9D of the grill heating chamber 9 (the same as the air gap 116 described above), and this is finally the rear exhaust. It communicates with the chamber 12, and the air in the gap 26 is drawn out of the main body A through the rear exhaust chamber 12 and discharged.

  In FIG. 14, a rear partition plate 28 divides the upper part chamber 10 and the rear exhaust chamber 12. The lower end portion has a height that reaches the horizontal partition plate 25, and the upper end portion has a height that reaches the upper frame 20. ing. The exhaust ports 28 </ b> A are formed at two locations on the rear partition plate 28, and are for exhausting the cooling air that has entered the upper part chamber 10.

(Cooling fan)
The blower 30 referred to in this embodiment uses a centrifugal multi-blade blower (typically, there is a sirocco fan) (see FIGS. 16 and 17), and the tip of the rotary shaft 32 of the drive motor 300. A wing portion 30F is fixed to the wing portion. The blower 30 is installed in each of the right cooling chamber 8R and the left cooling chamber 8L, and cools the circuit boards for the left and right IH heating coils 6LC and 6RC and the heating coils themselves. I will explain it.

  As shown in FIGS. 16 and 17, the cooling unit CU is inserted and fixed in the cooling chambers 8R and 8L from above, a component case 34 containing a circuit board 41 constituting an inverter circuit, and a component case 34 A fan case 37 that is coupled and forms a blower chamber 39 of the blower 30 is provided.

  The blower 30 is a so-called horizontal shaft type in which the rotation shaft 32 of the drive motor 300 is horizontal, and is accommodated in a fan case 37 installed in the right cooling chamber 8R. A circular air space is formed in the fan case 37 so as to surround a large number of blades 30 </ b> F of the air blower 30, and a air blowing chamber 39 is formed. A suction port 37B is formed at the top of the suction cylinder 37A of the fan case 37. An exhaust port (exit) 37 </ b> C is formed at one end of the fan case 37.

  The fan case 37 is formed as an integral structure by combining two plastic cases 37D and 37E and connecting them with a fixing tool such as a screw. In this coupled state, it is inserted into the cooling spaces 8R and 8L from above and fixed so as not to move by an appropriate fixing means.

  The component case 34 is connected in close contact with the fan case 37 so that cooling air discharged from an air outlet 37C for discharging air from the fan case 37 is introduced, and has a horizontally long rectangular shape as a whole. The other parts except for the introduction port (not shown) communicating with the exhaust port 37C and the first exhaust port 34A and the second exhaust port 34B described later are hermetically sealed. Has been.

  A printed wiring board (hereinafter, referred to as a circuit board) 41 includes inverter circuits (210R, 210L, 210L, 210L) that supply predetermined high-frequency power to the right induction heating source 6R, the left induction heating source 6L, and the central induction heating source 6M. 210M) is mounted, has an outer dimension substantially comparable to the shape of the internal space of the component case 34, and is located on the side far from the grill heating chamber 9 in the component case 34. Is placed close to a few millimeters or less. A power supply for driving the drive motor 300 of the blower 30 and a control circuit portion are mounted on the circuit board 41 apart from the inverter circuit portion.

  The inverter circuits 210R, 210L, and 210M in the circuit board 41 are the DC side outputs except for the rectifier bridge circuit 221 shown in FIG. 25 in which the input side is connected to the bus of the commercial power supply. A circuit including a DC circuit including a coil 222 and a smoothing capacitor 223 connected to terminals, a resonance capacitor 224, an IGBT 225 which is a power control semiconductor serving as a switching means, a drive circuit 228, and a flywheel diode 226 The heating coils 6RC, 6LC, and 6MC, which are mechanical structures, are not included.

  On the upper surface of the component case 34, two first exhaust ports 34A and two second exhaust ports 34B are formed apart from each other along the direction in which the cooling air from the blower 30 flows. The second exhaust port 34B is located at the most downstream side of the flow of the cooling air in the component case 34, and has an opening area several times larger than that of the first exhaust port 34A. In FIG. 17, Y1 to Y5 indicate the flow of the air sucked and discharged by the blower 30, and the cooling air flows in sequence with Y1, Y2,.

  The cooling duct 42 is entirely molded of plastic, and includes an upper case 42A that is an integrally molded product of plastic, and a flat lid (hereinafter referred to as “lower case”) 42B that is also an integrally molded product of plastic. By overlapping and fixing with screws, three ventilation spaces 42F, 42G, and 42H, which will be described later, are formed between the two (see FIG. 17).

A large number of the ejection holes 42C are formed so as to penetrate the wall surface over the entire upper surface of the upper case 42A. The ejection holes 42C are for ejecting cooling air from the blower 30, and the diameters of the ejection holes 42C are the same. .
The partition wall 42D has a rib (projection) shape integrally formed in the upper case 42A in a straight line or a curved line, and thereby, a ventilation space 42F having one end communicating with the first exhaust port 34A of the component case 34. Are partitioned (see FIG. 17).

  Similarly, the partition wall 42E has a U-shaped ridge shape integrally formed in the upper case 42A, and thereby a ventilation space 42H having one end communicating with the second exhaust port 34B of the component case 34 is formed. A compartment is formed. This ventilation space 42H communicates with the widest ventilation space 42G through a communication port (hole) 42J (see FIG. 19) formed in one side of the partition wall 42E (the side close to the component case 34 in FIG. 14). (See FIG. 17).

  Further, the cooling duct 42 is installed so that one side of the ventilation space 42H (the side close to the component case 34 in FIG. 14) is directly above the second exhaust port 34B of the component case 34. Thereby, the cooling air discharged from the component case 34 enters the ventilation space 42H of the cooling duct 42, expands from here to the ventilation space 42G, and is ejected from each ejection hole 42C. The ventilation openings 42K are rectangular ventilation openings formed corresponding to the ventilation spaces 42H of the upper case 42A, and emit air for cooling liquid crystal display screens 45R and 45L described later.

  In FIG. 17, 43A and 43B are aluminum radiation fins. The radiating fin is a circuit board on which inverter circuits (described in detail in FIG. 25) 210R, 210L, and 210M for the first induction heating unit 6L, the second induction heating source 6R, and the third induction heating unit 6M are mounted. 41 is attached to a semiconductor switching element for power control such as IGBT 225 in 41 and other heat-generating components, and a large number of thin fins are regularly arranged throughout.

  Note that the two radiation fins 43A and 43B shown in FIG. 17 are for the component case 34 installed in the right cooling chamber 8R inside the main body case 2. That is, it is for the inverter circuit 210R for the second induction heating unit 6R and the inverter circuit 210M for the third induction heating source 6M. The inverter circuit 210L for the first induction heating source 6L on the left side is disposed inside the component case 34 installed in the left cooling chamber 8L inside the main body case 2, and the component case includes the radiating fins 43A, Radiation fins (not shown) similar to 43B are provided.

  As shown in FIGS. 17A and 17B, the heat dissipating fins 43A and 43B are installed on the side closer to the ceiling than the bottom in the component case 34, so that a sufficient space is secured below, and the cooling air Y4 flows through the space. It has become. In other words, due to the characteristics of the blower 30, the discharge capacity (discharge capacity) is not uniform over the entire area of the discharge port (exhaust port 37C), and the highest part of the discharge capacity is below the vertical center point of the exhaust port 37C. The positions of the radiation fins 43A and 43B are set upward so as not to be positioned on the extended line of the position. Further, the cooling air is not blown toward various small electronic components and printed wiring pattern portions mounted on the surface of the circuit board 41.

  The inverter circuit 210L for the left induction heating source 6L includes a dedicated main inverter circuit MIV that drives the main heating coil MC and dedicated sub inverter circuits SIV1 to SIV4 that individually drive the plurality of sub heating coils SC. (See FIG. 25).

  The grill heating chamber 9 is built below the left and right induction heating sources 6L and 6R of the main body A, and a predetermined space SX (see FIG. 18) is formed between the inner rear wall surface of the main body A. That is, the grill heating chamber 9 is provided with the space SX of 10 cm or more between the body case 2 and the body rear wall 2U in order to install an exhaust duct 14 to be described later and to form the exhaust chamber 12.

  When the two independent cooling units CU are inserted and fixed in the cooling chambers 8R and 8L from above, a part of the fan case 37 shown in FIG. The component case 34 that partially protrudes to the reference) and that houses the circuit board 41 is formed with a predetermined gap from the left and right side wall surfaces of the grill heating chamber 9. The gap here means a gap between the left and right outer wall surfaces of the grill heating chamber 9 and the component case 34, and the left and right upper and lower partition plates 24L and 24R and the component case in this embodiment. It does not mean the facing gap between the outer surface of 34.

  Thus, the fan case 37 portion of the cooling unit CU is disposed in the space SX even when the grill heating chamber 9 is present, and when viewed from the front, the portion of the fan case 37 of the cooling unit CU is the grill. By partially overlapping the heating chamber 9, it is possible to prevent an increase in the width dimension of the main body A.

(Operating means E)
The operation means E of the heating cooker in the second embodiment includes a front operation unit 60 and an upper operation unit 61 (see FIGS. 13 to 15).

(Front operation unit)
Plastic front operation frames 62R and 62L are attached to the front surfaces of the left and right sides of the main body case 2, and the front surface of the operation frame is a front operation unit 60. The front operation unit 60 is supplied with all power sources for the first induction heating unit 6L, the second induction heating unit 6R, the third induction heating unit 6M, and the radiation electric heating sources 22 and 23 of the grill heating chamber 9. Electricity of the operation button 63A (see FIG. 14) of the main power switch 63 that is turned on / off all at once and the right power switch (not shown) that controls the energization of the second induction heating unit 6R and the energization amount (thermal power). A right operation dial 64R for opening and closing the contact and a left operation dial 64L for a left control switch (not shown) for controlling the energization of the first induction heating unit 6L and the energization amount (thermal power) are also provided. Yes. Power is supplied to all the electric circuit components shown in FIG. 23 via the main power switch 63.

  The front operation unit 60 includes a left indicator lamp 66L that is lit only when the first induction heating unit 6L is energized by the left operation dial 64L, and a second operation heating unit 6R by the right operation dial 64R. A right indicator lamp 66R that is lit only in the energized state is provided.

  When the left operation dial 64L and the right operation dial 64R are not used, they are pushed inward so as not to protrude from the front surface of the front operation unit 60 as shown in FIG. When the user presses the finger once and then releases it, it protrudes by the force of a spring (not shown) built in the front operation frame 62 (see FIG. 14), and the user can grab the surrounding and turn it. Is. And if it turns to the left or right by one stage at this stage, the first and second induction heating units 6L and 6R are energized for the first time (with the minimum set heating power of 150 W).

  Therefore, if either the protruding left operation dial 64L or right operation dial 64R is further rotated in the same direction, a predetermined electrical pulse generated from a built-in rotary encoder (not shown) according to the amount of rotation. Is read by the control means F, the energization amount of the heating source is determined, and the heating power can be set. Note that the left operation dial 64L and the right operation dial 64R are both in an initial state or are turned to the left and right in the middle, and the user presses once with a finger from the front surface of the front operation unit 10. Push into a predetermined position that does not protrude (when pushed back, it is held at that position, and any of the first and second induction heating units 6L, 6R can be stopped instantaneously (for example, even during cooking) If the right operation dial 64R is pushed in, the second induction heating unit 6R is immediately energized).

  If the operation button 63A of the main power switch 63 (see FIG. 13) is opened, then the operations of the right operation dial 64R and the left operation dial 64L are invalidated simultaneously. Similarly, the energization of the third induction heating unit 6M and the radiant electric heating sources 22 and 23 installed in the grill heating chamber 9 is also cut off.

  Further, three independent timer dials (not shown) are provided at the lower front portion of the front operation frame 62. These timer dials energize the first, second, and third induction heating units 6L, 6R, and 6M for a desired time (timer set time) from the start of energization, and automatically after the set time has elapsed. This is for operating a timer switch (also called a timer counter, not shown) for turning off the power.

(Top operation section)
As shown in FIG. 15, the upper surface operation unit 61 includes a right operation unit 70, a left operation unit 71, and a central operation unit 72. That is, at the front upper surface of the top plate 21, the right operation unit 70 of the second induction heating unit 6R is on the right side and the third induction heating unit 6M and A central operation unit 72 of the radiant electric heating sources 22 and 23 installed in the grill heating chamber 9 is disposed, and a left operation unit 71 for the first induction heating source 6L is disposed on the left side.

  Various keys for using a stainless steel or iron cooking container (not shown) are provided on the upper surface operation unit, and a bread dedicated key 250 is provided therein. In addition, instead of a dedicated key for specific cooking (for example, bread), a common key dedicated to use a cooking container is provided, and each time the key is pressed, a desired cooking name (for example, the integrated display device 100 described later) is displayed. An operable key (bread) is displayed (input keys 141 to 145, which will be described later), and the area of the key is touched with a finger to input a desired cooking start command. Also good. The cooking container can be used even if it is inserted into the grill heating chamber 9 from the front opening 9A and placed on the grill 109.

  Further, the upper surface operation unit 61 uses the first, second, and third induction heating units 6R, 6L, and 6M and the radiant electric heating sources 22 and 23 to cook the cooking container (hereinafter referred to as “the cooking container”). A combined cooking key 251 for “combined heat cooking” or “combined cooking” is provided. In the first embodiment, the second induction heating unit 6R and the radiant electric heating sources 22 and 23 of the grill heating chamber 9 can be combined and heated. It is provided near the operation unit 70 for setting thermal power (see FIG. 13).

  The composite cooking key 251 is not a fixed key, button, knob, or the like, but displays a desired key on a display screen (liquid crystal screen or the like) of the integrated display means 100 described later and uses the area of the key. The form which enables the input of compound cooking by a person touching with a finger may be sufficient. In other words, a key shape that can be input in a timely manner by software is displayed on the display screen of the integrated display unit 100, and an input operation may be performed by touching the key shape.

(Right heating power setting operation section)
15 and 30, the right heating power setting operation unit 70 has a one-touch setting key for each heating power that allows the user to easily set the heating power of the second induction heating unit 6R only by pressing once. A section 90 is provided. Specifically, it has three one-touch keys, a low thermal power key 91, a medium thermal power key 92, and a strong thermal power key 93. The low thermal power key 91 sets the thermal power of the second induction heating unit 6R to 300 W, and The thermal power key 92 is set to 750 W, and the strong thermal power key 93 is set to 2500 W. Furthermore, the strongest heating power key 94 is provided at the right end portion of the right one-touch key portion, and when it is desired to set the heating power to 3000 W, this is pressed.

(Left thermal power setting operation section)
Similarly, a one-touch key group similar to the right heating power setting operation unit 70 is also installed in the left heating power setting operation unit 71 for setting the heating power of the first induction heating unit 6L.

(Central control unit)
15 and 30, the central operation unit 72 includes an operation button 95 of an operation switch for starting energization of the radiant electric heating sources 22 and 23 of the grill heating chamber 9 used for grill (roast) cooking and oven cooking. Further, operation buttons 96 of operation switches for stopping the energization are provided side by side.

  The central operation unit 72 has an operation of a temperature adjustment switch for setting the control temperature in the grill cooking by the radiant electric heating sources 22 and 23 and the electromagnetic cooking by the third induction heating unit 6M one by one in addition or subtraction. Buttons 97A and 97B are provided in a horizontal row. Further, setting switches 99A and 99B for setting the power on / off switch button 98 of the third induction heating unit 6M7 and the heating power one step at a time in an additive or subtractive manner are also provided here.

  Further, as shown in FIG. 30, the central operation unit 72 is provided with a convenient menu key 130. When it is operated, deep-fried food cooking (using the first induction heating unit 6L or the second induction heating unit 6R), fried food preheating state display (using the first induction heating unit 6L or the second induction heating unit 6R, Oil is heated to a predetermined preheating temperature), timer cooking (first induction heating unit 6L, second induction heating unit 6R, third induction heating unit 6M or radiant electric heating provided inside the grill heating chamber 9) When the sources 22 and 23 are pressed when setting the cooking by energizing only during the time set by the timer switch, a desired input screen and status display screen can be easily read out to the integrated display means 100 described later.

  On the right side of the bread dedicated key 250, a right IH convenient menu button 131R including a hard button is provided, which is a setting button for making various settings for the second induction heating unit 6R. Similar setting buttons are also provided for the first induction heating unit 6L (not shown).

  When the start switch for operating / starting the timer counter (not shown) is operated to use the first or second induction heating unit 6R, 6L, the liquid crystal display screens 45R, 45L are displayed at the start point. The elapsed time from is measured and displayed as a number. The display light on the liquid crystal display screens 45R and 45L is transmitted through the top plate 21, and the elapsed time from the start of the heating operation is clearly displayed to the user in real time in units of “minutes” and “seconds”. In addition, the liquid crystal display screen 45R is installed on the left side of the metallic upper and lower partition plates 24L that become the left wall of the component storage chamber 10 when the main body A is viewed in plan, and the other liquid crystal display screen Similarly, 45R is installed on the right side of the metallic upper and lower partition plates 24R that become the right wall of the component storage chamber 10. For this reason, these two liquid crystal display screens 45L and 45R are hardly affected by the leakage magnetic flux from the first induction heating unit 6L and the second induction heating unit 6R.

  Similarly to the right heating power setting operation unit 70, the left heating power setting operation unit 71 is provided with a left timer switch (not shown) and a left liquid crystal display unit 45L. It is provided at the right and left target positions across CL1.

(Thermal power display)
Right thermal power display unit 101R that displays the magnitude of the thermal power of the second induction heating unit 6R at a position between the second induction heating unit 6R and the right thermal power setting operation unit 70 on the right front side of the top plate 21. Is provided. The right heating power display unit 101R is provided in the vicinity of the lower surface of the top plate 21 so that display light is emitted from the lower surface thereof through the top plate 21 (transmitted). The display screen of this display unit is the same type of liquid crystal screen as the display screen 100.

  Similarly, the left heating power display unit 101L that displays the magnitude of the heating power of the first induction heating unit 6L is the first left induction heating unit 6L and the left heating power setting operation unit 71 on the left front side of the top plate 21. And is provided in the vicinity of the lower surface of the top plate 21 so that display light is emitted from the lower surface thereof through the top plate 21 (transmitted). The display units 101R and 101L are not shown in the circuit configuration diagram of FIG. Further, the display screen of these display units is a liquid crystal screen of the same type as the display screen 100, and when the thermal power is not input, the whole is a blue screen, but when setting the thermal power to start cooking, Since a band of red or orange light is displayed according to the magnitude of the set thermal power, the user can easily recognize the magnitude of the thermal power. A predetermined space WY is secured between the display screen of the left heating power display unit 101L and the foremost part of the heating coil 6LC of the first induction heating unit 6L. The size of this space WY is 30 mm.

(Display means G)
The display means G of the heating cooker in this embodiment has a common liquid crystal display screen 100 serving as an integrated display means.
As shown in FIGS. 15, 20, and 30, a rectangular display screen 100 is provided on the front side in the front-rear direction at the center in the left-right direction of the top plate 21. The integrated display means 100 is mainly composed of a liquid crystal display panel, and is provided in the vicinity of the lower surface of the top plate 21 so that display light is emitted from the lower surface of the liquid crystal display panel through the top plate 21 (transmitted).

The integrated display means 100 is connected to the first induction heating unit 6L, the second induction heating unit 6R, the third induction heating unit 6M, the radiating electric heating sources 22 and 23 in the grill heating chamber 9, and the like. Time etc.) can be entered and confirmed. That is,
(1) Functions of the first and second induction heating units 6L and 6R (whether cooking operation is being performed, etc.)
(2) Function of third induction heating unit 6M (whether cooking operation is being performed, etc.)
(3) In the case of cooking in the grill heating chamber 9, there are three scenes of operation procedures and functions for performing the cooking (for example, whether roaster, grilling, or oven cooking is currently being performed). Corresponding to the above, the heating conditions such as the operation status and the thermal power are clearly displayed by characters, illustrations, graphs and the like.

  The display screen 100 used in the integrated display means G is a dot matrix type liquid crystal screen as in the first embodiment. The size of the effective display area of the display screen is a rectangle having a length (front-rear direction) of about 6 cm and a width of about 12 cm. A space WX having a predetermined shortest distance is secured between the outermost side of the display screen and the outermost peripheral surface of the heating coil 6LC of the first induction heating unit 6L. The size of this space WY is 50 mm. Since there is a frame around the display screen 100, the substantial distance to the periphery of the screen excluding the frame is 45 mm. These dimensions are more than twice as large as the space WY (30 mm) secured between the display screen of the left heating power display unit 101L and the heating coil 6LC frontmost part of the first induction heating unit 6L. It can be said that it is far from it.

Further, the screen area for displaying information is divided into a plurality of heating sources (see FIG. 30). For example, the screen is assigned to a total of 10 areas and is defined as follows.
(1) Corresponding area 100L of the first induction heating unit 6L (total of 100L1 for thermal power and 100L2 for time and cooking menu),
(2) Corresponding area 100M of the third induction heating unit 6M (total of 100M1 for thermal power and 100M2 for time),
(3) Corresponding area 100R of the second induction heating unit 6R (total of 100R1 for thermal power and 100R2 for time),
(4) Cooking area 100G of grill heating chamber 9,
(5) A guide area (100GD) for displaying reference information in various cookings at any time or by user operation and notifying the user when abnormal operation is detected or improper operation is used,
(6) a key display area 100F for displaying six independent input keys 141, 142, 143, 144, 145, and 146 having a function of directly inputting various cooking conditions and the like;
(7) one arbitrary display area 100N;
Each is equipped.

  As shown in FIGS. 30 and 31, in the corresponding area 100L of the first induction heating unit 6L, specifically, the time and cooking menu area 100L2, a selection key E1A for high-speed heating is used for selecting a cooking menu. Hot water selection key E1B, Boil selection key E1C, Preheating selection key E2A, Cooking rice selection key E2B, Deep-fried food selection key E3A, Hot water heating + Keeping heat selection key E3B Is displayed.

  FIG. 33 shows a case where high-speed heating is selected. The selection key E1A remains displayed as it is, and all other selection keys disappear, so that the cooking menu “high-speed heating” meaning E1A is selected and displays that the heating operation is currently being executed.

  The bottom diameter of the object to be heated N is usually about a pan, the object to be heated is above the main heating coil MC, and it is not large enough to straddle the four sub-heating coils SC1 to SC4. When the heated object placement determining unit 280 determines, the seven keys E1A, E1B, E1C, E2A, E2B, E3A, and the key E3B for selecting the cooking menu are not displayed. That is, in the case of a large object N to be straddled over any of the sub-heating coils SC1 to SC4, the seven keys E1A, E1B, E1C, E2A, E2B, E3A, and key E3B for selecting the cooking menu can be selected for the first time. .

If the key 100N of the arbitrary display area is pressed, detailed information useful for cooking can be displayed in the guide area 100GD of the integrated display means 100 in characters.
Further, the background color of the display area is usually displayed in a unified color (for example, white), but the display areas 100R and 100G are the same in the case of the above-mentioned “combined cooking”. The color changes to a color different from the display areas 100L and 100M of the other heating sources (for example, yellow or blue). Such a color change can be achieved by switching the operation of the backlight when the display screen is a liquid crystal display, but detailed description thereof is omitted.

  Each of the above 10 areas (display areas) is realized on the liquid crystal screen of the integrated display means 100, but is not physically formed or partitioned on the screen itself. Absent. That is, since it is established by screen display software (microcomputer program), the area, shape, and position can be changed each time by the software. The second and third induction heating units 6L, 6R, 6M and the like are always arranged in the same order in accordance with the left and right order of the respective heating sources.

  That is, on the screen, information about the first induction heating unit 6L on the left side, the third induction heating unit 6M in the middle, and information about the second induction heating unit 6R on the right side are displayed. The cooking display area 100G of the grill heating chamber 9 is always displayed on the near side of the corresponding areas 100L, 100M, and 100R. Further, the input key display area 100F is always displayed at the forefront in any scene.

  Further, the input keys 141 to 146 employ contact type keys whose capacitance changes when the user touches a finger or the like, and the upper surface of the integrated display means 100 at a position corresponding to the key surface of the user. An effective input signal to the energization control circuit 200 is generated by lightly touching the upper surface of the glass plate covering the cover.

  On the glass plate constituting the parts (areas) of the input keys 141 to 146, characters, figures and symbols (including the arrows of the keys 143 and 145 in FIG. 30) indicating the key input function are printed or stamped. However, on the liquid crystal screen (key display area F) below these keys, characters, figures, and symbols indicating the key input function are displayed for each operation scene of the input keys. Yes.

  Not all input keys 141 to 146 are always displayed at the same time. Keys that are invalid even if operated (input keys that do not need to be operated) are made inactive by not displaying input function characters and graphics on the liquid crystal screen, like the input keys 144 in FIG. Yes. When the input keys 141 to 146 in the active state are operated, the operation command signal becomes effective for the control program that determines the operation of the energization control circuit 200.

  The input key 146 is a key that is operated when it is desired to determine cooking conditions and to start cooking. When this is operated once and the cooking operation is started, the input key is changed to the “stop” display (see FIGS. 30 and 31). The input commands of the other input keys 141 to 145 may change each time, and an effective input function can be easily identified by characters, figures, symbols, etc. displayed each time.

  If it is desired to stop a specific heating source while using a plurality of heating sources, for example, when the input key 143 is pressed in the scene of FIG. 28, the first induction from the corresponding area 100M of the third induction heating unit 6M. Since the corresponding area 100L of the heating unit 6L and the corresponding area 100R of the second induction heating unit 6R are displayed in order in the order of the color change or blinking, the desired corresponding area is called. (Select) and press the stop key 146. On the contrary, when the input key 145 is pressed, it can be selected in the reverse direction, the corresponding area 100M of the third induction heating unit 7 can be sequentially selected from the corresponding area 100R to the corresponding area 100L, and the desired corresponding area can be called. Then, the stop key 146 may be pressed.

  AM is an active mark that is displayed next to the name of the heating source that is performing the cooking operation. When this is displayed, it means that the heating source is being driven at that time. The user can recognize the operation of the heating source with or without the display.

(Grill heating chamber 9)
As shown in FIGS. 13 and 18, the front opening 9 </ b> A of the grill heating chamber 9 is covered by a door 13 so as to be opened and closed, and the door 13 can be moved in the front-rear direction by a user operation. Are supported by a support mechanism (not shown) such as a rail or a roller. Further, a window plate made of heat-resistant glass is installed in the central opening 13A of the door 13 so that the inside of the grill heating chamber 9 can be visually recognized from the outside. A handle 13 </ b> B protrudes forward to open and close the door 13. The grill heating chamber 9 is formed with a predetermined space SX (see FIG. 18) between the inner rear wall surface of the main body as described above, and an exhaust duct 14 to be described later is installed using this space. An exhaust chamber 12 is formed.

  The door 13 is connected to the front end of a metal rail extending forward and backward at both the left and right positions of the heating chamber 9, and when cooking with a lot of oil, the metal tray 108 (FIG. 18) is usually placed on the rail. (See). A metal grill 109 is placed on the tray 108 for use. As a result, when the door is pulled out to the front in the horizontal direction, the tray 108 (the grill net when the grill 109 is placed) is also pulled out to the front of the grill heating chamber 9 together with the drawer operation. Since the tray 108 is supported by simply placing the left and right ends on a metal rail, the tray 108 can be detached from the rail alone.

  Further, the shape of the grill 109 and the position and shape of the tray 108 are devised so that they cannot be pulled out by hitting the lower heater 23 when the tray 108 is pulled forward. In this manner, in the grill heating chamber 9, if meat, fish, or other food is placed on the grill 109 and the radiant electric heating sources 22 and 23 are energized (simultaneously or in a time-sharing manner), the food is moved up and down. It has a “double-sided baking function” for heating from both sides. The grill heating chamber 9 is provided with an internal temperature sensor 242 (see FIG. 25) for detecting the indoor temperature, and cooking can be performed while maintaining the internal temperature at a desired temperature. ing.

  As shown in FIG. 18, the grill heating chamber 9 has a cylindrical metal inner frame 9C having an opening 9B on the entire rear (back) side and an opening 9A on the front side, and the entire outside of the inner frame. The outer frame 9D covers a predetermined (lower) gap 113, an (upper) gap 114, and left and right side gaps (115, not shown). In FIG. 18, reference numeral 307 denotes a gap formed between the outer frame 9 </ b> D of the grill heating chamber 9 and the bottom wall surface of the main body case 2.

  The outer frame 9D has five surfaces, that is, left and right side wall surfaces, an upper surface, a bottom surface, and a rear surface, and is entirely formed of a steel plate or the like. The inner surfaces of the inner frame 9C and the outer frame 9D form a coating with good cleanability such as enamel, a heat-resistant coating film, or an infrared radiation film. When an infrared radiation film is formed, the amount of infrared radiation with respect to the object to be heated N such as food is increased, heating efficiency is improved, and uneven baking is also improved. 9E is an exhaust port formed in the upper part of the back wall surface of the outer frame 9D.

The metal exhaust duct 14 is installed so as to be continuous with the outside of the exhaust port 9E, and the cross section of the flow path of the metal exhaust duct 14 is square or rectangular, as shown in FIG. The upper end opening 14 </ b> A communicates to the vicinity of the central vent 20 </ b> C formed in the upper frame 20.
A deodorizing catalyst 121 is installed in the exhaust duct 14 at a position downstream of the exhaust port 9E, and is activated by being heated by a catalyst electric heater (121H). It works to remove odorous components from the hot exhaust inside.

(Exhaust structure / intake structure)
As described above, the rear portion of the upper frame 20 is formed with a right ventilation port (becomes an intake port) 20B, a central ventilation port (becomes an exhaust port) 20C, and a left ventilation port 20D that are long and wide. On these three rear vents, a metal plate-like cover 132 (see FIG. 13) in which countless small communication holes are formed so as to cover the entire upper part is detachably mounted. The cover 132 may be a metal mesh or a fine lattice shape in addition to a metal plate formed with small holes for communication holes by press working (also referred to as punching metal). In any case, it is only necessary that the user's finger or a foreign object does not enter the ventilation openings 20B, 20C, 20D from above.

  The suction port 37B at the top of the suction cylinder 37A of the fan case 37 faces directly below the right end of the cover 132, and external indoor air such as a kitchen is passed through the communication hole of the cover 132 in the main body A. It can be introduced into the left and right cooling chambers 8R, 8L.

  As shown in FIG. 14, the upper end of the exhaust duct 14 is located in the rear exhaust chamber 12. In other words, the rear exhaust chamber 12 communicating with the gap 116 (see FIG. 18) formed around the grill heating chamber 9 is secured on both the left and right sides of the exhaust duct 14. The grill heating chamber 9 is installed with a predetermined gap 116 between the horizontal partition plate 25 (see FIG. 18). This gap 116 finally communicates with the rear exhaust chamber 12. Yes. As described above, since the interior of the upper part chamber 10 communicates with the rear exhaust chamber 12 through the pair of exhaust ports 28A formed in the rear partition plate 28, the cooling air flowing in the upper part chamber 10 (see FIG. 17). The arrow Y5) is discharged to the outside of the main body 1 as indicated by the arrow Y9 in FIG. 14. At this time, the air inside the gap 116 is also discharged by being attracted by this.

(Auxiliary cooling structure)
16 and 17, the front part case 46 is a mounting board to which various electric / electronic parts 57 of the upper surface operation part 61 and a light emitting element (LED) for displaying the heating power during induction heating cooking are attached and fixed. 56 is comprised of a transparent plastic lower duct 46A having an open upper surface and a transparent plastic upper duct 46B that serves as a lid for sealing the upper surface opening of the lower duct 46A. ing. Ventilation holes 46R and 46L are opened at the right end and the left end of the lower duct 46A, respectively, and a notch 46C that allows ventilation is formed at the center rear.

  On the ceiling surface of the upper duct 46B, the integrated display means 100 is installed in the center, and the liquid crystal display screens 45R and 45L are installed on the left and right sides (see FIG. 17). The cooling air of the blower 30 enters the ventilation space 42H of the cooling duct 42 from the second exhaust port 34B of the component case 34, and from there through the ventilation port 42K formed corresponding to the ventilation space 42H, the liquid crystal display screen 45R, It enters the front part case 46 from below 45L and is discharged to the upper part chamber 10 from the notch 46C. Accordingly, the liquid crystal display screens 45R and 45L and the integrated display unit 100 are always cooled by the cooling air from the blower 30.

  In particular, since the cooling air from the second exhaust port 34B of the component case 34 is not the air that has cooled the left and right IH heating coils 6LC and 6RC that become high during the induction heating operation, the temperature is low, and the liquid crystal display screens 45R and 45L In addition, both the integrated display unit 100 can effectively suppress the temperature rise while the amount of cooling air is small. In particular, since the rear positions of the left and right IH heating coils 6LC and 6RC that are located downstream in the flow of cooling air (arrow Y5 in FIG. 17) are difficult to cool, in this embodiment, the first exhaust port 34A is connected to the ventilation space 42F. The low temperature wind is directly supplied to cool the part.

(Auxiliary exhaust structure)
As shown in FIG. 18, a cylindrical bottom portion 14 </ b> B having a shape recessed downward by one step is formed on the downstream side of the deodorizing catalyst 121 in the exhaust duct 14. The vent hole 14C is formed in the cylindrical bottom portion 14B. The blower 106 is an axial-flow type blower for auxiliary exhaust facing the air hole 14 </ b> C, 106 </ b> A is a rotor blade, 106 </ b> B is a drive motor that rotates the rotor blade 106 </ b> A, and is supported by the exhaust duct 14. While cooking in the grill heating chamber 9, the grill heating chamber 9 becomes hot, so the internal atmospheric pressure naturally rises, and accordingly, the high temperature atmosphere is discharged and the exhaust duct 14 rises. When the air inside the main body A is taken into the exhaust duct 14 as shown by an arrow Y7, the hot air in the grill heating chamber 9 is attracted to the fresh air, and the upper end of the exhaust duct 14 is lowered while the temperature is lowered. The air is exhausted from the opening 14A as indicated by an arrow Y8.

  The auxiliary exhaust axial flow fan 106 is not always operated during operation of the cooker, and is operated when cooking is performed in the grill heating chamber 9. This is because hot air is discharged from the grill heating chamber 9 to the exhaust duct 14 in this case. Further, the air flows Y7 and Y8 in FIG. 18 and the air flows Y1 to Y5 in FIG. 17 are not related at all and are not continuous flows.

(Control means F)
The control means (control part) F of the heating cooker in this embodiment is mainly composed of an energization control circuit 200.
FIG. 25 is a component diagram showing the entire control circuit of the heating cooker, and this control circuit is formed by an energization control circuit 200 configured by incorporating one or a plurality of microcomputers. The energization control circuit 200 includes four parts, an input unit 201, an output unit 202, a storage unit 203, and an arithmetic control unit (CPU) 204, and is connected to a direct current via a constant voltage circuit (not shown). A power source is supplied to serve as a central control means for controlling all the heating sources and the display means G. In FIG. 25, an inverter circuit 210R for the second induction heating unit 6R is connected to a commercial power supply of 100V or 200V voltage via a rectifier circuit (also referred to as a rectifier bridge circuit) 221.

  Similarly, in parallel with the inverter circuit 210R for the second induction heating unit 6R, the basic configuration of the right heating coil 6RC (induction heating coil) shown in FIG. 25 is similar to that for the first induction heating unit 6L. An inverter circuit 210L is connected to the commercial power supply via the rectifying bridge circuit 221. That is, the left heating coil 6LC includes a rectifier bridge circuit 221 whose input side is connected to the bus of the commercial power supply, a DC circuit including the coil 222 and the smoothing capacitor 223 connected to the DC side output terminal, and the coil 222 and the smoothing circuit. A resonance circuit composed of a parallel circuit of the right side heating coil 6RC and the resonance capacitor 224, one end of which is connected to the connection point of the condenser capacitor 223, and an IGBT 225 serving as switching means having the collector side connected to the other end of the resonance circuit. I have.

  The inverter circuit 210L for the first induction heating unit 6L is greatly different from the inverter circuit 210R for the second induction heating unit 6R in that it has a main heating coil MC and a sub-heating coil SC. Therefore, the inverter circuit 210L for the first induction heating unit 6L includes a main inverter circuit MIV for a main heating coil that supplies power to both the inner coil LC2 and the outer coil LC1, that is, the main heating coil MC, It consists of sub-inverter circuits SIV1-SIV4 for sub-heating coils that individually supply power to four independent sub-heating coils SC1-SC4 described later. The energization timings and energization amounts of the four sub-heating coils SC <b> 1 to SC <b> 4 are all determined by the energization control circuit 200.

  Since the main inverter circuit MIV for the main heating coil adopts a variable frequency output control system, the inverter power, that is, the obtained thermal power can be made variable by changing the frequency. When the drive frequency of the main inverter circuit MIV is set higher, the inverter power decreases, the loss of circuit / electrical elements such as the switching means (IGBT) 225 and the resonant capacitor 224 increases, and the amount of heat generation also increases. Since the increase is not preferable, a predetermined upper limit frequency is determined and controlled to be changed below that. The electric power that can be controlled continuously at the upper limit frequency is the lowest electric power, but when applying lower electric power, the energization is intermittently performed. it can. The sub-inverter circuits SIV1 to SIV4 for the sub-heating coil can be controlled in the same manner.

  The drive frequency used for driving the main inverter circuit MIV is basically the same as the drive frequency of the sub inverter circuits SIV1 to SIV4 for the sub heating coil. When changing, the energization control circuit 200 controls the difference between the drive frequencies so as not to fall within the range of 15 to 20 kHz so that the difference between the drive frequencies is not in the audible frequency range. This is because when two or more induction heating coils are driven simultaneously, an unpleasant sound such as a beat sound or an interference sound is caused by the difference in frequency.

  The main inverter circuit MIV and the sub-inverter circuits SIV1 to SIV4 for the sub-heating coil need not always be driven at the same time. For example, depending on the thermal power commanded by the energization control circuit 200, the main inverter circuit MIV is alternately heated at short time intervals. You may switch so that operation may be performed. Here, “simultaneously” refers to the case where the energization start timing and the energization stop timing are exactly the same.

  212 is a heater driving circuit for driving the radiant electric heating source 22 for heating the inside of the grill heating chamber 9; 213 is a heater driving circuit for driving the radiating electric heating source 23 for heating the inside of the grill heating chamber 9; 214 Is a heater drive circuit for driving the catalyst heater 121H provided in the middle of the exhaust duct.

  In FIG. 31, reference numeral 215 denotes a display unit driving circuit for driving the display screen 100 of the integrated display means. The display unit driving circuit 215 is configured in the same manner as in the first embodiment, and includes a power source 215D, an interface 215C, a display memory 215A, a display controller 215B, a common driver 215E, and a segment driver 215F. The display unit driving circuit 215 is different from the first embodiment in that the right liquid crystal display unit 45R, the left liquid crystal display unit 45L, and the left and right thermal power display units 101R and 101L are also intensively controlled. In FIG. 31, 70 is the above-described right operation unit, 71 is a left operation unit, 72 is a central operation unit, 63 is a main power switch, and 60 is a front operation unit.

  The emitter of the IGBT 225 is connected to a common connection point between the smoothing capacitor 223 and the rectifying bridge circuit 221. The flywheel diode 226 is connected between the emitter and collector of the IGBT 225 so that the anode is on the emitter side.

  The current detection sensor 227 detects a current flowing through a resonance circuit composed of a parallel circuit of the right heating coil 6RC and the resonance capacitor 224R. The detection output of the current detection sensor 227 is input to a heated object placement determination unit 280, which will be described later, via which the determination information as to whether the heated object N is present at the input part of the energization control circuit 200 is supplied. The presence determination of the heated object N is performed. In addition, when a pan that is inappropriate for induction heating is used, or when an undercurrent or overcurrent that is more than a predetermined value compared to the normal current value is detected due to some accident, etc. The IGBT 225 is controlled by the energization control circuit 200 via the drive circuit 228, and the energization of the induction heating coil 220 is stopped instantaneously.

  Similarly, the main inverter circuit MIV for the main heating coil and the sub-inverter circuits SIV1 to SIV4 for the sub-heating coils that individually supply power to the four independent sub-heating coils SC1 to SC4 are respectively connected to the second induction circuit. Since the circuit configuration is the same as that of the inverter circuit 210R of the heating unit 6R, a description thereof will be omitted, but the common circuit configuration is collectively shown as an inverter circuit 210L of the left induction heating source 6L in FIG.

  In FIG. 23, 6LC is a left side heating coil, and 224L is a resonance capacitor. Even in the main inverter circuit MIV of the main heating coil MC, one end is connected to the connection point of the rectifying bridge circuit 221, the DC circuit composed of the coil 222 and the smoothing capacitor 223, and the coil 222 and the smoothing capacitor 223. A resonance circuit composed of a parallel circuit of the coil MC and the resonance capacitor 224 and an IGBT 225 serving as switching means having a collector connected to the other end of the resonance circuit are connected.

  Although not shown, the current detection sensor 227 is similarly provided in the inverter circuits 210L and 210M of the first induction heating unit 6L and the third induction heating unit 6M. The current detection sensor 227 includes a shunt that measures current using a resistor and a method that uses a current transformer.

  The drive circuit 260 drives the main inverter circuit MIV for the main heating coil, and plays the same role as the drive circuit 228. Similarly, the drive circuits 261 to 264 drive the sub inverter circuits SIV1 to SIV4 for the sub heating coil, respectively.

  The current detection sensor 266 detects a current flowing in a resonance circuit composed of a parallel circuit of the main heating coil MC and a resonance capacitor (not shown). Similarly, the current detection sensors 267A, 267B, 267C (not shown), 267D (not shown) detects a current flowing in a resonance circuit composed of a parallel circuit of the sub-heating coil SC and a resonance capacitor (not shown). These current sensors 266, 267A, 267B, 267C and 267D play the same role as the current detection sensor 227. The current sensor on the resonance circuit side as described above is called an output-side current sensor. On the other hand, it is called an input-side current sensor on the commercial power supply (AC power supply) 75 side from a rectifier circuit 76 of a DC power supply unit 80 described later. A current sensor is provided, and the current value is monitored by both the input side and output side current sensors to monitor the operation and abnormal state of the resonance circuit.

  In the heating cooker that heats the object N to be heated by the induction heating method as in the present invention, electric power for supplying high-frequency power to the first and second induction heating units 6L and 6R and the third induction heating unit 6M. The control circuit is called a so-called resonant inverter. A switching circuit element (IGBT, 225 in FIG. 25) is connected to a circuit in which the inductances of the left and right heating coils 6LC, 6RC, 6MC including the object to be heated N (metal object) and the resonance capacitors (224L, 224R in FIG. 25) are connected. ) With on / off control at a drive frequency of about 20 to 40 KHz. The inverter circuit 210M of the third induction heating unit 6MC has the same configuration as the inverter circuit 210R of the second induction heating unit 6R. That is, the inverter circuit 210M of the third induction heating unit 6M is connected in parallel with the inverter circuit 210R for the second induction heating unit 6R via a rectification bridge circuit (not shown) similar to the rectification bridge circuit 221. Connected to the commercial power source.

  Further, the resonance type inverter includes a current resonance type which is said to be suitable for a 200V power supply and a voltage resonance type which is said to be suitable for a 100V power supply. Depending on how the connection destination of the left and right heating coils 6LC, 6RC and the resonant capacitors 224L, 224R is switched by a relay circuit, such a resonant inverter circuit has a so-called half-bridge circuit and full-bridge circuit. Divided into called methods.

  When the object to be heated is induction-heated using a resonant inverter circuit, if the object to be heated N is a magnetic material such as iron or magnetic stainless steel, the resistance component (equivalent resistance) that contributes to heating is large and power is input. However, when the object to be heated N is a magnetic material such as aluminum, the equivalent resistance is small, and the eddy current induced in the object to be heated N is hardly changed to Joule heat. For this reason, when it is determined that the material of the object to be heated N is a magnetic material, the inverter circuit configuration is automatically changed to the half-bridge method, and in the case of the object to be heated N using a magnetic material, the full bridge is used. It is known to perform control of switching to a method (for example, Japanese Patent Laid-Open Nos. 5-251172, 9-185986, and 2007-80751). Unless otherwise specified in the present invention, the inverter circuits 210R and 210L may be constituted by a half bridge circuit or a full bridge circuit.

  FIG. 25 uses a half-bridge resonance type inverter circuit for the sake of simplicity, but a full-bridge circuit such as that shown in FIGS. 26 and 27 is desirable to actually implement the present invention. .

  Describing more specifically with reference to FIGS. 26 and 27, the cooking device has a power supply unit (power supply circuit) 74. The power supply unit 74 includes a DC power supply unit 80, a main inverter circuit MIV, and four sub inverter circuits SIV1 to SIV4. In FIG. 26, only two main inverter circuits MIV and sub inverter circuit SIV1 are shown, but three sub inverter circuits SIV2 to SIV4 having the same configuration as sub inverter circuit SIV having connection points CP1 and CP2 are shown. Are connected in parallel to the energization control circuit 200 as shown in FIG. That is, similarly to the sub inverter circuit SIV1, the connection points CP3, CP4, CP5, CP6, and CP7 at both ends of the other three sub inverter circuits SIV2, SIV3, and SIV4 are connected to the circuits of the connection points CP1 and CP2, respectively. ing. A drive circuit having the same function as the drive circuits 228A and 228B shown in FIG. 26 is connected to the three sub inverter circuits SIV2 to SIV4. The drive circuits 228A and 228B will be described in detail later.

  As is clear from the above description, the four sub inverter circuits SIV1 to SIV4 are configured to be connected in parallel to the DC power supply unit 80 and the energization control circuit 200, respectively.

The DC power supply unit 80 is connected to an AC power supply 75. The AC power source 75 is a single-phase or three-phase commercial AC power source. The AC power source 75 is connected to a rectifier circuit 76 that full-wave rectifies the AC current output from the AC power source 75. The rectifier circuit 76 is connected to a smoothing capacitor 86 that smoothes the DC voltage that has been full-wave rectified by the rectifier circuit.
The main inverter circuit MIV and the four sub-inverter circuits SIV1 to SIV4 are full-bridge inverters that convert alternating current into direct current and then convert this direct current into high frequency alternating current. Each Invar circuit MIV, SIV1 to SIV4 is connected to the DC power supply unit 80 of the power supply unit 74.

  The main inverter circuit MIV and the sub inverter circuit SIV1 each have two pairs of switching elements (also referred to as a pair) 77A, 78A, 77B, 78B. As shown in the figure, the pair of switching elements 77A and 78A of the main inverter circuit MC have two switching elements 79A, 81A and 88A, 89A connected in series, respectively. The pair of switching elements 77B and 78B of the sub inverter circuit SIV1 has two switching elements 102B, 103B and 104B, 105B connected in series, respectively. Although not shown, the sub-inverter circuits SIV2, SIV3, and SIV4 shown in FIG. 25 each include the two sets of switching elements as described above. The drive timing of the two pairs of switching elements 77A and 78A of the main inverter circuit MIV is controlled by the drive circuits 228A and 228B, and the amount of current flowing through the main heating coil MC can be adjusted by controlling the phase difference. .

  The main heating coil MC and a series resonance circuit including the resonance capacitor 110A are connected between the output points of the switching elements 79A and 81A and between the output points of the switching elements 88A and 89A. A series resonance circuit including the sub-heating coil SC1 and the resonance capacitor 110B is connected between the output points of the switching elements 102B and 103B and between the output points of the switching elements 104B and 105B. Similarly, although not shown, a series resonant circuit including sub-heating coils SC2 to SC4 and a resonant capacitor (not shown) 110A is similarly connected to the other three sub-inverter circuits SIV2, SIV3, and SIV4. Yes.

  Drive circuits 228A and 228B are connected to the two pairs of switching elements 77A and 78A of the main inverter circuit MIV, respectively. Drive circuits 228C and 228D are connected to the two pairs 77B and 78B of the switching elements of the sub inverter circuit 1. Drive circuits 228E, 228F, 228G, 228H, 228I, and 228J (all not shown) are also connected to the remaining three sub inverter circuits SIV2 to SIV4, respectively. All these drive circuits 228 </ b> A to 228 </ b> J are connected to the heated object placement determination unit 280 via the energization control circuit 200.

  In this embodiment, various switching circuit elements, for example, IGBT 225 shown in FIG. 23 and switching elements 77A, 81A, 88A, 89A, 102B, 103B, 104B, and 105B shown in FIG. 26 are formed of silicon. You may form with a wide band gap semiconductor with a large band gap compared with silicon. Examples of wide band gap semiconductors include silicon carbide, gallium nitride-based materials, diamond, and gallium nitride (GaN). Switching elements and diode elements formed by such wide band gap semiconductors have high voltage resistance and high allowable current density, so that switching elements and diode elements can be miniaturized. By using elements and diode elements, it is possible to reduce the size of a semiconductor module incorporating these elements.

  Further, since the heat resistance is high, the heat radiation fins of the heat sink can be downsized and the water cooling part can be air cooled, so that the semiconductor module can be further downsized.

  Furthermore, since the power loss is low, it is possible to increase the efficiency of the switching element and the diode element, and further increase the efficiency of the semiconductor module.

  As shown in FIG. 17, an inverter circuit 210 </ b> R for the second induction heating unit 6 </ b> R and a third induction heating unit are provided inside one component case 34 installed in the right cooling chamber 8 </ b> R inside the main body case 2. The circuit board 41 on which the 6M inverter circuit 210M is mounted is installed, but as described above, this can be realized more easily than before by using a switching element or a diode element formed of a wide band gap semiconductor. . That is, since the wide band gap semiconductor has high heat resistance, it is possible to reduce the size of the radiating fins 43A and 43B. As a result, the installation space of the circuit board 41 can also be reduced, and the right cooling chamber 8R of the main body case 2 can The cooling unit CU can be installed. Temporarily, the inverter circuit 210R for the second induction heating unit 6R and the inverter circuit 210M for the third induction heating unit 6M cannot be mounted on one circuit board 41, and are configured by two circuit boards 41. Even if this happens, it is not necessary to increase the size of the component case 34 for storing these circuit boards, so there is no need to increase the space of the cooling chamber 6R. As a result, the space of the upper component chamber (component storage chamber) 10 is reduced. A plurality of induction heating coils including a heating coil having a large outer diameter such as the first induction heating source 6L can be installed side by side.

  Although both the switching element and the diode element are preferably formed of a wide band gap semiconductor, either one of the elements may be formed of a wide band gap semiconductor to obtain the above-described effect. Can do.

  The energization control circuit 200 has a function of making the frequency of the switch drive signal output to the main inverter circuit MIV and all the sub inverter circuits SIV1 to SIV4 the same.

  With the above configuration, when the user turns on the main power supply through the front operation unit 60 and then commands the energization control circuit 200 to start heating driving through the upper operation unit 61 or the front operation unit 60, the output of the AC power supply 75 is output. Each of the drive circuits 228A, 228B, 228C, 228D (the description of the operation of the other drive circuits is omitted) based on a command signal (switch drive signal) output from the energization control circuit 200 after being converted to direct current by the DC power supply unit 80. Drive signal is issued. Then, switching elements 79A, 89A and 81A, 88A, switching elements 102B, 105B, 103B, and 104B are alternately turned on and off, respectively, and the direct current is converted again into high-frequency alternating current, and main heating coil MC and sub-heating coil SC1. A high frequency current is applied to. Thereby, induction heating operation is started. The frequency of the switch drive signal output from the energization control circuit 200 to the main inverter circuit MIV and the sub inverter circuit SIV1 is automatically set to be equal.

With the above configuration, the energization control circuit 200 has four sub-heating coils SC1 to SC4 in a region adjacent to each other (outer peripheral region of the main heating coil) when a clockwise high-frequency current is passed through the main heating coil MC. Has a function of controlling the main inverter circuit MIV and the sub-inverter circuits SIV1 to SIV4 so that the high-frequency current IB applied to and the high-frequency current IA flowing through the main heating coil MC flow in the same direction (counterclockwise direction).
On the contrary, when the high-frequency current IA in the counterclockwise direction flows through the main heating coil MC, the high-frequency current IB applied to the sub-heating coils SC1 to SC4 flows in the same direction (clockwise direction) in the adjacent regions. The main inverter circuit MIV and all the sub inverter circuits SIV1 to SIV4 are controlled. As described above, this can suppress the generation of abnormal noise due to the difference in frequency.

  As described above, when the object to be heated N is induction-heated by energizing the left and right heating coils 6LC and 6RC, if the object to be heated N is made of a magnetic material such as iron, the heating coils 6LC and 6RC resonate. A switching circuit element (IGBT, 225 in FIG. 25, 225. In FIG. 26, switching elements 77A, 81A, 88A, 89A, 102B, 103B) are connected to a resonance circuit to which capacitors (224L, 224R in FIG. 25, 110A and 110B in FIG. 26) are connected. 104B, 105B) may be controlled to be turned on / off at a driving frequency of about 20 to 40 kHz, and a current of about 20 to 40 kHz may be supplied.

  On the other hand, when the object N to be heated is made of a material having high electrical conductivity such as aluminum or copper, a large current is passed through the left and right IH heating coils 6LC and 6RC in order to obtain a desired heating output. It is necessary to induce a large current on the bottom surface of the heated object N. For this reason, in the case of an object to be heated N made of a material having high electrical conductivity, on / off control is performed at a driving frequency of 60 to 70 kHz.

  In FIG. 25, a motor drive circuit 33 is a drive circuit of the drive motor 300 of the blower 30 for keeping the internal space of the main body A in FIG. 13 within a certain temperature range, and the motor drive circuit 231 is connected to the exhaust duct 14. It is a drive circuit of drive motor 106B of installed fan 106.

(Temperature detection circuit)
In FIG. 25, temperature detection information from the following temperature detection elements is input to the temperature detection circuit 240.
(1) A temperature detection element 31R provided in the approximate center of the right heating coil 6RC.
(2) A temperature detection element 31L provided at the center of the left heating coil 6LC.
(3) A temperature detection element 241 provided in the vicinity of the heating coil of the third induction heating unit 6M.
(4) A temperature detection element 242 for detecting the internal temperature of the grill heating chamber 9.
(5) A temperature detection element 243 installed in the vicinity of the integrated display means 100.
(6) Temperature detecting elements 244 and 245 which are attached in close contact with the two radiating fins 43A and 43B inside the component case 34 and detect the temperatures of the two radiating fins individually.

  Two or more temperature detection elements may be provided for the temperature detection object. For example, the temperature sensor 31R of the second induction heating unit 6R may be provided in the central part and the outer peripheral part of the heating coil 6RC to achieve more accurate temperature control. Further, the temperature detection element may be configured by using a different principle. For example, the temperature detecting element at the center of the right heating coil 6RC may be an infrared type, and the one provided at the outer peripheral part may be a thermistor type.

  The control circuit 200 always controls the motor drive circuit 33 of the drive motor 300 of the blower 30 according to the temperature measurement situation from the temperature detection circuit 240 so that each temperature measurement portion does not become higher than a predetermined temperature. It is cooled by wind by driving.

  The temperature detection element 31L provided at the center of the left heating coil 6LC is composed of five temperature detection elements 31L1 to 31L5, which will be described in detail later.

(Sub heating coil)
21 and 23, the outer coil 6LC1 of the left heating coil 6LC is an annular coil having a center point X1 and a maximum outer diameter DA (= twice the radius R1), and the inner coil 6LC2 is an outer coil 6LC1. Is a coil wound in an annular shape with a space 270 inside, and has the same center point X1. The main heating coil MC is composed of two annular coils on such concentric circles.

  The four sub-heating coils SC1 to SC4 are arranged on the outer peripheral surface of the main heating coil MC while maintaining a predetermined space 271 and, as shown in FIG. 23, the same circumference with a radius R2 centered on the center point X1. They are curved along the top and are arranged so as to be scattered at substantially equal intervals, and the outer shape thereof is a curved oval or oval shape as shown in FIGS. These sub-heating coils SC1 to SC4 are also wound while twisting one or a plurality of assembly wires and partially restricted by a binding tool such as an insulating tape so that the outer shape becomes an oval or oval shape, or the whole Is formed so as to maintain a predetermined shape by being hardened with a heat resistant resin or the like.

  As shown in FIG. 23, the circumferential line from the center point X1 to the radius RY coincides with the center line in the longitudinal direction of each of the sub-heating coils SC1 to SC4. In other words, around the annular main heating coil MC constituting one closed circuit, an arc drawn with a radius RX from the center point X1 of the main heating coil MC is inside (facing the outer periphery of the main heating coil MC). Four sub-heating coils SC1 to SC4 are arranged so as to be formed on the side). Each of the sub-heating coils SC1 to SC4 is bent with a radius of curvature RX and electrically forms a closed circuit. Note that twice the radius RY (circle diameter) corresponds to the dimension CW1 in the first embodiment shown in FIG.

  The height dimension (thickness) of the main heating coil MC and the height dimension (thickness) of each of the sub-heating coils SC1 to SC4 are the same, and the distance between the upper surface and the lower surface of the top plate 21 is the same dimension. It is installed and fixed horizontally on a coil support 290 to be described later.

  A straight line Q1 shown in FIG. 21 is a straight line connecting the inner curved edges of the four sub-heating coils SC1 to SC4, in other words, one end RA of the curved arc (in other words, the starting point) and the center point X1. Similarly, the straight line Q2 is a straight line connecting the other end RB (in other words, the end point) of the arc of the sub-heating coils SC1 to SC4 and the center point X1. The length between the two ends RA and RB (between the start point and the end point), that is, the length of the arc (of the sub-heating coil SC) that is curved with a radius RX along the outer peripheral surface of the main heating coil MC is large. It is desirable from the viewpoint of heating efficiency. This is because, as will be described later, the high-frequency current flows in the same direction between the outer peripheral edge of the main heating coil MC and the sub-heating coils SC1 to SC4 so as to reduce magnetic interference.

  However, in reality, the direction of the high-frequency current is opposite between the two adjacent sub-heating coils SC1 to SC4, and the influence of this becomes a problem. In order to suppress this influence, a certain distance (a space 273 described later) is separated. For this reason, the length of the arc has a certain limit.

Next, the dimensional relationship of the heating coil 6LC of the left induction heating source 6L shown in FIGS. 21 and 23 will be described.
Outer diameter DA of main heating coil MC (twice R1): about 130mm
Radius R1 of main heating coil MC: about 65mm
Curvature radius RX inside sub-heating coil SC: about 50 mm
The width of the space 271: 5 mm
The width of the space 272: 10 mm
Average width W31 of the entire assembly line outside the sub-heating coil SC: 10 mm
Circle radius RX: 70mm
Maximum outer diameter DB of the heating coil 6LC: about 200 mm
Width of space 273: 15 (30 mm if space 271 is 10 mm)

Specifically, in the case shown in FIGS. 21 and 23, if the space 271 serving as the electrical insulation distance between the main heating coil MC and the sub-heating coils SC1 to SC4 is 5 mm, the following dimensions are calculated. Is required.
Outer diameter DA of main heating coil MC: about 130mm (equivalent to twice R1)
RX circumference length: about 440 mm (= RX × circumference 3.14)
Therefore, when four sub-heating coils SC1 to SC4 are arranged equally (at an angle of 90 degrees), the length of a quarter of the circumference is about 110 mm.

  The angle formed by Q1 and Q2 shown in FIG. 22 is not 90 degrees, but is, for example, 60 degrees to 75 degrees. Therefore, in the case of 70 degrees, the above-mentioned about 110 mm is about 86 mm from the formula of 70 degrees ÷ 90 degrees (about 0.778) × 110 mm. That is, the length of the innermost arc of each of the sub-heating coils SC1 to SC4 is about 86 mm.

  When the number of sub-heating coils SC is four as in the second embodiment, a range of 280 degrees (= 4 times the above-mentioned 70 degrees) is 360 degrees around the main heating coil MC. Since it is a circular arc (of the secondary heating coil SC) curved along the surface (with a radius of curvature RX), it is about 77.8% (= 280 ° ÷ 360 °) (this rate is referred to as “match rate” in the following description) It can be said that the directions of the outer peripheral edge of the main heating coil MC and the inner peripheral edges of the sub-heating coils SC1 to SC4 match (in parallel). This means that the high-frequency currents IA and IB can be made to flow in the same direction between the main heating coil MC and the sub-heating coils SC1 to SC4, which reduces the magnetic interference and is heated. This contributes to increasing the magnetic flux density for the object N and increasing the heating efficiency.

  In FIG. 21 and FIG. 23, the size of each component such as the main heating coil MC and the sub-heating coils SC1 to SC4 is not drawn to scale for easy understanding. The larger the match rate, the higher the high-frequency current flows in the same direction, and the length in which the magnetic flux density is increased in the adjacent region of the two heating coils is large, which is desirable from the viewpoint of heating efficiency, but actually, in order to secure the space 273 There is a limit and the match rate cannot be 100%.

  In FIG. 23, the radius RY of a perfect circle centering on the center point X1 and passing through the centers of the four sub-heating coils SC is obtained from the widths of RX, W31, and the space 272, and is about 85 mm. In this case, the diameter of the circle including the four sub-heating coils, SC1 to SC4, in other words, the maximum outer diameter DB of the heating coil 6LC of the first induction heating source 6L is about 200 mm.

The space 271 may be, for example, 10 mm instead of the minimum dimension of 5 mm. In this case, RY is about 90 mm.
The space 271 is an insulating space necessary for maintaining insulation between the two objects, ie, the main heating coil MC and the sub-heating coils SC1 to SC4, to which high-frequency currents are respectively supplied from different inverter circuits. If an electrical insulator such as porcelain or heat-resistant plastic is interposed in a thin plate shape so as to block between the MC and the sub-heating coils SC <b> 1 to SC <b> 4, the electrical insulation of the space 271 is improved. The dimensions can be further reduced.

  Each of the sub-heating coils SC1 to SC4 improves the magnetic driving force per unit plane area as compared with the main heating coil MC and outputs a high output even if the plane area is small. Thin wire may be used.

  The space (cavity) 272 can be naturally formed when the sub-heating coils SC1 to SC4 are formed. That is, it is inevitably formed when the assembly line is wound around the jig in a certain direction. This space 272 is used when the sub-heating coils SC <b> 1 to SC <b> 4 themselves are air-cooled, and the air-cooling air supplied from the blower 30 rises through this space 272. The coil support 290 is integrally formed of a non-metallic material such as a heat-resistant plastic, and has a circular shape in which eight arms 290B extend radially from the center point X1 and the outermost peripheral edge 290C is connected. It has a shape.

  When the infrared sensors 31L1 to 31L5 are respectively held, the five support portions 290D1 to 290D5 are attached to the upper surface or the side surface of the arm 290B as an integrated or separate component (see FIG. 24). The supporting protrusion 290A is integrally formed with four arms 290B that face the central portion of the sub-heating coils SC1 to SC4 among the eight arms 290B extending radially. Are provided in such a manner that one of them enters the space 272 of the sub-heating coils SC1 to SC4 and one of the remaining two is from the sub-heating coils SC1 to SC4. Near the center point X1, the other is arranged outside.

  Two support tongues 290E are integrally formed on each of four arms 290B that face both ends of the sub-heating coils SC1 to SC4, and on both ends of the sub-heating coils SC1 to SC4. The center portion of the sub-heating coils SC1 to SC4 is placed on the upper surfaces of the other two arms 290B.

  The columnar fixing portion 290F is formed integrally and projecting one by one on all the upper surfaces of the support tongue 290E, and this fixing portion 290F has a space 272 when the sub-heating coils SC1 to SC4 are installed. It is positioned at a position corresponding to the both end positions. Because of the fixed portion 290F and the supporting projection portion 290A, the sub-heating coils SC1 to SC4 are restricted in the position of the central space 272 and the inner and outer positions. It is not deformed by the accompanying expansion force (typically, arrows FU and FI indicated by a one-dot chain line in FIG. 24).

  The supporting protrusion 290A and the fixing portion 290F are used to restrict the position of the auxiliary heating coils SC1 to SC4 by partially contacting the inside and the periphery of the sub-heating coils SC1 to SC4 and surround the entire circumference of the coil (ribs). The reason why it is not formed is that the inside and the periphery of the sub-heating coils SC1 to SC4 are opened as much as possible to provide a passage for cooling air.

  The coil support 290 is placed on the upper surface of the upper case 42A of the cooling duct 42 as shown in FIGS. 24 and 29, and is cooled by cooling air that is blown upward from the blow holes 42C of the cooling duct 42. The main heating coil MC and the sub-heating coils SC1 to SC4 thereabove are cooled so as not to become abnormally high temperature due to heat generation. Therefore, the coil support 290 is substantially in a lattice shape (see FIG. 24) that can ensure air permeability, and the magnetic flux leakage prevention material 73 arranged radially from the center point X1 passes through the wind passage. It has a shape that partially crosses. In addition, since the bottom surfaces of the sub-heating coils SC1 to SC4 are also exposed except for a portion of the arm 290B and the support tongue 290E that are opposed to each other, the heat dissipation effect is improved by the presence of the exposed portions.

  The magnetic flux leakage prevention material 73 is attached to the lower surface of the coil support 290 so as to be radial from the center point X1. When the adjacent sub-heating coils SC1 to SC4 are energized at the same time as shown in FIG. 23, the space 273 is adjacent to the ends of the adjacent sub-heating coils SC1 to SC4 when the high-frequency current IB flowing therethrough is in the same direction. Is provided so as not to interfere magnetically. That is, for example, when a driving current is supplied to the annular main heating coil MC in a counterclockwise direction as viewed from above, the main heating coil is supplied with a driving current in the clockwise direction in the sub-heating coils SC1 to SC4. The direction of the high-frequency current IA flowing through the MC and the direction of the current IB flowing through the sub-heating coils SC1 to SC4 on the side close to the main heating coil MC, that is, the adjacent side, are the same as shown in FIG. Among the SC1 to SC4, the directions of the high-frequency current IB are opposite to each other between the adjacent ends, so that magnetic interference due to this is reduced.

  For example, during a period in which the drive current is supplied to the main heating coil MC in the clockwise direction as viewed from above, the drive current is supplied to the sub-heating coils SC1 to SC4 in the counterclockwise direction, and then clockwise. Alternatively, the direction of the current may be switched in the opposite direction alternately at predetermined time intervals, such as causing a drive current to flow through.

  It is desirable that the size of the space 273 between the end portions of the sub-heating coils SC1 to SC4 is larger than the space 271. It is desirable that the transverse dimension on the straight line passing through the center point X1 of the space (cavity) 272 in the sub-heating coils SC1 to SC4, that is, the width dimension as indicated by an arrow in FIG. This is because currents flowing through the sub-heating coils SC1 to SC4 are opposite to each other, so that magnetic interference generated thereby is reduced. Compared to this, the space 271 is magnetically coupled and cooperatively heated, so the interval may be narrow. In this embodiment, the size ratio between the space 273 and the space 271 is set to 3: 1 or 4: 1. Therefore, when the space 271 is 5 mm as described above, the space 273 is 15 mm or 20 mm.

(Individual light emitting part)
In FIG. 21, FIG. 23, FIG. 24 and FIG. 29, the individual light emitting sections 276 are light emitters installed at four locations so as to be scattered on the same concentric circle as the main heating coil MC. The individual light emitting unit 276 includes a light source (not shown) using a light bulb, organic EL, LED (light emitting diode), and the like, and a light guide that guides light incident from the light source. It is driven by the drive circuit 278 shown in FIG.

  The light guide may be made of a synthetic resin such as acrylic resin, polycarbonate, polyamide, polyimide, or a transparent material such as glass. The upper end surface of the light guide is directed to the lower surface of the top plate 21 as shown in FIG. 29, and light from the light source is radiated from the upper end surface of the light guide as shown by a one-dot chain line in FIG. For example, Japanese Patent No. 3941812 proposes a light-emitting body that emits light to the filament in the upward direction. It is possible to know whether or not the auxiliary heating coils SC <b> 1 to SC <b> 4 are performing induction heating operation by the individual light emitting unit 276 emitting and lighting.

(Wide area light emitting part)
21, 23, 24, and 29 again, the wide-area light emitting unit 277 surrounds the outside of the individual light emitting unit 276 with a predetermined space 275 so as to be concentric with the individual light emitting unit 276. An annular light emitter having a maximum outer diameter of DC. The wide-area light emitting unit 277 includes a light source (not shown) and a light guide that guides light incident from the light source, as with the individual light emitting unit 276. As shown in FIG. Driven by 278.

  As shown in FIG. 29, the upper end surface of the light guide of the wide-area light emitting unit 277 is directed to the lower surface of the top plate 21, and the light from the light source as shown by the alternate long and short dash line in FIG. Since the wide light emitting portion 277 emits light and lights up, the group outer edge portion of the sub-heating coils SC1 to SC4 and the main heating coil MC can be discriminated.

The position of the guide mark 6LM which is a circle displayed on the top plate 21 does not coincide with the position of the individual light emitting unit 276.
Although the position of the guide mark 6LM substantially corresponds to the outer diameter dimension DA of the main heating coil MC, the individual light emitting portion 276 surrounds the outside of the auxiliary heating coils SC1 to SC4 with a certain margin (for example, 20 mm). It is because it is such a size.

  In addition, the position of the circular cooperative heating area mark EM displayed on the top plate 21 and the position of the wide-area light emitting unit 277 substantially coincide with each other, but the cooperative heating area mark EM is formed on the upper surface of the top plate 21 by normal printing or the like. Therefore, the upper end surface of the wide-area light-emitting portion 277 is closely opposed to the outer position of only a few millimeters in consideration of the printing or coating film (a material that hardly transmits visible light is used). Is set to In addition, as long as the translucency of the cooperative heating area mark EM is ensured, you may make it match completely. For example, when the outer diameter of the heating coil 6RC of the right induction heating unit 6R is 240 mm, the outer diameter of the magnetic shield ring 291 is about 244 mm, and the position of the cooperative heating area mark EM is a circle with a diameter of about 280 mm to 290 mm. It becomes on.

(Infrared sensor placement)
As shown in FIG. 21, the infrared sensor 31 </ b> L includes five elements 31 </ b> L <b> 1 to 31 </ b> L <b> 5, and the heat sensitive part of the infrared sensor 31 </ b> L <b> 1 is installed in the space 270. This temperature sensor 31L1 detects the temperature of an object N to be heated such as a pan placed on the main heating coil MC. On the outside of the main heating coil MC, thermal sensors 31L2 to 31L5 for the sub-heating coils SC1 to SC4 are arranged, respectively, and these infrared sensors are all formed in a protruding shape formed on the coil support 290. It is installed in the supporting protrusion 290A.

  In addition, it is also possible not to use the infrared sensors 31L2 to 31L5 described above in order to exert the function of the heated object placement determination unit 280, that is, the function of determining whether or not the heated object N is placed. An alternative means is a light detection unit (photosensor). This is because it is possible to determine whether or not natural light such as indoor illumination light and sunlight rays can reach from above the top plate 21. When the object to be heated N is not placed, the light detection unit below the object to be heated N detects disturbance light such as room lighting, so that it can be determined that no object such as a pan is placed. .

  The temperature data from each temperature sensor 31R, 31L, 241, 242, 244, 245 is sent to the energization control circuit 200 via the temperature detection circuit 240, but the infrared sensors (31L1 to 31L5 of the heating coils 6RC, 6LC). Temperature detection data) (all five) is input to the heated object placement determination unit 280.

  The metal magnetic shield ring 291 (see FIG. 29) is a ring-shaped ring that is attached and installed on the outermost side of the coil support 290. This magnetic shield ring 291 is installed at the outermost position of each of the heating coils 6RC, 6LC, 6MC of the three induction heating sources 6R, 6M, 6L, and is larger than the outer diameter of each of the heating coils 6RC, 6LC, 6MC. 4-5mm larger diameter. Further, the width (thickness) when the ring itself is viewed from above is about 1 mm. That is, the heating coils 6RC, 6LC, and 6MC are installed on the outside from the outermost peripheral edge by about 1 mm. For example, in FIG. 29, when the maximum outer diameter DB of the left side heating coil 6LC is about 200 mm, the inner diameter of the magnetic shielding ring 291 surrounding the left outer heating coil 6LC is about 202 mm and the outer diameter is about 204 mm.

  The speaker 316 shown in FIG. 24 is driven by a signal from the speech synthesizer 315. The voice synthesizer 315 notifies various information displayed on the integrated display means 100 by voice, and the name of the heating source (for example, the first induction heating unit 6L) that is executing the thermal power or the heating operation. , Elapsed time from the start of cooking, remaining time set by the timer, various detected temperatures, reference information displayed in the guide area (100GD), detection of abnormal operation, and improper operation depending on the time of use It is possible to report information such as information that has been broken, and also include information that allows various cooking to be performed in a preferable state and a heating position (including the position of the object to be heated N) as much as possible. Information on which of the main heating coil MC and the sub-heating coil SC described later is actually performing the heating operation is also included.

(Operation of the heating cooker)
Next, the outline | summary of operation | movement of the heating cooker which consists of said structure is demonstrated centering on FIG.
A basic operation program from turning on the power to starting cooking preparation is stored in the storage unit 203 (see FIG. 25) inside the energization control circuit 200.
The user first connects the power plug to a 200V commercial power source, and presses the operation button 63A (see FIG. 14) of the main power switch 63 to turn on the power.

  Then, a predetermined low power supply voltage is supplied to the energization control circuit 200 via a constant voltage circuit (not shown), and the energization control circuit 200 is activated. A self-diagnosis is performed by the control program of the energization control circuit 200 itself, and if there is no abnormality, the motor drive circuit 33 for driving the drive motor 300 of the blower 30 is preliminarily driven. Further, the first induction heating unit 6L, the second induction heating unit 6R, and the drive circuit 215 for the integrated display means G are also preliminarily activated.

  The temperature detection circuit 240 of FIG. 25 includes temperature detection elements (temperature sensors) 31R and 31L (unless clearly indicated, in the following description, includes all five elements 31L1 to 31L5), temperature detection elements 241 and 242. The temperature data detected by 244, 245 is read, and the data is sent to the energization control circuit 200.

  As described above, the energization control circuit 200 collects data such as circuit currents, voltages, and temperatures of main components, and thus the energization control circuit 200 performs abnormal heating determination as abnormality monitoring control before cooking. For example, when the temperature around the liquid crystal substrate of the integrated display unit 100 is higher than the heat resistant temperature (for example, 70 ° C.) of the liquid crystal display substrate, the energization control circuit 200 determines that the temperature is abnormally high.

  Also, the current detection sensor 227 in FIG. 25 detects a current flowing through the resonance circuit 225 including a parallel circuit of the right heating coil 6RC and the resonance capacitor 224, and this detection output is supplied to the input unit 201 of the energization control circuit 200. The energization control circuit 200 compares the acquired detection current of the current detection sensor with the normal current value of the determination reference data stored in the storage unit 203, and if an undercurrent or an overcurrent is detected, the energization control circuit 200 The control circuit 200 determines that there is an abnormality due to some accident or poor conduction.

  When there is no abnormality determination by the above self-diagnosis steps, “cooking start preparation is completed”. However, when the abnormality determination is performed, a predetermined abnormality process is performed and cooking cannot be started (the abnormality detection is similarly performed in the left heating coil 6LC).

  When there is no abnormality determination, on the display screen 100 of the integrated display means G, each heating source corresponding area 100L1, 100L2, 100M1, 100M2, 100R1, 100R2, 100G displays that the heating operation is possible, and the desired heating In the case of induction heating, a heating source N such as a pan is selected to be placed on the desired heating source guide marks 6LM, 6RM, 7M drawn on the top plate 21 (integrated display). The voice synthesizer 315 prompts the user to perform such an operation at the same time by voice so as to be linked with the means G). At the same time, all the individual light emitting units 276 and the wide area light emitting unit 277 are instructed by the energization control circuit 200 to emit and light with light of a predetermined color (for example, yellow, hereinafter referred to as “form 1”).

Next, an overall main control operation from the completion of the abnormality determination as described above to the completion of cooking for cooking will be described with reference to FIG.
First, when the main power supply is turned on and the user instructs a heating preparation operation with an operation unit (not shown), the heated object placement determination unit 280 causes the main heating coil MC and the sub-heating coils SC1 to SC4 to It is estimated whether or not the object N to be heated is placed above the coil, or whether or not the bottom area of the object to be heated N is larger than a predetermined value, and this estimation result is supplied to the energization control circuit 200 which is a control unit. It is transmitted and it is determined whether the heat treatment is suitable for a large-diameter pan or the heat treatment suitable for a normal pan (step MS11).
If it is a suitable pan, but it is a normal size pan or small pan, or if it is not suitable for heating, it will be treated separately from the large-diameter pan.

  The energization control circuit 200 displays a message prompting the user to select a desired cooking menu on the display screen 100 of the integrated display means G installed in the vicinity of the operation unit E (MS12).

When the user selects and inputs a cooking menu, heating power, cooking time, etc. with the operation unit (MS13), induction heating operation is started in earnest (MS14).
As in the first embodiment, the cooking menu displayed on the display screen 100 is “high-speed heating”, “fried food”, “hot water”, “preheating”, “cooking rice”, “boiled”, “hot water + warming”. Seven.

  When the user selects any one of these seven cooking menus, the control mode corresponding to those menus is automatically selected by the built-in program of the energization control circuit 200, and the main heating coil MC and sub heating coil are selected. The energization availability, energization amount (thermal power), energization time, etc. of each of SC1 to SC4 are set. Depending on the cooking menu, a message is displayed on the display unit to prompt the user to set an arbitrary heating power, energizing time, etc. (MS15).

  With the above, preparation for shifting to the cooking process for large-diameter pans is completed, and after the cooking menu is selected, induction heating operation is started immediately. Note that “normal pan” and “small pan” are basically the same as steps MS12 to MS15. In the case of “normal pan” or “small pan”, seven cooking menus as shown in FIG. 32 are displayed on the display screen 100 as cooking menus. In the second embodiment, heating is performed only by the main heating coil MC at the center, so that the control content (thermal power, energization pattern, etc.) is greatly different. Of course, since all or only a part of the sub-heating coils SC1 to SC4 cannot be individually heated and driven, there is no heating pattern using the sub-heating coils SC1 to SC4. That is, the convection promotion control using the auxiliary heating coils SC1 to SC4 is not performed.

(Cooking process)
Next, the case where it transfers to a cooking process is demonstrated taking the case where the 2nd induction heating part 6R is used with a "normal pan or a small pan" as an example. In addition, in this Embodiment 2, a small pan means a thing with a diameter of less than 10 cm.
There are two methods of using the second induction heating unit 6R: using the front operation unit 60 and using the upper operation unit 61.

(Cooking at the front operation unit)
First, the case where the front operation unit 60 is used will be described.
The user first turns the right operation dial 64R of the front operation unit 60 to the right or left (the heating power is set according to the amount of rotation).

  Since three independent timer dials (not shown) are provided at the lower front surface of the front operation frame 62 of the front operation unit 60, the user sets the timer of the right induction heating source 6R therein for a predetermined time. Set to. Thereby, such an operation signal is input to the energization control circuit 200, and the energization control circuit 200 sets cooking conditions such as a heating power level and a heating time.

  Next, the energization control circuit 200 drives the drive circuit 228 to drive the right heating source circuit 210R (see FIG. 25). Since the display screen 100 is driven by the drive circuit 215, cooking conditions such as heating power and cooking time are displayed in the display area. Since the drive circuit 228 applies a drive voltage to the gate of the IGBT 225, a high frequency current flows through the heating coil 6RC. However, high-heat energization heating is not performed from the beginning, and appropriateness detection of the heated object N such as a pan is performed as follows.

  The current detection sensor 227 detects a current flowing through a resonance circuit including a parallel circuit of the heating coil 6RC and the resonance capacitor 224, and a detection output is supplied to an input unit of the energization control circuit 200. When an undercurrent or an overcurrent is detected as compared with the normal current value due to some accident or poor conduction, the energization control circuit 200 determines that there is an abnormality. The energization control circuit 200 has a function of determining whether or not the size of the pan (object to be heated N) to be used is appropriate in addition to the above type of abnormality determination function.

  Specifically, a predetermined power (for example, 1000 W) is supplied to the resonance circuit 225 instead of the heating power (electric power) set by the user for the first few seconds, and the current detection sensor 227 detects the input current value at that time. It is configured.

  That is, when the energization control circuit 200 drives the IGBT 225 as the switching means by outputting a drive signal with the same conduction ratio with a predetermined power, the pan having a smaller diameter than the heating coil 6RC (the object to be heated N) is the top. When placed on the plate 21, the current flowing through the current detection sensor 227 is placed on the top plate 21 with a pot having a diameter larger than the area of the heating coil 220 (6RC) (the heated object N). It is already known that it is smaller than the current flowing through the current detection sensor 227 when it is placed.

  Therefore, the value of the current flowing through the portion of the current detection sensor 227 when an excessively small pan (the object N to be heated) is placed in advance is prepared as determination reference data based on experimental results. Then, when a current that is too small is detected by the current detection sensor 227, it can be estimated on the energization control circuit 200 side that the battery is in an abnormal usage state, and the process shifts to an abnormal processing route.

  In addition, when the energization control circuit 200 changes the energization rate for the switching means 225 by itself and, for example, the heating power set by the user can maintain and ensure a normal heating state by reducing the conduction ratio to an allowable range, it is automatically The power adaptive control process is executed, and when a small current value is detected, it is not all unconditionally going to the abnormal process.

  In the state where the determination of the pan (the object N to be heated) is being performed as described above, the characters “during pot determination” are first displayed in the display area 100R2 of the second induction heating unit 6R. After a few seconds, according to the determination result of the abnormal current detection and monitoring process, in the case of a pan that is too small (the object to be heated N), the display area 100R2 indicates that “the pan to be used is too small”, “a larger pan (diameter 10 cm). Use the above) "warning message is displayed.

  When this pan suitability determination result is given, the display areas 100R1 and 100R2 of the second induction heating unit 6R are enlarged several times from the state of FIG. ) Is not appropriate. When neither the first induction heating unit 6L nor the third induction heating unit 6M is used, the display areas 100R1 and 100R2 of the second induction heating unit 6R are, for example, as shown in FIG. The second induction heating units 6L and 6M are enlarged to a size that includes the display areas 100L1, 100L2, 100M1, and 100M2. FIG. 32 shows a case where the first induction heating unit 6R and the third induction heating unit 6M are not used, and only the first induction heating unit 6L is used.

After that, when the user did not take measures such as replacing the pan (the heated object N), the display area E displayed that the pan (the heated object N) was too small without stopping the energization control circuit 200. After a certain time from the time, the heating operation by the right IH heating source 6R is automatically stopped once.
If the user changes the pan (the object to be heated N) to a larger one and performs an operation for starting cooking again, cooking can be resumed again. As described above, a small pan having a diameter of less than 10 cm is detected as an incompatible pan by the pan suitability determination process, and its use is prohibited.

  When the pan (heated object N) detection operation as described above is performed and it is determined that the pot is a suitable pot (heated object N), the energization control circuit 200 sets the second induction heating unit 6R to the original setting. An energization control process that automatically adapts to execute thermal power is executed. Thereby, the to-be-heated object N, such as a pan, becomes high temperature by the high frequency magnetic flux from the right side heating coil 6RC, and enters into an electromagnetic induction heating cooking operation (cooking mode).

  The direct current obtained by the rectifier bridge circuit 221 and the smoothing capacitor 223 is input to the collector of the IGBT 225 that is a switching element. When the drive signal from the drive circuit 228 is input to the base of the IGBT 225, the on / off control of the IGBT 225 is performed. By combining the on / off control of the IGBT 225 and the resonance capacitor 224, a high-frequency current is generated in the right heating coil 6RC, and the high-frequency current is placed on the top plate 21 above the right heating coil 6RC by the electromagnetic induction effect caused by the high-frequency current. Eddy currents are generated in the heated object N such as a pan. Thus, the eddy current generated in the heated object N becomes Joule heat, and the heated object N generates heat, which can be used for cooking.

  The drive circuit 228 has an oscillation circuit, and a drive signal generated by the oscillation circuit is supplied to the base of the IGBT 225 to control the IGBT 225 on / off. By adjusting the oscillation frequency and oscillation timing of the oscillation circuit of the drive circuit 228, the conduction ratio, conduction timing, current frequency, and the like of the right heating coil 6RC are adjusted, and the heating power of the right heating coil 6RC can be adjusted. When a full bridge circuit is used as the drive circuit for the main heating coil MC, the drive circuits 228A and 228B shown in FIG. 25 function in the same manner as the drive circuit 228.

  In addition, when the energization stop command for the second induction heating unit 6R is issued, the energization of the heating unit 6R is stopped, but the blower 30 continues to operate for 2 to 5 minutes even after the energization is stopped. . Accordingly, it is possible to prevent an overshoot problem in which hot air remains in the vicinity of the heating coil 6RC of the second induction heating unit 6R immediately after stopping the blowing from the blower 30 and the temperature rises rapidly. Moreover, the adverse effect that the temperature of the display screen 100 of the integrated display means G increases can be prevented. This operation continuation time is determined from a formula or numerical table that is determined in advance by the energization control circuit 200 in accordance with conditions such as the temperature rise until the energization is stopped, the room temperature, and the operating heat power level of the heating source.

  However, when it is determined that the cooling fan itself is out of order, such as when an abnormal current is detected from the blower 30 (for example, when only the temperature of the cooling fins 43A and 43B is increased), the blower 30 At the same time, the power supply to

The liquid crystal display substrate that constitutes the display screen 100 of the integrated display means G is reflected from the bottom of the article N to be heated and heated from the top plate 21 during the cooking of the first and second induction heating units 6L and 6R. It is heated by radiant heat.
Also, when the used hot pan for heating (heated object N) is placed on the center of the top plate 21 as it is, the heat from the hot pot (close to 200 ° C.) (heated object N). Receive.
Therefore, in the first embodiment, air is cooled from both the left and right sides by the blower 30 in order to suppress the temperature rise of the integrated display means 100.

  When the blower 30 is driven under such a normal operating environment, the air outside the main body 1 passes through the suction port 37B of the suction cylinder 37A of the fan case 37 as shown in FIG. Sucked into. The sucked air is discharged forward in the horizontal direction from the exhaust port (exit) 37C by the blade portion 30F rotating at high speed inside the fan case 37.

There is a component case 34 connected in close contact with the fan case 37 at a position in front of the exhaust port 37C, and the air introduction port communicates with the exhaust port 37C in close contact with the exhaust case 37C. Inside, air is sent from the blower 30 so as to increase its internal pressure (static pressure). A part of the sent cooling air is discharged from the first exhaust port 34 </ b> A on the side near the exhaust port 37 </ b> C on the upper surface of the component case 34.
The temperature of the released air is almost the same as the temperature immediately after exiting from the exhaust port 37C because it does not cool a high-temperature heating element or a heat-generating electrical component on the way, and remains fresh air. .

  Then, the cooling air sent from the first exhaust port 34A to the ventilation space 42F of the cooling duct is ejected upward from the ejection hole 42C as indicated by an arrow Y3 in FIG. Colliding with the lower surface of the heating coil 6RC of the part 6R, the coil is effectively cooled. In addition, when the shape of the heating coil 6RC has a gap that partially penetrates the air for cooling as described above, the cooling air flows from the first exhaust port 34A through the gap. Cool down.

  On the other hand, the cooling air sent into the component case 34 with pressure from the blower 30 is not directed to the surface of the circuit board 41 and does not flow near the surface. Since the cooling air passes between a large number of heat exchange fin elements centering on the portion of the radiation fins 43A and 43B that are structured to protrude from the surface (one side surface) of the circuit board 41, the radiation fins 43A and 43B are mainly used. To be cooled.

  Further, in the cooling air pushed in from the exhaust port 37C (arrow Y2 in FIG. 17), the main flow, which is the fastest part, flows straight from the exhaust port 37C forward as shown by the arrow Y4. In the case 34, it is ejected from the second exhaust port 34B located at the most downstream position in the flow of the cooling air. Since the second exhaust port 34B has an opening area several times larger than the first exhaust port 34A, most of the cooling air pushed into the component case 34 from the exhaust port 37C is the second exhaust port 34B. It is ejected from the exhaust port 34B. Since the cooling air is mainly cooled before the cooling air is ejected from the second exhaust port 34B to the outside of the component case 34 as indicated by an arrow Y4, the cooling air is attached to the radiation fins 43A and 43B. Heating components such as power control switching elements of the two inverter circuits 210R and 210M are cooled.

  The blown cooling air is guided into the ventilation spaces 42G and 42H of the cooling duct 42, and most of the cooling air is shown by arrows Y4 and Y5 in FIG. 19 from the discharge holes 42C formed in the upper surface of the upper case 42A. And then collides with the lower surface of the right heating coil 6RC just above it to cool the coil effectively.

  A part of the cooling air guided into the ventilation space 42H of the cooling duct 42 is a right thermal power display unit 101R and a left thermal power display unit 101L that display various electric / electronic components 56 and the thermal power during induction heating cooking with light. Each light-emitting element (LED) is guided into a front part case 46 in which it is housed. Specifically, the cooling air of the blower 30 enters the ventilation space 42H of the cooling duct 42 from the second exhaust port 34B of the component case 34, and from here the cooling duct 42 formed corresponding to the ventilation space 42H. The air passes through the air vent 42K and enters the air vents 46R and 46L (see FIG. 15) of the lower duct 46A positioned so as to be in close contact with the air vent 42K.

  As a result, the liquid crystal display screens 45R and 45L are first cooled from below by the cooling air entering the front part case 46, and then flow through the front part case 46 and finally discharged from the notch 46C to the upper part chamber 10. In the process, liquid crystal display screens 45R and 45L, integrated display means 100, mounting board 56 on which various electric / electronic components are mounted, and the thermal power during induction heating cooking are displayed by light by sequentially cooling the built-in components and the like. The light emitting elements for the right thermal power display unit 101R and the left thermal power display unit 101L are sequentially cooled by cooling air.

  In particular, the cooling air guided into the front part case 46 is not a wind that has cooled the left and right heating coils 6LC and 6RC that are heated at the time of the induction heating operation, so the temperature is low, and the liquid crystal display screens 45R and 45L. The display screen 100 of the integrated display means G and the like continue to be cooled so that the temperature rise is effectively suppressed while the amount of cooling air is small.

  As shown in FIGS. 14, 17 and 18, the cooling air ejected from the numerous ejection holes 42 </ b> C of the cooling duct 42 flows rearward as indicated by arrows Y <b> 5 and Y <b> 6 through the upper part chamber 10. The cooling air discharged from the notch 46C to the upper part chamber 10 is joined to the flow of the cooling air, and finally flows into the rear exhaust chamber 12 opened to the outside by the main body portion A, so that the rear exhaust chamber 12 is finally obtained. Is discharged as shown by arrow Y9 (see FIG. 14).

(Cooking started at the top operation unit)
Next, the case where the upper surface operation part 61 (refer FIG. 15) is used is demonstrated.
Since the energization control circuit 200 has already been activated and the display drive circuit 215 (see FIG. 25) for the display screen 100 of the integrated display means G has also been preliminarily activated, the display screen 100 of the integrated display means G has all the heating. An input key for selecting the source is displayed. Therefore, if an input key (any one of 143 to 145 shown in FIG. 30 becomes the key) for selecting the second induction heating unit 6R among them is pressed, the corresponding area 100R of the display screen 100 (100R1 for thermal power and Since the input keys 142 to 145 are displayed with the input functions switched for each scene, the displayed input keys are displayed one after another. If the operation is performed, the type of cooking (also referred to as a cooking menu. For example, boiling, boiling, heat retention, etc.) and cooking conditions such as a heating power level and a heating time are set.

At the stage where the desired cooking conditions can be set, the input key 146 displays the word “decision” as shown in FIG. 30, and touching this confirms the input of the cooking conditions. FIG. 30 shows a case where the second induction heating unit 6R is selected.
Then, as described above, the energization control circuit 200 performs the pot suitability determination process, and when it is determined that the pot is a suitable pot (heated object N), the energization control circuit 200 is connected to the second induction heating unit 6R. An energization control process that automatically adapts to execute a predetermined set thermal power set by the user is executed. Thereby, the pan of the article N to be heated becomes high temperature by the high-frequency magnetic flux from the right heating coil 6RC, and the electromagnetic induction heating cooking operation (cooking process) starts.

(One-touch setting cooking)
The right heating power setting operation unit 70 is provided with a one-touch setting key unit 90 for each heating power that can easily set the heating power of the second induction heating unit 6R with a single press of the user. Since the three one-touch keys of the low heat power key 91, the medium heat power key 92, and the high heat power key 93 are provided, the user goes through at least one menu screen by operating the input keys on the display screen 100 of the integrated display means G. If the weak heat key 91, the medium heat key 92, the strong heat key 93 or the 3KW key 94 is pressed, the heat can be input by one operation. The cooking using the first induction heating unit 6L can also be started by the same operation as above.

(Start cooking in the grill heating room)
Next, the case where the radiation type electric heating sources 22 and 23 (see FIG. 18) of the grill heating chamber 9 are energized will be described. This cooking can be performed during the cooking of the second induction heating unit 6R, the first induction heating unit 6L, and the third induction heating unit 6M, but the use exceeding the predetermined maximum rated power amount cannot be performed at the same time. In the energization control circuit 200, a restriction program incorporating an interlock function is incorporated in the electric cooker so as not to exceed the limit of the rated power of the entire cooking device.

  As a method of starting various types of cooking inside the grill heating chamber 9, a method using an input key displayed on the display screen 100 of the integrated display means G in the upper surface operation unit 61, and a method for radiating electric heating sources 22 and 23 are used. There are two methods of pressing the operation button 95 (FIG. 30).

  In any of these methods, various types of cooking can be performed in the grill heating chamber 9 by energizing the radiant electric heating sources 22 and 23 simultaneously or individually. The energization control circuit 200 receives the information from the temperature sensor 242 and the temperature control circuit 240, and the radiation type so that the internal atmosphere temperature of the grill heating chamber 9 becomes a target temperature set in advance by the energization control circuit 200. The energization of the electric heating sources 22 and 23 is controlled, and the fact is notified when a predetermined time has elapsed from the start of cooking (the display by the integrated display means G and the notification by the speech synthesizer 315), and the cooking ends.

  High-temperature hot air is generated inside the grill heating chamber 9 along with the cooking by the radiant electric heating sources 22 and 23. For this reason, the internal pressure of the grill heating chamber 9 naturally increases, and naturally rises in the exhaust duct 14 from the rear exhaust port 9E. In the process, the odorous component in the exhaust gas is decomposed by the deodorizing catalyst 121 which is energized by the driving heater driving circuit 214 and is heated to the catalytic electric heater 121H.

  On the other hand, since an axial flow fan 106 for auxiliary exhaust is provided in the middle of the exhaust duct 14, the fan 106 is operated against the hot air rising through the exhaust duct 14, and the arrow Y7 (see FIG. 18). When the air inside the main body A is taken into the exhaust duct 14 as shown in FIG. 6, the hot air in the grill heating chamber 9 is attracted to the fresh air, and the arrow from the upper end opening 14A of the exhaust duct 14 decreases while the temperature decreases. Exhaust as indicated by Y8.

  As described above, the exhaust flow from the upper end opening 14A (see FIG. 18) of the exhaust duct 14 also attracts the air in the rear exhaust chamber 12 adjacent to the upper end opening 14A to be discharged to the outside. That is, the air in the gap 26 between the grill heating chamber 9 inside the main body and the horizontal partition plate 25 and the air inside the upper part chamber 10 are also discharged through the rear exhaust chamber 12.

  Next, the operation in the case of performing cooking using the first induction heating unit 6L on the left side will be described. The first induction heating unit 6R on the left side shifts to the cooking mode after finishing the pre-cooking abnormality monitoring process similarly to the second induction heating unit 6R on the right side, and uses the first induction heating unit 6L. There are two methods, the case where the front operation unit 60 (see FIG. 14) is used and the case where the upper surface operation unit 61 (see FIG. 15) is used. Will be described from the stage when the left heating coil 6LC is energized and cooking is started.

  When using one elliptical or rectangular pan (object to be heated N) whose pot bottom diameter is much larger than the maximum outer diameter DA (see FIG. 21) of the main heating coil MC, the heating cooker of the second embodiment Then, there is an advantage that the elliptical object N can be heated by the main heating coil MC and can be cooperatively heated by the sub-heating coils SC1 to SC4.

For example, the case where it is the elliptical pan (to-be-heated object N) which straddles on both the main heating coil MC and one subheating coil SC1 on the right side is assumed.
When such an elliptical pan (object to be heated N) is placed and cooking is started, the temperature of the elliptical pan (object to be heated N) rises, but the infrared rays of the main heating coil MC Both of the sensor 31L1 (see FIG. 21) and the infrared sensor 31L2 of the sub-heating coil SC1 are compared with the amount of light received by the other infrared sensors 31L3, 31L4, and 31L5. Since there is a small amount of input and a phenomenon that the temperature tends to rise, the heated object placement determining unit 280 based on such information indicates that an elliptical pan (heated object N) exists. Make a decision.

  Further, whether or not the same object N to be heated is placed above is also determined by the current sensor 227 of the main heating coil MC and the current sensors 267A to 267D (see FIG. 25) of the sub-heating coils SC1 to SC4. The basic information to be input is input to the heated object placement determination unit 280 (see FIGS. 25 and 28). By detecting a current change, the object to be heated placement determination unit 280 detects a change in impedance of the main heating coil MC and the sub heating coil SC, and an elliptical pan (object to be heated N) is placed. The main inverter circuit MIV of the main heating coil MC and the sub inverter circuits SIV1 to SIV4 of the sub heating coils SC1 to SC4 are driven, and the elliptical pan (the heated object N) among the four sub heating coils SC1 to SC4 A high-frequency current is applied to the one (at least one) on which is placed, and the high-frequency current is suppressed or stopped for other sub-heating coils on which the elliptical pan (object to be heated N) is not placed. Thus, the energization control circuit 200 issues a command signal.

  For example, when the heated object placement determining unit 280 determines that the same elliptical pan (heated object N) is placed above the main heating coil MC and one sub-heating coil SC1, The energization control circuit 200 operates only the main heating coil MC and the specific sub-heating coil SC1 in conjunction with each other, and supplies high frequency power to the two heating coils by the inverter circuits MIV and SIV1 at a predetermined heating power ratio. (This thermal distribution will be explained in detail later).

Here, the “thermal power ratio” means that, for example, when the user starts cooking with 3000 W of thermal power in the first induction heating unit 6L, the energization control circuit 200 sets the main heating coil MC to 2400 W and the auxiliary heating. When the coil SC1 is distributed at 600W, it means the ratio between 2.4KW and 600W. In this example, it is 4: 1. Further, only the individual light emitting unit 276 (see FIGS. 21 and 29) located outside the sub-heating coil SC1 changes from the yellow light emitting state (form 1) to the red light emitting state (hereinafter referred to as “form 2”). The drive circuit 278 (see FIG. 25) drives the individual light emitting unit 276, and a predetermined light source (such as a red lamp or LED) in the individual light emitting unit 276 emits and lights up, and the yellow light that has been emitted and lit up to this point. The light source is turned off. Therefore, only the sub-heating coil SC1 being executed is displayed in a red light band so as to be visible from above the top plate 21. The individual light emitting units 276 corresponding to the other sub-heating coils stop emitting light.

  The sub-heating coil SC1 alone cannot be driven to perform induction heating cooking, and each of the other three sub-heating coils SC2, SC3, SC4 and combinations thereof cannot be induction heating cooking. It has become. In other words, when the main heating coil MC is driven, one or more of the four sub-heating coils SC1, SC2, SC3, and SC4 around the first heating coil MC are heated at the same time. However, when a heated object N having a large outer diameter that covers all of the four sub-heating coils SC1, SC2, SC3, and SC4 is placed, the convection promotion mode is performed as follows. A control pattern for driving four sub-heating coils is prepared in the control program of the energization control circuit 200. When the main heating coil MC is driven to be heated, all or part of the sub-heating coils SC1, SC2, SC3, and SC4 are simultaneously heated and driven in a predetermined order or heating power. During the period in which the main heating coil MC is heated, all or a part of the sub-heating coils SC1, SC2, SC3, SC4 is heated and driven in a predetermined order or heating power. All or part of the sub-heating coils SC1, SC2, SC3, and SC4 are heated and driven in a predetermined order and thermal power for a predetermined time before the heating driving of the main heating coil MC is finished (for example, at the end of cooking).

  In addition, when such cooperative heating is performed, the energization control circuit 200 uses only a main heating coil MC and a specific sub-heating coil SC1 to transfer these two heating coils to a dedicated inverter circuit at a predetermined heating power ratio. Since the high frequency power is supplied by MIV and SIV1 to perform the heating operation, the energization control circuit 200 issues a drive command to the drive circuit 278 (see FIG. 25) based on this information, and the individual light emitting unit 276 As described above, light is emitted from the start of the cooperative heating operation so that the sub-heating coil SC1 being executed can be identified.

In addition, as a means for displaying cooperative heating, in the second embodiment, the individual light emitting unit 276 emits light and is displayed. That is, the user can recognize that the individual light emitting unit 276 has entered the cooperative heating state when the individual yellow light emitting state (form 1) changes to the red light emitting state ("form 2").
Instead of such a display form, it may be displayed directly with characters on the liquid crystal display screen of the integrated display means 100.

  The wide-area light emitting unit 277 (see FIGS. 21, 23, and 29) is driven from the stage when the user turns on the power by pressing the operation button 63A (see FIG. 14) of the main power switch 63 and completes the abnormality determination. Since it is driven by the circuit 278 (see FIG. 25) and initially emits light in yellow and is lit, the oval pan (the object N to be heated) is placed from the stage over the first induction heating unit 6R. The location can be guided to the user. At the stage when the heating high-frequency power is supplied to the main heating coil MC and the heating operation is started, the energization control circuit 200 changes the emission color of the wide-area light emitting unit 277 (for example, the one that has been yellow is changed to red). For example, the yellow light source (lamp, LED, etc.) in the wide-area light emitting unit 277 is turned off and turned on, and instead, the red light source (lamp, LED, etc.) installed next to the light source is turned on and turned on. Alternatively, the emission color may be changed using a multicolor light source (such as a three-color light emitting LED).

  In addition, the energization control circuit 200 performs the heating operation even if the oval pan (the heated object N) is temporarily lifted or moved left and right for a predetermined time t (several seconds to 10 seconds). While maintaining, the light emission and lighting state of the wide-area light emitting unit 277 are not changed, and a place preferable for placing the elliptical pan (the heated object N) is continuously displayed to the user. Here, if the elliptical pan (the heated object N) is lifted over the predetermined time t, the determination that the elliptical pan (the heated object N) is not present is made. 280, and outputs that fact to the energization control circuit 200. The energization control circuit 200 temporarily reduces the heating power of the induction heating until the elliptical pan (the heated object N) is placed again based on the determination information from the heated object placement determining unit 280, Issue a command to stop. In this case, the display of the place preferable for placing the elliptical pan (the heated object N) is maintained as it is for the user, but the light emission and lighting state (lighting color, etc.) of the wide-area light emitting unit 277 is the thermal power. You may change according to the state. For example, in a state where the thermal power is lowered, if the light is lit and lit in orange or lit in yellow when the thermal power is stopped and lit, the user is notified of the state of the thermal power together with a display of a preferred place for placement. It becomes possible.

  Further, when the elliptical pan (object to be heated N) is moved, for example, to the left, the object-to-be-heated object placement determination unit 280 has the same elliptical pan above the main heating coil MC and the left sub-heating coil SC2. The energization control circuit 200 determines that the (heating target N) is placed, and the energization control circuit 200 determines the main heating coil MC and the specific sub-heating on the left side based on the discrimination information from the heating target placement determination unit 280. Only two of the coils SC2 are operated in conjunction with each other, and high frequency power is supplied from the respective inverter circuits MIV and SIV2 to the two heating coils at a predetermined heating power ratio. Then, the energization to the left sub-heating coil SC2 is stopped, and cooking is performed to cook with a thermal power of 3000 W with a “thermal power” (for example, 3000 W) already being executed and a predetermined thermal power distribution (for example, the left IH heating source 6L). In this case, since the main heating coil MC is 2499 W and the sub-heating coil SC1 is 600 W, 4: 1) is maintained and cooking continues. This 3000 W thermal power continues to be displayed as numbers and letters by the integrated display device 100 as they are.

  In addition, the sub-heating coil SC1 does not contribute to the cooperative heating, and instead of the other sub-heating coil SC2 participating in the cooperative heating operation, the high-frequency power is supplied to the dedicated inverter SIV2. That is, when the energization control circuit 200 detects that the sub-heating coil has been switched from SC1 to SC2 based on the discrimination information from the heated object placement determination unit 280, it issues a drive command to the drive circuit 278 and performs individual light emission. The unit 276 instructs the sub-heating coil SC2 that is executing the cooperative heating operation to be identified. That is, in the energization control circuit 200, the drive circuit 278 drives the individual light emitting unit 276 so that only the individual light emitting unit 276 located outside (on the left side in FIG. 19) of the sub-heating coil SC2 emits light. Therefore, a predetermined light source (red lamp, LED, etc.) in the individual light emitting unit 276 emits and lights (in form 2), and the red light source that has been emitted and lit at a position close to the sub-heating coil SC2 so far is Disappear.

  Note that the direction of the high-frequency current IA flowing through the main heating coil MC and the high-frequency current IB flowing through the sub-heating coils SC1 to SC4 are the same in the adjacent sides as shown by the solid line arrows in FIG. (In FIG. 23, the case where the four sub-heating coils SC1 to SC4 coincide with each other in the counterclockwise direction in the main heating coil MC is shown). In this way, when currents flow in the same direction in adjacent regions of two independent coils, the magnetic fluxes generated by the currents strengthen each other and increase the magnetic flux density interlinking the object to be heated N. This is because a large amount of eddy current is generated on the bottom surface of the object to be heated and induction heating can be performed efficiently. A loop indicated by a broken line in FIG. 22 indicates a magnetic flux loop in a case where the high-frequency currents IA and IB shown in FIG.

  In this magnetic flux loop, an eddy current flowing in the direction opposite to the high-frequency current is generated on the bottom wall surface of the object N to be heated, and Joule heat is generated. When the main heating coil MC and the sub-heating coils SC1 to SC4 are installed close to each other and the currents flow in opposite directions, the alternating magnetic fields generated by both interfere with each other in a certain area range close to each other. As a result, the pan current generated in the main heating coil MC and the sub-heating coils SC1 to SC4 (current flowing through the object to be heated N) cannot be increased, and the calorific value increases in proportion to the square of the pan current. Cannot be increased. However, this in turn has another advantage. That is, since the magnetic flux density is kept low in the adjacent region where the magnetic flux density is increased as described above, the main heating coil MC and one or a plurality of sub-heating coils SC1 to SC4 that perform the cooperative heating operation are planarly arranged. In such a wide area, there is an advantage that the distribution of magnetic flux interlinking the object to be heated N can be averaged, that is, uniform, and the temperature distribution can be averaged when cooking in such a wide heating area. is there.

  Therefore, in this embodiment, a method in which currents flow in the same direction in the adjacent regions of the heating coil MC and the sub-heating coils SC1 to SC4 is adopted in the case of a specific cooking menu, and by another cooking menu. Adopts a switching operation in which the direction of the current is reversed. Note that the direction in which the magnetic loop as shown in FIG. 27 is generated is determined according to the direction of the high-frequency currents IA and IB flowing through the heating coil.

Next, what is shown in FIGS. 32 to 35 is a flowchart of the cooking operation according to Embodiment 2 of the present invention.
The control program of this flowchart is stored in the storage unit 203 (see FIG. 23) inside the energization control circuit 200.

  Since FIG. 32 has been described before, FIG. 33 will be described. First, when cooking is started, first, the operation button of the main power switch 63 provided in the front operation unit 60 of the cooker main body A shown in FIG. 13 is pressed to turn it on (step 1. Hereinafter, step is abbreviated as “ST”. To do). Then, a power supply of a predetermined voltage is supplied to the energization control circuit 200, and the energization control circuit 200 executes an abnormality check for the entire cooking device by itself (ST2). Self-diagnosis is performed by the control program of the energization control circuit 200 itself. If there is no abnormality, a motor drive circuit 33 (see FIG. 25) for driving the drive motor 300 of the blower 30 is preliminarily driven. Further, the first induction heating unit 6L and the drive circuit 215 of the display screen 100 of the integrated display means G are also preliminarily activated (ST3).

If there is no abnormality as a result of the determination process (ST2), the process proceeds to ST3. On the other hand, if an abnormality is found, the process proceeds to a predetermined abnormality process. Finally, the energization circuit 200 itself turns off and stops.
When proceeding to ST3, the energization circuit 200 controls the drive circuit 278 to simultaneously emit and light all the individual light emitting units 276 and the wide area light emitting units 277 (yellow light, form 1). Note that either the individual light emitting unit 276 or the wide area light emitting unit 277 emits and lights up one by one first, then another light emitting unit emits and lights up, and the number of light emitting units gradually increases. The light emitting unit 276 and the wide area light emitting unit 277 may emit light and light up. In this way, all the individual light emitting units 276 and the wide area light emitting unit 277 are in a state of waiting for the next command from the user in a state where the individual light emitting units 277 emit light and remain lit (in the first mode). Here, all the individual light emitting units 276 and the wide area light emitting units 277 are in a state of continuously emitting, for example, yellow light (ST3A).

  Next, since there are the first and second induction heating units 6L and 6R (see FIG. 14) as described above, either one is selected by the user using the front operation unit 60 or the upper operation unit 61 (ST4). When the first induction heating unit 6L is selected here, the selection result is displayed in the corresponding area 100L1 on the display screen 100 of the integrated display means G. As shown in FIG. 33, the areas of the corresponding areas 100L1 and 100L2 are automatically expanded, and the areas are maintained for a certain period of time (when other heating sources such as the second induction heating unit 6R are not operated). Until the cooking is completed, the enlarged areas of 100L1 and 100L2 are maintained as they are). And it is detected whether there exists a pan (to-be-heated material N) on the selected heating coil 6LC. This detection is performed by the heated object placement determination unit 280.

  When the energization control circuit 200 determines that the pan (the heated object N) is placed based on the detection information from the heated object placement determining unit 280 (ST5), the pan (the heated object N) is induction heated. It is determined whether or not it is suitable for (ST6). This determination is performed based on the determination information from the article placement determination unit 280 to be heated. The to-be-heated object placement determination unit 280 is configured to use an electric pot that is too small (a to-be-heated object N) having a diameter of several centimeters, etc. The to-be-heated object N is discriminate | determined by the difference in a physical characteristic, and a discrimination | determination result is output as discrimination information.

  Then, the energization control circuit 200 determines whether the pan (the heated object N) is appropriate based on the determination information from the heated object placement determining unit 280 in ST6, and determines that it is appropriate. In this case, the process proceeds to step ST7 for starting the heating operation. In the corresponding area 100L1 of the first induction heating unit 6L of the display screen 100, the set thermal power (for example, 150 W of “thermal power 1” of the minimum thermal power to 2500 W of “thermal power 8”. 9 levels of 3000 W of “maximum thermal power”. Any one) is displayed. For example, 1000 W. In addition, even if the thermal power is initially set to a predetermined thermal power, for example, medium fire (for example, thermal power 5 and 1000 W), the user can start cooking with the initial thermal power without setting the thermal power. good. At the same time, the thermal power level is also displayed on the right thermal power display portion 101R.

If it is inappropriate, since the display means such as the integrated display means G has already been operated at this stage, the energization control circuit 200 displays the pan (cover) on the display screen 100 of the integrated display means G. A message indicating that the heated object N) is inappropriate is displayed, and at the same time, message information to that effect is output to the voice synthesizer 315, and the speaker 316 is notified by voice.
As described above, when one of the first and second induction heating units 6L and 6R is selected, cooking is automatically started based on a predetermined heating power (for example, 1000 W as described above). It is not necessary to give a cooking start command with an input key, a dial, or an operation button. Of course, the user can arbitrarily change the heating power at any time after the induction heating is started.

  When induction heating operation is started at the left induction heating source 6L (ST7A), induction heating is performed by the main heating coil MC and the auxiliary heating coils SC1 to SC4 constituting the heating source. Since it is detected whether the object N) is only on the main heating coil MC or in addition to which sub-heating coils SC1 to SC4, if it is only on the main heating coil MC, If the main heating coil MC is induction heating alone, and the same pan (object to be heated N) is also placed on at least one sub-heating coil SC, the main heating coil MC and the sub-heating coil SC. It becomes cooperative heating by. In ST8, such a determination process is performed.

  In the case of cooperative heating, the sub-heating coils SC1 to SC4 and the main heating coil MC involved in the heating are supplied with high-frequency currents from the inverter circuits MIV and SIV1 to SIV4 under the control of the energization control circuit 200, respectively. Started (ST9). Then, in response to a control command from the energization control circuit 200, the wide-area light emitting unit 277 changes the light emission form from yellow light emission and lighting state (form 1) to red light emission and lighting state (form 2) (ST10). In addition, the same yellow light as ST3A is emitted and turned on, and the light emission and lighting are turned on intermittently so that it appears to the user as blinking, or the brightness of the light emission and lighting is increased. Any of them may be a change in form and switching in the present invention.

  In addition, the energization control circuit 200 outputs, to the display screen 100 of the integrated display means G, for example, information indicating that a cooperative heating operation is being performed by the main heating coil MC and the sub heating coil SC1 together with the thermal power information. As a result, the fact that the sub-heating coil that has started the heating operation is SC1 is displayed in the corresponding areas 100L1 and L2 of the display screen 100 as characters or figures. FIG. 33 shows a display example using characters “During simultaneous heating of main coil and left sub-coil”. Since the display portion is in the corresponding area L1, the display is adjacent to the display of thermal information “thermal power: maximum 3 kW”. In other words, the display positions of the thermal power display and the information indicating the cooperative heating operation are adjacent to each other. Here, CM corresponds to information indicating a cooperative heating operation. In addition, the energization control circuit 200 creates audio information such as “the left sub-coil is also being heated” and outputs the audio information to the speaker 316, and the above message is notified by audio simultaneously with the display from the speaker 316.

  In addition, as shown in FIG. 21, for example, as shown in FIG. 21, the user can visually identify the sub-heating coils SC1 to SC4 that are involved in the cooperative heating separately from the light emission and lighting state continuation of the wide-area light emitting unit 277. The individual light emitting units 276 provided for each of the sub-heating coils SC1 to SC4 may simultaneously emit light and light up.

  And the process of ST8-ST10 is repeated with a short period of a few second interval until the cooking stop command from a user comes. Even if the right side sub-heating coil SC1 is involved in the cooperative heating, the user may move the pan (the heated object N) in the middle of cooking a little in the front, rear, left and right. For this reason, after the movement, the placement place of the pan (the heated object N) changes. Therefore, in the cooperative heating determination step ST8, the information of the heated object placement determination unit 280 is also output to the speech synthesizer 315. Thereby, in the speech synthesizer 315, when the process of specifying the sub-heating coils SC1 to SC4 to be heated by the energization control circuit 200 from the information of the heated object placement determination unit 280 and the temperature sensors 31L1 to 31L5 is performed, The result is notified in real time. At the same time, the text is displayed on the display screen 100 as well.

  On the other hand, when it is determined in ST8 that the heating is not cooperative (corresponding to step MS11 in FIG. 35), the energization control circuit 200 controls the main inverter circuit MIV to drive only the main heating coil MC. Thereby, high frequency current is supplied from the main inverter circuit MIV to the main heating coil MC, and individual heating is started (ST11). Then, in correspondence with the main heating coil MC involved in the individual heating, the individual light emitting unit 276 that emits light to the outer peripheral edge of the heating region is changed from yellow light emission, lighting state (form 1) to red light emission, The light emission form is changed to the lighting state (form 2) (ST12).

  It should be noted that while the same color as ST3 is emitted and lit, light emission and lighting are intermittently made to appear to blink to the user, or the brightness of the emission is increased. Any of them is a kind of form change and switching. In addition to the light emission and lighting state continuing of the individual light emitting unit 276, the light emission and lighting of the wide area light emitting unit 277 may be continued as they are, or may be turned off. Then, the process proceeds to Step 13.

  When the heating cooking stop command is received from the user, or when it is determined by the energization control circuit 200 that timer cooking is being performed and a predetermined set time has elapsed (time up), the energization control circuit 200 is The inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 are controlled to stop energization of the main heating coil MC and all the sub heating coils SC1 to SC4 that are heated at that time. Further, the energization control circuit 200 alerts that the temperature of the top plate 21 is high, so that the high temperature notification operation is started by a method such as flashing all the wide light emitting units 277 and the individual light emitting units 276 in red (ST14). ). Further, the fact that the time is up is also displayed on the display screen 100 and the liquid crystal display unit 45L.

  The high-temperature notification operation is performed until a predetermined time (for example, 20 minutes) elapses after the energization of the main heating coil MC and all the sub-heating coils SC1 to SC4 is stopped, or the temperature from the temperature detection circuit 240. It continues until the temperature of the top plate 21 falls to, for example, 50 ° C. according to the detection data (it usually takes 20 minutes or more for natural heat dissipation). When such temperature decrease or time passage is determined in ST15 and the high temperature notification condition is satisfied, the energization control circuit 200 ends the high temperature notification and ends the operation of the cooking device (after this, automatically The power switch is also turned off, that is, when the power switch is turned on, the power supply to the power switch ON holding relay (not shown) is cut off, so that the power switch is automatically turned off when this relay is turned off. To OFF.)

  In addition, the energization control circuit 200 synchronizes with the high temperature notification operation start ST14 on the display screen 100 of the integrated display means G, such as a precautionary statement “Do not touch the top plate because it is still hot” or the like. The figure etc. which understand what is displayed. In addition, the display screen 100 may be provided in the vicinity thereof with a separate display unit that displays the word “high temperature caution” on the top plate 21 by the LED, thereby further providing high temperature notification.

Since it is the above structure, in this Embodiment 2, the large diameter pan which was not able to be heated conventionally can also be induction-heated, and also energization is started to a heating coil and substantial induction heating operation starts. Before, all the heating regions can be notified to the user by the light emission and lighting of the individual light emitting unit 276 and the wide area light emitting unit 277. After that, after the user selects the heating source and the heating operation is started, the light emission and lighting state of the individual light emitting unit 276 and the wide area light emitting unit 277 can be visually recognized by the user. The optimum place where the pan (the object N to be heated) is placed can be found even in the preparatory stage before placing the), which is convenient for the user.
Moreover, since the high temperature notification is also performed using the individual light emitting unit 276 and the wide area light emitting unit 277, a highly safe cooker can be provided without increasing the number of parts.

  Next, after the wide-area light emitting unit 277 changes the light emission form from yellow light emission, lighting state (form 1) to red light emission, lighting state (form 2) (ST10), the sub-heating coil that performs cooperative heating operation The operation when switching from SC1 to SC2 will be described with reference to FIG.

  As described above, when the user moves the elliptical pan (object to be heated N) on the top plate 21 to the left, for example, the object to be heated placement determination unit 280 has the main heating coil MC and the sub heating on the left side. It is determined that the same elliptical pan (object to be heated N) is placed above the coil SC2, and determination information to this effect is output to the energization control circuit 200.

  In FIG. 37, when the energization control circuit 200 detects this based on the discrimination information from the article placement determination unit 280 (ST10A), it stops the control of the sub inverter circuit SIV1 corresponding to the sub heating coil SC1. Thus, the main inverter circuit MIV and the sub inverter circuit SIV2 are controlled so that only the main heating coil MC and the specific sub heating coil SC2 on the left side are operated in conjunction with each other. Thus, high frequency power is supplied from the respective inverter circuits MIV and SIV2 to the two heating coils MC and SC2 at a predetermined heating power ratio. Then, energization of the right side sub-heating coil SC1 is stopped, and cooking is performed to cook with a thermal power of 3000 W with a “thermal power” (for example, 3000 W) already being executed and a predetermined thermal power distribution (for example, the left IH heating source 6L) In this case, since the main heating coil MC is 2400 W and the sub-heating coil SC1 is 600 W, 4: 1) is maintained and cooking is continued as it is. This thermal power of 3000 W continues to be displayed as numbers and letters by the display screen 100 and the left thermal power display unit 101L (ST10B).

  Further, the fact that the sub-heating coil that is performing the heating operation is switched from SC1 to SC2 is displayed in the corresponding area 100L1 of the integrated display means 100 by characters, figures, or the like. It may be displayed in the corresponding area 100L2.

  Then, unless the user changes the heating power setting in the next step ST10C, the process of ST8 to ST10 is repeated until a heating / cooking stop command is received from the user, and when the heating / cooking stop command is received from the user, or If the energization control circuit 200 determines that a predetermined set time has elapsed (time-up) during timer cooking, the process jumps to ST14 in FIG. 36, and the energization control circuit 200 displays the main heating coil MC and the current time. The energization of all the sub-heating coils SC1 to SC4 that have been driven to heat is stopped and the process is terminated (ST14 to ST16).

  The end of the heating operation is displayed in the corresponding area 100L1 of the display screen 100. Further, unless the user turns off the voice synthesizer 315 with a switch (not shown), the end of driving is also notified at the same time by voice as in ST10. In addition, in FIGS. 35-38, although the control program was demonstrated with a series of flowcharts, the determination process (ST2) of whether there is abnormality, the mounting presence-absence determination process (ST5), pan appropriateness determination process (ST6) ) Etc. are prepared as subroutines. The subroutine is interrupted at an appropriate timing with respect to the main routine that determines the heating control operation. During actual induction heating cooking, abnormality detection and pan presence detection are executed many times. ing.

On the other hand, a case where the user changes the heating power setting during the heating of the “large-diameter pan” in step ST10C will be described.
The induction heating cooker according to the second embodiment includes a main heating coil MC that heats an object to be heated N placed on the top plate 21, and a plurality of the heating coils that are installed adjacent to the outside of the main heating coil. A sub-heating coil group SC composed of the sub-heating coils SC1 to SC4, a main inverter circuit MIV for supplying a high-frequency current to the main heating coil MC, and a high-frequency current for each sub-heating coil of the sub-heating coil group independently. Sub-inverter circuit groups SIV1 to SIV4 to be supplied, and a heated object placement determination unit 280 that determines whether or not the same heated object N is placed on the main heating coil and the first and / or auxiliary heating coil, Input units 64R, 64L, 70, 71, 72, 90, 94, 142 to 145 for setting the heating power during induction heating operated by the user, and setting information of this input unit are displayed. The display screen 100, the left heating power display unit 101L, and the output of the main inverter circuit MIV and the sub inverter circuit groups SIV1 to SIV4 are independently controlled based on the setting information of the input unit and the display screen 100 is controlled. An energization control circuit 200, and the energization control circuit 200 starts a cooperative heating operation by the main heating coil MC and the sub heating coil group SC based on information from the heated object placement determination unit 280. The output of the main inverter circuit MIV and the output of the sub inverter circuit groups SIV1 to SIV4 are controlled to a predetermined distribution so that the predetermined heating power set by the user is obtained, and then the number of the sub heating coils SC performing the cooperative heating operation is In the state of increase, decrease, or switching to another sub-heating coil, the output distribution before the change is maintained and the display screen 100 and the left Display unit 101L is characterized by the increase in the number of sub-heating coils during the cooperative heating operation, reduction or other regardless of the switching of the sub-heating coils, it is a configuration of a display which the predetermined heating power visible.

  If it is determined in ST10C of FIG. 37 that there is a heating power change command, the process proceeds to ST17 of FIG. In ST17, it is determined whether the thermal power after the change is larger or smaller than a predetermined thermal power level (for example, 501W). If the thermal power is changed to a thermal power larger than the predetermined thermal power, the process proceeds to ST18, and the energization control circuit 200 performs the control. A predetermined thermal power distribution is maintained. That is, in the example of 3000 W described above, when the thermal power being executed is 3000 W, the predetermined thermal power distribution is 2400 W for the main heating coil MC and 600 W for the sub-heating coil SC2, which is 4: 1. Is maintained. Then, the set thermal power after the change is displayed by the energization control circuit 200 in the corresponding area 100L1 of the display screen 100 as “1KW during thermal power”. Further, a thermal power level corresponding to 1000 W is also displayed on the left thermal power display unit 101L by a band of light.

  On the other hand, when it is changed to a thermal power smaller than a predetermined thermal power level (501W) (there are three types of 150W, 300W and 500W), the process proceeds to step 19 in the process of step 17, so that another thermal power distribution is made. The energization control circuit 200 outputs a control command signal to the main inverter circuit MIV and the sub inverter circuit groups SIV1 to SIV4. For this reason, the difference in the heating power between the main heating coil MC and the sub heating coil SC is maintained at a constant rate regardless of whether the number of sub heating coils SC to be cooperatively heated is one or more. The changed thermal power and the changed thermal power are displayed in the corresponding area 100L1 of the integrated display means 100 as “thermal power: small 500 W”. Further, the thermal power level corresponding to 500 W is also displayed on the left thermal power display portion 101L by a light band. Note that the left thermal power display unit 101L can display only seven levels, and cannot directly display eleven levels of thermal power values as in the display screen 100, for example, a thermal power value of 500 W or less (150 W, 300 W and three 500 W). Are displayed together on one level. For example, it is displayed with the name “low heat power” group.

Specific examples of typical thermal power and main / sub thermal power ratios are shown in FIGS.
FIG. 39A shows the heating power values (W) of the main heating coil MC and the auxiliary heating coils SC1 to SC4 when the maximum heating power is 3 KW, and the heating power ratio of the main heating coil and the entire auxiliary heating coil is fixed to 4: 1. is there.

  FIG. 39B shows the heating power values (W) of the main heating coil MC and the auxiliary heating coils SC1 to SC4 when the heating power is 6 (1500 W), and the heating power ratio between the main heating coil and the entire auxiliary heating coil is fixed to 4: 1. This is the case.

  FIG. 40A shows the heating power values (W) of the main heating coil MC and the auxiliary heating coils SC1 to SC4 when the heating power is 3 (500 W), and the heating power ratio between the main heating coil and the auxiliary heating coil is changed to 3: 2. This is the case.

  On the other hand, when the thermal power is changed to a thermal power smaller than a predetermined thermal power level (501W) (three of 150W, 300W and 500W), when the thermal power ratio is 4: 1, the minimum driving thermal power of the sub-heating coil SC is driven at 50W or less. That is a problem. For example, as shown in FIG. 40 (B), if a thermal power of 500 W is obtained at a thermal power ratio of 4: 1, the sub-heating coil SC is driven with a small thermal power of 25 W or 33 W.

  That is, since the individual impedances of the metal pans to be heated N are different in the actual product, the ratio of being put into the pans and converted into heat is not constant even when a high frequency power of a predetermined value or more is applied. Thus, as described in the present embodiment, the current detection sensor 227 detects the current flowing through the resonance circuit composed of the parallel circuit of the heating coil 6LC and the resonance capacitor 224L, and determines whether or not there is an object N to be heated. Judgment of whether or not the pan is unsuitable for heating (object to be heated N), and whether or not an excessive current or an excessive current with a difference of a predetermined value or more compared to the normal current value is detected. It is used for. Thus, the current applied to the induction heating coil is finely controlled so as to exert the designated heating power. Therefore, when the thermal power setting is reduced, there is a problem that the current that flows is very small and cannot be detected accurately. In other words, when the thermal power is large, it is relatively easy to detect the current component flowing in the resonance circuit, but when the thermal power is small, the thermal power change cannot be accurately handled unless measures such as increasing the sensitivity of the current sensor are implemented. This is because an accurate fire power limiting operation as intended cannot be performed.

  Although not shown in the figure, as described above, an input-side current sensor that also detects the input current value of the power source for the inverter circuits MIV and SIV1 to SIV4 is provided. It is also possible to perform appropriate control by using both of the current values on the output side of the coil by the current sensor.

  The sub-heating coil SC is also formed of a collective line consisting of thin wires of about 0.1 mm to 0.3 mm in a spiral shape, similar to the main heating coil of the left heating coil 6LC, but induction heating occurs. Since the cross-sectional area itself through which the current flows is small, it is not possible to input a large driving power as compared with the main heating coil MC, and the maximum heating capacity is relatively small. However, as described above, if the wire diameter of the thin coil of the single coil is further reduced and the surface area of the coil conductor is increased by winding more, the skin resistance is reduced even if the drive frequency of the sub inverter circuits SIV1 to SIV4 is increased. It is possible to continuously control a smaller heating power while suppressing loss and suppressing temperature rise.

Therefore, in the second embodiment, the control is performed not to fix the thermal power ratio at 4: 1, but to change to 3: 2 when the thermal power is small.
In the case of thermal power 120W or 300W, even if the thermal power distribution 3: 2 may not be maintained, the minimum driving thermal power 50W or more may not be maintained. “Cooking is not possible. Set the heating power to 500 W or more” is displayed to prompt the user to change the heating power, or control is performed such as limiting the heating to only the main heating coil MC. Since it is difficult to imagine a scene where a large pan that straddles both the main heating coil MC and the sub-heating coil SC is actually heated at 120 W or 300 W, there is no concern of impairing actual usability even if the above control is performed. .

  During the cooperative heating operation, the energization control circuit 200 controls the amount of power supplied to each of the main heating coil MC and the sub heating coil groups SC1 to SC4 so that the heating power ratio, that is, the main / sub heating power ratio is in a substantially constant range. However, as described above, it is difficult to keep the amount of power applied low when setting a small thermal power, so control is performed to reduce the amount of power per unit time by limiting the actual power supply time. May be. For example, if the power application time is reduced to, for example, 50% from the sub inverter circuits SIV1 to SIV4 to the sub heating coils SC1 to SC4 by the conduction rate control, the amount of power per unit time that actually contributes to heating is set to 50%. It is possible. In other words, if it is difficult to reduce the thermal power only by limiting the frequency of the power to be applied, the power that acts more substantially by reducing the ratio of the time to supply power and the time to not supply power by energization rate control, Since it is possible to narrow down to a smaller value, such control may be adopted.

  In the second embodiment of the present invention, the thermal power ratio between the main heating coil MC and the sub-heating coil groups SC1 to SC4 is maintained substantially constant during the cooperative heating. However, the thermal power ratio is always maintained in every scene during the cooperative heating. Is not guaranteed to be maintained at a “predetermined ratio”. For example, during the heating drive, since the control is always performed to detect the difference between the current flowing in the input side and the output side of the inverter circuit and to feed back the result to the energization control circuit 200, the user can set the heating power. If changed, the control may be transiently unstable immediately after the change, and may temporarily deviate from the target heating power ratio. In addition, when the pan is moved sideways during cooperative heating or lifted for a short time, such a behavior is detected by the current sensors 227, 267A to 267D, and it is possible to identify whether or not it is an incorrect usage method. It is necessary, and it takes time to select an appropriate control method.

  Until this identification or execution of adaptive control is confirmed, the target heating power ratio may be temporarily deviated. If the user can confirm that the heating power set by the user has not been changed unintentionally, rather than knowing the instantaneous change in applied current, the user will not feel uneasy during the cooking process.

  Even if the user does not change the heating power setting, if the user selects another cooking, the heating power ratio between the main heating coil MC and the sub-heating coil groups SC1 to SC4 may change. For example, when a large frying pan having a rectangular outer shape is used and several hamburgers are baked by placing it on the top plate 21 so as to be long in the front-rear direction and slightly to the left of the center point X1, FIG. Heating is performed by the main heating coil MC and the second sub-heating coil SC2 diagonally left front and the fourth sub-heating coil SC4 diagonally left rear.

  For example, a heating power of 1500 W or 2000 W is recommended so that the temperature of the entire bottom surface of the frying pan rises on average, and a control target value for the amount of power supplied to the main heating coil MC and the sub-heating coils SC2, SC4 is set at a predetermined heating power ratio. However, if the same frying pan is placed in the same position and then fried with 2000W or 1500W using several eggs this time, the cooking ingredients (melted eggs) spread thinly over the entire bottom of the frying pan. There is a case where the cooked result is better when the temperature rise in the peripheral part is made faster than the central part of the bottom and the heating power in the peripheral part is slightly increased.

  Therefore, in the case of such cooking, the heating power of the entire two sub-heating coils SC2, SC4 is made larger than the heating power of the main heating coil MC. Thus, depending on the actual cooking content, it is desirable to change the heating power ratio between the main heating coil MC and the sub-heating coil groups SC1 to SC4 (even at the same heating power level).

  Further, as described in the first embodiment, in the case of such a cooking menu in which temperature uniformity is important, for example, during a predetermined time from the start of heating, the main heating coil MC in the center is driven with the final heating power. At the same time, the sub-heating coils SC1 to SC4 that participate in cooperative heating are driven with a larger heating power (turned on), so that cooking such as heating only the pan skin (the side of the pan) such as a frying pan is realized. it can.

  In the second embodiment, the main heating coil MC side is set so as to exert a larger heating power than the heating power of the sub heating coil groups SC1 to SC4 as a whole, but the present invention is not limited to this. It is not something. Various changes can be made depending on conditions such as the structure and size of the main heating coil MC side and the individual sub heating coils SC1 to SC4, or the number of sub heating coils SC installed, for example, the sub heating coil groups SC1 to SC4. The total thermal power may be larger than the thermal power of the main heating coil MC, or both may be the same.

  However, when considering the use in a general household, a normal circular pan, for example, a pan having a diameter of about 200 mm to 240 mm is frequently used. When such a general pan is used, Since the heating coil MC alone performs induction heating, it is desirable to take into consideration that the minimum heating power necessary for such cooking can be exhibited. When used in general households, it is considered that regular-sized pans are used frequently and large-diameter pans are used less frequently. Considering this, the central heating coil is called the main heating coil MC.

  When cooperative heating is performed, that is, when two or more independent induction heating coils are driven and magnetically linked within a certain period of time, the operation timings of the main inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 can be matched. It is desirable from the viewpoint of stable and reliable control. For example, it is desirable to match at least one of heating start timing, heating stop timing, and heating power change timing by the main inverter circuit MIV and the first sub inverter circuit SIV1. As an example of this, when the operation is switched from the state in which the main inverter circuit MIV and the first sub inverter circuit SIVI are simultaneously operated to the second sub inverter circuit SIV2, the main inverter circuit MIV and the first sub inverter circuit are switched. It is conceivable that the operation of SIVI is stopped in synchronization, and then the main inverter circuit MIV and the second sub inverter circuit SIV2 are started to be driven simultaneously.

  The main inverter circuit MIV and each sub-inverter circuit SIV are limited to a predetermined low heating power only for a predetermined time (for example, 10 seconds) immediately after driving, and there is an abnormality as shown in FIG. 36 within this predetermined time. Whether or not the determination process (ST2), pan placement presence / absence determination process (ST5), pan appropriateness determination process (ST6), etc. are interrupted. The control may be such that cooking is continued by increasing the set thermal power.

  In the above example, a description has been given of a resonance circuit composed of a parallel circuit of a heating coil and a resonance capacitor as an example, but a resonance circuit composed of a series circuit of a heating coil and a resonance capacitor may be used.

  In the second embodiment, the display screen 100 includes the first induction heating unit 6L, the second induction heating unit 6R, the third induction heating unit 6M, and the radiant electric heating sources (heaters) 22, 23. In addition to being able to display the operating conditions of the four heat sources individually or simultaneously, the start and stop of the heating operation can be commanded by touching the input keys 141 to 145, and the energization conditions can be set. Such an energization control circuit 200 may not be provided with an input function but limited to a simple display function.

  Furthermore, the heated object placement determining unit 280 that determines whether or not the same pan (object to be heated N) is placed above the main heating coil MC and the auxiliary heating coils SC1 to SC4 is the above embodiment. Whether there is a pan (the object to be heated N) above the sensor in addition to the one that detects the temperature like the infrared sensor 31 described in the above or the one that detects the current flowing through the heating coil like the current detection sensor 227 A means for optically detecting the above may be used. For example, when there is a pan (the object to be heated N) above the top plate 21, lighting equipment on the ceiling of the kitchen or sunlight is not incident, but when there is no pan (the object to be heated N), the illumination light or Since disturbance light such as sunlight is incident, these changes may be detected.

  In addition to the method of determining the material of the pan (the object to be heated N) based on the current flowing in the heating coil and the input current flowing in the inverter circuit, for example, based on the current flowing in the heating coil and the input current flowing in the inverter circuit A method of using other electrical characteristics such as a method of determining the material of the pan (the object N to be heated) can be considered. For example, Japanese Patent Laid-Open No. 2007-294439 introduces a technique for discriminating the material and size of an object to be heated based on the input current value to the inverter circuit and the current value flowing through the heating coil. .

  In the second embodiment of the present invention, the same object pan (object N) is placed on the main heating coil MC and one or more sub-heating coils SC1 to SC4. Although the determination unit 280 has described “determine”, it does not determine that there is actually one pan. In other words, the process of counting the number of pans actually placed is not adopted. In this type of induction heating cooker, it is difficult to assume that a plurality of objects to be heated N are simultaneously placed on one induction heating coil. Current sensors 227, 267A to 267D detect the magnitude of the impedance of the main heating coil MC and one or more sub-heating coils SC1 to SC4. N) "is on the list.

  In other words, as shown in FIG. 25, the object placement determination unit 280 knows the magnitude of the current flowing through the main heating coil MC and the one or more sub-heating coils SC1 to SC4. I understand. Therefore, when the impedance value is within a predetermined range, a determination signal indicating that the same pan (object to be heated N) is placed is transmitted to the energization control circuit 200. Similarly, when the infrared sensor 31 detects the temperature, the same pan (object to be heated N) is placed from the comparison result of whether or not the detection temperatures of the infrared sensors 31 corresponding to the plurality of heating coils are equal. The heated object placement determining unit 280 determines that the light receiving amount is changed, and the light receiving amount changes depending on the presence / absence of the pan as described above. It is practical to treat the pan on the main heating coil MC and the one or more sub-heating coils SC1 to SC4.

  As described above, the object to be heated N is placed so that the object to be heated placement determination unit 280 extends over the four sub-heating coils SC1 to SC4 above and around the main heating coil MC. If it is determined that it is placed, the first stage before starting induction heating (after the abnormality detection process is finished), as shown in FIG. In the same manner as in the first mode, seven items of “high-speed heating”, “fried food”, “water heater”, “preheating”, “rice cooking”, “boiled”, and “water heater + heat retention” are displayed.

  Therefore, when touching, for example, the high-speed heating key portion among the seven keys E1A, E1B, E1C, E2A, E2B, E3A, and key E3B for selecting the cooking menu, as shown in FIG. The menu is selected and the fact that “fast heating” has been selected is displayed in text. In FIG. 34, execution of high-speed heating is shown by continuing to display the selection key E1A itself.

  Also in the second embodiment, when this high-speed heating is selected, the heating power applied to the object to be heated N can be manually set, and the total heating power of the main heating coil MC and the sub-heating coil is 120 W as in the first embodiment. The user can arbitrarily select from the range up to 3000 W.

  The energization control circuit 200 is automatically set so that the main / sub heating power ratio between the main heating coil MC and the sub heating coils SC1 to SC4 does not exceed the total heating power selected by the user and is within the predetermined heating power ratio range. It cannot be set arbitrarily by the user. Further, the directions of the high-frequency currents in the adjacent regions of the main heating coil MC and the sub-heating coils SC1 to SC4 are controlled to coincide.

Further, if the “boiled” selection key E1C among the seven keys for selecting the cooking menu is touched, the “boiled” cooking menu can be performed. For example, even in the case of using a large-diameter and deep “pasta pan” used mainly for the purpose of boiling pasta, the second embodiment can boil hot water at a high speed and shift to cooking by boiling.

  For example, the default value of the thermal power is 2000 W, but the user may set the thermal power to 3000 W from the beginning and start heating. In this case, the main / sub heating power ratio is automatically determined by the control unit (energization control circuit) 200 and does not need to be arbitrarily set by the user. For example, the main heating coil MC has a heating power of 1000 W, and the four auxiliary heating coils Is set to 2000W. When the water boils, the energization control circuit 200 issues a notification signal and displays a message prompting the user to insert pasta and noodles in a predetermined guide area 100GD of the integrated display means 100. Notify you. At this time, if the heating power is not set again, a notification that the heating power is automatically lowered is given.

  When the user does not perform any operation, as in the first embodiment, the energization control circuit 200 outputs a command signal for reducing the thermal power to the main inverter circuit MIV and the sub inverter circuits SIV1 to SIV4 as in the boiling state. When the user sets the thermal power again, or touches the input key “start with firewood” that appears in the predetermined display area 100L2 of the integrated display means 100, the 3000W heating is started again. The sub-heating coil is divided into, for example, two sets of SC1 and SC2, and two sets of SC3 and SC4. These two sets are alternately set for 15 seconds each, and the total sum of thermal power of each set is set to 1500 W. To heat.

  In this way, after boiling, control for promoting convection of hot water is automatically performed. In addition, even if a user reduces a thermal power to less than 3000 W, for example, 2000 W or 1000 KW immediately after boiling, the heating operation by the same convection promotion control is performed within a range not exceeding the sum of the thermal power.

  In the second embodiment, as shown in FIG. 20, a left heating power display unit 101L is arranged in front of the first induction heating unit 6L, and a rectangular shape is formed so as to straddle the left and right center line CL1 of the main body A. A display screen 100 is arranged. Compared with the facing distance between the display screen 100 and the heating coil 6LC, the facing distance between the thermal power display unit 101L and the heating coil 6LC is significantly smaller. In other words, the left thermal power display unit 101L is located close to the heating coil 6LC. . However, since the outer diameter of the heating coil 6LC must be increased in order to heat the object N having a large outer diameter by the first induction heating unit 6L, the component storage chamber having a limited flat area is required. 10, it is difficult to increase the facing distance between the thermal power display unit 101L and the heating coil 6LC. Therefore, in the second embodiment, the positional relationship between the left heating power display unit 101L, which may be affected by the leakage magnetic field of the first induction heating unit 6L, and the side heating coil SC in the closest position. Is devised.

  Specifically, as shown in the second embodiment, a predetermined space 273 formed between the second sub-heating coil SC2 and the first sub-heating coil SC1 is located at the center rear of the thermal power display unit 101L. I am doing so. As a result, even when the second side (secondary) heating coil SC2 and the first side (secondary) heating coil SC1 are simultaneously driven at a high heating power, for example, 1500 W · 1500 W, these two side (secondary) heating coils SC1. ) It can be expected that the strength of the magnetic field toward the left heating power display unit 101L is weakened by the interaction of the magnetic fields generated between the facing ends of the heating coils SC1 and SC2.

  As described above, the induction heating cooker according to the second embodiment includes the first induction in the rectangular component chamber (component storage chamber) 10 in the main body A whose top surface is covered with the top plate 21. Inverter circuits MIV and SIV that house a heating unit 6L and a thermal power display unit 101L having a thermal power display screen and supply a high-frequency current to the first induction heating unit 6L, and the inverter circuit and the display unit 101L The induction heating unit 6L includes an annular main heating coil MC in the center, and a plurality of induction heating units MC that are arranged in the vicinity of the induction heating unit 6L and maintain a predetermined space 273. A side heating coil SC, and the energization control circuit 200 drives the inverter circuits MIV and SIV to heat the main heating coil MC alone and the main heating coil MC and the side heating coil. A cooperative heating the SC to allow each other across the space 273 between the side heating coils SC mutual is obtained by placing the display unit 101L in the direction opposite to the main heating coil MC. As a result, the main heating coil MC can be heated alone and the main heating coil MC and the side coil SC can be heated together on the top plate 21 of a limited area. And the usability is improved, and the thermal power display unit 101L can be protected from the influence of magnetic flux leaking from between two adjacent side heating coils SC1 and SC2, and stable display operation can be achieved. You can expect.

  In the second embodiment, on the display screen 100 for displaying the heating conditions, the seven cooking menus E1A, E1B, E1C, E2A, E2B, E3A, and the key E3B selection key are selected by the user. Displayed in a possible state. For this reason, the heating drive pattern that matches with the selection of the desired cooking menu is automatically determined by the control unit, so that the heating coil according to the user's purpose and desire such as emphasizing heating time and temperature uniformity is desired. In addition to being driven, there is an advantage that the misuse of the user can be eliminated and the mental burden can be reduced by operating the selection key of the cooking menu on the display unit.

  Moreover, the induction heating cooking appliance which concerns on this Embodiment 2 has the main-body part A equipped with the top plate 21 in which the to-be-heated material N, such as a pot which puts to-be-cooked, is mounted in the upper surface, Below the top plate 21 First induction heating unit 6L and second induction heating unit 6R arranged adjacent to each other, inverter circuits 210R and 210L for supplying induction heating power to induction heating coils 6RC and 6LC of these heating units, and this An energization control circuit 200 for controlling the output of the inverter circuit, and an operation unit E for instructing the energization control circuit 200 to start heating, set a heating power, etc., and the inside of the main body A below the top plate 21 Includes a storage space 10 having a horizontal rectangular shape in a plan view for storing the induction heating coils of the first and second induction heating units 6L and 6R, and the first induction heating unit 6L is a circular central coil. Main heating coil) MC and a plurality of elongated side coils SC1 to SC4 arranged around the main heating coil MC, and the circular heating coil 6RC of the second induction heating source 6R includes the side coils. The diameter is smaller than the diameter of the circle (about 200 mm) and larger than the outer diameter (about 130 mm) of the central coil MC (about 180 mm), and the first induction heating unit 6L is an induction by the central coil MC alone. The heating and the cooperative heating of the central coil MC and the side coils SC1 to SC4 can be switched automatically or manually according to the size of the object N to be heated. Thus, on the top plate 21 having a limited area, three heating means, that is, central coil MC single heating, central coil MC and side coils SC1 to SC4 cooperative heating, and second induction heating source 6R single heating are performed. It can be selected, and can correspond to a heated object N having a wider size than a conventional two-mouth type cooker having only two types of circular heating coils, so that the usability can be improved.

Embodiment 3 FIG.
FIGS. 41-46 shows the induction heating cooking appliance which concerns on Embodiment 3 of this invention, FIG. 41 is a top view of the state which removed the top plate 21. FIG. FIG. 42 is an explanatory view of the arrangement of the heating coil and the display unit. FIG. 43 is an explanatory diagram showing the relationship between the heating coil of the second induction heating source and the inverter circuit. FIG. 44 is an explanatory diagram showing the operation of the display screen of the integrated display means and the thermal power display unit of the induction heating cooker according to Embodiment 3 of the present invention. FIG. 45 is an operation explanatory view 1 showing a modification of the display screen of the integrated display means of the induction heating cooker according to the third embodiment of the present invention. FIG. 46 is an operation explanatory view 2 showing a modification of the display screen of the integrated display means of the induction heating cooker according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the structure of the said Embodiment 1, or an equivalent part. Unless otherwise specified, the terms used in Embodiment 1 are also used in the same meaning in Embodiment 3.

  The feature points of this third embodiment are that the left and right thermal power display units 101L and 101R are illuminated by light emitting diodes, and the left liquid crystal display unit 45L is positioned close to the front of the first induction heating unit 6L. It is at the point where it was placed. Further, the heating coil 6LC of the first induction heating unit 6L is composed of double annular coils 6LC1 and 6RL2 that are independently heated and driven.

  Inside the main body case made of a metal plate constituting the outer shell of the cooker, there is a rectangular component storage chamber 10 having a width dimension W3 and a depth dimension DP2.

6LC is a heating coil of the 1st induction heating part 6, and has the main heating coil MC and the four side part (sub) heating coils SC1-SC4 similarly to the said Embodiment 1. FIG. As shown in FIG. 43, the main heating coil is constituted by an annular inner heating coil 6LC1 and an annular outer heating coil 6LC2 surrounding the space XX.
R1 is the radial dimension of the main heating coil MC and is 65 mm. DA is 130 mm in diameter of the main heating coil MC. DE is the diameter dimension of the inner heating coil 6LC1 and is about 50 mm. The coil widths of the inner heating coil 6LC1 and the outer heating coil 6LC2 are both about 10 mm. The diameter of the central circular space XX is about 30 mm. An infrared temperature sensor 31L1 for detecting the temperature of the object to be heated N is installed in a space XX having a diameter of about 30 mm formed at the center of the inner heating coil 6LC1.

  MIV1 is an inverter circuit that drives the inner heating coil 6LC1, and MIV2 is an inverter circuit that drives the outer heating coil 6LC2.

Reference numeral 100 denotes a liquid crystal screen of the integrated display means G, which is disposed at an angle of about 45 degrees to the right front from the center point X1 of the first induction heating unit 6L. 45L is a left liquid crystal display screen, and 45R is a right liquid crystal display screen.
The left liquid crystal display screen 45L is disposed at an angle of about 45 degrees to the left front from the center point X1 of the first induction heating unit 6L.

  As shown in FIG. 41, when viewed from the center point X1 of the first induction heating unit 6L, there is a first sub-heating coil SC1 right next to the right side, and a second sub-heating coil SC2 on the front side. There is a fourth sub-heating coil SC4 on the left side. That is, the sub-heating coils SC1 to SC4 are arranged at equal intervals and at equal angles with an angle of 90 degrees with respect to the left and right center line CL4. Accordingly, when viewed from the center point X1, the display screen 100 is on an extension line of the space 273 formed between the first sub-heating coil SC1 and the second sub-heating coil SC2, and the second sub-heating coil. The left liquid crystal display screen 45L is on the extended line of the space 273 formed between SC2 and the fourth sub-heating coil SC4.

  101L is a left thermal power display unit, and 101R is a right thermal power display unit. Although these two thermal power display units are not shown, a plurality of light emitting diodes are connected in parallel to the display drive circuit 215 similar to that of the second embodiment in accordance with the number of thermal power stages. For example, in the third embodiment, there are seven (or seven sets) of light emitting diodes so that the setting of the heating power can be set to seven stages, and the number of diodes that emit light increases as the heating power increases by one stage. The light emitting diodes are arranged in a straight line, and when the heating power is increased or decreased, the light emitting section is increased or decreased accordingly, so that the user can easily see the magnitude of the heating power.

  The shortest distance from the outer peripheral surface of the heating coil 6LC of the first induction heating unit 6L to the display screen 100 is 60 mm. This shortest distance corresponds to WX in FIG. 20 of the second embodiment. The shortest distance from the outer peripheral surface of the heating coil 6LC of the first induction heating unit 6L to the left liquid crystal display screen 45L is 50 mm, and the shortest distance to the left heating power display unit 101L is about 30 mm. This distance of about 30 mm corresponds to WY in FIG. 20 of the second embodiment.

  Reference numeral 122 denotes a high temperature notification unit, in which three light emitting diodes are arranged side by side. When the temperature of the top plate 21 becomes a predetermined temperature, for example, 55 degrees or more, red light is emitted above the top plate 21 and used. Inform the person that the temperature is high.

  46 is a front part case which is integrally formed of an electrically insulating material such as plastic, and on the part case, the display screen 100, the high temperature notification unit 122, the left and right liquid crystal display screens 44L and 45R, and All the thermal display units 101R and 101L are installed.

  The four sub-heating coils SC1 to SC4 of the first induction heating unit 6L have a lateral width WA of 48 mm and a major axis dimension of 130 mm. The coil width W31 is 15 mm, and the width of the space portion 272 therein is 18 mm. The width of the space 271 is 10 mm. The maximum outer diameter DB of the heating coil 6LC of the first induction heating unit 6L including the four sub-heating coils SC1 to SC4 is 244 mm. In addition, the magnetic-shielding ring as shown in Embodiment 2 is installed in the outermost peripheral part of the heating coil of each induction heating part.

  In the third embodiment, as shown in FIG. 41, the left heating power display unit 101L is arranged in front of the first induction heating unit 6L, and the rectangular shape so as to straddle the left and right center line CL1 of the main body A. A display screen 100 is arranged. Compared with the facing distance between the display screen 100 and the heating coil 6LC, the facing distance between the thermal power display unit 101L and the heating coil 6LC is significantly smaller. In other words, the left thermal power display unit 101L is located close to the heating coil 6LC. . However, the thermal power display unit 101L has a simple circuit configuration in which only seven (or seven sets) of light emitting diodes are connected in parallel, and a group of minute electrodes formed on the liquid crystal screen and image information are recorded on the recording medium. Since there is no processing circuit for reading, writing, or calculating from the above, there is almost no fear of malfunction even if it is exposed to a leakage magnetic field.

  On the other hand, the display screen 100 and the left liquid crystal display unit 45L process the image information by reading the image information and applying a voltage to the electrodes by the display driving circuit 215, as described in the first embodiment. Since the display content is changed in real time as the cooking progresses, it is desirable to avoid the leakage magnetic field. Therefore, in the third embodiment, when viewed from the center point X1, the display screen 100 is placed on an extension line of the space 273 formed between the first sub-heating coil SC1 and the second sub-heating coil SC2. In addition, since the left liquid crystal display screen 45L is arranged on an extension line of the space 273 formed between the second sub-heating coil SC2 and the fourth sub-heating coil SC4, the first embodiment of the first embodiment is arranged. For the reason described with reference to FIG. 12, the influence of the magnetic field on the left liquid crystal display screen 45L and the display screen 100 can be reduced. Therefore, even if the liquid crystal display screen 45L and the display screen 100 display various images in real time during the cooking process, there is no fear of impairing the display operation.

  44A and 44B show examples of the display operation of the display screen 100 of the integrated display means G. FIG. When cooking by the first induction heating unit 6L, the character display 100Q for specifying the heating source “left IH” appears on the screen in this way. FIG. 44A shows a state in which one cooking menu name 100X “boiled” is displayed side by side on the character display 100MN “cooking menu”. This means that “boiled cooking” has been selected as the cooking menu, and the current heating operation is displayed with the characters 100P. At the same time, the stewed cooking is made up of two sub-heating coils among the four sub-heating coils SC1 to SC4, and the other two coils on the opposite side across the main heating coil MC. The characters 100AT indicate that the coil sets are alternately heated and driven with a predetermined heating power.

  The state of the display screen 100 shown in (A) of FIG. 44 is only for a short time of starting stewed cooking, for example, only 20 seconds. After that, the display screen 100 is automatically displayed on the display of (B) of FIG. Is switched by the display driving circuit 215. In the display screen 100 shown in FIG. 44B, 100J is a schematic figure of the main heating coil MC, and is displayed in a state of emitting red light when being heated. 100K is a figure which similarly shows four sub-heating coils SC1-SC4. If the user looks at the display of FIG. 44 (B), the main heating coil MC is driven by 500 W, and the two sub-heating coils are each driven by 500 W of thermal power. It can be easily understood with the wattage display displayed in the vicinity. The overall thermal power level is clearly indicated by the thermal power display character 100H.

  Also, what is shown in FIG. 44C is a schematic diagram of the thermal power display portion 101L on the left side. It is displayed in seven stages from thermal power level 1 (100 W) to thermal power level 7 of 3000 W. The fire power 3 in FIG. 44C is entirely red or orange, and the user can easily understand that the current fire power is at 3 levels.

  Note that the state of the display screen 100 shown in FIG. 44A is that the first sub-heating coil SC1 on the right side of the main heating coil MC and the second sub-heating coil SC2 in front of it are simultaneously driven. However, after a predetermined time, the image figures of the third and fourth sub-heating coils SC3 and SC4 are highlighted in red or the like, and the value of the thermal power is displayed in watts in the vicinity thereof. That is, during stew cooking, in this display screen 100, whether or not the main heating coil MC and the four sub-heating coils SC1 to SC4 are actually being heated, and if they are being heated, their thermal power Can be clearly identified to the user by the change in the number and color.

  FIGS. 45 and 46 are operation explanatory views showing modifications of the display screen of the integrated display means of the induction heating cooker according to the third embodiment of the present invention. The display includes not only a display but also an input function. The feature is the part G.

FIG. 45 shows a state of the display screen 100 activated by the energization control unit 200 when the use of the second induction heating unit 6R is selected by the heat source selection key of the upper surface operation unit 60 of the main body A.
FIG. 46 shows the state of the display screen 100 activated by the energization control unit 200 when the use of the first induction heating unit 6L is selected by the heat source selection key of the upper surface operation unit 60 of the main body unit A.

The display screen 100 is characterized in that a capacitive touch switch unit is arranged on the upper surface, and various input commands can be given to the energization control unit 200 in cooperation with the screen display.
Therefore, the entire upper portion of the display screen 100 constituted by the liquid crystal substrate is covered with a glass plate, and transparent electrode portions are formed on the lower surface of the glass plate by vapor deposition or adhesion at several places. The display drive circuit 215 drives the display screen 100 in accordance with the command of the energization control unit 200 from below corresponding to the electrode unit, and displays characters representing the input function, the outline of the switch, and the like at an appropriate timing.

  Therefore, when the user touches the surface of the glass plate corresponding to the display position, the touched position is detected by the energization control unit 200 and processed as a predetermined input command signal, whereby a predetermined input operation is performed. . Therefore, even if the part where the input key cannot be seen is touched, no effective input can be performed.

  Next, the display of the capacitance type input key and the display screen 100 as described above will be described. In FIGS. 45 and 46, 100MN is a key for calling a cooking menu. Even if this key is not pressed, the display key E1A for “high-speed heating”, the display key E1B for “boiling water”, and the display of “boiled” are displayed at the initial stage. Four keys E1C and “fried food” display key E3A are displayed simultaneously. Each time the menu call key 100MN is touched, the display keys sequentially selected from “high-speed heating” to “boiling water” and “boil” change, and when pressed four times, the display returns to “high-speed heating” again. For example, when “hot water” is selected, if the confirmation switch 146 is touched, “hot water” is confirmed. Reference numeral 150 denotes an input key for instructing the start and stop of the heating operation. When the touch operation is performed for the first time, the heating is started, and when touching during the heating operation, the heating is stopped.

  151 and 152 are a pair of thermal power input keys for increasing / decreasing the thermal power. Each time the input key 151E with a plus sign is touched once, the thermal power is increased by one level within the seven thermal power levels, and a minus sign is present. Conversely, every time the input key 152 is touched, the one-step heating power is lowered. Reference numeral 155 denotes a bar graph-like thermal power level display figure, and the result of the touch operation of the thermal power input keys 151 and 152 is reflected in real time.

  100T is a time display unit in which the heating operation time set by the user is displayed at the stage before the start of the heating operation, and the elapsed time since the start of heating is displayed. Similar to the guide area shown, it is a guide information display unit for displaying reference information regarding user operations and cooking, a caution display, and the like. The time is set by a dedicated input key provided on the upper surface operation unit 60 of the main unit A. The state of the display screen in FIG. 45 indicates that “high-speed heating” is selected as the cooking menu, and that the first set time ends in 12 minutes. The firepower level is 4.

  Next, when the second induction heating unit 6L is selected by a selection switch (not shown) of the upper surface operation unit 60, the energization control unit 200 controls the display drive circuit 215 to display the display screen 100 in FIG. A dedicated display image of the second induction heating unit 6L is displayed.

  In the first induction heating unit 6L, unlike the case of the second induction heating unit 6R, two cooking menu display keys of “boiling water + keeping warm” and “preheating” are displayed. Other display keys are the same as in the case of the first induction heating unit 6R. In addition, a schematic figure 100J of the main heating coil MC and a schematic figure 100K of the sub-heating coils SC1 to SC4 as shown in FIG. At that time, the thermal power value is displayed in units of watts (W) in the vicinity of the schematic figures 100J and 100K.

  For example, in the state shown in FIG. 46, two sub-heating coils are set as one set, and each is driven at 500 W, and after a predetermined time, another set of two sub-heating coils on the opposite side is driven. Show. The schematic figure 100K is a symbol indicating alternating energization. When the first induction heating unit 6L is used in this way, the display screen 100 is added with “boiling water + warming” and “preheating” in the cooking menu as described above, and the schematic figures 100J and 100K are displayed. Is done. Therefore, even if the main heating coil MC and the four sub-heating coils SC1 to SC4 are controlled in various energization patterns by the energization control unit 200, such energization patterns are displayed by the schematic figures 100J and 100K.

  In the guide information display unit 100GD, the display driving circuit 215 displays information useful to the user as necessary with characters and symbols as needed, and by the speech synthesizer 315 as shown in the second embodiment, Voice guidance is performed.

  Note that image information for displaying the various display keys E1B, E2A, E3B, etc. on the display screen 100 shown in FIGS. 45 and 46 and the various input keys 146, 150, 151, 152, 100MN, etc. is provided by the drive control circuit 215. It is stored in the display memory 215A.

  According to the third embodiment described above, the heating coil 6LC of the first induction heating unit 6L is divided into an inner annular coil 6LC1 having an outer diameter of 50 mm and an outer annular shape having an outer diameter dimension (DA) that surrounds the outer annular coil 6LC1. The coil 6LC2 is composed of two parts, and the heating coil 6LC is individually supplied with high-frequency current from the main inverter circuits MIV1 and MIV2, and the two annular coils 6LC1 and 6LC2 are heated independently of each other. Is done. For this reason, for example, only the inner annular coil 6LC1 can be driven to inductively heat the object N having a small diameter (for example, about 80 mm), while the outer annular coil 6LC2 and the inner annular coil 6LC1 are simultaneously driven ( Alternatively, a large diameter, for example, about 80 to 150 mm can be heated.

  The case where a current is passed through the inner coil 6LC1 and the outer coil 6LC2 to generate a magnetic field and the pan placed on the top plate 21 is heated will be described in more detail.

  When the same current is applied to the outer annular coil 6LC2 having a large diameter and the annular coil 6LC1 having a small diameter, the total amount of the magnetic field generated from the outer annular coil 6LC2 having a large flat area contributes to the heating of the pan. It becomes larger than the inner annular coil 6LC1.

  Furthermore, since the inner coil 6LC1 and the large-diameter outer coil 6LC2 have the same frequency of the current flowing therethrough, by changing the operating frequency and duty of the switching element, the inner annular coil 6LC1 and the outer coil 6LC2 are changed. The flowing current can be set to any different value within a certain range. When adjusting the power by changing the duty ratio, the duty ratio is 0.5 under the condition that the voltage value applied to the switching element is constant, that is, the conduction state and non-conduction of two switching elements connected in series The output is the largest when the state ratio is 1: 1.

  Further, since different currents can flow from the main inverter circuits MIV1 and MIV2 to the two heating coils, the amount of magnetic field generated from the heating coils inside and outside can be changed.

  Conventionally, the inner heating coil has a smaller heating coil diameter than the outer heating coil, so it is difficult to contribute to heating, and the magnetic field generated by the outer heating coil is large and the heating distribution has a donut shape. In the embodiment, by supplying separate coil currents on the inner side and the outer side, the coil current flowing in the inner annular coil 6LC1 is increased, and by increasing the heating amount, a uniform heating distribution can be obtained throughout the main heating coil MC. become able to.

  When heating a pan with a plurality of heating coils, the power applied to the pan is the sum of the power that each heating coil applies to the pan, and therefore, within a predetermined rated maximum heating power (for example, 2000 W), In proportion to the amount of heat generated by increasing the current flowing through the heating coil, the amount of power flowing through the outer heating coil may be reduced, and the temperature difference between the inner and outer heating coils can be reduced. .

  Further, by causing a large amount of current to flow through the inner heating coil 6LC1, the amount of heat generated can be increased even in the inner heating coil 6LC1 having a small number of turns. The magnetic field generated by the outer annular coil 6LC2 becomes so strong that the heating distribution is not averaged, and the heating distribution can be made closer to a uniform state as compared with the conventional example in which the heating intensity is large in a donut shape at the so-called outer peripheral portion. Therefore, an induction heating cooker with good cooking performance can be provided.

  Furthermore, when the inner annular coil 6LC1 and the large-diameter outer annular coil 6LC2 are electrically connected in series, the same current flows through these inner and outer heating coils. If the configuration of the assembly wires of these two heating coils (element diameter, number of wires, etc.) is the same, the area where current can flow is the same, so the loss per unit area generated in the heating coil is the same. Become.

  For this reason, it is good if the number of turns of the outer annular coil 6LC2 of large diameter and the number of turns of the inner annular coil 6LC1 are the same as in this embodiment, but if the number of turns of the outer annular coil 6LC2 is increased. In comparison, the outer coil having a large diameter is less likely to dissipate heat and the temperature rise is larger than that of the inner coil 6LC1.

  However, in the third embodiment, since the amount of electric power that flows to the outer heating coil 6LC2 can be reduced even in such a case where “the number of turns is different”, the maximum temperature of the heating coil can be lowered. This eliminates the need for an air path design that increases the cooling air volume from the blower in consideration of the maximum temperature, reduces the air volume for cooling the heating coil, and reduces the rotation speed of the blower. Silence can also be expected.

  As described above, the induction heating cooker according to the third embodiment includes the first induction heating unit 6L in the component chamber (component storage chamber) 10 of the main body A whose top surface is covered with the top plate 21. An inverter circuit 210L (MIV, SIV) that supplies a high-frequency current to the first induction heating unit 6L, and an energization control circuit 200 that controls the inverter circuit and the display unit G. The induction heating unit 6L includes an annular main heating coil MC in the center and a plurality of side heating coils SC arranged in the vicinity of the periphery and maintaining a predetermined space 273. The energization control circuit 200 drives the inverter circuit 210L (MIV, SIV) to perform independent heating of the main heating coil MC and cooperative heating of the main heating coil MC and the side heating coil SC, respectively. And ability across a space 273 between the side heating coils SC mutual is obtained by placing the display screen 100 of the display unit G in the direction opposite to the main heating coil MC. As a result, the main heating coil MC can be heated alone and the main heating coil MC and the side coil SC can be heated together on the top plate 21 of a limited area. The display screen 100 can be protected from the influence of magnetic flux leaking between the two adjacent side heating coils SC1 and SC2, and stable display operation is expected. be able to.

  In particular, when the display screen 100 is to display a cooking menu or “operating condition” of a heating source including the main heating coil MC and the plurality of sub-heating coils SC1 to SC4 like the first induction heating unit 6L, Although it is desirable that the area of the display screen is large, the structure of the display unit driving circuit 215 for driving such a display screen 100 is complicated and sophisticated, so that it is necessary to avoid an unexpectedly strong magnetic field and high heat in terms of stable operation. It is necessary from. In this regard, in the third embodiment, the display screen 100 and the fine electrode portion associated therewith, the electronic substrate of the display drive circuit 215, and the like are not easily affected by the leakage magnetic field from the first induction heating portion 6L. It is arranged at a place, and a reliable display operation can be expected over a long period of time.

  In addition, when the control of sequentially switching the energization to the first sub-heating coil and the second sub-heating coil or driving intermittently is performed, what kind of induction heating is performed on the user. If the convection promoting function as described above is exhibited, the display screen 100 or the display screen 100 as shown in FIGS. 44 and 46 of the third embodiment may be used. It is even better to display in real time on the liquid crystal display screens 45R, 45L, etc. with characters and symbols.

Embodiment 4 FIG.
47 and 48 show an induction heating cooker according to Embodiment 4 of the present invention. FIG. 47 is a plan view of the main body A, and FIG. 48 is a longitudinal sectional view taken along line D3-D3 of FIG. It is.

  Specifically, in FIG. 48, various built-in components in the space below the horizontal partition plate 25 that becomes the bottom wall surface of the upper part chamber 10 of the main body A are omitted. The feature of the fourth embodiment is that the heating coil 6RC of the induction heating unit 6R on the right side which is the second heating unit also has four oval shapes around the main heating coil MC as in the first embodiment. The reason is that the side (sub) heating coils SC1 to SC4 are used. Since the electrical circuit configuration and the driving method are the same as those shown in the first embodiment, description thereof is omitted.

  The maximum outer shape DBR of the heating coil 6RC is 300 mm, which is a diameter in a range including the four sub-heating coils SC1 to SC4. Incidentally, the maximum outer diameter DB (see FIG. 4) of the heating coil 6LC of the first induction heating unit 6L of the first embodiment was about 244 mm.

  6RM is a guide mark drawn on a concentric circle with reference to the center point X2 so as to include a substantially circular range including the four sub-heating coils SC1 to SC4, and is displayed on the upper surface of the top plate 21 by printing. Therefore, it is a measure of the position where the object to be heated N is placed, and roughly matches the induction heating area by the heating coil 6RC. Note that 6LM is a guide mark of the first induction heating unit 6L.

  Further, the feature of the fourth embodiment is that the component storage chamber 10 projects from the right wall 10R and the left wall 10L of the main body case 2 to the right side, the left side, and the front-rear direction, respectively. The overhanging portion of the component storage chamber 10 is surrounded by the flange portions 3R, 3L of the main body case 2, the vertical walls 3LT, 3RT at the outermost periphery of the flange portion, and the top plate 21.

  The purpose of expanding the component storage chamber 10 to the left and right in this way is to be able to store a larger heating coil. In the kitchen furniture KT such as a normal Japanese sink, the diameter of the installation port K1 is unified to a predetermined size (for example, 560 mm). It was expanded and expanded to the left and right of the installation port K1. As a result, the flat area of the component storage chamber 10 is increased, and the flat area of the top plate 21 is also greatly increased. Accordingly, two large pots can be placed side by side.

  In order to maintain the cooling performance of the heating coil, a space in which air flows is provided between the main heating coil MC and the four sub-heating coils SC1 to SC4, and the main heating coil MC and the four sub-heating coils SC are provided. A similar space is formed in the center of itself. The heating coil 6RC of the induction heating unit 6R may be configured by the inner annular coil 6RC1 and the outer annular coil 6RC2 as in the third embodiment (see FIG. 43). As shown in the third embodiment, an air circulation space is provided between the annular coil 6RC1 and the outer annular coil 6RC2.

  The maximum outer diameter DBX of the heating coil 6RC is 300 mm as described above, and the maximum outer shape DBL of the heating coil 6LC of the first induction heating unit 6L is also 300 mm. As shown in FIG. 47, the two heating coils 6LC and 6RC are installed in the ceiling portion of the component storage chamber 10 side by side with a predetermined facing interval W5. The facing interval W5 is 150 mm. An interval W3 (see FIG. 48) between the left wall 10L and the right wall 10R of the main body case 2 is about 550 mm. This is because the size of the installation port K1 is taken into consideration. In addition, the maximum horizontal width dimension inside the component storage chamber 10 becomes a size close to the horizontal width size W1, and is a size close to 800 mm.

  401R and 401L are exhaust ports formed through the top plate 21 at the rear of the top surface of the main body A, and the air introduced by a cooling fan (not shown) is used as the horizontal partition plate of the main body A. This is to be finally discharged through the exhaust chamber 12 partitioned above 25.

  Reference numeral 100 denotes a display screen as an integrated display means installed in the left and right central part of the component storage chamber 10, and a liquid crystal display used in common for the first induction heating unit 6L and the second induction heating unit 6R. It is a screen. 71 is an upper surface operation unit (on the left side) provided at the front end of the top plate 21 in front of the heating coil 6LC of the first induction heating unit 6L, and 70 is also in front of the heating coil 6RC of the second induction heating unit 6R. It is the upper surface operation part provided in (right side). In addition, the arrow shown with the broken line in FIG. 47 shows the flow of the wind which cools heating coil 6RC, 6LC. As shown in FIG. 47, wind for cooling the heating coil continuously flows also on the outer periphery of the magnetic shielding ring 291 on the outer periphery of the heating coils 6RC and 6LC.

In FIG. 48, reference numeral 290 denotes a plate-like coil support body, which has a large number of ventilation through holes in the vertical direction throughout, and the heating coils 6RC and 6LC are mounted thereon.
The coil support 290 is horizontally installed with a predetermined gap from the upper surfaces of the left and right flange portions 3R, 3L. The coil support 290 is also provided below the coil support 290 for cooling supplied to the inside of the component storage chamber 10. Air is circulated. Therefore, as shown in FIG. 48, a space 400 having a width of at least 10 centimeters is also provided between the vertical walls 3RT and 3LTX formed vertically from the ends of the flanges 3R and 3L of the main body case on the outside of the magnetic shielding ring 291. Is secured. This space is for heat dissipation from the heating coils 6RC and 6LC, and the metal vertical walls 3RT and 3LT are not abnormally heated even if there is some leakage magnetic flux from these coils.

  Below the coil support 290, the horizontal partition plate 25 described above is installed, and an interval of several centimeters or more is maintained between the coil support 290 and the coil support 290. This is for the purpose of efficiently flowing air for cooling into the space above the horizontal partition plate 25 by a duct (not shown) or the like, thereby distributing the cooling air to the entire lower surface of the heating coils 6RC and 6LC. The An arrow indicated by a solid line in FIG. 48 indicates the flow of such cooling air. VX1 is a vertical line passing through the center point X1 of the heating coil 6LC, and VX2 is a vertical line passing through the center point X2 of the heating coil 6RC.

  Since the space 271 between the main heating coil MC and the sub heating coil SC1 and the space 271 between the main heating coil MC and the sub heating coil SC4 are located on the center line CL1 side with respect to the left wall 10L and the right wall 10R of the main body case 2. Since the cooling air passes from the bottom to the top, the cooling effect can be effectively obtained over the entire heating coils 6RC and 6LC. Note that the facing distance between the upper surfaces of the heating coils 6RC and 6LC and the lower surface of the top plate 21 is about several mm. If this interval is too large, the induction heating efficiency is lowered.

  In FIG. 48, HK is a height dimension from the installation surface of the kitchen furniture KT to the upper surface of the top plate 21. The height dimension HK should be small so that there is no sense of incongruity with other furniture or sinks placed adjacent to the induction heating cooker, and there is no obstacle to smooth horizontal movement of the pan etc. As described above, the height dimension HK is actually required to be several centimeters in relation to the installation of at least two flat heating coils 6RC and 6LC and the coil support 290. Note that the main heating coil MC and the sub-heating coils SC1 to SC4 themselves constituting the heating coils 6RC and 6LC are formed with a thickness of only a few millimeters to 10 mm.

  Since it is configured as described above, regardless of whether the right heating coil 6RC or the left heating coil 6LC is driven, the position of the display screen 100 is between the center points X1 and X2 and between the sub heating coils SC1 to SC4. Since it is on the extended line of the straight line passing through the space 273 (solid arrow ZT shown in FIG. 47), it is not easily affected by the magnetic field leaking between the sub-heating coils SC1 to SC4 as described in the first embodiment. .

  The maximum outer dimensions of the two heating coils 6LC and 6RC are as large as 300 mm, respectively, but in the fourth embodiment, the horizontal dimension of the component storage chamber 10 is about 800 mm, and the distance between the two heating coils 6LC and 6RC is also as follows. Because there is 450 mm, even if a pan with a pan bottom diameter of about 320 mm and a body diameter of about 340 mm is placed above the right heating coil 6RC, the two pans do not come into contact with each other or interfere with each other. At the same time induction heating is possible. That is, according to the fourth embodiment, even if the width dimension of the installation opening XX of the kitchen furniture KT is the same size as before, for example, a restriction of 560 mm or less, the parts storage chamber 10 can be formed widely. Accordingly, since the flat area of the top plate 21 can be increased, a large round pan, a rectangular iron plate for cooking pottery, or the like can be used, and convenience is further improved.

  Further, as in the fourth embodiment, if the space dimension of the component storage chamber 10 is sufficiently secured and the cooling air is caused to flow around the heating coils 6LC and 6RC, the maximum temperature of the heating coils 6LC and 6RC may be lowered. it can. This eliminates the need for an air path design that increases the cooling air volume from the blower fan in consideration of the maximum temperature, reduces the air volume for cooling the heating coil, and reduces the rotation speed of the blower fan. As a result, there is an effect that noise reduction can be expected.

  In the second embodiment, seven cooking menu keys such as a selection key E1A for high-speed heating, a selection key E1B for boiling water, a selection key E1C for boiling, a selection key E2A for preheating, and a rice selection key E2B are provided. Even when these cooking menu keys are selected, it is assumed that the convection promotion control is not always automatically performed at an appropriate timing. Therefore, it is preferable to prepare a cooking recipe selection key that requires convection promotion control and have the user select the key. For example, the curry key as one of the cooking recipes was not convection due to the thick liquid, and it was easy to burn at the bottom of the pan. The curry roux has been cooked in the past, either by adding the vegetables after they have been fully boiled, and by stopping induction heating after the curry is added or by driving the induction heating coil with minimum heat to boil.

  Therefore, if the user operates the selection key “CURRY” before the start of cooking, immediately after the start or in the middle of cooking, the user may be informed to perform the convection promotion control of the present invention when inserting the curry roux. desirable. Specifically, as shown in the second embodiment, a display that prompts the user to press the convection promotion control selection switch 350 using the guide area 100GD of the display screen 100 that informs the user of reference information in various cooking as needed. Or an announcement by the speech synthesizer 315 can be considered. If the convection promotion control selection switch 350 is selected, the energization control circuit 200 automatically changes the energization conditions for the sub-heating coil SC and the main heating coil MC, and whether or not the timing is appropriate after boiling. This determination is automatically performed by the energization control circuit 200, and when it is at an appropriate timing, heating for promoting convection is continued.

  In the heating cooker described in the first embodiment, the rated minimum thermal powers of the first induction heating unit 6L and the second induction heating unit 6R are both 150 W, but there are a plurality of induction heating units in this way. In some cases, having the minimum heating power is beneficial in improving the usability of the cooker. For example, when both the first induction heating unit 6L and the second induction heating unit 6R have a rated maximum heating power of 3000 W as in the first embodiment, boiling water can be quickly heated until boiled food is boiled. There is a merit that it can be done in a short time, but if there are ingredients such as vegetables and meat in the cooking liquid and it becomes delicious cooking when slowly cooked, it lowers the heating power and heats for a long time, In such a case, if the pan is left in the heating unit as it is, the next cooking is required to be moved to the next induction heating unit. In this case, if the heating level changes in the heated part that has moved, the expected cooking may not be possible, so if the heating power can be set in a plurality of levels as in the first embodiment, the level of the heating power If the two heating sources are made the same, and more preferably the minimum heating power is made equal, there is a merit that the user does not have trouble setting the heating power after moving the pan.

  In the third embodiment, the main heating coil MC is constituted by the annular inner heating coil 6LC1 and the annular outer heating coil 6LC2, but this structure is applied to the second induction heating unit 6R. Also good. In this case, the heating coil 6RC of the second induction heating unit 6R is composed of two parts: an annular inner heating coil 6RC1 and an annular outer heating coil 6RC2 wound around the outside, A high frequency current is supplied to the inner heating coil 6RC1 and the outer heating coil 6RC2 from inverter circuits (not shown) independent from each other, and the frequency of the high frequency current supplied to the inner heating coil 6RC1 and the outer heating coil 6RC2. Should be aligned.

  In the induction heating cooker according to the present invention, an induction heating unit having a main heating coil and a sub heating coil and a display screen such as a liquid crystal screen capable of displaying cooking conditions and operation status are arranged side by side in a space below the top rate. It can be widely used in cooking equipment.

  A body part, B top plate part, C casing part, D heating means, E operation means, F control means, G display means, W1 width dimension of main body part A, W2 width dimension of top plate, W3 of component storage chamber Horizontal dimension, AM active mark, BL Straight line connecting the centers of the first and second induction heating parts, CL, CL1 Left and right center line of the main body part A, CL2 Left and right center line of the first induction heating part, CL3 Second induction heating Left and right center lines, CL4 front and rear center lines of the first induction heating unit, CU cooling unit, DA left side heating coil outer diameter size, DB sub heating coil outer diameter size, DBL outside the heating coil of the first induction heating unit Diameter, DBR heating coil outer diameter of the second induction heating unit, maximum outer diameter dimension of the DC wide area display body, DF outer diameter of the inner heating coil of the second induction heating unit, DG outer heating of the second induction heating unit The outer diameter of the coil, R1 diameter of the heating coil, DR2 bottom diameter of the metal pan, DR3 body diameter of the metal pan, FL straight line connecting the first induction heating unit and the foremost end of the second induction heating unit, R1 first induction heating unit The radius of the main heating coil of R2, the radius of the heating coil of the R2 second induction heating unit, the radius of the entire heating coil of the R3 first induction heating unit, the selection key for E1A high-speed heating, the selection key for E1B hot water heating, E1C Selection key, E2A preheating selection key, E2B rice cooking selection key, E3A deep-fried food selection key, E3B boiling water + heat retention selection key, FH1 body case left flange part overhang dimension, FH2 body case right flange part overhang dimension, KA arrangement angle , KB arrangement angle, KC, arrangement angle, KC1 arrangement angle, KC2 arrangement angle, KT kitchen furniture, K1 installation port, KTK opening, N Object (pan), SC side (sub) heating coil (group), SC1 to SC4 side (sub) heating coil, MC main heating coil, inverter circuit for MIV main heating coil, SIV1 to SIV4 side (sub) heating Inverter circuit for coil, SX space, STC Central light emitting part (main heating coil light emitting part), W5 Spacing distance between heating coils of the first and second induction heating parts, W7 to W10 Spatial distance from heating coil to parts storage room wall surface , W12 The spacing between the heating coil of the first induction heating unit and the heating coil of the second induction heating unit, X1 center point, X2 center point, 2 body case, 2A body, 2B front flange plate, 2S inclination Part, 2U trunk rear wall, 3B rear flange, 3L left flange, 3R right flange, 6L first induction heating unit, 6LC heating coil of first induction heating unit, 6 M guide mark, 6M third induction heating unit, 6R second induction heating unit, heating coil for 6RC second induction heating unit, 6RC1 inner annular coil, 6RC2 outer annular coil, 6RM guidance mark, 7 radiation type central electric Heating source (heater), 7M guide mark, 8L left cooling chamber, 8R right cooling chamber, 9 grill heating chamber, 9A front opening, 9B rear opening, 9C inner frame, 9D outer frame, 9E exhaust port, 10 upper parts chamber ( Storage space, parts storage chamber), 12 rear exhaust chamber, 13 door, 13A central opening, 13B handle, 14 exhaust duct, 14A upper end opening, 14B cylindrical bottom, 14C vent hole, 20 upper frame (frame body), 20B Right vent, 20C Central vent, 20D Left vent, 21 Top plate, 22 Radiant electric heating source (heater), 23 Radiant electric heater Source (heater), 24A Notch, 24L Left upper / lower partition, 24R Right upper / lower partition, 25 Horizontal partition, 26 Air gap, 28 Rear partition, 28A Exhaust, 30 Blower, 30F Wing, 31R Infrared Sensor, 31L, 31L1-31L5 Infrared sensor, 32 rotary shaft, 33 motor drive circuit, 34 parts case, 34A first exhaust port, 34B second exhaust port, 37 fan case, 37A suction cylinder, 37B suction port, 37C Exhaust port (exit), 37D case, 37E case, 39 air blowing chamber, 41 circuit board, 42 cooling duct, 42A upper case, 42B lower case, 42C ejection hole, 42D partition wall, 42E partition wall, 42F ventilation space, 42G ventilation Space, 42H Ventilation space, 42J Communication port (hole), 42 Ventilation hole, 43A Radiation fin, 43B Radiation fin, 45R LCD display screen, 45L LCD display screen, 46 Front part case, 46A Lower duct, 46B Upper duct, 46C Notch, 50 Container cover, 56 Mounting board, 57 Electricity Electronic components, 60 front operation unit, 61 top operation unit, 62L left front operation frame, 62R right front operation frame, 63 main power switch, 63A operation button, 64R right operation dial, 64L left operation dial, 66R right indicator, 66L Left indicator lamp, 70 Right operation part, 71 Left operation part, 72 Central operation part, 73 Magnetic flux leakage prevention material, 75 AC power supply, 76 Rectifier circuit, 77A switching element, 77B switching element, 78A switching element, 78B switching element, 79A switching element, 79B switching Switching element, 80 DC power supply section, 81A switching element, 82B switching element, 86 smoothing capacitor, 88A switching element, 89A switching element, 90 one-touch setting key section, 91 low heat power key, 92 medium heat power key, 93 high heat power key , 94 3KW key, 95 Radiation type electric heating source 22, 23 operation button, 96 Stop operation switch operation button, 97A Temperature control switch operation button, 97B Temperature control switch operation button, 98 Power on / off switch Button, 99A setting switch, 99B setting switch, 100 integrated display means, 100AT display character, 100H thermal power display character, 100L1 corresponding area of the first induction heating source section 6L, 100L2 corresponding area of the first induction heating section 6L, 100M1 Third invitation Corresponding area of the heating unit 6M, 100M2 Corresponding area of the third induction heating unit 6M, 100R1 Corresponding area of the second induction heating unit 6R, 100R2 Corresponding area of the second induction heating unit 6R, cooking of the 100G grill heating chamber 9 Area, 100GD guide area, 100F key display area, 100N optional display area, 100LX display unit, 100P display character, 100X thermal power display character, 101R right thermal power display unit, 101L left thermal power display unit, 102B switching element, 103B switching element, 104B switching element, 105B switching element, 106 blower, 106A rotary blade, 106B drive motor, 108 saucer, 109 grill, 110A resonance capacitor, 110B resonance capacitor, 113 gap, 114 gap, 115 Gap, 116 Gap, 121 Deodorizing catalyst, 121H Electric heater for catalyst, 124 Shared display, 125 Left operation unit display, 126L Middle heating coil left operation unit display, 126R Middle heating coil right Display for operation unit, 130 convenient menu key, 131R right IH convenient menu button, 132 cover, 133 partition, 134 cooling space, 135 vent, 141 input key, 142 input key, 143 input key, 144 input key, 145 input key, 146 input key, 200 energization control circuit, 201 input unit, 202 output unit, 203 storage unit, 204 arithmetic control unit (CPU), 210R inverter circuit of right IH heating source, inverter circuit of 210L left IH heating source 210M Inverter circuit of central induction heating source 6M, DESCRIPTION OF SYMBOLS 12 Heater drive circuit of grill heating chamber 9, 213 Heater drive circuit of grill heating chamber 9, 214 Heater drive circuit for driving catalyst heater 121H, 215 Display unit drive circuit of integrated display means 100, 215A Display memory, 215B Display controller 215B, 215C interface, 215D power supply, 215E common driver, 215F segment driver, 221 rectifier bridge circuit, 222 coil, 223 smoothing capacitor, 224 resonance capacitor, 225 switching means (IGBT), 226 flywheel diode, 227 current detection sensor, 228 drive circuit, 228A drive circuit, 228B drive circuit, 231 drive circuit, 240 temperature detection circuit, 241 temperature detection element (temperature sensor), 2 2 Temperature detection element (internal temperature sensor), 243 Temperature detection element (temperature sensor), 244 Temperature detection element (temperature sensor), 245 Temperature detection element (temperature sensor), 250 Pan dedicated key, 251 Combined cooking key, 260- 264 drive circuit, 267A current sensor, 267B current sensor, 267C current sensor, 267D current sensor, 270-275 space, 276 individual light emitting unit, 277 wide area light emitting unit, 278 drive circuit, 280 heated object placement determining unit, 290 coil Support, 290A Supporting projection, 291 Magnetic shield ring, 300 Drive motor, 307 Air gap, 311 Main heating coil graphic, 312 Sub heating coil graphic, 313L Left display unit, 313M Central display unit, 313R Right display unit, 314 Display window 315 Speech synthesizer, 3 6 speakers, 400 space, 401L exhaust port, 401R exhaust port.

Claims (18)

A body whose top surface is covered with a top plate;
An induction heating unit and a display unit arranged in a component chamber inside the main body;
An inverter circuit for supplying a high-frequency current to the induction heating unit;
The inverter circuit and an energization control unit that controls the display unit,
The induction heating unit includes an annular main heating coil in the center, and a plurality of side heating coils arranged close to the periphery and maintaining a predetermined space with each other,
The energization control unit drives the inverter circuit to enable independent heating of the main heating coil and cooperative heating of the main heating coil and the side heating coil, respectively.
Place the display screen of the display unit in the direction opposite to the main heating coil across the space between the side heating coils ,
The energization control unit supplies high-frequency current in the same direction in adjacent regions of the two side heating coils when simultaneously supplying high-frequency current from the inverter circuit to two adjacent side heating coils. Induction heating cooker. A display unit driving circuit for driving the display unit;
The induction heating according to claim 1, wherein the display unit driving circuit includes a display memory for storing information to be displayed on the display screen, and a display controller for reading out necessary information from the memory. Cooking device. The induction heating cooker according to claim 1 , wherein the side heating coil is entirely curved along an outer periphery of the main heating coil. Two or more sets of the side heating coils are provided around the main heating coil as two sets at regular intervals.
The inverter circuit is provided for each side heating coil set or each side heating coil,
The induction heating cooker according to claim 1 , wherein the energization control unit can be driven by heating independently for each set of the side heating coils or for each side heating coil. The induction heating cooker according to claim 1 , wherein the side heating coil has a ventilation space for heat dissipation inside. The side heating coil comprises four heating coils, a first, a second, a third, and a fourth, arranged concentrically around the main heating coil,
The first side heating coil is disposed on the front side of the main heating coil, and between the right side end of the first side heating coil and the left side end of the third side heating coil adjacent to the first side heating coil. The first display screen of the display unit is arranged in a direction opposite to the main heating coil across the space formed in
In a direction opposite to the main heating coil across the space formed between the left end of the first side heating coil and the right end of the adjacent second side heating coil, The induction heating cooker according to claim 1 , further comprising a second display screen of the display unit. A body whose top surface is covered with a top plate;
A first induction heating unit and a second induction heating unit which are arranged in a component chamber inside the main body and are separated from each other to the left and right;
Located in front of the straight line connecting the center points of the first induction heating unit and the second induction heating unit and between straight lines in the front-rear direction passing through the center points, and accommodated in the component chamber Display screen of the displayed display section,
An inverter circuit for supplying a high-frequency current to the first and second induction heating units;
The inverter circuit and an energization control unit that controls the display unit,
The first induction heating unit includes a ring-shaped main heating coil in the center and a plurality of side heating coils arranged close to the periphery and maintaining a predetermined space.
The second induction heating unit includes an annular heating coil,
The energization control unit drives the inverter circuit to enable independent heating of the main heating coil and cooperative heating of the main heating coil and the side heating coil, respectively.
Place the display screen of the display unit in the direction opposite to the main heating coil across the space between the side heating coils ,
The energization control unit supplies high-frequency current in the same direction in adjacent regions of the two side heating coils when simultaneously supplying high-frequency current from the inverter circuit to two adjacent side heating coils. Induction heating cooker. A display unit driving circuit for driving the display unit;
The induction heating according to claim 7 , wherein the display unit driving circuit includes a display memory for storing information to be displayed on the display screen, and a display controller for reading out necessary information from the memory. Cooking device. In the display screen of the display unit, the rear part penetrates to a position behind the straight line connecting the first induction heating unit and the foremost end of the second induction heating unit, and the first induction heating is performed. parts and the induction heating cooker according to claim 7, characterized in that the display information related to setting of the heating conditions according to the second induction heating section. The induction heating cooker according to claim 7 , wherein the display screen of the display unit displays operating conditions of both the first induction heating unit and the second induction heating unit. Two or more sets of the side heating coils are provided around the main heating coil as two sets at regular intervals.
The inverter circuit of the first induction heating unit is provided for each side heating coil set or each side heating coil,
The induction heating cooker according to claim 7 , wherein the energization control unit can be driven to heat independently for each set of the side heating coils or for each side heating coil. The main heating coil includes an annular inner heating coil and an annular outer heating coil wound around the outside.
Comprising an inverter circuit for supplying a high-frequency current to each of the inner heating coil and the outer heating coil,
The induction heating cooker according to claim 7 , wherein the energization control unit controls a magnitude of a high-frequency current for the inner heating coil and the outer heating coil. The heating coil of the second induction heating unit includes an annular inner heating coil,
An annular outer heating coil wound around the outside,
Comprising an inverter circuit for supplying a high-frequency current to each of the inner heating coil and the outer heating coil,
The induction heating cooker according to claim 7 , wherein the energization control unit controls a magnitude of a high-frequency current for the inner heating coil and the outer heating coil. A coil support made of a heat-resistant material that integrally supports the main heating coil and the side heating coil and has a large number of air holes; and a magnetic-shielding ring that is attached to the outermost periphery of the support. The induction heating cooker according to claim 7 , wherein The outer diameter size of the heating coil of the second induction heating unit is smaller than the maximum diameter of the heating coil of the first induction heating unit and larger than the outer diameter size of the main heating coil. Item 8. The induction heating cooker according to Item 7 . The minimum distance between the side heating coil of the first induction heating unit and one side wall surface of the component storage chamber, and the minimum distance between the heating coil of the second induction heating unit and the other side wall surface of the component storage chamber claim 7, characterized in that the, compared to both, was towards the larger mutual distance between the first and side heating coil of the induction heating unit and the second heating coil of the induction heating portion of The induction heating cooker described in 1. The side heating coil comprises four heating coils, a first, a second, a third, and a fourth, arranged concentrically around the main heating coil,
The first side heating coil is disposed on the front side of the main heating coil, and between the right side end of the first side heating coil and the left side end of the third side heating coil adjacent to the first side heating coil. The first display screen is arranged in a direction opposite to the main heating coil across the space formed in
In the direction opposite to the main heating coil, the space formed between the left end of the first side heating coil and the right end of the second side heating coil adjacent to the first side heating coil The induction heating cooker according to claim 7 , further comprising a second display screen of the display unit. Either one of the first display screen and the second display screen displays a cooking menu, and the other displays the elapsed time from the start of heating, the remaining time of the set heating time, and the completion of preheating. The induction heating cooker according to claim 17 , wherein at least one of the required time or information on thermal power is displayed.

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