JP2006003047A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooker displaying the progress situation of cooking selected and executed by a user so that the progress situation can be understood more easily. <P>SOLUTION: A fluorescent display tube 23 for displaying a cooking setting state and the progress situation of the set cooking at an operation section 6 is arranged at the lower surface side of a top plate 15. A control circuit 78 has an automatic cooking function for automatically controlling the heating output of heating coils 12, 13, based on the output signal of temperature detection sections 40-42, can set a plurality of cooking modes including the automatic cooking function by the operation section 6, and can display a selected cooking mode and the cooking progress situation of the cooking mode integrally. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heating cooker that heats a cooked appliance placed on a heating portion of a top plate by a heating means.

For example, Patent Document 1 discloses an induction heating cooker that displays a result selected by a user from a plurality of cooking modes, and that always displays a cooking mode other than the selected cooking mode. .
Patent Document 2 discloses the following cooking device. When the cooking mode selected by the user is the tempura mode, the temperature of the pan is detected when heating is started, and the detected temperature is controlled to reach the temperature set by the user (that is, the heating temperature of the oil). And if a user's preset temperature is 160 degree | times, 180 degree | times, 200 degree | times etc., LED corresponding to each temperature will be made to light.
Japanese Utility Model Publication No. 63-87796 Japanese Patent Laid-Open No. 11-2412

In the technique disclosed in Patent Document 1, the user cannot know how the selected cooking mode is proceeding. Moreover, since cooking modes other than the selected cooking mode are always visually recognized by the user, there is a possibility of erroneous recognition, and there is a problem that the design is deteriorated.
In addition, in the technique disclosed in Patent Document 2, it can be seen that the temperature of the pan has reached the set temperature by referring to the LED display, but at what timing it has reached, the heating starts. From this point on, it is impossible to know unless the LED is continuously watched. However, for example, it is conceivable to display the temperature increasing process by blinking an LED indicating the set temperature and changing the blinking cycle. Specifically, when the temperature of the pan is lower than the set temperature, the flashing cycle is lengthened, the flashing cycle is shortened as the temperature approaches the set temperature, and the LED is continuously turned on when the set temperature is reached. .

However, it is not easy to grasp the progress of cooking by such blinking display of LEDs. In addition, the selection result of the cooking mode and the progress of the cooking mode are displayed by LEDs located at distant positions, and the display form has to be difficult for the user to recognize.
In addition, there is a type in which cooking time is set by a timer in advance and the remaining cooking time is displayed by a counter. However, the above time does not reflect the actual progress of cooking, and is only a reference level.

  This invention is made | formed in view of the said situation, The objective is to provide the cooking device which can display the progress of the heating cooking which the user has selected and performed more easily. is there.

In order to achieve the above object, the heating cooker of the present invention constitutes the upper surface of the cooker body, and the top plate on which the cooked utensil is placed on the heating unit;
Heating means for heating the cooking utensil placed on the heating unit;
A temperature detection sensor disposed on the lower surface side of the heating unit;
Operation means for performing a setting operation related to the control of the induction heating;
Heating control means for controlling the heating means based on the setting operation;
Display means for displaying the cooking setting state in the operation means and the progress status of the set cooking,
The heating control means has an automatic cooking function for automatically controlling the heating output of the heating means based on the output signal of the temperature sensor,
The operation means can set a plurality of cooking modes including the automatic cooking function,
The display means is arranged on the lower surface side of the top plate, and is configured to be able to integrally display the selected cooking mode and the cooking progress of the cooking mode.

  If comprised in this way, since the selected cooking mode and the progress condition of the cooking mode are integrally displayed by the display means arrange | positioned at the lower surface side of a top plate, the user is performing It becomes easy to intuitively recognize the progress of cooking.

  According to the present invention, the user can easily recognize the progress of the cooking being performed. Therefore, for example, even when the user performs other work in parallel with cooking by the heating cooker, cooking can be reliably performed without failure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 8 shows an external perspective view of the kitchen cabinet 1 with the heating cooker 2 incorporated therein. FIG. 9 is a plan view of the main part shown with the top plate removed. A main body 3 of the heating cooker 2 is stored in a storage unit 4 provided in the cabinet 1. A roaster portion 5 is provided on the left portion of the main body 3, and an operation portion 6 is provided on the right portion. The operation section (operation means) 6 is provided with a plurality of switches 7.

  An upper heating unit 10 as shown in FIG. 9 is provided on the upper portion of the main body 3. The upper heating unit 10 has a left heating coil 12 and a right heating coil 13 for induction heating arranged in the left and right sides in a rectangular box-shaped upper case 11 whose upper surface is open, and is positioned on the rear side of the central portion. For example, a central heater 14 made of a radiant heater is arranged, and a top plate 15 made of heat-resistant glass is provided on the upper surface opening so as to cover the coils 12 and 13 and the heater 14 from above.

  On the top plate 15, circular heating units 16, 17 and 18 are respectively displayed above the left and right heating coils 12 and 13 and the central heater 14. The left and right heating coils 12 and 13 are induction-heated based on being energized and controlled while the cooking container P is placed on the heating units 16 and 17, and the central heater 14 is The cooking container P is heated based on being energized and controlled while the cooking container P is placed on the heating unit 18.

  In the front part of the upper case 11, thermal power display units 20 and 21 each having a large number of LEDs (light emitting diodes) 19 are provided in front of the left and right heating coils 12 and 13, respectively, Located between the coils 12 and 13, a high-temperature caution display unit 22 having an LED 19 and a fluorescent display tube (display unit) 23 which is one of the display units are provided. Therefore, the thermal power display units 20 and 21, the high temperature display unit 22, and the fluorescent display tube 23 are disposed below the top plate 15. Each thermal power display part 20 and 21 is arrange | positioned so that the outer periphery of the corresponding heating part 16 and 17 may be followed substantially. In this case, the top plate 15 has a translucent structure by sputtering a thin film of metal such as titanium on the back surface (lower surface) of a substantially transparent crystallized glass, and has a spectral transmission characteristic in the visible light region. is doing.

  FIG. 1 shows a specific display example of the fluorescent display tube 23. FIG. 1 shows a state where all the display parts are lit. The display contents of the fluorescent display tube 23 include a use state display unit 24 (L, R, M) indicating the use state of the left and right heating coils 12 and 13 and the central heater 14, a hot water display unit 25, a fried food display unit 26, The tempura display unit 27, the rice cooking display unit 28, the roaster display unit 29, and the thermal power display unit 30 (shared with the roaster and the central heater) are provided. In this case, red and blue are used as display colors of the display units 24 to 30.

  In addition, when displaying using the fluorescent display tube 23 in the heating cooker 2, there are the following merits. That is, since the anode of the fluorescent display tube 23 emits light, the viewing angle is wider and the brightness is higher than that of the liquid crystal display. Therefore, even while cooking or looking at the operation unit 6 (from the viewpoint of the user) Display visibility is good). Further, since the top plate 15 is made translucent, only the display portion where the fluorescent display tube 23 is lit can be visually recognized by the user. Therefore, it is excellent in design and display contents are easy to understand.

  Further, the fluorescent display tube 23 can emit a color (purple: 400 nm to red: 700 nm) corresponding to substantially the entire visible light band according to the phosphor material constituting the anode. Therefore, by giving the top plate 15 a spectral transmission characteristic that is translucent in the visible light region, it is possible to perform display in multiple colors. In addition, the fluorescent display tube 23 has several times better blue and green luminance than the red one due to the luminous efficiency of the phosphor. Therefore, if the top plate 15 is set so that the spectral transmittance of about 700 nm corresponding to red is larger than the spectral transmittance of about 500 nm corresponding to blue and green, the luminance of each color can be made substantially uniform. .

In addition, a control circuit 78 including a microcomputer is provided inside the operation unit 6 (see FIG. 12). This control circuit 78 is based on the operation signal of the switch 7 of the operation part 6, the detection signal of the said temperature sensor, and the control program prepared previously, the said left and right heating coils 12, 13, the central heater 14, and the roaster 5 and the like, and also has a function of controlling the thermal power display units 20 and 21, the high temperature caution display unit 22, and the fluorescent display tube 23.
In the above configuration, the thermal power display units 20 and 21 display the degree of thermal power of the corresponding heating coils 12 and 13 according to the number of the LEDs 19 that are turned on. The high temperature caution display unit 22 is turned on when the temperature detected by the temperature sensor is higher than the set temperature.

  FIG. 10 is a longitudinal front view in the vicinity of the top plate 15. On the lower surface side of the heating units 16 and 17, temperature detection units 40 </ b> L and 40 </ b> R are arranged at the center of the heating coils 12 and 13. Further, the heating coils 12 and 13 are arranged in a state of being placed on the support bases 33 and 34, and a ferrite (high magnetic permeability) formed in a rod shape is provided below the support bases 33 and 34. A plurality of bodies) 35 and 36 are arranged radially.

The fluorescent display tube 23 positioned between the left and right heating coils 12 and 13 is supported so as to be sandwiched from the left and right by left and right support members 38 and 39 that are erected and fixed to the printed circuit board 37. ing. The lead pins 23a, the grid 23c, the sealing lid (not shown), etc. that constitute the fluorescent display tube 23 are made of a magnetic metal material such as iron, nickel, and chrome alloy. In the vertical direction, the magnetic metal material is arranged such that the upper end position is located below the upper surfaces of the ferrites 35 and 36. Reference numeral 23 d denotes a display surface glass of the fluorescent display tube 23.
The induction heating coils 12 and 13 are composed of two large and small unit coils 12 (B, S) and 13 (B, S) arranged concentrically. The large-diameter unit coils (hereinafter referred to as large coils) 12B and 13B are spaced apart from the small-diameter unit coils (hereinafter referred to as small coils) 12S and 13S.

FIG. 11 is a longitudinal sectional side view in the depth direction near the top plate 15. Three temperature detectors 40 to 42 are disposed on the lower surface of the top plate 15 above the induction heating coils 12 and 13, respectively. One temperature detection unit 40 of the temperature detection units 40 to 42 is located at the center of the small coils 12S and 13S, and the remaining two temperature detection units 41 and 42 are connected to the center of the small coils 12S and 13S. It is on a straight line extending in the front-rear direction and is located between the large coils 12B and 13B and the small coils 12S and 13S.
Each of the temperature detection units 40 to 42 is configured by accommodating a temperature detection element (for example, a thermistor) in a ceramic case whose main component is aluminum nitride, for example, and the surface of the case is the top plate 15. It arrange | positions so that it may contact | adhere to the back surface.

  FIG. 12 shows the overall electrical configuration. In FIG. 12, the DC power supply circuit 45 includes a rectifying stack 47 for full-wave rectifying the output of the AC power supply 46 and a smoothing capacitor 48 for smoothing the rectified output. The half bridge type inverter circuit 49 fed from the DC power supply circuit 45 constitutes the heating means in the present invention together with the heating coil 12 (or 13).

  The inverter circuit 49 is connected to the series circuit of the IGBTs 50 and 51 and the series circuit of the resonance capacitors 52 and 53 in parallel with the smoothing capacitor 48, respectively, and the common connection point of the IGBTs 50 and 51 and the common connection of the capacitors 52 and 53. The heating coil 12 is connected so as to form a series resonant circuit between the points. In addition, a flywheel diode (no symbol) is connected between each collector and emitter of the IGBTs 50 and 51, respectively.

  The inverter voltage phase detection circuit 54 detects the inverter voltage Viv output from the output terminal of the inverter circuit 49 (common connection point of the IGBTs 50 and 51), and outputs the detected inverter voltage Viv to the phase comparison circuit 55. The capacitor voltage phase detection circuit 56 detects the voltage at the common connection point of the capacitors 52 and 53, that is, the capacitor voltage Vc that correlates in phase with the inverter current flowing through the capacitors 52 and 53, and uses the detected voltage Vc. Output to the phase comparison circuit 55.

  The phase comparison circuit 55 outputs a phase difference signal Vp1 indicating the phase difference of each input signal by comparing the phases of the inverter voltage Viv and the capacitor voltage Vc. The phase difference signal Vp1 is sent to the difference comparison circuit 57. Given. The phase difference setting circuit 58 is configured to output a variably set phase difference setting voltage Vset as an input power adjustment signal for determining input power, and the phase difference setting voltage Vset is supplied to the difference comparison circuit 57. Given.

  The difference comparison circuit 57 compares the phase difference signal Vp1 output from the phase comparison circuit 55 with the phase difference setting voltage Vset variably set in the phase difference setting circuit 58, and the comparison result is a binary signal. Vp2 is output to a voltage controlled oscillator (hereinafter referred to as VCO) 59. That is, the difference comparison circuit 57 increases Vp2 if Vp1> Vset, and decreases Vp2 if Vp1 ≦ Vset.

The VCO 59 is frequency control means for controlling the oscillation frequency of the inverter circuit 49 so that the phase difference between the inverter voltage Viv and the capacitor voltage Vc becomes a phase difference variably set by the phase difference setting circuit 58. The oscillation frequency is changed according to the output signal from the circuit 57.
Note that the VCO as a general analog circuit has an oscillation frequency that changes according to the input voltage. The VCO 59 here is a circuit that digitally simulates the circuit operation. The oscillation frequency is changed according to the comparison result given.

  The drive circuit 60 alternately turns on and off the IGBTs 50 and 51 based on the signal from the VCO 59. When the IGBTs 50 and 51 are alternately turned on and off in this manner, the heating coil 2 and one of the capacitors 52 and 53 alternately exhibit a series resonance state, whereby the heating coil 12 generates high-frequency power and the top plate The cooking container P placed on 15 is induction-heated.

  The initial circuit 61 is a means for initially setting the phase difference between the inverter voltage Viv phase-correlated with the output voltage of the inverter circuit 49 and the capacitor voltage Vc phase-correlated with the output current of the inverter circuit 49, When the power is turned on, an initial signal is given to the phase difference setting circuit 58. In this case, when the initial signal is given, the phase difference setting circuit 58 outputs a phase difference setting voltage Vset such that the phase difference between the inverter voltage Viv and the capacitor voltage Vc becomes a reference phase difference. Thereby, the input power is set to be a predetermined initial setting power (for example, about 100 W when the cooking container P placed on the top plate 15 is an iron pan).

  The current transformer CT (1) is provided in a state in which a current path between the AC power supply 46 and the DC power supply circuit 45 is a primary conductor in order to detect an input current Iin from the AC power supply 46. The input current detection circuit 62 outputs a current detection signal having a voltage level corresponding to the input current Iin based on the secondary side output of the current transformer CT (1). The current detection signal is used as a load state detection circuit. 63 and also supplied to the electric energy detector 67 via the A / D converter 66b.

  The load state detection circuit 63 detects whether or not the object to be heated (the cooking container P) placed on the top plate 15 is an appropriate load based on the current detection signal from the input current detection circuit 62. That is, the load state detection circuit 63 sets threshold values Is1 and Is2 (Is1 <Is2) having a predetermined width for determining the load state, and these threshold values Is1 and Is2 and the input current are set. The value of the input current Iin detected by the detection circuit 22 is compared.

  Specifically, when the value of the input current Iin is lower than the threshold value Is1, the load state detection circuit 63 is prepared by cooking the object to be heated placed on the top plate 15 from iron or nonmagnetic stainless steel. It is determined that it is a container P. Further, when the value of the input current Iin is between the threshold value Is1 and the threshold value Is2, it is determined that the object to be heated placed on the top plate 15 is the cooking container P made of aluminum. Further, when the value of the input current Iin is larger than the threshold value Is2, it is determined that there is no load, and a detection signal is output.

The timer circuit 64 is set to a predetermined timer time, for example, 3 seconds. When the detection signal from the load state detection circuit 63 is input, the timer circuit 64 executes the load detection operation again by operating the initial circuit 61 after 3 seconds. .
On the other hand, a current transformer CT (2) is provided between the common connection point of the IGBTs 50 and 51 (the output terminal of the inverter circuit 49) and the heating coil 2 with the current path between them as a primary conductor. The inverter current detection circuit 65 outputs a current detection signal having a voltage level corresponding to the inverter current based on the secondary side output of the current transformer CT (2). The current detection signal is converted into an A / D converter 66b. The maximum value of the inverter current is limited by applying the phase difference setting circuit 58 after converting the signal into a digital value signal. The power supply voltage detection circuit 68 detects the voltage of the AC power supply 46, converts the power supply voltage detection signal into a digital value signal by the A / D conversion unit 66b, and then supplies the signal to the power amount detection unit 67.

  The power amount detection unit 67 integrates the input power by temporally integrating the input current, and gives the integrated power value to the heated object detection unit 69. The power amount detection unit 67 is configured to calculate input power on the assumption that the power supply voltage is constant. When the power supply voltage fluctuates, a power supply voltage signal given from the power supply voltage detection circuit 68 is used. In consideration of the above, the input power is calculated.

  The voltage signal generation circuit 70 converts a resistance value change of the temperature detection element included in the temperature detection units 40 to 42 (only the temperature detection unit 40 is shown in FIG. 12) into a voltage signal having a level corresponding to the detected temperature and outputs the voltage signal. The voltage signal is converted into a digital value signal by the A / D conversion unit 71 and supplied to the heated object temperature determination unit 72. Actually, the voltage signal generation circuit 70 multiplexes and receives the detection signals output from the three temperature detection units 40 to 42, respectively. The heated object temperature determination unit 72 generates a temperature signal indicating the actual detected temperature (temperature of the heated object) by the temperature detection element based on the voltage signal from the A / D conversion unit 71, and the temperature A signal is given to the to-be-heated object detection part 69 and the thermal power setting part 73 mentioned later.

In the heated object determination reference storage unit 74, the correlation between the integrated power value by the electric energy detection unit 67 and the detected temperature by the temperature detection element 42 (the output of the heated object temperature determination unit 72) is information about the heated object. Is stored as determination reference value information to be described later, and the determination reference value information is provided to the heated object detection unit 69.
The heated object detection unit 69 uses the determination reference value information stored in the heated object determination reference storage unit 74, the integrated power value from the power amount detection unit 67, and the temperature signal from the heated object temperature determination unit 72. Based on the comparison result, information about the object to be heated (type of cooking operation (eg, cooking in a pot whose heating object is water, cooking of a fried food whose heating object is oil), the type and weight of the cooking container P, cooking For obtaining and outputting the warp of the bottom of the container P, the amount of cooked food, etc.).

  The operation unit 6 is provided to perform operations such as setting cooking conditions such as heating output (input power) and cooking time, setting a cooking mode that can be selected from a plurality of types, and starting and stopping cooking. In addition to such operation functions, the set heating output, cooking time, display of the cooking mode, a function for displaying whether or not the cooking operation is being performed, and a heating output control means 76 to be described later. Thus, the function of displaying this when the actual heating output is changed is set.

  In this case, as the heating cooking mode, in addition to the normal heating mode in which cooking is started with a constant heating output, for example, a stir-fried cooking mode, a tempura (fried food) cooking mode, a rice cooking mode, and a kettle mode are set. The operation unit 6 has key switches (for example, “stir fry key”, “tempura key”, “rice key”, “water heater” for selecting each mode of fried food cooking, tempura cooking, rice cooking, and water boiling. A key “)” is provided on the operation unit 6, and a start key and a stop key for starting and stopping heating cooking, an operation dial for setting heating output and cooking time, and the like are also provided. Note that the normal heating mode is automatically selected when the start key is operated.

  The heating output control means 76 includes the heating power setting unit 73 and a heating power comparison circuit 77 that receives the output of the heating power setting unit 73. Among these, the thermal power setting unit 73 receives the output from the heated object detection unit 69 and the set output by the operation unit 6 as output control information, and outputs the output control information and the temperature signal from the heated object temperature determination unit 72. Based on this, the heating output control by the heating coils 12 and 13 and the display control of the display units 20 to 23 are performed.

  Specifically, the thermal power setting unit 73 feeds back the setting output from the operation unit 6 (heating output according to the set cooking conditions and heating cooking mode) with the temperature signal from the heated object temperature determination unit 72 being fed back. The setting heating output has a function of changing the set heating output based on information about the heated object acquired by the heated object detection unit 69, and further displays the changed set heating output on the display unit 20. The function to display in -22 is provided.

  In this case, the thermal power setting unit 73 stores a plurality of types of heating output control patterns corresponding to the temperature detected by the temperature detection element, and the plurality of types of heating outputs according to the set output from the heated object detection unit 69. One of the control patterns is selected. In addition, the thermal power comparison circuit 77 includes the heating output control pattern selected by the thermal power setting unit 73, the current detection signal and the power supplied from the input current detection circuit 62 and the power supply voltage detection circuit 68 through the A / D conversion units 66a and 66b. The actual input power indicated by the voltage signal is compared, and the comparison output is given to the phase difference setting circuit 58. The phase difference setting circuit 58 that has received such a comparison output controls the input power to be the selected heating output control pattern by outputting the phase difference setting voltage Vset corresponding to the comparison output.

  In this embodiment, the phase comparison circuit 55, the difference comparison circuit 57, the phase difference setting circuit 58, the VCO 59, the initial circuit 61, the load state detection circuit 63, the timer circuit 64, and the A / D conversion units 66a, 66b and 71 The electric power detection unit 67, the heated object detection unit 69, the heated object temperature determination unit 72, the heated object determination reference storage unit 74, and the heating output control means 76 constitute an inverter output control circuit 78. The inverter output control circuit (heating control means) 78 is composed of a microcomputer (RISC microcomputer) having a CPU core of RISC architecture. 12 is the same as that shown in Japanese Patent Application No. 2003-11416.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 4 is a flowchart showing the contents of control of a portion according to the gist of the present invention by an inverter output control circuit (hereinafter simply referred to as a control circuit) 78. First, when the user selects which of the three heating units 16 to 18 to use (step A01), the control circuit 78 lights the corresponding usage state display unit 24 (step A02). For example, when the heating unit 16 is selected, the display unit 24L is turned on.

  Next, when the cooking mode is selected by the user (step A1), the control circuit 78 determines whether or not the automatic cooking mode is selected (step A2). When the automatic cooking mode is selected (“YES”), a display corresponding to the progress of the selected automatic cooking is performed (step A3), and heating control is performed according to the selected automatic cooking (step A3). A4). Then, the process returns to step A2 until cooking is completed (step A5, “NO”).

  On the other hand, in step A2, if the user's selection is not the automatic cooking mode ("NO"), it is determined whether or not the cooking mode is "stir fry" (step A7). When a cooked utensil such as a frying pan is used for a fried food, so-called “preheating” is often performed so that the cooking utensil itself is heated to some extent in advance and then cooking is started at a high temperature. Therefore, it is determined whether the “preheating” is performed by the user.

  That is, when the cooking mode is “stir fry” (step A2, “YES”), it is determined whether or not the heating power setting is “medium heat” (step A8). “NO”) It is determined that there is no intention to perform “preheating” and that cooking is to be performed from the beginning, and the stir-fried food display unit 26 lights the display units 26a and 26b indicating that the fried food can be cooked. (See step A9, FIG. 2). Then, the process proceeds to step A4.

Further, when the heating power setting is “medium fire” in step A8 (“YES”), it is determined to be “preheating”, so that the “preheating” display portion 26c is turned on and the frying pan portion is displayed in the stir-fried food display portion 26 Only the display part 26a is turned on (step A10). Then, the temperature is detected by the temperature detectors 40 to 42, and when the preheat set temperature is reached (step A11, “YES”), the “preheat” display portion 26c is turned off (step A12) and the process proceeds to step A9. . FIG. 2 shows the temperature rise state when the cooking mode is “stir fried food” and the temperature reaches an appropriate temperature for performing the fried food through preheating, and the display changes according to the temperature change.
Further, if “NO” is determined in step A7, it is determined that the cooking mode selected by the user is the heating mode. Therefore, in this case, display according to the set thermal power is performed (step A13), and the process proceeds to step A4.

  FIG. 5 is a flowchart showing the processing contents of the cooking progress display in step A3, and an example is shown in which “tempura mode” is selected as the automatic cooking mode. FIG. 3 shows the temperature change of the pan when the “tempura mode” is executed, and the corresponding display change state. The tempura display unit 27 includes a symbol display unit 27a indicating the “tempura mode” and preheating display units 27b to 27d (in FIG. 5, display pattern P1) for indicating a preheating period for heating the oil to an appropriate temperature. ˜P3) and an appropriate temperature display portion 27e indicating that the appropriate temperature has been reached. And these display parts 27a-27e are arrange | positioned integrally in parallel.

First, the control circuit 78 turns on the display unit 27a corresponding to the “tempura mode”. Then, the temperatures detected by the three temperature detectors 40 to 42 are referred to and their maximum values are obtained (step B1). Next, the electric energy detection part 67 detects the electric power consumption () accompanying heat cooking (step B2).
In subsequent step B3, it is determined whether or not the maximum value of the temperature detected in step B1 is equal to or higher than T1, and if the temperature is lower than T1 (“NO”), whether the electric energy detected in step B2 is equal to or higher than W1. It is determined whether or not (step B4). If the amount of power is not greater than or equal to W1 (“NO”), the control circuit 78 blinks the preheat display portion 27b (step B5).

  On the other hand, if the temperature is equal to or higher than T1 in Step B3 (“YES”), and if the electric energy is equal to or higher than W1 (“YES”) in Step B4, the control circuit 78 continuously lights the preheating display portion 27b ( ON), and the preheating display portion 27c blinks to display that the preheating has progressed one step (step B6). After execution of steps B5 and B6, the process proceeds to step B7.

  The heating control is basically performed based on the temperature detected by the temperature detectors 40 to 42. At the same time, the input power amount is also detected and controlled, even if the detected temperature does not rise to the predetermined temperature, if the given input power amount reaches the predetermined value, the temperature detection is performed normally. Since there is a possibility that it has not been detected, it is assumed that the predetermined temperature has been reached, and the control is advanced.

  In subsequent steps B7 and B8, as in steps B3 and B4, the control circuit 78 determines whether or not the temperature is equal to or higher than T2 (> T1) and the electric energy is equal to or higher than W2 (> W1). If it is determined as “YES” in any step, the control circuit 78 continuously lights the preheating display portions 27b and 27c and blinks the preheating display portion 27d (step B9). If it is determined “NO” in any step, the following steps B10 to B12 are executed.

  Steps B10 and B11 determine whether the temperature is equal to or higher than T3 (> T2) and whether the electric energy is equal to or higher than W3 (> W2), similarly to Steps B7 and B8. If “YES” is determined in any step, the control circuit 78 continuously lights the preheating display portions 27b, 27c, and 27d, and lights the display portion 27e that displays “appropriate temperature” (step B12). . In addition, after executing step B12, if it is determined “NO” in both steps B10 and B11, the process returns.

  As a result of executing the control as described above, the display state transitions in the manner shown in FIG. In the “rice cooking mode” shown in FIG. 6 and the “water heater mode” shown in FIG. 7, the basic display control is the same as the flow shown in FIG. 5, and the temperature threshold value set for each automatic cooking mode. In other words, the display mode is changed stepwise according to the cooking progress.

For example, in the “rice cooking mode” of FIG. 6, the display patterns P1 to P3 are changed in the same manner as the “tempura mode” in accordance with the progress of the process “Hitashi”, “cooking”, and “steaming”. In the “steaming” process, “Murashi” is lit and displayed. When the process ends, “Murashi” is turned off and “cooking” is lit and displayed. In the “water heating mode” of FIG. 7, during “heating” until the hot water temperature reaches 100 degrees, a symbol indicating bubbles is displayed inside the symbol of the medicine can, and when the hot water temperature reaches 100 degrees, ”Is performed, but at that stage, the symbol indicating the bubble is turned off and“ Heat retention ”is turned on.
As described above, if the cooking progress status is displayed for each automatic cooking mode, the user can grasp the progress status at a glance by referring to the display of the fluorescent display tube 23. Therefore, for example, it is possible to use it as a guideline for the timing of adding seasonings or the like, or for preparing the next cooking, preparing, etc., which is convenient for cooking work.

  As described above, according to the present embodiment, the fluorescent display tube 23 that displays the cooking setting state in the operation unit 6 and the set cooking progress state is disposed on the lower surface side of the top plate 15, and the control circuit 78 It has an automatic cooking function that automatically controls the heating output of the heating coils 12, 13 based on the output signals of the detection units 40 to 42, and a plurality of cooking modes including an automatic cooking function can be set by the operation unit 6, The selected cooking mode and the cooking progress of the cooking mode can be integrally displayed.

Therefore, the user can easily recognize the progress of the cooking being performed intuitively by referring to the integrated display of both of the above. Even when performing in parallel, cooking can be performed reliably without failure.
In addition, a plurality of heating units 16 to 18, a plurality of heating coils 12 and 13, and a central heater 14 are provided, and the fluorescent display tube 23 includes a plurality of display units 24 </ b> L, 24 </ b> R, and 24 </ b> M corresponding to the plurality of heating units 16 to 18. The display unit 24L, 24R, 24M is displayed with the display unit corresponding to the heating unit selected for cooking, so that the user refers to the use state display unit 24. Thus, it is possible to easily grasp which heating unit is used by itself.

Furthermore, since the fluorescent display tube 23 shares a single display unit for displaying the cooking mode and the automatic cooking progress pattern for the plurality of heating units 16 to 18, the area required for the display unit is reduced. Each display pattern can be enlarged for easy viewing.
In addition, since the display unit is configured by the fluorescent display tube 23, display can be performed with high luminance, and the display can be sufficiently visually recognized even if the portion of the top plate 15 to be displayed is translucent. Moreover, since there is no restriction | limiting of a viewing angle like a liquid crystal display, and the freedom degree of a display is high, the design property of an induction heating cooking appliance can be made favorable.

  Then, the ferrites 35 and 36 are disposed below the heating coils 12 and 13 so that at least a part of the metal member constituting the fluorescent display tube 23 is positioned below the upper surface position of the ferrites 35 and 36. I made it. Therefore, on the lower side of the top plate 15, the influence of the magnetic flux that comes out of the side surfaces of the ferrites 35 and 36 and goes around the upper side of the top plate 15 hardly affects the fluorescent display tube 23. Can be prevented from being excessively induction-heated, and the life of the fluorescent display tube 23 can be guaranteed.

In addition, three temperature detectors are arranged for each heating unit 16 or 17, and the maximum temperature detected by them is obtained, so that cooking is not affected by the shape and size of the pan bottom. It is possible to accurately display the progress status.
In addition, the term “integrated” in “integrated display” in claim 1 is not limited to the form of displaying as in the display unit 25 that displays the “water heater” mode, as disclosed in the above embodiment. A concept including a form in which a display unit 27a for identifying a mode and display units 27b to 27d and 27f for displaying the progress are arranged in parallel like the display unit 27 related to the “tempura” mode. It is.

The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following modifications are possible.
In the flowchart shown in FIG. 5, display control may be performed by detecting only the temperature.
One, two, or four or more temperature detection sensors may be arranged per one heating unit. Further, when there are a plurality of temperature detection sensors, for example, an average of their detection temperatures may be taken. Further, in that case, only a few of the detected temperatures may be averaged.

The display units 24L, 24R, and 24M corresponding to the heating units 12 to 14 may be provided as necessary.
In addition, when there are a plurality of heating units and there is a margin in the display area, a display unit for displaying the cooking mode and its progress status is provided for each of the plurality of heating units. May be.

The display unit is not limited to the one using the fluorescent display tube 23, and a liquid crystal display or an EL (Electro Luminescence) display may be used, or a display using an LED as a light source may be used.
The cooking device does not need to include a device that performs induction heating, and may be any device that performs cooking by some heating means.

The figure which is one Example of this invention, and shows the specific example of a display of the fluorescent display tube arrange | positioned at a heating cooker The figure which shows the temperature change of the pan at the time of executing the "stir fry mode" and the change state of the corresponding display Fig. 2 equivalent when "tempura mode" is executed The flowchart which shows the control content of the part concerning the summary of this invention by an inverter output control circuit The flowchart which shows the processing content of the cooking progress display in step A3 of FIG. Figure 2 equivalent when "rice cooking mode" is executed Figure corresponding to Fig. 2 when "water heating mode" is executed External perspective view showing a state where a cooking device is incorporated in a kitchen cabinet The top view of the principal part shown in the state which removed the top plate of the heating cooker Longitudinal front view near the top plate Depth longitudinal side view near the top plate Diagram showing overall electrical configuration

Explanation of symbols

In the drawings, 2 is a heating cooker, 6 is an operation section (operation means), 12 and 13 are heating coils (heating means), 14 is a central heater (heating means), 15 is a top plate, 16 to 18 are heating sections, Reference numeral 23 denotes a fluorescent display tube (display means), 24 to 30 a display section, 40 to 42 a temperature detection section (temperature detection sensor), and 78 an inverter control circuit (heating control means).

Claims (5)

A top plate that constitutes the upper surface of the cooker body and on which the cooked utensil is placed in the heating unit;
Heating means for heating the cooking utensil placed on the heating unit;
A temperature detection sensor disposed on the lower surface side of the heating unit;
Operation means for performing a setting operation related to the control of the induction heating;
Heating control means for controlling the heating means based on the setting operation;
Display means for displaying the cooking setting state in the operation means and the progress status of the set cooking,
The heating control means has an automatic cooking function for automatically controlling the heating output of the heating means based on the output signal of the temperature sensor,
The operation means can set a plurality of cooking modes including the automatic cooking function,
The said display means is comprised by the lower surface side of the said top plate, and is comprised so that the cooking progress of the selected cooking mode and the said cooking mode can be displayed integrally, The cooking device characterized by the above-mentioned. A plurality of the heating unit and heating means are provided,
The display means includes a plurality of display units corresponding to the plurality of heating units, and is configured to display a display unit corresponding to the heating unit selected for cooking by heating. The cooking device according to claim 1, wherein A plurality of the heating unit and heating means are provided,
The display means includes
A plurality of display units corresponding to the plurality of heating units;
While displaying the one corresponding to the heating unit selected to perform cooking, among the plurality of display units,
The cooking device according to claim 1 or 2, wherein a display unit for displaying the cooking mode and the progress pattern of the automatic cooking is shared.   The cooking device according to any one of claims 1 to 3, wherein a plurality of the temperature detection sensors are arranged per one heating unit. The cooking device according to any one of claims 1 to 4, wherein the display means includes a fluorescent display tube.

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