JP2012109208A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker capable of reducing incorrect detection of boiling-over due to movement of a pan during cooking.SOLUTION: An induction heating cooker is provided with a cooking menu setting part 15 for selecting cooking menu, a heating power setting part 16 for setting the input power to a heating coil 2a, and boiling-over determination means ( control circuit 6) for determining that boiling-over occurs when the amount of change in capacitance exceeds a prescribed threshold value. The induction heating cooker has a mode for controlling a drive circuit 5 based on the cooking menu selected by the cooking menu setting part 15 and a manual mode for controlling the drive circuit 5 based on the input power set by the heating power setting part 16, as operation modes for the control circuit 6, and has a first menu in which a pan is little moved during cooking, as cooking menus, and when the first menu is selected, the boiling-over determination means determines the occurrence of boiling-over at a lower threshold value than when operating in manual mode.

Description

  The present invention relates to an induction heating cooker that detects spillage based on a change in capacitance between an electrode installed around a heating coil and a predetermined potential.

  As an example of an induction heating cooker for detecting a conventional spill, as described above, “a top plate for placing a heated object such as a pan into which the object is to be cooked, a heating coil for heating the heated object, High-frequency power supply means for supplying high-frequency power for induction heating by a heating coil, a plurality of arc-shaped electrodes arranged under the top plate, and a capacitance detection means for detecting a capacitance of the electrodes , Detection of capacitance change by the capacitance detection means to detect whether or not the cooking object has been spilled, and based on the instructions of the spill detection means, the high-frequency power supply means It has a control means to control the high-frequency power to be supplied, and the electrode can cope with the influence of interference on the capacitance due to the difference in size of the object to be heated and induction heating. It is what was using a plurality of arc-shaped electrodes "for (e.g., see Patent Document 1).

JP 2010-182626 A (3rd page, FIG. 2)

In a conventional induction heating cooker that detects spilling, a high frequency voltage is applied between an electrode and a predetermined potential, and a change in capacitance is measured by the amount of attenuation. At this time, when the spillage occurs, the spillage is determined by utilizing the fact that the contents of the pan come into contact with the top plate above the electrode and the capacitance changes.
However, the capacitance also changes when the pan is placed on the top plate above the electrode by moving the pan during cooking. For this reason, when the pan is moved, there is a possibility that it is erroneously determined that the spill has occurred even if the spill has not occurred.

  This invention is made | formed in order to solve the above subjects, and provides the induction heating cooking appliance which can reduce the misdetection of the boiling over by movement of a pan.

  An induction heating cooker according to the present invention includes a top plate on which a pan is placed, a heating coil that is provided under the top plate and that heats the pan, a cooking menu selection unit that selects a cooking menu, and the heating A heating power setting means for setting power to be applied to the coil, a driving circuit for supplying a high-frequency current to the heating coil, a control means for controlling the driving circuit, and a lower side of the top plate near the heating coil. The provided electrode, a capacitance measuring means for measuring a capacitance between the electrode and a predetermined potential, and a change amount of the capacitance measured by the capacitance measuring means is a predetermined threshold. Spillover determining means for determining that spillage has occurred when the value exceeds the value, and the cooking menu selected by the cooking menu selection means is selected as the operation mode of the control means. And a manual mode for controlling the drive circuit based on the input power set by the heating power setting means, and the cooking menu is almost moved during cooking. A first menu that is not present, and when the first menu is selected by the cooking menu selection unit, the boiling-out determination unit detects occurrence of overflowing at a lower threshold than when operating in the manual mode. Judgment.

  According to the present invention, since the threshold value for determining the overflow is changed based on the operation mode and the cooking menu, an easy-to-use induction heating cooker that can reduce erroneous detection of the overflow due to the movement of the pan is provided. Can be provided.

It is a figure which shows the main structures of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a figure which shows the operation part of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a functional block diagram of the main structures of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a functional block diagram of the main structures of the induction heating cooking appliance which concerns on Embodiment 1, and has shown the state which mounted the pan. 6 is a diagram for explaining a spillage determination threshold according to Embodiment 1. FIG. It is a functional block diagram of the main structures of the induction heating cooking appliance which concerns on Embodiment 2. FIG.

Embodiment 1 FIG.
[Configuration of induction heating cooker]
FIG. 1 is a diagram showing a main configuration of the induction heating cooker according to Embodiment 1, and is a schematic top view of the induction heating cooker. As shown in FIG. 1, the induction heating cooker 100 includes a box-shaped housing 1 and a top plate 8 placed on the upper surface opening of the housing 1. The top plate 8 is entirely made of a material such as heat-resistant tempered glass or crystallized glass, and is fixed in a watertight state between the upper surface opening outer periphery of the housing 1 via a rubber packing or a seal material. The top plate 8 is provided with a coating film and the like, and the inside of the housing 1 cannot be visually recognized when the induction heating cooker 100 is viewed from above, but in FIG. It has shown in the state which permeate | transmitted.

  As shown in FIG. 1, the induction heating cooker 100 according to the first embodiment includes three heating ports, and corresponds to each heating port, below the top plate 8 and on the casing 1. Each is provided with heating means. The induction heating cooker 100 includes a heating coil 2a, a heating coil 2b, and a heating coil 2c (hereinafter, referred to as “heating coil 2” when common matters are described) as heating means. The heating coil 2 is configured by winding a wire in a ring shape.

  A temperature sensor 4a is provided below the top plate 8 and in the vicinity of the heating coil 2a, a temperature sensor 4b is provided in the vicinity of the heating coil 2b, and a temperature sensor 4c is provided in the vicinity of the heating coil 2c. Yes. In the first embodiment, the temperature sensors 4a, 4b, and 4c are respectively disposed between the vortices of the corresponding heating coils. The temperature sensors 4a, 4b, and 4c detect the temperature of the pan, which is an object to be heated, placed on the top plate 8 of the corresponding heating port, and output the detected information to the control circuit 6 described later.

  On the front side of the top surface of the top plate 8, operation units 10a, 10b, and 10c for receiving operation inputs such as setting of a cooking menu, setting of heating power, and a heating instruction are provided. The operation unit 10a accepts an operation input for the heating coil 2a, the operation unit 10b accepts an operation input for the heating coil 2b, and the operation unit 10c accepts an operation input for the heating coil 2c. Output to.

FIG. 2 is a diagram illustrating the configuration of the operation unit 10a according to the first embodiment. In FIG. 2, only the operation unit 10a is illustrated, but the operation unit 10b and the operation unit 10c have the same configuration as the operation unit 10a.
The operation unit 10 a includes a cooking menu setting unit 15 (cooking menu selection means) that is an input button for selecting a cooking menu, and a heating power setting unit 16.

  Here, the cooking menu will be described. Generally, there are cooking methods such as boiling, boiled, cooked rice, grilled, fried and fried. In the first embodiment, as a button for selecting a cooking menu classified by these cooking methods, a cooking menu setting unit 15 including a fried food menu 11, a rice cooking menu 12, a noodle boiled menu 13, and a fried food menu 14 is provided. ing. When any of the cooking menu setting units 15 is selected by the user, the induction heating cooker 100 drives the heating coil 2 by a control sequence corresponding to the selected cooking menu.

  The thermal power setting unit 16 is an input button for setting the input power of the heating coil 2a. In the first embodiment, there are provided thermal power buttons 16a, 16b, and 16c for setting three types of input power of “weak”, “medium”, and “strong”. When the user inputs to the thermal power setting unit 16, the induction heating cooker 100 inputs the set power to the heating coil 2. In the following description, a mode in which the heating coil 2 is driven based on the input power of the heating power setting unit 16 set by the user may be referred to as a manual mode.

  Three arc-shaped electrodes 3a1, 3a2, 3a3 corresponding to the outer shape of the heating coil 2a are arranged below the top plate 8 and in the vicinity of the outer peripheral side of the heating coil 2a. In the first embodiment, three electrodes 3a1, 3a2, 3a3 are arranged so as to surround the outer periphery of the heating coil 2a. Further, electrodes 3b1, 3b2, 3b3 are provided in the vicinity of the outer peripheral side of the heating coil 2b, and electrodes 3c1, 3c2, 3c3 are provided in the vicinity of the outer peripheral side of the heating coil 2c. In the following description, when the matters common to the electrodes 3a1, 3a2, 3a3, the electrodes 3b1, 3b2, 3b3, and the electrodes 3c1, 3c2, 3c3 are described, they may be collectively referred to as “electrode 3”. The electrodes installed in each heating coil, for example, the electrodes 3a1, 3a2, 3a3, have substantially the same electrode area, and are arranged concentrically with the heating coil 2a so as to be in close contact with the lower surface of the top plate 8.

  FIG. 3 is a functional block diagram of the main configuration of the induction heating cooker according to the first embodiment, and FIG. 4 is a functional block diagram of the main configuration of the induction heating cooker according to the first embodiment. The state is shown. 3 and 4, only the heating coil 2a, the electrodes 3a1, 3a2, 3a3, and the temperature sensor 4a are shown, but the heating coils 2b, 2c, electrodes 3b1, 3b2, 3b3, electrodes 3c1, 3c2, 3c3 are shown. The temperature sensors 4b and 4c have the same configuration.

  As shown in FIG. 3 and FIG. 4, the induction heating cooker 100 converts the AC voltage of the AC power source into a DC voltage, and drives the heating coils 2a, 2b, 2c with a high-frequency current, A control circuit 6 that controls the circuit 5 and a capacitance measuring circuit 7 (capacitance measuring means) are provided.

  The control circuit 6 controls the drive circuit 5 based on signals from the operation units 10a, 10b, and 10c and signals from the temperature sensors 4a, 4b, and 4c, and also controls the operation of the induction heating cooker 100 as a whole. In addition, the control circuit 6 also has a function as a spillage determination unit that determines whether or not spillage has occurred based on the capacitance detected by the capacitance measurement circuit 7.

  As shown in FIG. 4, a pan 30 is placed and used on the top plate 8 as a cooking utensil that is an object to be heated. On the top plate 8, a circular pan position display indicating a rough placement position of the pan 30 is provided corresponding to the heating coils 2a, 2b and 2c. The user can place the pan 30 on each heating coil 2 with reference to the pan position display.

Next, operation | movement of the induction heating cooking appliance 100 which concerns on Embodiment 1 is demonstrated.
First, an outline of the overflow determination operation will be described.
In a state where there is no spillage, air having a relative dielectric constant of 1 exists on the top plate 8 above the electrode 3, so that the capacitance between the electrode 3 and GND is small. Here, in the state where spilling has occurred, since the spilled pan content mainly composed of water having a relative dielectric constant of 80 adheres to the top plate 8 above the electrode 3, the capacitance between the electrode 3 and the GND Will soar.

  Therefore, the control circuit 6 detects the electrostatic capacitance between the electrode 3 and GND at all times or periodically, and determines whether or not the amount of change exceeds a predetermined threshold value, thereby determining whether or not the overflow has occurred. Determine. For example, the storage means for storing a predetermined delay time is constituted by a delay circuit and a comparison circuit, and the storage means allows the previous capacitance and the current capacitance to be input to the comparison circuit to output a differential voltage. The differential voltage and a reference voltage formed by dividing the constant voltage are input to the comparison circuit, and it is determined whether or not the capacitance has changed depending on whether or not the output is a positive voltage.

  Then, when the change amount of the electrostatic capacitance exceeds the threshold value, the control circuit 6 determines that the overflow has occurred and stops driving the corresponding heating coil 2 or puts it into the heating coil 2. Lower power to eliminate spills. In addition, when it is determined that the spilling has occurred, the user is notified that the spilling has occurred by a notifying unit such as a display unit or a voice output unit (not shown).

  Here, since the electrodes 3a1, 3a2, 3a3 are in close contact with the top plate 8, the distance between the electrode 3a1, 3a2, 3a3 and the electrode 3a1, 3a2, 3a3 is the thickness of the top plate 8. It is limited to. For this reason, variation in the electrodes 3a1, 3a2, 3a3 reaction can be suppressed. The areas of the electrodes 3a1, 3a2, 3a3 are substantially the same. Thereby, variation in reaction between the electrodes can be suppressed, so that it is not necessary to provide a threshold value for each electrode. Furthermore, since the electrodes 3a1, 3a2, 3a3 are arranged concentrically on the outer periphery of the heating coil 2a, it is possible to detect spillage from any position of the pot 30.

  FIG. 5 is a diagram for explaining a spillage determination threshold according to the first embodiment. As shown in FIG. 5, induction heating cooker 100 according to the first embodiment has a threshold value a and a threshold value higher than threshold value a as threshold values for determining boiling over. A plurality of threshold values called threshold value b are provided. And the control circuit 6 selects the threshold value at the time of determining a spill over based on the cooking menu selected by the cooking menu setting part 15 of the operation part 10.

  Below, operation | movement of the induction heating cooking appliance 100 for every selected cooking menu is demonstrated.

(Cooking menu)
When the rice cooking menu 12 is selected, the control circuit 6 controls the drive circuit 5 so that the temperature sequence is optimal for rice cooking, and turns on the power to the heating coil 2. For example, a water absorption process is performed in which the state where the temperature sensor 4 detects a value of about 60 degrees is continued for about 10 minutes, and the rice is allowed to absorb water. Then, the cooking process which increases input electric power is performed and rice is cooked. After cooking is completed, a heat retention process is performed to adjust the input power to the heating coil 2 so that the detected value of the temperature sensor 4 is about 70 degrees, and the cooked rice is warmed.

(Noodle boiled menu)
When the noodle boiled menu 13 is selected, the control circuit 6 supplies power to the heating coil 2 until it detects boiling of water in the pan 30 based on the detection value of the temperature sensor 4. After detecting the boiling, the power applied to the heating coil 2 is increased or decreased every predetermined time. This changes the movement of the water inside the pot, prevents the noodles put in the pot from sinking into the bottom or solidifying, and makes the noodles put in the pot evenly boiled. .

  Cooking, such as cooking rice, boiled, and stewed, as typified by rice cooking menu 12 and boiled noodle menu 13, is a cooking method that is relatively easy to spill, and cooking with little movement of pan 30 during cooking. It can be said that it is a method. Here, a cooking menu in which spilling is likely to occur and the pan 30 is hardly moved during cooking is referred to as a first menu.

  When such a first menu (rice cooking menu 12, noodles boiled menu 13) is selected, the control circuit 6 selects the threshold value a which is the lower threshold value, and determines the overflow. Do. Since the first menu is likely to cause a spill, it is possible to detect a spill at an earlier stage by performing a spill determination with a lower threshold value a. In addition, since the first menu hardly moves the pan 30 during cooking, even if the lower threshold value a is used, misdetection of spilling by moving the pan 30 is unlikely to occur.

(Fry menu)
When the fried food menu 14 is selected, the control circuit 6 controls the input power to the heating coil 2 so that the detection value of the temperature sensor 4 becomes a temperature suitable for the fried food (for example, 200 degrees).

  When cooking such as baking or frying as in the fried food menu 14, cooking is often performed by moving the pan 30 during heating so that heat is evenly applied to the ingredients in the pan. Is unlikely to occur. Here, the cooking menu that is less likely to spill and that can easily move the pan 30 during cooking is referred to as a second menu.

  When such a second menu (stir-fried food menu 14) is selected, the control circuit 6 selects the threshold value b which is the higher threshold value, and determines the overflowing. In the case of a cooking method in which the pan 30 is easy to move during cooking, the capacitance between the electrode 3 and GND changes by moving the pan 30. Therefore, if the threshold for determining the spill is too low, the spill does not occur. There is a risk that it may be determined that it is spilled. However, by determining the spillage at a higher threshold value b, it is possible to suppress erroneous detection of spillage due to a change in capacitance caused by moving the pan 30.

(Fried food menu)
When the deep-fried food menu 11 is selected, the control circuit 6 controls the input power to the heating coil 2 so that the detected value of the temperature sensor 4 becomes a temperature suitable for the deep-fried food (for example, 180 degrees).

When fried food cooking such as the fried food menu 11 is performed, the pan 30 is often not moved during the heating, and it is difficult for spilling to occur. Here, the cooking menu in which the spilling is unlikely to occur and the pan 30 is difficult to move during cooking is referred to as a third menu.
In this third menu (fried food menu 11), spilling is unlikely to occur, but if the oil in the pan is accidentally spilled or if a large amount of oil splashes, the oil will be hot. Therefore, it is preferable for the safety of the user to immediately stop the heating.

  Therefore, when the third menu (fried food menu 11) is selected, the control circuit 6 selects the threshold value a, which is the lower threshold value, and determines the overflow. Thereby, when the oil in a pan spills on the top plate 8, a spill can be detected at an early stage. In addition, in the case of the third menu, since the pan 30 is often not moved during cooking, erroneous detection of spilling by moving the pan 30 is unlikely to occur.

(Manual mode)
In the manual mode, that is, when the user selects an arbitrary thermal power by the thermal power setting unit 16 and performs cooking, the control circuit 6 supplies power corresponding to the setting in the thermal power setting unit 16 to the heating coil 2. In

  In the manual mode in which the user freely selects input power such as strong, medium, and weak, cooking is often performed while moving the pan 30. Therefore, in the manual mode, the control circuit 6 selects the threshold value b, which is the higher threshold value, and determines the overflow. By determining the spillage at a higher threshold value b, it is possible to suppress erroneous determination that the spillage has occurred due to a change in the capacitance caused by moving the pan 30.

(Change of threshold value by input power)
As described above, in the first embodiment, the threshold value for the determination of the spillage is selected based on the cooking menu set by the operation unit 10. In addition to this, the threshold value for the determination of spillage is also determined by the input power. adjust. As shown in FIG. 5, the threshold value a and the threshold value b have such characteristics that the threshold value decreases as the input power to the heating coil 2 increases. The spillage tends to occur when the input power is large, and the amount of spillage tends to increase according to the input power. Therefore, by reducing the threshold value for determining the spillage as the input power increases, the spillage can be detected earlier when the spillage is likely to occur. In addition, by increasing the threshold value a and the threshold value b as the input power decreases, erroneous determination of spillage can be suppressed at low power when spillage is unlikely to occur.

  As described above, according to the first embodiment, the threshold value for determining the overflow is set based on the selected cooking menu. When the first menu, which is a cooking menu that is likely to cause boiling over such as cooked rice, boiled noodles, and stewed, and that hardly moves the pan 30 during cooking, is a threshold lower than the threshold value b. The spillage is judged using the threshold value a which is a value. By doing in this way, a spill can be detected quickly and the amount of spill can be suppressed. In addition, in the second menu, which is a cooking menu in which frying spills such as cooking of stir-fried food are unlikely and the pan 30 is easy to move during cooking, and in the manual mode where the user arbitrarily selects the input power and performs cooking by heating. The spillage is judged using a threshold value b which is a threshold value higher than the threshold value a. By doing in this way, the misdetection of the spilling accompanying the movement of the pans 30, such as a pot shake during cooking, can be suppressed. Therefore, for example, when control is performed to stop heating or reduce the input power when spilling is detected, during cooking in the second menu or manual mode, it is difficult to falsely detect spilling even if the pan is shaken. Therefore, it is easy to use without stopping heating or reducing the input power.

  In the first embodiment, the threshold value a and the threshold value b are relatively decreased as the input power to the heating coil 2 is increased, and the threshold value is decreased as the input power to the heating coil 2 is decreased. a and the threshold value b are relatively increased. For this reason, it is possible to determine the spillage earlier when the power is likely to spill, and to prevent erroneous detection of the spill when the power is less likely to spill.

In the first embodiment, when the noodle boiled menu 13 is selected, the input power is increased or decreased. For this reason, the noodles thrown into the pan are stirred by the change in the input power, and the noodles can be boiled uniformly.
Also in the noodle boiled menu 13, as described above, the threshold for determining the overflow is reduced as the input power increases. Therefore, it is possible to detect spillage early when the input power is high while realizing high-quality noodle boiled by adding strength to the input power.

Embodiment 2. FIG.
In the second embodiment, another configuration example of the heating coil will be described.
FIG. 6 is a functional block diagram of the main configuration of the induction heating cooker according to the second embodiment. The second embodiment is different from the first embodiment in that a heating coil 22a is provided instead of the heating coil 2a shown in FIG. In the second embodiment, differences from the first embodiment will be mainly described, and the same reference numerals are given to the components corresponding to the first embodiment.

  The heating coil 22a shown in FIG. 6 is a two-part energization coil, and includes an inner heating coil 22a1 positioned on the inner side in the radial direction and an outer heating coil 22a2 positioned on the outer side in the radial direction. The inner heating coil 22a1 and the outer heating coil 22a2 are individually driven by the drive circuit 5. Further, a space is provided between the inner heating coil 22a1 and the outer heating coil 22a2, and the temperature sensor 4a is disposed in this space.

The basic operation of the induction heating cooker according to the second embodiment is the same as that of the first embodiment. However, in the second embodiment, the operation when the noodle boiled menu 13 is selected is different.
When the noodle boiled menu 13 is selected, the control circuit 6 supplies power to both the inner heating coil 22a1 and the outer heating coil 22a2 until the boiling of water in the pan is detected based on the detection value of the temperature sensor 4a. To do. After detecting boiling, power is alternately supplied to the inner heating coil 22a1 and the outer heating coil 22a2. Thus, by alternately heating the inner side and the outer side of the pot 30 in the radial direction, the movement of water inside the pot can be changed, and the noodles put in the pot can be evenly boiled.

  Further, the noodle boiled menu 13 which is the first menu is a cooking menu which is likely to cause spilling and hardly moves the pan 30 during cooking, so the control circuit 6 has a lower threshold value. The threshold value a (see FIG. 5) is selected, and the determination of spillage is made. Then, similarly to the first embodiment, the threshold value a is adjusted so as to relatively decrease the value of the threshold value a as the input power is increased, and the overflow determination is performed.

  As described above, in the second embodiment, when the heating coil 22a including the inner heating coil 22a1 and the outer heating coil 22a2 is used and the noodle boiled menu 13 is selected, the inner heating coil 22a1 and the outer heating coil 22a2 are used. The power was turned on alternately. By doing in this way, the radial inner side and the outer side of the pan 30 can be alternately heated, the movement of the water inside the pan is changed, and the noodles thrown into the pan 30 can be boiled uniformly. In the determination of spillage, the threshold value a which is the lower threshold value is used, and the threshold value a is set so that the threshold value a is relatively lowered as the input power to the heating coil 22a is increased. I corrected it. For this reason, similar to the first embodiment, it is possible to detect the spillage at an early stage, and to suppress erroneous detection of the spillage.

  In the above description, when the amount of change in the capacitance exceeds the threshold value a or the threshold value b, it is determined that the overflow has occurred. If the state has continued for a predetermined time, it may be determined that a spill has occurred. By doing in this way, it can suppress that the instantaneous change of the electrostatic capacitance by noise or a pot shake is determined to be spilling, and the spilling detection with high accuracy can be performed.

  In addition, if a change in capacitance of any one of the plurality of electrodes (for example, electrodes 3a1, 3a2, 3a3) corresponding to each of the heating coils 2a, 2b, 2c exceeds a threshold value, it will be blown out. However, it may be determined that spilling has occurred when the amount of change in capacitance of any two or more of the plurality of electrodes exceeds a threshold value. In addition, the number of electrodes provided in each heating coil may be one, two, or four or more.

In the above description, the cooking menu is classified into the first menu, the second menu, and the third menu, the rice cooking menu 12 and the noodle boiled menu 13 are provided as the first menu, and the fried food menu 14 is provided as the second menu. The example which provided the fried food menu 11 as the 3rd menu was shown. However, the specific cooking menu is not limited to this.
Moreover, it is sufficient to select a threshold value for determining the spillage in each cooking menu based on the likelihood of spilling in each cooking menu and the presence or absence of movement of the pan during cooking. You may make it select a threshold value from a value according to a cooking menu.

  1 housing, 2 heating coil, 2a heating coil, 2b heating coil, 2c heating coil, 3 electrode, 3a1, 3a2, 3a3 electrode, 3b1, 3b2, 3b3 electrode, 3c1, 3c2, 3c3 electrode, 4 temperature sensor, 4a temperature Sensor, 4b Temperature sensor, 4c Temperature sensor, 5 Drive circuit, 6 Control circuit, 7 Capacitance measurement circuit, 8 Top plate, 10 operation unit, 10a operation unit, 10b operation unit, 10c operation unit, 11 Fried food menu, 12 Rice cooking menu, 13 Noodle boiled menu, 14 Stir fry menu, 15 Cooking menu setting section, 16 Thermal power setting section, 16a, 16b, 16c Thermal power button, heating coil, 22a1 inner heating coil, 22a2 outer heating coil, 30 pot, 100 induction Cooking cooker.

Claims (8)

A top plate on which the pan is placed;
A heating coil provided under the top plate for heating the pan;
Cooking menu selection means for selecting a cooking menu;
Thermal power setting means for setting the input power to the heating coil;
A drive circuit for passing a high-frequency current through the heating coil;
Control means for controlling the drive circuit;
An electrode provided under the top plate and in the vicinity of the heating coil;
A capacitance measuring means for measuring a capacitance between the electrode and a predetermined potential;
A spill determining unit that determines that a spill has occurred when the amount of change in the capacitance measured by the capacitance measuring unit increases above a predetermined threshold; and
As an operation mode of the control means, a mode for controlling the drive circuit based on the cooking menu selected by the cooking menu selection means, and a control for the drive circuit based on the input power set by the heating power setting means. Manual mode,
The cooking menu has a first menu that hardly moves the pan during cooking,
When the first menu is selected by the cooking menu selection unit, the overflow determination unit determines the occurrence of the overflow with a lower threshold than when operating in the manual mode. Cooking cooker. The control means controls the drive circuit so as to stop the drive circuit or reduce the high-frequency current flowing through the heating coil when the blow-out determination means determines that the overflow has occurred. The induction heating cooker according to claim 1, wherein The cooking menu selection means includes:
As the selectable first menu,
The induction heating cooker according to claim 1 or 2, comprising at least one of cooked rice, boiled, and boiled. The control means, when the first menu is selected by the cooking menu selection means, controls the electric power supplied to the heating coil in accordance with the cooking process constituting the first menu. The induction heating cooker according to claim 3. The heating coil is divided into a plurality of parts,
The induction heating cooker according to claim 4, wherein the control unit individually controls electric power for each of the divided heating coils. The induction heating cooking according to any one of claims 1 to 5, wherein the spillage determination means lowers the predetermined threshold value as the electric power supplied to the heating coil increases. vessel. The induction heating cooker according to any one of claims 1 to 6, wherein the electrode is provided in close contact with a lower surface of the top plate on an outer peripheral side of the heating coil.   The induction heating cooker according to any one of claims 1 to 7, comprising a plurality of the electrodes, wherein the plurality of electrodes have substantially the same area.

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