JP2005259625A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker which can control drive by detecting pan curvature correctly, while incorrect detection of the pan curvature does not occur. <P>SOLUTION: When an operation of the first temperature elevation value ▵T1 between a first lapse of time t1 and a second lapse of time t2 from the start of heating is carried out, an instruction for a stop of a heating action is outputted if a comparison between the first temperature elevation value ▵T1 and a detection level of the pan curvature set in advance is made and the first temperature elevation value ▵T1 is smaller, and furthermore, when the calculation of the second temperature elevation value ▵T2 between the first lapse of time t1 and the third lapse of time t3 which is longer than the second lapse of time t2 is carried out, the direction is made to enable a setting temperature to be reduced by a prescribed value if the comparison between the second temperature elevation value ▵T2 and the detection level of the pan curvature set in advance is made and the second temperature elevation value ▵T2 is smaller. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an induction heating cooker in which appropriate control is performed with respect to warping of the bottom of a cooking pot.

  Generally, in an induction heating (IH) cooker, the temperature of a cooking pan is detected through a top plate by a temperature detection means such as a thermistor disposed at the center of a heating coil under the top plate on which the cooking pan is placed. Heating control is performed. On the other hand, in some cooking pans, the center of the pan bottom is raised upward in consideration of strength, ease of handling, and the like, and the pan bottom center is away from the top plate, that is, the pan bottom is warped. When heating a cooking pan with a warped pan bottom with an induction heating cooker, an air layer is formed between the center of the pan bottom and the top plate, which is insulated and the heat of the cooking pan is placed under the top plate. The temperature detected by the temperature detecting means is lower than the actual cooking pot temperature, and the temperature detection accuracy is lowered, causing abnormal heating.

  On the other hand, conventionally, as described in Patent Document 1, for example, a temperature detector that detects the temperature of the cooking pan, and a control circuit that controls energization of the heating coil based on a signal from the temperature detector. And the control circuit has two or more control temperature values having different set temperatures, the higher control temperature value is used during normal heating, and the unit of the temperature detector at the start of heating. When the temperature rise value per time is equal to or less than a preset value, there is a configuration in which the heating coil is controlled using a lower control temperature value.

With this configuration, when cooking is performed using a cooking pot having a warped bottom surface, oil in the cooking pot can be prevented from being abnormally heated and ignited.
JP-A-5-290966 (FIGS. 2 and 3)

  However, in the conventional technology as described above, the pan warp is determined based on one temperature rise value and one comparison determination value only once after a unit time from the start of heating, and either one of the two set temperatures of high and low is set. As a result, it becomes possible to use cooking pots with a large amount of warpage, and if the preset value is compared with the temperature rise per unit time from the start of heating, the amount of oil is large. Sometimes even if the pan warp is small, the temperature rise of the top plate will be smaller, so it will be controlled using the lower control temperature, so cooking with a low oil temperature will result in cooking failure Cause.

  Moreover, if the preset value is reduced, it will be determined that the cooking pan can be used even if the pan has a large warp, and control will be performed using the higher control temperature, which may cause abnormal heating. There is a fear.

  Then, this invention is made | formed in order to solve such a subject, and it aims at providing the induction heating cooking appliance which eliminates the misdetection of a pan warp and can detect and drive-control correctly a pan warp correctly. Is.

  In order to achieve the above object, the present invention provides an induction heating means including a heating coil and a switching element disposed under a top plate on which a cooking pan is placed, and electric power for driving and controlling the induction heating means. Variable means, temperature detection means arranged below the top plate for detecting the temperature of the cooking pan, and instructing the electric power variable means to perform drive control based on a comparison result between the detected temperature of the temperature detection means and the set temperature. In addition, the temperature control means for calculating the rise value of the detected temperature of the temperature detection means, the rise value of the detected temperature calculated by the temperature control means is compared with a preset pan warp detection level, and the comparison result Temperature comparison means for outputting an instruction of drive control based on the power variable means or the temperature control means, wherein the temperature comparison means has a first elapsed time and a second elapsed time from when the temperature control means starts heating. When the first temperature rise value is calculated, the first temperature rise value is compared with a preset first pan warp detection level, and the first temperature rise value is smaller. An instruction to stop the heating operation is output to the power variable means, and the temperature control means outputs a second temperature rise value between the first elapsed time and a third elapsed time longer than the second elapsed time. When calculated, the second temperature rise value is compared with a preset second pan warp detection level, and if the second temperature rise value is smaller, the temperature control means sets the set temperature to a predetermined value. It is characterized by instructing to decrease.

  Further, the temperature comparing means calculates the third temperature rise value when the temperature control means calculates a third temperature rise value between the first elapsed time and a fourth elapsed time longer than the third elapsed time. If the third temperature rise value is smaller by comparing the temperature rise value of the temperature and the preset third pan warp detection level, the temperature control means is instructed to lower the set temperature by a predetermined value. It is a feature.

  Moreover, the said control is applied to the control of deep-fried food cooking.

  According to the present invention, first, the first temperature rise value between the first elapsed time and the second elapsed time from the start of heating is compared with the preset first pan warp detection level, If the temperature rise value is smaller, it is determined that the pan has a large pan warp and may cause abnormal heating, and the heating operation is stopped. Then, the second temperature rise value between the first elapsed time and the third elapsed time longer than the second elapsed time from the start of heating is compared with a preset second pan warp detection level. If the second temperature rise value is smaller, it is judged that the range is controllable although there is a pan warp, and the set temperature is lowered by a predetermined value. This eliminates erroneous detection of pan warpage, and enables correct drive detection and control of pan warpage.

  Further, the third temperature rise value between the first elapsed time and the fourth elapsed time longer than the third elapsed time from the start of heating is compared with a preset third pan warp detection level. If the third temperature rise value is smaller, the set temperature is lowered by a predetermined value. Therefore, the pan warp can be detected more finely and reflected in the control.

  In addition, by applying the above control to the control of deep-fried food cooking, when a cooking pan that has a large warp and may cause abnormal heating is used, the heating is stopped. Can be reliably prevented from firing due to abnormal heating. Further, the control for lowering the set temperature is performed by using a second temperature rise value between the first elapsed time and the third elapsed time longer than the second elapsed time from the start of heating, and further, the first elapsed from the start of heating. Since the third temperature rise value between the time and the fourth elapsed time longer than the third elapsed time is compared with the second and third temperature detection levels set in advance corresponding to the third temperature rise value. Since the setting range of the second and third temperature detection levels is widened and the warp of the pan is small, the amount of oil is large, so that the set temperature can be prevented from being lowered and causing a cooking failure.

  Hereinafter, the built-in induction heating cooking device which becomes one Example of this invention is demonstrated based on each drawing. In addition to the built-in induction heating cooker described below, the induction heating cooker that is the subject of the present invention is a simple desktop induction heating cooker having only one induction heating (IH) heating coil. It is also applicable to.

  1 and 2, a ceramic top plate (top plate) 3 is attached to a top plate frame 2 provided around the upper surface of the main body 1 of the built-in induction heating cooker. The rear part is provided with a ventilation part 4 provided with an intake port and an exhaust port into the main body 1. A ventilation cover 4 a having a large number of punching holes is detachably attached to the ventilation portion 4. Here, the front part of the top frame 2 is a side part of the top frame 2 on the user side when the main body 1 is incorporated in a sink 18 described later and used by the user, and the rear part. Is the opposite side of the front, ie the side farthest from the user.

  A top panel operation unit 5 is provided on the front side of the top frame 2, and a display unit 6 is provided in the center on the front side of the top plate 3. On the left side of the front surface of the main body 1, a roaster portion 7 having a cooking chamber inside is disposed, and the roaster portion 7 has a door 8. On the other hand, an operation unit 9 is arranged on the right side of the front surface of the main body 1. The operation unit 9 includes an output setting unit 10 for an induction heating unit, a timer setting unit 11 for performing a timer operation, and a power switch 12. Is provided.

  The display unit 6 is disposed below the top plate 3, the top plate portion facing the display unit 6 is formed transparent, and is configured so that the user can see the display unit 6 through the top plate 3. Yes.

  In addition, the top panel operation unit 5 is configured to enable operation instruction setting similar to the operation unit 9 on the front side. Therefore, since the top panel operation unit 5 conventionally has only the operation unit 9 on the front surface of the main body, the top plate on the upper surface of the main body is solved by solving the problem that when operating, the user must operate while moving his eyes. By concentrating in the vicinity of 3, the user can perform stirring and adjusting the heating in a cooking pan in a standing posture, thereby improving usability.

  On the left and right of the front part on the top plate 3, induction heating parts 13 and 14 are formed by printing the positions of two induction heating coil parts to be described later, and the center of the rear part is for an aluminum pan that cannot be induction heated. A heater heating section 15 is formed in which the position of the radiant heater is drawn by printing. Under each induction heating unit 13, 14, an induction heating coil unit for induction heating the cooking pan placed on the top plate 3 is arranged correspondingly, and below the heater heating unit 15, the top plate A radiant heater for heating the cooking pan placed on the heater 3 is arranged correspondingly. On the front side of each induction heating unit 13, 14, output display units 16, 17 formed of LEDs or the like for displaying their outputs are provided.

  As shown in FIG. 3, the main body 1 is formed in a recess provided in a sink 18 installed in a general household kitchen so that the top plate 3 is exposed to the top 18 a of the sink 18, and the roaster The unit 7 and the operation unit 9 are assembled so as to face the front surface part 18 b of the sink 18. Therefore, it is called a built-in type. It should be noted that the size of the sink 18 is uniform so that a gas stove can be replaced and incorporated.

  In FIG. 4 showing the AA cross section of FIG. 1, an induction heating coil unit 19 is disposed immediately below the induction heating unit 13 of the top plate 3. Below that, a cooking cabinet 20 of the roaster section 7 having a front opening for taking in and out food is provided, and a tray 20 detachably connected to the door 8 is provided at the bottom 20a of the cooking cabinet 20. 21 is stored. An upper heater 22 composed of a flat heater for heating food stored in the cooking chamber 20 is arranged on the outer wall of the upper surface 20b of the cooking chamber 20, and the cooking chamber 20 is disposed below the cooking chamber 20 and above the tray 21. A lower heater 23 made of a sheathed heater is provided so as to protrude from the rear surface 20c into the cooking cabinet 20. In addition, a grill net 24 serving as a food placing table having a flat portion 24 a for placing food on the lower heater 23 is placed in the saucer 21. The net assisting tool 25 is detachably mounted.

  In addition, the cooking chamber 20 has an opening 20d formed in the rear surface 20c thereof, and the opening 20d and the ventilation portion 4 are connected by an exhaust pipe 20e. In the exhaust cylinder 20e, a catalyst heater 20f disposed in the vicinity of the opening 20d on the cooking chamber 20 side, and a downstream side of the catalyst heater 20f are disposed. A smoke removal catalyst 20g for decomposing the smoke and odor generated from the food in the container, and the downstream of the smoke removal catalyst 20g, the smoke and odor in the cooking chamber 20 are separated from the catalyst heater 20f and the smoke removal catalyst 20g. An exhaust fan 20h that is sucked through and vented from the ventilation portion 4 is provided.

  The smoke removal catalyst 20g is composed of a platinum catalyst (noble metal catalyst), activated by heating with a catalyst heater 20f, and smoke exhausted from the vent portion 4 by low-temperature combustion, that is, oxidative decomposition of organic components. And odor can be greatly reduced. For this reason, in the home kitchen, when the ventilation fan dedicated to the built-in induction heating cooker is not used, the suction power of the general ventilation fan is small, so that the smoke cannot be sufficiently sucked, and the entire kitchen is exhausted from the ventilation section 4. It can solve the problem that the smoke and odor are diffused and the wall surface becomes dirty. In particular, recent kitchens have many open types, and smoke that has diffused into the kitchen can be prevented from flowing into the living room.

  Further, as shown in FIG. 2, the display unit 6 includes a first display unit 6a formed of one liquid crystal display element in the vicinity of the top panel frame 2, and a first display unit 6a disposed behind the first display unit 6a. 2 display section 6b. As shown in the enlarged view of FIG. 6, the state of induction heating in the induction heating units 13 and 14 is displayed on the first display unit 6a. Specifically, a mode display unit 61 that displays the current heating mode at the center, that is, heating, kettle, heat insulation, deep-fried food cooking, deep-fried food cooking with a small amount of oil, and corresponding to each mode position on the left and right of the mode display unit 61 It has mode instruction units 62 and 63 made of triangular marks. Each mode instruction unit 62, 63 displays the current operation mode of the corresponding induction heating unit 13, 14 by turning on a triangular mark (other triangular marks are turned off).

  In addition, the first display unit 6a has a setting display unit 64 that is on the upper left side of the mode instruction unit 62 and displays the current output set value of the induction heating unit 13 or the set temperature in the deep-fried food cooking mode, and the setting display. A timer time display unit 65 that displays the remaining time when the timer of the induction heating unit 13 is set in the lower stage of the unit 64, and a current output set value of the induction heating unit 14 in the upper right side of the mode instruction unit 63, or In the fried food cooking mode, it has a setting display unit 66 that displays a set temperature, and a timer time display unit 67 that is in the lower stage of the setting display unit 66 and displays the remaining time when the timer of the induction heating unit 14 is set. .

  On the other hand, on the second display section 6b, the heater setting display section 68 for displaying the driving state and set output of each heater of the radiant heater and the roaster section 7 on the side close to the first display section 6a and the automatic cooking of the roaster section 7 A menu display unit 69 is arranged. The automatic cooking menu display unit 69 is configured to display an instruction on the currently executed menu by turning on an LED or the like from below.

  FIG. 6 is a control block diagram of the built-in induction heating cooker according to the present embodiment. The induction heating control unit 30 has the induction heating coil unit 19 described above and is placed on the induction heating unit 13 printed on the top plate 3. The cooking pan placed is induction-heated, and the induction heating control unit 31 induction-heats the cooking pan placed on the induction heating unit 14 printed on the top plate 3 using an induction heating coil unit (not shown). The load detection unit 32 does not want to be heated when the cooking pans placed on the induction heating units 13 and 14 are not capable of induction heating, for example, aluminum pans, earthen pans, etc. When small objects are detected by the current flowing through the induction heating control units 30 and 31, and it is determined that heating is inappropriate, the induction heating control units 30 and 31 are stopped driving via the control unit described later.

  The radiant heater 33 is disposed below the heater heating unit 15, and the roaster heater 34 is a general term for the upper heater 22 and the lower heater 23 of the roaster unit 7. The cooling fan 35 is disposed in the main body 1, sucks air from the ventilation part 4, cools a control part and an induction heating coil part, which will be described later, and exhausts the air again from the ventilation part 4. The IH thermistor group 36 is disposed on each induction heating coil section below the top plate 3 described above, and the roaster thermistor 37 is attached to the outer side wall of the cooking cabinet 20 to detect the temperature in the cooking cabinet 20, and the substrate thermistor group. Reference numeral 38 detects a temperature on a printed board on which a control unit, which will be described later, is mounted, and temperatures of power switching elements and diode bridges used in the induction heating control units 30 and 31. The control unit 39 is composed of a microcomputer or the like, and induction heating based on instructions from the top panel operation unit 5 or the front operation unit 9 and information from the IH thermistor group 36, the roaster thermistor 37, and the substrate thermistor group 38. Drive control is performed by outputting drive instructions to the control units 30 and 31, the radiant heater 33, the roaster heater 34, the cooling fan 35, and the like. The control power supply unit 40 forms control power from commercial power and supplies it to the control unit 39.

  The power switch 12 is disposed between the control power supply unit 40 and the commercial power supply. The catalyst heater 20f, the exhaust fan 20h, the induction heating control units 30, 31, the radiant heater 33, the roaster heater 34, and the cooling fan 35 are Power is supplied to each component by branching from a power supply line between the power switch 12 and the control power supply unit 40. Therefore, when the power switch 12 is turned off, all the power supplies are turned off.

  FIG. 7 is a block diagram showing the control system according to the present invention for one heating coil in a simplified and easy-to-understand manner, on the lower surface of a ceramic top plate 3 on which a cooking pan P made of a magnetic material is placed. A heating coil 19a for inductively heating the cooking pan P is arranged. The heating coil 19a is composed of an inverter circuit that converts a commercial power source into a high-frequency power source and adjusts the heating output of the heating coil 19a through a switching element (not shown) constituting induction heating means together with the heating coil 19a. The drive is controlled by the power varying means 30a. These are included in the induction heating control units 30 and 31 shown in the control block diagram of FIG.

  A thermistor 36a corresponding to temperature detecting means for detecting the temperature of the cooking pan P through the top plate 3 is pressed in the vicinity of the approximate center of the heating coil 19a on the lower surface of the top plate 3. The temperature control means 39a and the temperature comparison means 39a are realized by a microcomputer constituting the control unit 39 of FIG. 6, and the temperature control means 39a is a temperature detected by the thermistor 36a and a set temperature set by the user. In addition to the function of driving and controlling the power varying means 30a so that the detected temperature of the thermistor 36a becomes the set temperature, the time t1, time t2, time t3, and time t4 shown in FIG. And the temperature difference (first to first) between the first elapsed time t1 and the other second to fourth elapsed times t2 to t4 (Δt1, Δt2, Δt3). 3 temperature rise values ΔT1, ΔT2, ΔT3). The temperature comparison means 39b compares the first to third temperature rise values ΔT1, ΔT2, and ΔT3 calculated by the temperature control means 39a with preset first to third pot warp detection levels, Judging whether or not the degree of warpage can continue heating, when it is determined that heating cannot be continued, the power variable means 30a is instructed to stop heating, and the degree of warping is determined to be within a range where heating can be continued. In some cases, it has a function of instructing the temperature control means 39a to lower the set temperature by a predetermined value.

  Figure 8 above shows a cooking pan with no pan warp and a small amount of oil (200g), an appropriate amount of oil (500g), an appropriate amount of oil (900g), and a pan with a pot warp [small] (0.5mm) ), Pan warp [middle] (1mm), pan warp [large] (2mm), pan warp [large] (3mm) The relationship with the detected temperature (temperature gradient) is measured and graphed. Based on these data, the first to third pan warp detection levels described above are set in advance so that a desired determination result can be obtained. can do. Here, the first to fourth elapsed times t1 to t4 from the start of heating for measuring the temperature gradient are set to t1: 2 minutes, t2: 3 minutes, t3: 4 minutes, t4: 5 minutes. doing.

  The operation according to the present invention in the above configuration will be described below based on the flowchart shown in FIG.

  When the user sets a set temperature (for example, 200 ° C.), selects and executes a fried food cooking course, and fried food cooking is started, first waits for time t1 to elapse in step S1. The temperature detected by the thermistor 36a is stored in the temperature control means 39a. Further, after waiting for the time t2 to pass in step S2, the temperature detected by the thermistor 36a is stored in the temperature control means 39a when the time elapses. In step S3, the temperature comparison unit 39b calculates a temperature difference (first temperature increase value ΔT1) between the detected temperature T1 at time t1 and the detected temperature T2 at time t2.

  In the next step S4, the temperature comparison means 39b compares the first temperature rise value ΔT1 calculated in step S3 with a first pan warp detection level set in advance, and determines whether or not it is equal to or higher than the detection level. To do. When it is determined in step S4 that the level is not equal to or higher than the first pan warp detection level, the process proceeds to step S5. In this step S5, a heating stop instruction is output from the temperature comparison means 39b to the power varying means 30a to stop heating and prevent abnormal heating. Here, by setting the first pan warp detection level between, for example, pan warp [large] (2 mm) and pan warp [large] (3 mm) in FIG. 8, the pan warp [large] (3 mm) is set. When a pan is used, it is possible to stop the heating operation with certainty that the pan has a large warp and may cause abnormal heating.

  On the other hand, when it is determined in step S4 that the first temperature rise value ΔT1 is equal to or higher than the first pan warp detection level, the process proceeds to step S6. In this step S6, after the time t3 has elapsed, the temperature detected by the thermistor 36a is stored in the temperature control means 39a when the time t3 elapses. In step S7, the temperature comparison unit 39b calculates a temperature difference (second temperature increase value ΔT2) between the detected temperature T1 at time t1 and the detected temperature T3 at time t3.

  In the next step S8, the temperature comparison means 39b compares the second temperature rise value ΔT2 calculated in step S7 with a preset second pan warp detection level to determine whether or not it is equal to or higher than the detection level. To do. When it is determined in step S8 that the level is not equal to or higher than the second pan warp detection level, the process proceeds to step S9. In step S9, the temperature comparison means 39b instructs the temperature control means 39a to lower the set temperature by a predetermined value, and the heating control by the temperature control means 39a is continued. Here, by setting the second pan warp detection level between, for example, pan warp [large] (2 mm) and an appropriate amount of oil (900 g) at time t <b> 3 in FIG. 8, pan warp [large] (2 mm) When the pan is used, it is judged that there is a pan warp but is in a controllable range, and the set temperature is lowered from, for example, 200 ° C. to 150 ° C., and the heating control is continued while preventing abnormal heating. In addition, since the set temperature cannot be lowered even if the oil amount is appropriate (900 g) if there is no pan warp, cooking at a low oil temperature can be prevented from causing a cooking failure.

  On the other hand, when it is determined in step S8 that the second temperature rise value ΔT2 is equal to or higher than the second pan warp detection level, the process proceeds to step S10. In this step S10, after the time t4 elapses, the temperature detected by the thermistor 36a is stored in the temperature control means 39a when the time t4 elapses. In step S11, the temperature comparison unit 39b calculates a temperature difference (third temperature increase value ΔT3) between the detected temperature T1 at time t1 and the detected temperature T4 at time t4.

  In the next step S12, the temperature comparison means 39b compares the third temperature rise value ΔT3 calculated in step S11 with a preset third pan warp detection level, and determines whether or not it is equal to or higher than the detection level. To do. When it is determined in step S12 that the level is not equal to or higher than the third pan warp detection level, the process proceeds to step S13. In step S13, the temperature comparison means 39b instructs the temperature control means 39a to lower the set temperature by a predetermined value, and the heating control by the temperature control means 39a is continued. Here, the third pan warp detection level is, for example, between the pan warp [large] (2 mm) and the appropriate amount of oil (900 g) at time t4 in FIG. By setting the smaller one, when a pan with a warpage of about 1.5mm smaller than the above is used, it is judged that there is a pan warp but it can be controlled and the set temperature is increased from 200 ° C to higher than the above, for example Heat control is continued while lowering to 180 ° C. to prevent abnormal heating. Thereby, it becomes possible to detect the warping of the pot more finely and reflect it in the control. Also, in this case, the set temperature cannot be lowered even if the oil amount is appropriate (900 g) if there is no pan warp, so that cooking at a low oil temperature can be prevented from causing a cooking failure. .

  If it is determined in step S12 that the third temperature rise value ΔT3 is greater than or equal to the third pan warp detection level, the process proceeds to step S14. In this step S14, the normal operation of deep-fried food cooking is continuously executed without detecting the pot warp.

  In the above steps, when the fried food cooking course is executed and the user stops fried food cooking, the cooking pan P is moved to a position off the heating coil 19a or turned off by turning off the power. You can stop.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the content of said Example, A various change is possible within the range of a claim description. For example, in the above embodiment, the three-stage pan warp detection is performed, but the initial object of the present invention can be achieved even in two stages, and if the pan warp detection is performed beyond three stages, the pan warp is detected more finely. Can be reflected in the control.

  Moreover, although the said Example demonstrated the case where this invention was applied to control of deep-fried food cooking, even if it applies to control other than deep-fried food cooking, a fixed effect can be anticipated.

It is an external appearance perspective view of the built-in induction heating cooking appliance which is one Example of this invention. It is a top view of the built-in induction heating cooking device of FIG. It is an external appearance perspective view at the time of incorporating a built-in induction heating cooking appliance in a household sink. It is AA sectional drawing in FIG. It is an enlarged view of the display part in FIG. 1, FIG. It is a control block diagram of the built-in induction heating cooking appliance of a present Example. It is the block diagram which simplified and showed clearly the control system which concerns on this invention with respect to one heating coil. It is a figure which shows the relationship between the elapsed time from a heating start, and the detection temperature of a thermistor. It is a flowchart which shows the example of control in a present Example.

Explanation of symbols

3 Top plate
DESCRIPTION OF SYMBOLS 19 Induction heating coil part 19a Heating coil 30,31 Induction heating control part 30a Electric power variable means 36 IH thermistor group 36a Thermistor (temperature detection means)
39 Control part 39a Temperature control means 39b Temperature comparison means P Cooking pan

Claims (3)

Induction heating means including a heating coil and a switching element arranged under the top plate on which the cooking pan is placed;
Power variable means for driving and controlling the induction heating means;
A temperature detecting means for detecting the temperature of the cooking pan disposed under the top plate;
Instructing the electric power variable means to perform drive control based on the comparison result between the detected temperature of the temperature detecting means and the set temperature, and calculating the rise value of the detected temperature of the temperature detecting means,
Comparing the rise value of the detected temperature calculated by the temperature control means with a preset pan warp detection level, and outputting a drive control instruction based on the comparison result to the power variable means or the temperature control means Means and
The temperature comparing means is preset with the first temperature rise value when the temperature control means calculates a first temperature rise value between the first elapsed time and the second elapsed time from the start of heating. If the first temperature rise value is smaller than the first pan warp detection level, an instruction to stop the heating operation is output to the electric power variable means, and the temperature control means outputs the first elapsed time. When the second temperature rise value between the first elapsed time and the third elapsed time longer than the second elapsed time is calculated, the second temperature rise value is compared with a preset second pan warp detection level. Then, if the second temperature rise value is smaller, the temperature control means is instructed to lower the set temperature by a predetermined value.   The temperature comparison means calculates the third temperature when the temperature control means calculates a third temperature rise value between the first elapsed time and a fourth elapsed time longer than the third elapsed time. Comparing the increased value with a preset third pan warp detection level, if the third temperature increased value is smaller, the temperature control means is instructed to decrease the set temperature by a predetermined value. The induction heating cooker according to claim 1. The induction heating cooker according to claim 1 or 2, wherein the control is applied to control of deep-fried food cooking.

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