JP5052476B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker, and more particularly to temperature control of an induction heating cooker.

Conventionally, a plurality of temperature detection elements having different sensitivities are provided on the back surface of the top plate on which the cooking utensils are placed, and the control circuit generates a high frequency generated from the induction heating coil based on a signal from any one of these temperature detection elements. An induction heating cooker is known that adjusts the temperature of a cooking utensil that is induction heated by controlling a magnetic field (see, for example, Patent Document 1).
Moreover, on the top plate of the induction heating cooker, a coupling coil that is electromagnetically coupled to the heating coil, a heater connected to the coupling coil, a radiant heat transmission plate that transmits the radiant heat of the heater, and a net body on which the food is placed are provided. A pottery cooker is placed, and an induced electromotive force generated in the coupling coil by the high frequency magnetic field from the heating coil is supplied to the heater. The heater is made of nichrome wire, reaches a temperature of about 800 ° C., becomes red hot, and is transmitted upward as radiant heat. The radiant heat transmission plate efficiently transmits the radiant heat and heats the food on the net. As a result, a technique for cooking pottery by grilling is known (see, for example, Patent Document 2).

JP-A-63-152197 (first page, FIG. 1) JP-A-11-204243 (page 3, FIG. 1)

However, in the conventional induction heating cooker shown in the above-mentioned Patent Document 1, it is necessary to detect the temperature of the object to be heated in various cooking states, so the measurement temperature range of the temperature detection element is about 20 to 300 ° C. wide. Therefore, for example, when performing temperature control targeting a specific temperature range such as a boiling temperature range (85 to 105 ° C.) or a tempura cooking temperature range (160 to 200 ° C.), the resolution of the temperature detection element is insufficient. Therefore, there is a problem that overshoot or hunting with respect to the target temperature occurs.
Moreover, in the conventional induction heating cooker shown by the said patent document 2, although it is suitable for high-temperature cookings, such as abalone cooking, for the heat transfer heating by a resistance heating system, it is related with the cooking performed by mounting a pan. Has a problem that the efficiency is low and the input heating power is small compared to the induction heating method.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain an induction heating cooker capable of measuring temperature with high accuracy.

An induction heating cooker according to the present invention includes a top plate on which an object to be cooked is placed, a heating coil disposed below the top plate, and a first temperature detection element that measures the temperature of the object to be cooked. The predetermined temperature range of the detection temperature range is narrower and higher resolution than the first temperature detection element, and the detected temperature range is higher in accuracy than the first temperature detection element in the predetermined temperature range. A second temperature detection element that measures the temperature of the food, and a control unit; and when the control unit determines that the predetermined temperature range is present based on a detection value of the first temperature detection element; The measuring means is switched from the first temperature detection element to the second temperature detection element.

According to the present invention, the top plate on which the object to be cooked is placed, the heating coil disposed below the top plate, the first temperature detecting element for measuring the temperature of the object to be cooked, and the first The predetermined temperature zone in the detection temperature range is narrower and has higher resolution than the first temperature detection element, and the temperature of the object to be cooked is higher than that of the first temperature detection element. A second temperature detection element that measures the temperature, and a control unit. When the control unit determines that the temperature is within the predetermined temperature range based on a detection value of the first temperature detection element, Since the first temperature detection element is switched to the second temperature detection element, the temperature detection accuracy near the target temperature is improved, so that highly accurate temperature control is possible.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of an induction heating cooker according to the present invention.
As shown in FIG. 1, the induction heating cooker has a main body 1 of the heating cooker and a heat resistance on which an upper surface of the main body 1 and an object to be heated (hereinafter sometimes referred to as a pan) 2 such as a pan are placed. It consists of a glass top plate 3. Further, the top plate 3 is provided with a thermal power setting unit 4 for setting the strength of the thermal power in the heating unit, a thermal power display unit, and the like. The main body 1 also has a grill 5 suitable for grilling fish and meat, and a plurality of rotary buttons and display units so that conditions such as heating power, cooking time, temperature, etc. can be set and displayed for the heating unit and the grill 5 etc. A front operation unit 6 provided, a heating coil (not shown) that is provided below the top plate 3 and constitutes the substance of the heating unit, and a temperature sensor (not shown) that measures the temperature of the object 2 to be heated. I have.

FIG. 2 is a temperature characteristic diagram showing the relationship between the temperature and resistance value of a plurality of types of thermistors having different temperature characteristics, showing the first embodiment of the induction heating cooker according to the present invention. FIG. 3 is an enlarged view of a main part showing the arrangement positions of the plural types of thermistors shown in FIG. 2, and shows an example in which the thermistors are arranged in the center of the heating coil. FIG. 4 is a diagram showing the three types of thermistors and peripheral circuits shown in FIG. Moreover, FIG. 5 is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 1 of this invention. As shown in FIG. 5, the thermistor 11, the boiling cooking thermistor 12, the tempura cooking thermistor 13, the control unit 21, the memory 22, and the display unit 25 are connected to the IO bus 31. The heating coil 24 is connected to the control unit 21 via an inverter 23 that drives the heating coil 24.
Next, the first embodiment will be described with reference to FIGS.
As shown in FIG. 2, the normal cooking thermistor 11 exhibits a relatively low resolution in a wide temperature range of about 50 ° C. to 300 ° C., whereas the boiling cooking thermistor 12 is remarkable in the range of 80 ° C. to 120 ° C. It shows temperature characteristics, and shows a sensitivity (that is, high resolution) about 10 times higher than that of the normal cooking thermistor 11 in a temperature range of 90 ° C. to 110 ° C. for boiling water cooking. Further, the tempura cooking thermistor 13 exhibits remarkable temperature characteristics in the range of 120 ° C. to 220 ° C., and exhibits a considerably higher resolution than the normal cooking thermistor 11 in the temperature range of 160 ° C. to 200 ° C. for tempura cooking.
As shown in FIG. 3, in addition to the normal cooking thermistor (wide temperature range / low resolution) 11 for detecting the pan temperature in conventional normal cooking, the thermistors 12 and 13 having high detection sensitivity in a specific temperature range are heated. Each of the coils 24 is disposed at the center.
Also, as shown in FIG. 4, a reference voltage is applied to the conventional thermistor 11, the boiling thermistor 12 and the tempura cooking thermistor 13 through the corresponding resistors 111, 121 and 131, respectively, and the reference is determined by the resistance and the resistance of the thermistor. A voltage value obtained by dividing the voltage is output from each thermistor and sent to the control unit 21 as an analog voltage signal. Since the resistance value of the thermistor changes according to the ambient temperature detected by the thermistor, the analog voltage signal changes.
Further, the target heating temperature corresponding to the cooking mode is stored in the memory 22 in advance. And when boiling cooking or tempura cooking is selected by a user's operation, the control part 21 will acquire the target heating temperature corresponding to the selected cooking mode from the memory 22, and it will become this target heating temperature. The inverter 23 is driven at high frequency, and the pan 2 placed on the top 3 is heated.
As a result, the inverter 23 supplies electric power (heating power) to the heating coil 24 so as to follow the target heating temperature to drive the heating coil 24 by induction heating. Moreover, the control part 21 outputs the information of a heating condition to the display part 25 so that a heating condition (thermal power, the present temperature, the kind of cooking etc.) may be displayed as needed.
When the heating is started, the control unit 21 periodically monitors the voltage value detected by the normal cooking thermistor 11, converts the cooking temperature from this voltage value, and detects the temperature of the pan 2. When the boiling cooking temperature zone is entered, the monitoring destination is switched from the normal cooking thermistor 11 to the boiling cooking thermistor 12, and high-precision temperature control according to the detection sensitivity of the thermistor 12 is performed.
Even when the cooking temperature converted from the voltage value detected by the normal cooking thermistor 11 enters the tempura cooking temperature range, the same operation as described above is performed.
In addition, as a conversion method of cooking temperature, you may use a well-known numerical formula, the table which matched the analog voltage value and cooking temperature for every kind of thermistor in advance in the memory 22 is stored, and the thermistor The table may be searched using the type and analog voltage value as a search key to obtain the cooking temperature.

In the above example, the case where three types of thermistors having different temperature characteristics are arranged has been described. However, the present invention is not limited to this, and four or five types may be used. That is, a thermistor having a temperature characteristic suitable for each of a plurality of types of cooking to be used may be disposed.
In the above example, a high-precision thermistor of a different type from the normal cooking thermistor is disposed in the center of the heating coil. However, if there is only one cooking mode, the resolution is high in the cooking temperature range. Only the precision thermistor may be placed in the center of the heating coil together with the normal cooking thermistor. Thereby, the number of parts can be reduced without impairing highly accurate temperature control in the above cooking.
Further, the control unit 21 compares the temperature detected by the thermistor 11 with the temperatures at substantially the same position simultaneously detected by the boiling cooking thermistor 12 or the tempura cooking thermistor 13, and the difference is a predetermined value (this The value is a value obtained by adding a margin to a detection sensitivity error that changes in accordance with the temperature of each thermistor obtained from the graph shown in FIG. 2, and is stored in advance in the memory 22 as a set value.) It is judged that one of them has failed, and an alarm is output. As a result, the user can take quick measures such as repairing a failure, and as a result, it is possible to prevent erroneous detection due to failure, and hence erroneous control. In this case, when only one of the three types of thermistors is largely off, there is a high possibility that the thermistor has failed, and the failure sensor can be easily identified.

  As described above, according to the present embodiment, the above configuration improves the temperature detection resolution in the vicinity of the target temperature in each cooking mode (tempura 180 ° C., boiling water 100 ° C.), thereby enabling highly accurate temperature control. It becomes possible. Furthermore, since the failure detection of the temperature sensor is also performed, it becomes possible to maintain highly accurate temperature detection and highly accurate temperature control continuously for a long period of time.

Embodiment 2. FIG.
In the first embodiment, the case where the temperature is measured using the high-resolution thermistor that is a contact sensor has been described. However, the temperature can be measured using a non-contact high-resolution sensor. In this embodiment, a case where an infrared sensor is used as the non-contact type high resolution sensor will be described.
FIG. 1 is also used in this embodiment. FIG. 6 is a diagram showing an arrangement position of a non-contact sensor (infrared sensor) in Embodiment 2 of the present invention. Moreover, FIG. 7 is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 2 of this invention. As shown in FIG. 7, a high-resolution infrared sensor 14 that is a non-contact sensor is connected to the IO bus 31.
Next, the present embodiment will be described with reference to FIGS.
As shown in FIG. 6, in addition to disposing a conventional normal cooking thermistor (wide temperature range / low resolution) 11 at the center of the heating coil 24 below the top plate 3, the heating coil is also provided below the top plate 3 and below. A non-contact temperature sensor (for example, a thermopile or the like) having high detection sensitivity with respect to a specific temperature region at a position on the top plate 3 that can be monitored at least above the temperature of the heating coil. The infrared sensor 14) is used in combination. The control unit 21 can acquire the temperature distribution of the entire bottom of the object to be heated 2 such as a pan by the signal detected by the infrared sensor 14. Based on this and the temperature information acquired from the conventional normal cooking thermistor 11, it is calculated which part of the bottom is warped.
The reason for disposing the heater coil 24 away from the heating coil 24 is to avoid the influence of noise caused by the heat generated from the heating coil 24.
Further, the control unit 21 compares the temperature detected by the thermistor 11 with the temperature at the same position simultaneously detected by the infrared sensor 14, and the difference is a predetermined value (this value is obtained from the graph shown in FIG. 2). (The value is obtained by adding a margin to the error in detection sensitivity that changes according to the temperature of the thermistor, and is stored in advance in the memory 22 as a set value.) I do. As a result, the user can take quick measures such as repairing a failure, and as a result, it is possible to prevent erroneous detection due to failure, and hence erroneous control.

  According to the present embodiment, in addition to improving the temperature detection resolution in the vicinity of the target temperature according to the above configuration, the object to be heated (such as a pan) even when a warp pan or the like is placed and temperature detection cannot be performed by a contact type ) Temperature can be detected. Furthermore, since the failure detection of the temperature sensor is also performed, it becomes possible to maintain highly accurate temperature detection and highly accurate temperature control continuously for a long period of time.

Embodiment 3 FIG.
In the present embodiment, a case will be described in which a thermistor is disposed in a heating coil (double ring coil or triple ring coil) having a plurality of different diameters.
1 and 5 are also used in this embodiment. FIG. 8 is a temperature characteristic diagram showing the relationship between temperatures and output voltages of a plurality of types of thermistors having different temperature characteristics in the third embodiment of the induction heating cooker according to the present invention. As shown in FIG. 8, the thermistor for normal cooking shows a relatively low resolution in a wide temperature range of about 50 ° C. to 300 ° C., whereas the thermistor for boiling cooking has remarkable temperature characteristics in the range of 80 ° C. to 120 ° C. In the temperature range of 90 ° C. to 110 ° C. for boiling cooking, the sensitivity is about 10 times higher than that of a normal cooking thermistor (ie, high resolution). Moreover, the tempura cooking thermistor exhibits remarkable temperature characteristics in the range of 120 ° C. to 220 ° C., and exhibits a considerably higher resolution than the normal cooking thermistor in the temperature range of 160 ° C. to 200 ° C. for tempura cooking.
FIG. 9 is an enlarged view of a main part showing the arrangement positions of the plurality of types of thermistors shown in FIG. 8, and FIG. 9A shows a thermistor between the heating coils of three heating coils (triple ring coils) having different diameters. FIG. 9B shows an example in which the thermistor is arranged between the heating coils of two heating coils (double ring coils) having different diameters. Although not shown, two inverters are provided per double ring coil, and three inverters are provided per triple ring coil. As shown in FIG. 9, in addition to a conventional pan temperature thermistor (wide temperature range / low resolution) 11, a thermistor having a high detection sensitivity for a specific temperature region is provided. 9A, a conventional pan temperature thermistor 11, a boiling cooking thermistor 12, and a tempura cooking thermistor 13 are disposed between the innermost coil and the intermediate coil, respectively. Then, the conventional pan temperature thermistor 11, boiling cooking thermistor 12, and tempura cooking thermistor 13 are respectively disposed between the outermost coil and the intermediate coil.
Next, the operation will be described. A description of the same parts as those in the first embodiment will be omitted, and different parts will be described.
When the temperature is measured in the vicinity of the target temperature, the control unit 21 controls the corresponding inverter 23 to stop driving the coil inside the thermistor in the double ring coil or the triple ring coil.
Thereby, compared with the case where it arrange | positions at the heating coil center part, the noise by the influence of the heat and magnetic field which generate | occur | produce from the coil in the vicinity of target temperature reduces, and a temperature detection system improves.
In the above example, the case where three types of thermistors having different temperature characteristics are arranged has been described. However, the present invention is not limited to this, and four or five types may be used. That is, a thermistor having a temperature characteristic suitable for each of a plurality of types of cooking to be used may be disposed.

  According to the present embodiment, compared to the case where the heating coil is arranged at the center of the heating coil by the above configuration, noise due to the influence of heat and magnetic field generated from the coil at the center can be reduced. Temperature detection accuracy is improved.

Embodiment 4 FIG.
In this embodiment, there are a plurality of thermistors with high detection sensitivity for a specific temperature region, the detection temperature ranges of the thermistors are overlapped, and the detection values of the sensor with high resolution in each temperature range are used. explain.
FIG. 1 is also used in this embodiment. FIG. 10 is a temperature characteristic diagram showing the relationship between the temperature and the output voltage of a plurality of types of thermistors having different temperature characteristics showing the fourth embodiment of the induction heating cooker according to the present invention. FIG. 11 is an enlarged view of a main part showing the arrangement positions of the plurality of types of thermistors shown in FIG. 10, and shows an example in which the thermistors are arranged in the center of the heating coil. Moreover, FIG. 12 is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 4 of this invention. As shown in FIG. 12, a first thermistor 15 having a high resolution in the temperature zone A to B and a second thermistor 16 having a high resolution in the temperature zone C to D near the temperature zone A to B are provided. It is connected to the IO bus 31.
Next, the present embodiment will be described with reference to FIGS.
FIG. 10 shows a case where the temperature band of A to B and the temperature band of C to D are quite close or partially overlap, and the first thermistor 15 has a high resolution in the temperature band of A to B. The second thermistor 16 has a high resolution in the temperature range C to D.
The control unit 21 periodically monitors the voltage value detected by the normal cooking thermistor 11, converts the cooking temperature from this voltage value, and enters the temperature range of A to B, the monitoring destination is selected. The normal cooking thermistor 11 is switched to the first thermistor 15, and the voltage value from the first thermistor 15 is monitored and converted into the cooking temperature. Thereby, since the temperature measurement in the temperature range of A to B is performed with high accuracy, the cooking temperature can be controlled with high accuracy. When the temperature zone enters the temperature zone C to D, the monitoring destination is switched from the first thermistor 15 to the second thermistor 16, and the voltage value from the second thermistor 16 is monitored to prepare the cooking temperature. Convert to. Thereby, since the temperature measurement in the temperature range of C to D is performed with high accuracy, the cooking temperature can also be controlled with high accuracy. As described above, the cooking temperature can be controlled with high accuracy in the substantially continuous temperature regions A to B and C to D.

  According to the present embodiment, a plurality of thermistors having high detection sensitivity in a specific temperature region as described above are provided, and the detection temperature ranges of the respective thermistors are overlapped, so that a sensor with high resolution in each temperature zone can be obtained. Since the temperature detection resolution can be improved by using the detection value, the temperature can be quickly raised to the vicinity of the target temperature, and the temperature can be controlled with high accuracy over a wide target temperature range.

Embodiment 5 FIG.
In the above embodiment, it is assumed that the temperature detection cycle is the same in any temperature range. However, the temperature detection cycle may be changed to be different between the normal cooking temperature zone and the specific temperature zone. This embodiment will be described in this embodiment.
Since the normal cooking sensor 11 having a relatively low resolution is used in the normal cooking temperature range, there is no problem even if relatively rough monitoring and control are performed. Therefore, the control means performs temperature detection at a predetermined cycle until the predetermined temperature zone is reached, and performs temperature control based on the detected temperature. In addition, in the case of cooking that requires delicate temperature control, it may be uncomfortable if cooking is performed in the same manner as in the case of normal cooking in the temperature detection cycle in this cooking temperature zone. Therefore, in such a case, when the control unit 21 detects that the cooking temperature range has been entered, the control unit 21 switches to a sensor having high sensitivity in this temperature range and controls the temperature detection cycle to be shorter. Thus, the temperature can be managed with fine timing, and the inverter is driven according to the timing. As a result, even in the case of cooking that requires delicate temperature control, fine temperature control becomes possible.

Embodiment 6 FIG.
This Embodiment demonstrates the case where the pan (small pan) below a specific diameter is detected.
Next, this embodiment will be described.
The control unit 21 includes a pan determination unit as a function. When a pan (small pan) having a specific diameter or less is detected by the pan determination unit, temperature control is performed using a thermistor having high detection sensitivity for a specific temperature region. Do.
Thereby, since the temperature change with respect to input electric power becomes comparatively large with the small pan with a small heat capacity, the overshoot with respect to target temperature can be suppressed by using a thermistor with high detection sensitivity.

Embodiment 7 FIG.
In addition, the control part 21 controls using the detected value of the conventional pan temperature thermistor (wide temperature range, low resolution) 11 to the vicinity of the target temperature away from the target temperature by a predetermined value, and near the target temperature. Then, it may be configured to control using a detection value of a thermistor having high detection sensitivity for a specific temperature region.
As a result, when there is a large deviation from the target temperature, the detection temperature system is not required. Therefore, by using a conventional thermistor to detect the temperature (expand the sampling time interval), the time to reach the target temperature is reduced. Highly accurate temperature control can be performed with respect to the cooking target temperature.

Embodiment 8 FIG.
In the present embodiment, the description will be given on the cooking of the fish.
FIG. 1 is also used in this embodiment.
FIG. 13 is a temperature zone and conceptual diagram when performing brown cooking in the eighth embodiment of the present invention, and FIG. 13 (a) is a diagram showing the temperature characteristics of the thermistor for brown cooking. It is shown in contrast with temperature characteristics. Moreover, FIG.13 (b) is a conceptual diagram which shows the mode in the case of performing an umami cooking. In FIG. 13 (b), reference numeral 15 denotes a brown cooking thermistor that is used for cooking brown and has a high resolution. Moreover, FIG. 14 is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 7 of this invention. As shown in FIG. 14, the normal cooking thermistor 11 and the brown cooking thermistor 15 are connected to the IO bus 31.
Next, this embodiment will be described.
As shown in FIG. 13A, the metal placed on the top plate 3 by using the metal plate 30 in combination with the thermistor 15 (300 to 400 ° C.) for detecting the high temperature in the temperature range for cooking. The plate can be cooked with high accuracy and high temperature control.
The controller 21 can reduce the time required to reach the temperature range for the cooking by performing rough temperature detection and temperature control using the normal cooking thermistor 11 until the temperature range for the cooking is reached. Further, when reaching the temperature range for cooking the abalone, the temperature is switched to the thermistor 15 for cooking the abdomen and temperature detection and temperature control are performed. As a result, the temperature control for the cooking can be realized with high accuracy.
As described above, by using a thermistor with high detection sensitivity in the cooking temperature zone and a metal plate as described above, the metal plate placed on the top plate is controlled at high temperature with high accuracy, and cooking is done conventionally. It is possible to heat non-metal pots (earthen pots) that cannot be used with IH cookers, and to cook brown fish such as dried fish and seaweed.

It is a figure which shows the structure of the induction heating cooking appliance which concerns on this invention. It is a temperature characteristic figure which shows the relationship between the temperature and resistance value of several types of thermistor from which the temperature characteristic which shows Embodiment 1 of the induction heating cooking appliance which concerns on this invention differs. It is a principal part enlarged view which shows the arrangement position of multiple types of thermistor shown in FIG. FIG. 4 is a diagram showing three types of thermistors and peripheral circuits shown in FIG. 3. It is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 1 and Embodiment 3 of this invention. It is a figure which shows the arrangement position of the non-contact sensor (infrared sensor) in Embodiment 2 of this invention. It is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 2 of this invention. It is a temperature characteristic figure which shows the relationship between the temperature of several types of thermistor from which the temperature characteristic differs in Embodiment 3 of the induction heating cooking appliance which concerns on this invention, and an output voltage. It is a principal part enlarged view which shows the arrangement position of multiple types of thermistor shown in FIG. It is a temperature characteristic figure which shows the relationship between the temperature of several types of thermistor from which the temperature characteristic differs, and output voltage which show Embodiment 4 of the induction heating cooking appliance which concerns on this invention. It is a principal part enlarged view which shows the arrangement position of multiple types of thermistor shown in FIG. It is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 4 of this invention. It is a temperature zone and a conceptual diagram in the case of performing the rice cooking in Embodiment 8 of this invention. It is a block diagram which shows the structure of the induction heating cooking appliance in Embodiment 8 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body, 2 To-be-heated object (pan), 3 Top plate, 4 Thermal power setting part, 5 Grill, 6 Front operation part, 11 Thermistor for normal cooking, 12 Thermistor for boiling cooking, 13 Thermistor for tempura cooking, 14 Infrared sensor, 15 First Thermistor, 16 Second Thermistor, 17 Cooked Thermistor, 21 Control Unit, 22 Memory, 23 Inverter, 24 Heating Coil, 25 Display Unit, 30 Metal Plate, 31 IO Bus, 111 Resistance, 121 Resistance, 131 resistance.

Claims (15)

A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
The predetermined temperature zone in the detected temperature range is narrower and has a higher resolution than the first temperature detection element, and the cooking target is more accurate than the first temperature detection element in the predetermined temperature zone. A second temperature detecting element for measuring the temperature of the object;
A control unit,
When the control unit determines that the temperature is in the predetermined temperature range based on the detection value of the first temperature detection element, the control unit switches the measurement unit from the first temperature detection element to the second temperature detection element. Induction heating cooker featuring. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
Relative to the first temperature sensing element, narrow predetermined temperature range of the detection temperature range, a higher resolution, provided corresponding to the plurality of the predetermined temperature range, in the predetermined temperature range A plurality of second temperature detection elements that measure the temperature of the object to be cooked with higher accuracy than the first temperature detection element;
A control unit,
When the control unit determines that the temperature is in any one of the plurality of the predetermined temperature zones based on the detection value of the first temperature detection element, the measurement unit is determined from the first temperature detection element. The induction heating cooker characterized by switching to the 2nd temperature detection element corresponding to the temperature range to perform.   The induction heating cooker according to claim 1 or 2, wherein the first temperature detection element and the second temperature detection element are arranged in the center of the heating coil. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A second temperature detection element that measures the temperature of the object to be cooked with higher accuracy than the first temperature detection element in a predetermined temperature range;
A control unit that switches the measurement means from the first temperature detection element to the second temperature detection element when it is determined that the temperature is in the predetermined temperature range based on the detection value of the first temperature detection element. ,
The heating coils have the same center and are composed of a plurality of heating coils having different diameters on the same plane concentrically,
The first temperature detection element and the second temperature detection element are arranged outside a coil having the smallest diameter, and when the measurement is performed, the control unit performs the first temperature detection element and the second temperature detection element. An induction heating cooker characterized by stopping energization of a coil inside the element. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A plurality of second temperature detection elements which are provided corresponding to a plurality of temperature zones and measure the temperature of the object to be cooked with higher accuracy than the first temperature detection elements in the temperature zones;
If it is determined that the temperature is in any one of the plurality of temperature zones based on the detection value of the first temperature detection element, the measurement means is configured to correspond to the temperature zone corresponding to the corresponding temperature zone from the first temperature detection element. A control unit that switches to two temperature detection elements,
The heating coils have the same center and are composed of a plurality of heating coils having different diameters on the same plane concentrically,
The first temperature detection element and the second temperature detection element are arranged outside a coil having the smallest diameter, and when the measurement is performed, the control unit performs the first temperature detection element and the second temperature detection element. An induction heating cooker characterized by stopping energization of a coil inside the element. The second temperature detecting element is a non-contact temperature detecting element;
2. The induction heating cooking according to claim 1, wherein the induction heating cooking is arranged at a position where the temperature of the upper part of the top plate, the outside of the outer periphery of the heating coil, and the upper part of the heating plate can be monitored. vessel.   The induction heating cooking according to any one of claims 1 to 6, wherein a detection temperature zone of the first temperature detection element and a detection temperature zone of the second temperature detection element are close to each other or partially overlap. vessel. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A second temperature detection element that measures the temperature of the object to be cooked with higher accuracy than the first temperature detection element in a predetermined temperature range;
A control unit,
When the control unit determines that the temperature is in the predetermined temperature range based on the detection value of the first temperature detection element, the measurement unit is switched from the first temperature detection element to the second temperature detection element,
An induction heating cooker characterized by controlling a detection cycle of an output of the second temperature detection element to be shorter than a detection cycle of an output of the first temperature detection element. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A plurality of second temperature detection elements which are provided corresponding to a plurality of temperature zones and measure the temperature of the object to be cooked with higher accuracy than the first temperature detection elements in the temperature zones;
If it is determined that the temperature is in any one of the plurality of temperature zones based on the detection value of the first temperature detection element, the measurement means is configured to correspond to the temperature zone corresponding to the corresponding temperature zone from the first temperature detection element. A control unit that switches to two temperature detection elements,
The said control part controls the detection period of the output of a said 2nd temperature detection element shorter than the detection period of the output of a said 1st temperature detection element, The induction heating cooking appliance characterized by the above-mentioned. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A second temperature detection element that measures the temperature of the object to be cooked with higher accuracy than the first temperature detection element in a predetermined temperature range;
A control unit that switches the measurement means from the first temperature detection element to the second temperature detection element when it is determined that the temperature is in the predetermined temperature range based on the detection value of the first temperature detection element. ,
The control unit includes a pan determination unit,
An induction heating cooker characterized by performing temperature control using the second temperature detecting element when the pan determining unit detects a pan having a specific diameter or less. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A plurality of second temperature detection elements which are provided corresponding to a plurality of temperature zones and measure the temperature of the object to be cooked with higher accuracy than the first temperature detection elements in the temperature zones;
If it is determined that the temperature is in any one of the plurality of temperature zones based on the detection value of the first temperature detection element, the measurement means is configured to correspond to the temperature zone corresponding to the corresponding temperature zone from the first temperature detection element. A control unit that switches to two temperature detection elements,
The control unit includes a pan determination unit,
An induction heating cooker characterized by performing temperature control using the second temperature detecting element when the pan determining unit detects a pan having a specific diameter or less.   The control unit controls using the first temperature detection element until it reaches the vicinity of the target temperature, and when the vicinity of the target temperature that is a predetermined value away from the target temperature is reached, the second temperature detection element is It controls using, The induction heating cooking appliance in any one of Claims 1-11 characterized by the above-mentioned. Comprising a metal plate placed on the top plate,
The controller is
Controlling the heating coil based on the output of the second temperature detection element, the temperature detection element for detecting the high temperature in the temperature range for cooking the high temperature,
Until reaching the temperature range for cooking, perform temperature detection and temperature control using the first temperature detection element,
The induction heating cooker according to any one of claims 1 to 12, wherein when the temperature reaches the temperature range for cooking, the temperature is detected and controlled by switching to the temperature detection element for cooking. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A second temperature detection element that measures the temperature of the object to be cooked with higher accuracy than the first temperature detection element in a predetermined temperature range;
A control unit,
When the control unit determines that the temperature is in the predetermined temperature range based on the detection value of the first temperature detection element, the measurement unit is switched from the first temperature detection element to the second temperature detection element,
The temperature detected by the first temperature detection element is compared with the temperature at the same position detected simultaneously by the second temperature detection element, and if the difference is equal to or greater than a predetermined value, one of them is faulty. An induction heating cooker characterized in that it determines that it has been performed and outputs an alarm. A top plate for placing the food to be cooked;
A heating coil disposed below the top plate;
A first temperature detecting element for measuring the temperature of the cooking object;
A plurality of second temperature detection elements which are provided corresponding to a plurality of temperature zones and measure the temperature of the object to be cooked with higher accuracy than the first temperature detection elements in the temperature zones;
A control unit,
When the control unit determines that the temperature is in any one of the plurality of temperature zones based on the detection value of the first temperature detection element, the control unit detects the temperature zone from the first temperature detection element. Switch to the second temperature detection element corresponding to
The temperature detected by the first temperature detection element is compared with the temperature at the same position detected simultaneously by the second temperature detection element, and if the difference is equal to or greater than a predetermined value, one of them is faulty. An induction heating cooker characterized in that it determines that it has been performed and outputs an alarm.

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