JP4311413B2 - Induction heating device - Google Patents

Description

  The present invention relates to an induction heating device used in general homes, offices, restaurants and the like.

  Conventionally, as shown in FIG. 4, this type of induction heating apparatus includes a top plate 2 on which a cooking vessel 1 is placed, a heating coil 3 disposed below the top plate 2, and a cooking vessel 1. Infrared sensor 4 arranged facing the bottom, temperature detecting means 5 for converting the received light energy of infrared sensor 4 into temperature, and heating control means for inductively heating cooking vessel 1 by passing a high-frequency current through heating coil 3 6 is provided. A plurality of infrared sensors 4 may be provided (see, for example, Patent Document 1).

  When heating is started, a high-frequency magnetic field is generated from the heating coil 3 by a signal from the heating control means 6. The cooking vessel 1 is heated by this high frequency magnetic field and the temperature rises. The temperature of the cooking container 1 is measured by the infrared sensor 4 and converted into a temperature by the temperature detection means 5, and the heating control means 6 controls the heating amount based on the result.

  When the temperature detection is performed by the infrared sensor 4, the temperature can be detected correctly if the detection area of the infrared sensor 4 covers the bottom of the cooking container 1, but the bottom of the cooking container 1 can be detected from the detection area of the infrared sensor 4. In the case where the detachment occurs, the infrared energy from the cooking container 1 decreases, and the ambient light such as visible light around the cooking container 1 is received by the infrared sensor 4, so the S / N ratio deteriorates and the temperature There is a problem that the detection error increases.

In order to avoid this, an illuminance sensor 7 for measuring the illuminance around the cooking container 1 is provided, and it is determined whether there is a possibility that energy from other than the cooking container 1 enters the infrared sensor 4, When it is determined that the infrared sensor 4 is receiving energy from other than the cooking container 1, it is detected that the cooking container 1 is placed out of the detection area of the infrared sensor 4, and heating is stopped. There is something to do.
JP 2003-109736 A

  However, in the conventional configuration, when the illuminance sensor 7 detects that the surrounding of the cooking container 1 is dark and the amount of infrared energy received by the infrared sensor 4 is small, the detection area of the infrared sensor 4 is set as the cooking container. 1 is not covered so that the infrared detection energy is low, or the cooking container 1 covers the detection area of the infrared sensor 4 but the temperature is low, so that the infrared sensor 4 has received a small amount of infrared energy. I can't.

  If the cooking container 1 does not cover the detection area of the infrared sensor 4, if the heating is continued, the temperature of the cooking container 1 cannot be accurately detected and the cooking container 1 may become so hot that the user does not intend. Therefore, heating must be stopped, and when cooking in a dark kitchen, the illuminance sensor 7 detects that the surroundings of the heating cooker are dark and can control heating based on the temperature information of the infrared sensor 4. It had the problem of being unable to do so.

In order to solve the conventional problems, apart from the temperature sensor is provided, the heating power according to the temperature detected by the temperature sensor when the detected illuminance of the illuminance sensor is dark induction heating device and the infrared sensor of the present invention It is set as the structure which controls.

The result, room may when it is determined that the dark is where the cooking container is detached from the detection temperature range of the infrared sensor, to control the heating power by temperature information more detected infrared sensor can not, it detects the temperature of the cooking container from the temperature sensor of the infrared sensor other than one in which it is possible to control the heating power based on the temperature information.

When it is determined that the infrared sensor is capable of receiving infrared energy from the cooking container , the induction heating device of the present invention performs heating according to the temperature calculated from the infrared energy from the cooking container received by the infrared sensor. Stopping or heating power can be suppressed. Moreover, in a state where ambient light can enter from the surroundings and the bottom of the cooking container may not cover the detection area of the infrared sensor, heating can be stopped or heating power can be suppressed. Moreover, it is not possible to the bottom of the cooking container when the room by the detection result of the illuminance sensor is detected as a dark it is determined whether or not covers the detection area of the infrared sensor, the temperature information of the infrared sensor instead of controlling the heating based on, it senses the temperature of the cooking container by the infrared sensor other than the temperature sensor, stops or cooking container perform control so as to suppress the heating power is used to heat It is possible to realize an induction heating device that prevents a high temperature that is not intended by the user and that does not impair safety.

The first invention includes a top plate for placing a cooking container for heating food, and a heating coil to generate an induced magnetic field to heat the cooking container, radiated from the cooking container through the top plate An infrared sensor for detecting the infrared light, a first temperature detecting means for converting the temperature of the cooking container from the energy received by the infrared sensor, and an illuminance sensor for detecting the illuminance around the cooking container. A second temperature detecting means by a temperature sensor arranged in contact with the lower surface of the top plate, and a high frequency current of the heating coil according to temperature information of the first temperature detecting means and the second temperature detecting means. and heating control means for controlling to control the heating power of the cooking vessel, the adjusting barber from energy received in the illuminance sensor and the light receiving to energy of the infrared sensor But and a cooking vessel detection means for detecting whether it is located in the detection area of the infrared sensor, the heating control means detects the illuminance of the illuminance sensor is smaller than a predetermined value 1 and the infrared The energy received by the sensor is greater than a predetermined value 2, or the illuminance detected by the illuminance sensor is greater than a predetermined value 1 and the energy received by the infrared sensor is less than a predetermined value 2. In the case, the heating is stopped or the heating power is suppressed based on the temperature information of the first temperature detecting means, the illuminance detected by the illuminance sensor is greater than a predetermined value 1 and the light received by the infrared sensor. when the energy of is greater than a predetermined value 2, the heating was stopped or suppressed heating power, the detected illuminance of the illuminance sensor is smaller than a predetermined value 1 and of the infrared sensor When the energy of light is less than a predetermined value 2, the first of said second temperature detecting means without control heating according to the temperature information of the temperature detecting means detecting result in accordance with prior SL pressure It performs control so as to suppress thermal power. When it is determined that the infrared energy from the cooking container can be received, the first temperature detection means stops heating or suppresses the heating power according to the temperature calculated from the infrared energy from the cooking container. it can. Moreover, in a state where ambient light can enter from the surroundings and the bottom of the cooking container may not cover the detection area of the infrared sensor, heating can be stopped or heating power can be suppressed. In addition, when the cooking container detection means cooking in a dark kitchen, ambient light does not reach the illuminance sensor, so the illuminance sensor detects that the surroundings of the heating cooker are dark, and the amount of infrared energy received by the infrared sensor is low. In the case of a small number, the detection area of the infrared sensor is not covered by the cooking container, so the infrared detection energy is low, or the cooking container covers the detection area of the infrared sensor, but the infrared sensor receives light because the temperature is low. Cannot determine if the amount of infrared energy is low. Instead of controlling the heating based on the temperature information of the infrared sensor in this case, by the second temperature detecting means detects the temperature of the cooking container, the control to suppress stop or heating power of the heating By doing so, it is possible to heat even when the surroundings of the induction heating device are dark, so that the cooking container can be prevented from becoming a high temperature unintended by the user without impairing usability, and induction that does not impair safety A heating device can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 shows a schematic configuration diagram of an induction heating apparatus according to a first embodiment of the present invention.

  In FIG. 1, the cooking container 1 is placed on a top plate 2 disposed on the top surface of the induction heating apparatus main body, and the heating coil 3 is disposed below the top plate 2. The infrared sensor 4 is disposed at the center of the heating coil 3, and the first temperature detection means 5 converts the temperature from the energy received by the infrared sensor 4.

  The illuminance sensor 7 is disposed below the top plate 2, detects visible light through the top plate 2, and detects the illuminance around the induction heating device.

Cooking container detecting means 8 determines the presence or absence of the cooking container 1 from the received light energy of the energy and the illuminance sensor 7 received the infrared sensor 4, the induction cooking container 1 heating control means 6 by passing a high-frequency current to heating coil 3 heated, controlling the heating power for heating the cooking container 1. The temperature sensor 9 installed in contact with the lower surface of the top plate 2 is a thermistor whose resistance value is changed by the heat of the cooking container 1 transmitted through the top plate 2. The second temperature detection means 10 converts the temperature from the resistance value of the temperature sensor 9.

  The cooking container detection means 8 determines the presence or absence of the cooking container 1 from the illuminance sensor 7 that detects the illuminance around the cooking container 1 and the energy received by the infrared sensor 4 and the energy received by the illuminance sensor 7.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, although not shown, when an instruction to start heating is issued to the induction heating device by an operation unit or the like connected to the heating control means 6, the heating control means 6 supplies a high-frequency current to the connected heating coil 3. . The cooking vessel 1 is placed on the top plate 2 above the heating coil 3 and is in a magnetically coupled state with the heating coil 3. A high-frequency magnetic field is generated from the heating coil 3 supplied with the high-frequency current, an eddy current due to electromagnetic induction flows in the cooking vessel 1, and the cooking vessel 1 is heated by the Joule heat.

  The infrared sensor 4 receives infrared rays emitted from the cooking container 1 through the top plate 2, and the information is sent to the first temperature detection means 5. The first temperature detection means 5 calculates the temperature of the cooking container 1 from the amount of energy received by the infrared sensor 4 and sends the temperature information to the heating control means 6.

Heating control means 6, while controlling the heating power specified by the user, it performs the suppression, or heating stops heating power by temperature information obtained from the first temperature detecting means 5. For example, when starting the heating operation mode to perform frying, the cooking vessel 1 controls the heating power so as to maintain at a predetermined temperature, or the cooking vessel 1 when you have been making regular heating abnormal suppress heating power when they are hot, or subjected to heating stop so as to ensure safety so as not to oil firing and the like. The heating control means 6 and the first temperature detection means 5 may be integrated, and a DSP or a microcomputer is often used, but is not limited to this, and is a custom IC. It doesn't matter.

  Here, the cooking vessel 1 is magnetically coupled to the heating coil 3 and is usually made of a magnetic material. Copper and aluminum, which are non-magnetic and low resistance metals, cannot be heated with a normal induction heating device, but recently, a method that can heat even a low resistance metal has been put to practical use. It may be a resistance metal cooking container. Moreover, when the diameter of the cooking container 1 is small, or when there exists a big gap between the top plate 2 and the cooking container 1, it is designed so that it cannot heat.

  The top plate 2 is a part that forms the appearance of the induction heating device, and is where the cooking container 1 is placed. The top plate 2 is made of heat-resistant tempered glass or the like, and since it is flat, it is excellent in terms of ease of cleaning and aesthetics, and is one of the advantages of the induction heating device.

  The infrared sensor 4 receives infrared rays emitted from the cooking container 1. A plurality of infrared sensors 4 may be provided. In the conventional induction heating apparatus, a contact type temperature sensor such as a thermocouple or a thermistor attached so as to be in contact with the lower portion of the top plate 2 is used. In that case, the upper part of the top plate 2 is warmed by heat conduction and radiant heat at the part where the bottom part of the cooking container 1 and the top plate 2 are in contact, and the heat is conducted toward the lower part of the top plate 2, and the temperature is reduced. Will be measured. In this case, since the temperature at the bottom of the cooking container 1 is indirectly measured through the top plate 2, it depends on the size of the contact area between the cooking container 1 and the top plate 2, the heat capacity of the top plate 2, and the like. There existed a subject that the responsiveness with respect to the temperature fluctuation of the cooking vessel 1 was bad. However, in the case of the infrared sensor 4, since infrared rays from the cooking container 1 are directly received by the infrared sensor 4, cooking is not affected by the size of the contact area between the cooking container 1 and the top plate 2 or the heat capacity of the top plate 2. There is an advantage that it reacts immediately to the temperature fluctuation of the container 1.

  Thereby, for example, when heating is performed in a state where there is no cooked food in the cooking container 1, the temperature of the cooking container 1 rapidly increases. There is a safety device that prevents the cooking container 1 from reaching the ignition point of the oil because there is a possibility that it will ignite when the oil is dropped into it. In the conventional induction heating apparatus, since there is a delay with respect to the temperature fluctuation of the cooking container 1 as described above, ignition is prevented as a design having a sufficient margin. However, the function may function even when preheating the frying pan, and the usability may be deteriorated. However, when the infrared sensor 4 is used, it is not necessary to see a margin for the delay in the thermal response due to the above-described advantages, so that such a situation can be avoided.

The first temperature detection means 5 converts the output of the infrared sensor 4 into temperature. The energy received by the infrared sensor 4 is converted into a voltage, current, or frequency determined by the energy and output. In the first temperature detector 5 is converted into a temperature from their physical quantity, it is used as the information necessary for controlling the heating power. The first temperature detecting means 5 has a function of inputting a physical quantity of the infrared sensor 4, a calculation function of converting the physical quantity into temperature, and a function of outputting the converted temperature. The converted temperature information is sent to the heating control means 6, and various controls are performed according to the temperature.

  This method has no problem when the detection area of the infrared sensor 4 is entirely covered by the bottom of the cooking container 1 and the energy detected by the infrared sensor 4 is all infrared energy from the cooking container 1. However, if there is a part of the detection area of the infrared sensor 4 where the bottom of the cooking container 1 is not covered, disturbance light enters from that part, and the infrared sensor 4 receives the energy of the disturbance light. Since the energy of disturbance light is larger than the infrared energy radiated from the cooking container 1, the infrared energy from the cooking container 1 cannot be detected.

  The illuminance sensor 7 is for detecting the illuminance around the cooking container 1. Although the illuminance sensor 7 has a characteristic that matches the human visual sensitivity, it does not have to be that particular.

  The temperature sensor 9 is a thermistor attached so as to be in contact with the lower part of the top plate 2. The upper part of the top plate 2 is warmed by heat conduction and radiant heat at the part where the bottom part of the cooking container 1 and the top plate 2 are in contact, and the heat is conducted toward the lower part of the top plate 2 to measure the temperature. Since the temperature of the bottom portion of the cooking container 1 is indirectly measured through the top plate 2, the response to the temperature fluctuation of the cooking container 1 is poor, but the temperature to the measurement temperature due to external disturbance like the infrared sensor 4 is poor. Since there is no influence, in this case, the infrared sensor 4 is used as auxiliary temperature detection means used when it becomes unusable due to the influence of disturbance.

The second temperature detection means 10 converts the output of the temperature sensor 9 into a temperature. Second temperature detecting means 10 is converted to a temperature from the voltage of the temperature sensor 9, is used as the information necessary for controlling the heating power. The second temperature detection means 11 has a function of inputting a physical quantity of the temperature sensor 9, a calculation function of converting the physical quantity into temperature, and a function of outputting the converted temperature. The converted temperature information is sent to the heating control means 6, and various controls are performed according to the temperature.

  Although the temperature sensor 9 is described as a thermistor in the present embodiment, it may be a contact type temperature sensor such as a metal resistance thermometer or a thermocouple.

  The cooking container detection means 8 determines the presence or absence of the cooking container 1 from the energy received by the infrared sensor 4 and the energy received by the illuminance sensor 7.

  The detection method of a cooking container is demonstrated using Fig.2 (a).

  In STEP1, first, the energy received by the infrared sensor 4 is measured. The measured value is V1.

  In STEP2, the energy received by the illuminance sensor 7 is measured. The measured value is V2.

  In STEP 3, the magnitude of V1 measured by the infrared sensor 4 and the determination value α are compared. The determination value α is energy detected by the infrared sensor 4 when the infrared sensor 4 is placed in a dark state and does not receive disturbance light energy and the cooking container 1 is at a predetermined temperature (for example, 25 ° C.). Set the value to the sum of the variation element and the margin.

  If V1> α, this means that it is receiving infrared energy that is emitted when the cooking container 1 is higher than a predetermined temperature, or is larger than the energy in the dark state due to the energy of disturbance light. It can be thought that it became.

  The predetermined temperature is 25 ° C., but may be any number as long as the temperature of the object is equal to or lower than the temperature at which the infrared sensor 4 can detect infrared energy.

  In STEP4, the magnitude of V2 measured by the illuminance sensor 7 and the determination value β are compared. The determination value β will be described with reference to FIG. The difference between the energy a received by the infrared sensor 4 when the infrared sensor 4 is placed in a dark state and the energy b received by the infrared sensor 4 when the infrared sensor 4 is placed in an environment with a certain illuminance γ. The illuminance is increased to a level at which (ba) can be detected, and β is set as a value obtained by adding a variation element and a margin to the illuminance γ when the energy of the infrared sensor 4 becomes b. When V2> β, there is sufficient illuminance around the cooking container 1 so that if the bottom of the cooking container 1 does not cover the detection area of the infrared sensor 4, It can be considered that the infrared sensor 4 is placed in a state where the light enters the detection area of the infrared sensor 4 as disturbance light, and the infrared sensor 4 receives the light to increase the received light energy.

  Since STEP5 has the conditions of V1> α and V2 <β, it can be seen that the surroundings are sufficiently darker than V2 <β, and it is not a situation in which ambient light can enter from the surroundings. Furthermore, it is considered that infrared energy from the cooking container 1 is received from V1> α. That is, since the bottom of the cooking container 1 covers the detection area of the infrared sensor 4 and the infrared energy from the cooking container 1 can be received, it is determined that the cooking container 1 is present and the cooking container 1 is heated. The first temperature detection means 5 can accurately calculate the temperature from the energy received by the infrared sensor 4 accurately. At this time, since the infrared sensor 4 has already received the infrared energy from the cooking container 1, it turns out that the cooking container 1 is high temperature.

Since STEP6 satisfies the conditions of V1> α and V2> β, it can be seen that the surroundings are sufficiently brighter than V2> β, and ambient light can enter from the surroundings. It is considered that there is a possibility that light around the cooking vessel 1 enters as disturbance light and receives infrared energy from V1> α. That is, there is a possibility that the bottom of the cooking container 1 does not cover the detection area of the infrared sensor 4, and there is a possibility that the S / N ratio is deteriorated by light other than the infrared energy from the cooking container 1 and the temperature cannot be accurately detected. There is. Therefore, such a cooking container 1 in a state, it is determined that there is no, control is performed so as to suppress the stop or heating power of the heating of the cooking container 1.

  Or since the bottom part of the cooking container 1 has covered the detection area of the infrared sensor 4, and the cooking container 1 has become more than predetermined | prescribed temperature, the infrared sensor 4 may receive infrared energy. Since these cannot be distinguished from each other, the control may be such that the user of the induction heating device is notified that the presence or absence of the cooking container 1 cannot be determined.

  Since STEP7 is the same as STEP4, description is abbreviate | omitted.

  Since STEP8 is a condition of V1 <α, V2> β, it can be seen that the surroundings are sufficiently brighter than V2> β, and ambient light can enter from the surroundings. From V1 <α, it can be determined that the infrared sensor 4 is in a dark state. That is, although the ambient light may be received by the infrared sensor 4, the bottom of the cooking container 1 covers the detection area of the infrared sensor 4, so the ambient light is blocked. Since the cooking container 1 is determined to be present because the infrared energy from 1 can be received, the temperature detection means 5 can accurately calculate the temperature from the energy received by the infrared sensor 4 even if the cooking container 1 is heated. . At this time, since the cooking container 1 is low temperature, it turns out that infrared energy is not radiated | emitted.

  Since STEP9 has the conditions of V1 <α and V2 <β, it can be seen that the surroundings are sufficiently darker than V2 <β, and it is not a situation where ambient light can enter from the surroundings. From V1 <α, the infrared sensor 4 is the same as when it is placed in a dark state. That is, the infrared sensor 4 receives neither infrared energy from the cooking container 1 nor ambient light from the surroundings, but it is known that there is no disturbing light from the surroundings. The detection area may not be covered, and it cannot be determined that the cooking container 1 is present. Therefore, in such a state, the presence or absence of the cooking container 1 cannot be determined.

In case you can not determine the presence or absence of the cooking vessel 1, the heating control means 6, instead of controlling the heating power based on the temperature information of the first temperature detector 5, the temperature information of the second temperature detecting means 10 the performing the control of the heating power to the original. At this time, the temperature sensor 9 has poor responsiveness compared with the infrared sensor 4, the heating control means inhibiting heat power in accordance with the detection result of the second temperature detecting means 10 so that the temperature of the pan bottom is not too elevated Provide a function to prevent overheating to stop.

Figure 3 is a graph of the output and the heating power of the second temperature detecting means 10 when the overheat protection function is working in the present embodiment. Overtemperature protection in this matter stores the temperature threshold value corresponding to each set thermal power in the storage means provided in the heating control means 6, the heating power in the heating control means 6 is set by the user firepower During the control, when the temperature detected by the second temperature detection means 10 exceeds the temperature threshold corresponding to the set heating power, the heating control means 6 performs control so as to lower the set heating power. In addition, the effective temperature threshold is changed according to the changed set thermal power by lowering the set thermal power. Since the heating power is the greater the difference between the temperature detected by the temperature and the temperature sensor 9 as the cooking vessel 1 larger the temperature threshold of the cut-out is smaller the higher the set thermal power, the lower the set thermal power values Enlarge. Thereby, the function which can suppress overshoot of pan bottom temperature and can keep pan bottom temperature as high as possible is realized.

  In this embodiment, the set thermal power is set to five stages of 2000 W, 1500 W, 1000 W, 500 W, and 330 W, and the thresholds for preventing overheating are 185 ° C., 200 ° C., 215 ° C., 225 ° C., and 230 ° C., respectively. In the present embodiment, the threshold value for the overheat prevention function is set as described above. However, the present invention is not limited to this as long as it does not ignite with a small amount of oil.

  Due to the over-temperature prevention function, it may be inconvenient when pre-heating a frying pan or frying. The illuminance detected by the illuminance sensor 7 is dark except for the possibility that the surface of the top plate 2 immediately above where the illuminance sensor 7 is disposed is dirty or that there is a possibility that something that blocks light is placed. Because it is dark. In the case of cooking such as stir-fry, while the user performs cooking while operating the pan or pan, the room is rarely dark, and the user intentionally darkens the room when leaving the pan and the kitchen, when leaving the kitchen As a dish that continues to be heated, it is mainly cooked for a long time with a weak heating power such as boiled food, and the setting heating power used is relatively low heating power. Therefore, when the room is dark, the overheat prevention function based on the temperature information of the second temperature detection means may cause a lack of heating power during frying. Since it is considered that there are few, it does not greatly impair usability.

In the induction heating apparatus according to the present embodiment, when the cooking container detection means 8 detects that the cooking container 1 is present, the heating control means 6 supplies the cooking container 1 to the cooking container 1 based on the temperature information of the first temperature detection means 5. by controlling the heating power, increased safety for the oil fire, etc., to control the cooking container 1 at a temperature that does not occur, it is possible to realize a user-friendly induction heater. When the detection result of the illuminance sensor 7 detects that the room is dark, the function of preventing overheating based on the temperature information of the second temperature detection means can guide the safety and ease of use. A heating device can be realized.

As described above, in the induction heating device according to the present invention, it is possible to determine whether or not the bottom of the cooking container covers the detection area of the infrared sensor when it is detected that the room is dark based on the detection result of the illuminance sensor. inability to, to detect the temperature of the cooking container by the temperature sensors other than the infrared sensor, the cooking vessel perform control so as to suppress the stop or heating power of the heating becomes high so as not to the user's intention Therefore, the present invention can be applied to uses such as a heating device that detects the bottom of a cooking container with an infrared sensor.

Schematic block diagram of the induction heating apparatus in Embodiment 1 of the present invention (A) Flow chart of determination in cooking container detection means in Embodiment 1 of the present invention (b) Diagram showing design of determination value in cooking container detection means in Embodiment 1 of the present invention The graph showing operation | movement of the overheat prevention function in Embodiment 1 of this invention Schematic configuration diagram of a conventional induction heating device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooking container 2 Top plate 3 Heating coil 4 Infrared sensor 5 1st temperature detection means 6 Heating control means 7 Illuminance sensor 8 Cooking container detection means 9 Temperature sensor 10 2nd temperature detection means

Claims (1)

Detecting a top plate for placing a cooking container for heating food, and a heating coil to generate an induced magnetic field to heat the cooking container, the infrared rays emitted from the cooking container through the top plate An infrared sensor; first temperature detecting means for converting the temperature of the cooking container from energy received by the infrared sensor; an illuminance sensor for detecting illuminance around the cooking container; and an underside of the top plate A second temperature detecting means by means of a temperature sensor arranged in contact with the cooking container and controlling the high-frequency current of the heating coil in accordance with temperature information of the first temperature detecting means and the second temperature detecting means; and a heating control means for controlling the pressurized heat of the heating control means detects the illuminance of the illuminance sensor is smaller than a predetermined value 1 and the infrared sensor When the received energy is greater than a predetermined value 2 or when the illuminance detected by the illuminance sensor is greater than a predetermined value 1 and the energy received by the infrared sensor is less than a predetermined value 2 Is based on the temperature information of the first temperature detecting means, stops heating or suppresses heating power, and the illuminance detected by the illuminance sensor is greater than a predetermined value 1 and the energy received by the infrared sensor. Is greater than a predetermined value 2, heating is stopped or heating power is suppressed, and the illuminance detected by the illuminance sensor is smaller than a predetermined value 1 and the energy received by the infrared sensor is predetermined . when than the value 2 is small, the suppressed stop or heating power of the heating in accordance with the detection result of the second temperature detecting means without control heating according to the temperature information of said first temperature sensing means Do Induction heating apparatus for performing controlled so.