JP3206400B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used in ordinary households and having an automatic temperature control function.

[0002]

2. Description of the Related Art In recent years, induction heating cookers have been recognized for their excellent features of safety, cleanliness, and high efficiency, and because of their high safety and controllability, devices having an automatic temperature control function are becoming popular. .

A conventional induction heating cooker will be described below. In FIG. 6, 1 is a pan, 2 is a heating coil, 3
Is a top plate on which the pan 1 is placed, 4 is a temperature sensor disposed on the back surface of the top plate and senses the temperature of the pan 1 via the top plate 3, 5 is connected to the temperature sensor 4 and an electric signal indicating a change in the temperature sensor 4 , 6 is a setting unit for setting the cooking temperature by the user, and 7 is the power input to the pan 1 so that the temperature received from the temperature detection unit 5 matches the temperature set by the setting unit 6. The temperature controller 8 is a high-frequency power supply that supplies a high-frequency current to the heating coil 2 to supply the electric power determined by the temperature controller 7 to the pan 1.

With the above-described configuration, in the conventional induction heating cooker, the temperature detected by the temperature sensor 4 via the top plate 3 is compared with the temperature set by the user, and the electric power input to the pan 1 is obtained. Is determined, the function of automatic temperature control for automatically controlling the input power so that the cooking temperature of the pan 1 becomes the temperature set by the user has been realized.

[0005]

In the configuration of the conventional induction heating cooker described above, the temperature detected by the temperature sensor 4 is directly compared with the temperature set by the user to determine the electric power to be input to the pan 1. I was On the other hand, looking at the temperature distribution of the pot 1 heated by the induction heating cooker and the cooked material such as the tempura oil contained therein, the temperature of the bottom portion of the pot heated by the induction heating is highest, and This tendency tends to occur as the input power to the device increases. Therefore, when the input power to the pan 1 is large, the temperature at the bottom of the pan becomes higher than the temperature of the food, and conversely, when the input power to the pan 1 is small, the difference becomes small, and the temperature at the bottom of the pan and the temperature of the food are reduced. Will tend to match. For this reason, in the actual cooking, when the temperature in the pot 1 is reduced when a load is applied and the power to the pot 1 is increased to increase the temperature by induction heating, the temperature of the pot bottom and the temperature of the cooked food are increased. There was a problem that the relationship changed and the temperature was stabilized at a temperature lower than the temperature at the time of stabilization, and the temperature did not return to the temperature set by the user and stable cooking performance was not obtained.

The present invention solves the above-mentioned conventional problem, and corrects the temperature difference between the bottom of the pot and the food caused by the amount of electric power for induction heating of the pan, so that the temperature of the food always becomes the temperature set by the user. The purpose is to realize automatic control.

[0007]

In order to solve the above-mentioned problems, the present invention relates to a pot, a heating coil, a top plate on which the pot is placed, and a temperature sensor disposed on the back of the top plate. A temperature detecting unit that converts a change in the temperature sensor into an electric signal, a setting unit that sets a cooking temperature by a user, and a pan set so that a temperature received from the temperature detecting unit matches a temperature set by the setting unit. A temperature control unit that determines the power to be input, a high-frequency power supply unit that supplies a high-frequency current to the heating coil to supply the power determined by the temperature control unit to the pan, and a power supply to the pan at a predetermined time in the past. An integrated power measuring unit that measures an integrated power value, a setting correction unit that corrects the setting of the setting unit, and a delay unit that continues correction for a fixed time once the correction has been activated, wherein the setting correction unit is Said If the integrated power value measured by the calculated power measurement section is greater than a predetermined value is made by correcting to be higher by a predetermined prescribed value than the temperature of the setting part.

Further, if necessary, a correction canceling unit for canceling the correction by the setting correcting unit, a load input detecting unit for detecting a load input due to a sudden decrease in the temperature detected by the temperature detecting unit, or an integrated power A maximum power limiting unit for limiting the maximum value of the power to be applied based on the value of the integrated value measured by the measuring unit is provided.

[0009]

According to the first aspect of the present invention, when the integrated power value measured by the integrated power measuring section is larger than a predetermined value, the correction is made so as to be higher than the temperature of the setting section by a predetermined predetermined value. By providing a setting correction unit
When the integrated power supplied to the pan is large and the temperature of the bottom of the pot is higher than the temperature of the food, the temperature sensor measures higher than the actual temperature of the food to detect the temperature of the bottom of the pan,
The temperature of the cooked food can be kept constant by controlling the sensor temperature so that the temperature becomes higher than the temperature set by the user when the integrated power value equal to or higher than the preset integrated power value is applied. Also, when this correction is activated, the correction is canceled during cooking by delaying the correction for an appropriate time required for the intended cooking, the temperature of the food decreases during cooking, and It is possible to avoid a situation in which the quality of the object is reduced.

According to a second aspect of the present invention, after the correction is once performed so as to be higher than the temperature of the setting section by a predetermined value, the correction is canceled when the integrated value becomes equal to or less than the predetermined value. Since the configuration is such that the correction is cancelled, the correction is not inadvertently canceled during cooking even in continuous cooking or the like. In addition, when entering correction and when canceling can be set independently, when entering correction, set the integration time short and make it sensitive quickly, and when canceling correction, set the integration time long and slowly check the end of cooking. The correction can be canceled from.

According to a third aspect of the present invention, a load application is detected by a sudden decrease in temperature detected by the temperature detection unit, and when the load application is detected, the correction value of the setting correction unit is increased. With this, a large load is input, the temperature of the food drops sharply, and the temperature difference between the food and the bottom of the pot increases quickly, and the temperature drop of the food caused by a large load is quickly detected. Can be recovered.

According to a fourth aspect of the present invention, when the integrated value measured by the integrated power measuring section is small, the maximum value of the applied power is limited, so that no load is applied or a small load is applied. In this case, it is possible to effectively prevent an overshoot of the food temperature due to excessive power application.

According to the fifth aspect of the present invention, since the temperature at the bottom of the pan can be directly sensed without passing through the top plate, not only can the temperature be accurately detected even with a warped pan, but there is no delay in heat conduction at the top plate, and the temperature can be quickly increased. Detection becomes possible, and more appropriate automatic temperature adjustment can be performed together with the correction based on the integrated power value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) In FIG. 1, 1 is a pan, 2 is a heating coil, 3 is a top plate on which the pan 1 is placed, and 4 is a back plate disposed on the back of the top plate to sense the temperature of the pan 1 via the top plate 3. A temperature sensor 5 connected to the temperature sensor 4 for converting a change in the temperature sensor 4 into an electric signal; a setting unit 6 for setting a user's cooking temperature; and a temperature setting unit 7 for setting a temperature received from the temperature detection unit 5. The temperature controller 8 determines the power to be input to the pan 1 so as to match the temperature set by the unit 6. The temperature controller 8 supplies a high-frequency current to the heating coil 2 to supply the power determined by the temperature controller 7 to the pan 1. A high-frequency power supply, 9 is an integrated power measuring unit for measuring the integrated power value of the power supplied to the pot 1 at a predetermined time in the past, and 10 is when the integrated power value measured by the integrated power measuring unit 9 is larger than a predetermined value. To Setting correction unit that corrects to be higher by a predetermined prescribed value than the temperature of the setting unit 6, 11 is a delay section to continue the predetermined time correction when worked once corrected.

According to the present embodiment, it is possible to measure the integrated power supplied to the pan 1 at a predetermined time in the past, and to correct the difference between the preset pot bottom temperature and the food temperature by the integrated power value. The temperature of the food can be kept constant by the correction. In addition, when this correction works, by delaying the correction by setting an appropriate time required for the intended cooking, for example, about 5 minutes for fried food,
It is possible to prevent the correction from being canceled during cooking and the temperature of the cooked food from dropping during the cooking, thereby preventing the workmanship of the cooked food from lowering.

(Embodiment 2) In FIG. 2, 1 is a pan,
2 is a heating coil, 3 is a top plate on which the pan 1 is placed,
Reference numeral 4 denotes a temperature sensor which is disposed on the back surface of the top plate and senses the temperature of the pan 1 via the top plate 3. Reference numeral 5 denotes a temperature detection unit which is connected to the temperature sensor 4 and converts a change in the temperature sensor 4 into an electric signal. Is a setting unit that sets the cooking temperature, 7 is a temperature control unit that determines the power input to the pan 1 so that the temperature received from the temperature detection unit 5 matches the temperature set by the setting unit 6, and 8 is a temperature control unit. A high-frequency power supply for supplying a high-frequency current to the heating coil 2 to supply the power determined by 7 to the pan 1; an integrated power measuring unit 9 for measuring an integrated power value of power supplied to the pan 1 for a predetermined time in the past; Reference numeral 10 denotes a setting correction unit for correcting the integrated power value measured by the integrated power measuring unit 9 to be higher than the temperature of the setting unit 6 by a predetermined value if the integrated power value is larger than a predetermined value. The correction canceling unit cancels the correction when the integrated value measured by the unit becomes equal to or less than a predetermined value.

According to the present embodiment, after the correction is once performed so as to be higher than the temperature of the setting unit by a predetermined value, the correction can be canceled when the integrated value becomes equal to or less than the predetermined value. Therefore, the correction is not canceled during cooking even in continuous cooking or the like. In addition, when entering correction and when canceling can be set independently, when entering correction, the integration time is set to be short, for example, about 30 seconds, and quickly and sensitively. When canceling correction, the integration time is increased, for example, to about 2 minutes. The correction can be released from the setting and the end of cooking can be slowly checked to improve the quality of cooking.

(Embodiment 3) In FIG. 3, 1 is a pan,
2 is a heating coil, 3 is a top plate on which the pan 1 is placed,
Reference numeral 4 denotes a temperature sensor which is disposed on the back surface of the top plate and senses the temperature of the pan 1 via the top plate 3. Reference numeral 5 denotes a temperature detection unit which is connected to the temperature sensor 4 and converts a change in the temperature sensor 4 into an electric signal. Is a setting unit that sets the cooking temperature, 7 is a temperature control unit that determines the power input to the pan 1 so that the temperature received from the temperature detection unit 5 matches the temperature set by the setting unit 6, and 8 is a temperature control unit. A high-frequency power supply for supplying a high-frequency current to the heating coil 2 to supply the power determined by 7 to the pan 1; an integrated power measuring unit 9 for measuring an integrated power value of power supplied to the pan 1 for a predetermined time in the past; 10 is a setting correction unit that corrects the integrated power value measured by the integrated power measuring unit 9 so that the temperature becomes higher than the temperature of the setting unit 6 by a predetermined value if the integrated power value is larger than a predetermined value. Work A delay unit 13 for continuing the correction for a certain period of time, and a load input detecting unit 13 for detecting a load input due to a rapid decrease in the temperature detected by the temperature detecting unit 5.

According to the present embodiment, the load application is detected by a sudden decrease in the temperature detected by the temperature detection unit 5, and when the load application is detected, the correction value in the setting correction unit 10 is increased. Can be. This is a function for correcting a state in which the temperature of the food sharply drops due to the input of a large load and the temperature difference between the food and the bottom of the pot increases.
It is possible to quickly recover from a large decrease in the temperature of the food due to the application of a large load.

(Embodiment 4) In FIG. 4, 1 is a pan,
2 is a heating coil, 3 is a top plate on which the pan 1 is placed,
Reference numeral 4 denotes a temperature sensor which is disposed on the back surface of the top plate and senses the temperature of the pan 1 via the top plate 3. Reference numeral 5 denotes a temperature detection unit which is connected to the temperature sensor 4 and converts a change in the temperature sensor 4 into an electric signal. Is a setting unit that sets the cooking temperature, 7 is a temperature control unit that determines the power input to the pan 1 so that the temperature received from the temperature detection unit 5 matches the temperature set by the setting unit 6, and 8 is a temperature control unit. A high-frequency power supply for supplying a high-frequency current to the heating coil 2 to supply the power determined by 7 to the pan 1; an integrated power measuring unit 9 for measuring an integrated power value of power supplied to the pan 1 for a predetermined time in the past; 10 is a setting correction unit that corrects the integrated power value measured by the integrated power measuring unit 9 so that the temperature becomes higher than the temperature of the setting unit 6 by a predetermined value if the integrated power value is larger than a predetermined value. Work In the case where there is a delay, a delay unit for continuing the correction for a fixed time, and a maximum power limiting unit 14 for limiting the maximum value of the power to be applied based on the value of the integrated value measured by the integrated power measuring unit 9.

According to this embodiment, when the integrated value measured by the integrated power measuring section 9 is small, the maximum value of the applied power can be limited. Accordingly, it is possible to prevent excessive electric power from being applied when the load is not applied or a small load is applied, and the food temperature to overshoot and become too high.

(Embodiment 5) In FIG. 5, 1 is a pan,
2 is a heating coil, 16 is a temperature sensor, 15 is a top plate in which the center is partially removed and the temperature sensor 16 can directly detect the temperature of the pan 1, 5 is connected to the temperature sensor 4 and changes in the temperature sensor 4 Is a temperature detecting unit for converting the temperature into an electric signal, 6 is a setting unit for setting the cooking temperature by the user, and 7 is input to the pan 1 so that the temperature received from the temperature detecting unit 5 matches the temperature set by the setting unit 6. A temperature controller for determining power, 8 is a high-frequency power supply for supplying a high-frequency current to the heating coil 2 to supply the power determined by the temperature controller 7 to the pan 1, and 9 is a supply to the pan 1 at a predetermined time in the past. The integrated power measuring unit 10 for measuring the integrated power value of the power becomes higher than the temperature of the setting unit 6 by a predetermined value when the integrated power value measured by the integrated power measuring unit 9 is larger than the predetermined value. To correct Setting correction unit, 11 is a delay section to continue the predetermined time correction when worked once corrected.

According to the present embodiment, the temperature of the bottom of the pot can be directly sensed without the intervention of the top plate, so that not only accurate detection of the warped pot 1 is possible, but also quick temperature detection because there is no conduction delay in the top plate. It becomes possible, and more appropriate automatic temperature adjustment becomes possible in combination with the correction by the integrated power value.

[0024]

As described above, according to the first aspect of the present invention, when the integrated power value measured by the integrated power measuring unit is larger than the predetermined value, the temperature becomes higher by a predetermined value than the temperature of the setting unit. The temperature sensor detects the temperature of the pan bottom when the integrated power supplied to the pan is large and the pan bottom temperature is higher than the cooking temperature. The temperature of the food is measured to be higher than the temperature of the food, but by controlling the sensor temperature so that the temperature becomes higher than the temperature set by the user when the integrated power value equal to or higher than the preset integrated power value is applied, Can be kept constant. Also, when this correction is activated, the correction is canceled during cooking by delaying the correction for an appropriate time required for the intended cooking, the temperature of the food decreases during cooking, and It is possible to avoid a situation in which the quality of the object is reduced.

According to the second aspect of the present invention, after the correction is once performed so that the temperature becomes higher than the temperature of the setting unit by a predetermined value, the correction is canceled and the integrated value becomes equal to or less than the predetermined value. In such a configuration, the correction is released when the correction is performed, so that the correction is not inadvertently released during cooking even in continuous cooking or the like. In addition, when entering correction and when canceling can be set independently, when entering correction, set the integration time short and make it sensitive quickly, and when canceling correction, set the integration time long and slowly check the end of cooking. The correction can be canceled from.

According to the third aspect of the present invention, load input is detected by a sudden decrease in the temperature detected by the temperature detection unit, and when the load input is detected, the correction value by the setting correction unit is detected. By increasing the load,
It is possible to quickly detect a state in which the temperature of the food suddenly decreases and the temperature difference between the food and the bottom of the pan becomes large, and quickly recover a large temperature drop of the food due to the application of a large load.

According to the fourth aspect of the present invention, when the integrated value measured by the integrated power measuring section is small, the maximum value of the applied power is limited, so that there is no load or the like. It is possible to effectively prevent an overshoot of the food temperature due to excessive power application when a load is applied.

Furthermore, according to the fifth aspect of the present invention, since the temperature at the bottom of the pan can be directly sensed without passing through the top plate, not only can accurate detection be made even with a warped pan, but also a delay in heat conduction at the top plate. As a result, quick temperature detection is possible, and more appropriate automatic temperature adjustment can be performed in addition to the correction based on the integrated power value.

[Brief description of the drawings]

FIG. 1 is a block diagram of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an induction heating cooker according to a second embodiment of the present invention.

FIG. 3 is a block diagram of an induction heating cooker according to a third embodiment of the present invention.

FIG. 4 is a block diagram of an induction heating cooker according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of an induction heating cooker according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram of an induction heating cooker in a conventional example.

[Explanation of symbols]

 1 Pot 2 Heating coil 3 Top plate 4 Temperature sensor 5 Temperature detection unit 6 Setting unit 7 Temperature control unit 8 High frequency power supply unit 9 Integrated power measurement unit 10 Setting correction unit 11 Delay unit 12 Correction cancellation unit 13 Load input detection unit 14 Maximum power Restriction

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Miki Hono 1006, Oazadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-8-322716 (JP, A) JP-A-61- 92631 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/00 104 A47J 27/00 109 A47J 27/00 103 H05B 6/12 F24C 7/04 301

Claims (5)

(57) [Claims] 1. A pot, a top plate on which the pot is placed, a temperature sensor disposed on a back surface of the top plate, a temperature detection unit that converts a change in the temperature sensor into an electric signal, and a cooking temperature. A setting unit for arbitrarily setting, a temperature control unit for determining power to be input to the pan so that a temperature received from the temperature detection unit matches a temperature set by the setting unit, and a power determined by the temperature control unit. High-frequency power supply unit that supplies high-frequency current to the heating coil to supply the pan to the pan, an integrated power measurement unit that measures the integrated power value of the power supplied to the pan for a predetermined time in the past, and a setting that corrects the setting of the setting unit A correction unit, and a delay unit for continuing the correction for a fixed time when the correction is once performed, and the setting correction unit is configured to perform the correction when the integrated power value measured by the integrated power measurement unit is larger than a predetermined value. , An induction heating cooker corrected so as to be higher than a temperature of the setting unit by a predetermined value. 2. The apparatus according to claim 1, further comprising a correction canceling unit for canceling the correction by the setting correcting unit, wherein the correction canceling unit operates when the integrated power value measured by the integrated power measuring unit becomes equal to or less than a predetermined value. 2. The induction heating cooker according to 1. 3. A load input detecting section for detecting a load input based on a rapid decrease in temperature detected by the temperature detecting section, wherein the setting correction section increases the correction value when the load input is detected. 3. The induction heating cooker according to claim 1, wherein the induction heating cooker is enlarged. 4. The induction heating cooking according to any one of claims 1 to 3, further comprising a maximum power limiter that limits a maximum value of power to be applied based on a value of the integrated value measured by the integrated power measurement unit. vessel. 5. A pan, a top plate on which the pan is placed and a central portion thereof is partially removed, a temperature sensor disposed at a central portion of the top plate, and a change in the temperature sensor is converted into an electric signal. A temperature detection unit, a setting unit that sets a cooking temperature by a user, a temperature control unit that determines power to be input to the pan so that a temperature received from the temperature detection unit matches a temperature set by the setting unit, A high-frequency power supply unit that supplies a high-frequency current to the heating coil to supply the power determined by the temperature control unit to the pan, an integrated power measurement unit that measures an integrated power value of power supplied to the pan for a predetermined time in the past,
A setting correction unit that corrects the setting of the setting unit, and a delay unit that continues correction for a fixed time once the correction has been performed,
When the integrated power value measured by the integrated power measuring unit is larger than a predetermined value, the setting correction unit corrects the temperature of the setting unit to be higher than a predetermined value by a predetermined value. vessel.