JP2010282861A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooking performance of an induction heating cooker by accurately detecting the initial pan bottom temperature when starting cooking, accurately detecting the initial pan bottom temperature independently of a temperature condition of a top plate, and effectively improving accuracy of the pan bottom temperature by changing the set temperature. <P>SOLUTION: An initial temperature determining means 9 for determining the initial temperature of a pan 1 based on output of a temperature detecting means 8 computes a first temperature rise value in a second prescribed time based on output of a temperature detecting means 8 per a first prescribed time after starting heating, and determines that the pan bottom temperature is higher than a prescribed temperature when the temperature rise value in the second prescribed time exceeds a prescribed value within a third prescribed time from starting of heating, and changes the first set temperature to be lowered, which is set by the temperature setting means 10 higher than a stable temperature of the pan bottom 1 when starting cooking so that the temperature of a cooked material housed in the pan 1 rises quickly. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is an induction heating cooker having an infrared sensor used in a general home, and after the start of heating, the initial pan bottom temperature is accurately detected regardless of the temperature state of the top plate, and the temperature set by the temperature setting means is changed. The present invention relates to an induction heating cooker that gives an optimum set temperature and effectively improves the temperature accuracy of the pan bottom temperature.

  FIG. 5 is a block diagram showing a conventional induction heating cooker. Conventionally, the pan 14, the temperature element 16 that detects the initial temperature of the pan 14, the heating unit that heats the pan 14, and the control device that calculates and controls the control method of the heating unit based on the detected temperature of the temperature element 16. In the case of tempura cooking that heats oil such as tempura oil in the pan 14, the control device stops heating at the heating stop temperature and restarts heating at the heating resumption temperature. When the temperature detected by the temperature element 16 is higher than the predetermined temperature at the start of heating, the control device controls the heating after setting the heating restart temperature and the heating stop temperature to normal values.

  In addition, when the detected temperature of the temperature element is lower than a predetermined temperature at the start of heating, a heating control method for tempura cooking is performed in which heating control is started after setting the heating restart temperature and the heating stop temperature higher than normal values. ing.

JP 2001-167866 A

  In the conventional induction heating cooker as described above, the temperature element 16 that detects the initial temperature of the pan 14 detects the pan bottom temperature via the top plate 15. For example, when the top plate 15 is higher than a predetermined temperature and the pan bottom is lower than a predetermined temperature at the start of heating, the temperature element 16 is affected by infrared radiation from the top plate 15 at the start of heating, so the pan bottom temperature is a predetermined temperature. Although the temperature is lower, it is recognized that the detected temperature is higher than the predetermined temperature. And heating control is performed while the pan bottom temperature is recognized as a temperature higher than the predetermined temperature, and the pan bottom temperature optimum for cooking cannot be obtained. As a result, the oil stored in the pan 14 cannot obtain the optimum temperature for cooking.

  Thus, in the conventional temperature detection, since the initial pan bottom temperature cannot be accurately detected, the initial pan bottom temperature detected by the temperature of the top plate 15 varies.

  The present invention solves the above-mentioned conventional problems, and after heating is started, the initial pan bottom temperature of the pan is accurately detected regardless of the temperature state of the top plate, and the temperature set by the temperature setting means is appropriately changed. An object of the present invention is to provide an induction heating cooker that can provide an optimum set temperature and effectively improve the temperature accuracy of the pan bottom temperature.

In order to solve the conventional problem, an induction heating cooker according to the present invention includes a top plate on which a pan is placed, a heating unit provided below the top plate for induction heating the pan, and the top plate Temperature detection means by an infrared sensor that is provided below and detects the temperature of the pot bottom, initial temperature determination means for determining the initial temperature of the pot based on the output of the temperature detection means, and housed in the pot Set the first set temperature higher than the stable temperature of the pan bottom at the start of heating so that the food quickly rises, and after reaching the first set temperature, set the second set temperature lower than the first set temperature. A temperature setting means for setting, and a control means for controlling the heating output of the heating means so that the temperature detected by the temperature detection means becomes a set temperature set by the temperature setting means, The degree determination means calculates the first temperature rise value for the second predetermined time from the output of the temperature detection means at every first predetermined time after the start of heating, and within the third predetermined time from the start of heating. When the temperature rise value of the second predetermined time exceeds a predetermined value, it is determined that the pan bottom temperature is higher than the predetermined temperature, and the first set temperature set in the temperature setting means is changed to be low. It is a thing.

  As a result, the optimum set temperature is given, and the temperature accuracy of the pan bottom temperature is effectively improved.

  The induction heating cooker of the present invention includes an initial temperature determination means for determining an initial temperature of the food stored in the pan at the start of heating, for example, when the top plate is hot and the bottom temperature is low at the start of heating. Therefore, if the detection temperature of the infrared sensor is higher than a predetermined temperature due to the influence of the temperature of the top plate, it is possible to sufficiently give the optimum pan bottom temperature for cooking without causing erroneous recognition.

  As described above, the present invention accurately detects the initial pan bottom temperature regardless of the temperature state of the top plate, and then gives an optimum set temperature to each initial pan bottom temperature, thereby effectively improving the temperature accuracy of the pan bottom temperature. it can.

The figure which shows the induction heating cooking appliance in Embodiment 1 of this invention The figure which shows the heating control method of the tempura cooking of the induction heating cooking appliance of this invention The figure which shows the induction heating cooking appliance in Embodiment 2 of this invention The figure which shows the induction heating cooking appliance in Embodiment 3 of this invention The figure which shows the induction heating cooking appliance of a prior art

  The first invention includes a top plate on which a pan is placed, heating means provided below the top plate for induction heating the pan, and an infrared sensor provided below the top plate for detecting the temperature of the pan bottom. The temperature detection means according to the above, the initial temperature determination means for determining the initial temperature of the pan based on the output of the temperature detection means, and at the start of heating so that the food contained in the pan rises quickly A temperature setting means for setting a first set temperature higher than the stable temperature of the pan bottom, and setting a second set temperature lower than the first set temperature after reaching the first set temperature, and the temperature detecting means Control means for controlling the heating output of the heating means such that the temperature to be detected is set to the temperature set by the temperature setting means, and the initial temperature determination means is arranged at a first predetermined time after the start of heating. When the first temperature rise value for the second predetermined time is calculated from the output of the temperature detection means, and the temperature rise value for the second predetermined time exceeds the predetermined value within the third predetermined time from the start of heating. By determining that the pan bottom temperature is higher than a predetermined temperature and changing the first set temperature set in the temperature setting means to be low, the initial pan bottom temperature is accurately set regardless of the temperature state of the top plate. The optimal set temperature can be given by changing the first set temperature and the temperature accuracy of the pan bottom temperature can be effectively improved.

According to a second aspect of the invention, in particular, in the first aspect of the invention, the initial temperature determination means is configured to increase the first temperature for the second predetermined time from the output of the temperature detection means every first predetermined time after the start of heating. When the first temperature rise value of the second predetermined time exceeds the predetermined value within the third predetermined time from the start of heating, it is determined that the pan bottom temperature is higher than the predetermined temperature. Instead of determining that the pan bottom temperature is higher than the temperature at which the infrared sensor can detect infrared rays, and changing the first set temperature set in the temperature setting means to lower the pan bottom temperature. It can be determined that the temperature is high using the sensitivity wavelength of the infrared sensor.

  In particular, in the first or second invention, when the third temperature exceeds a second temperature rise value larger than the first temperature rise value at the second predetermined time after the first set temperature change, Furthermore, by providing a temperature setting means for changing the first set temperature to a lower value, after detecting a more accurate initial pan bottom temperature, an optimum set temperature is given to each initial pan bottom temperature, and the temperature accuracy of the pan bottom temperature is further improved. Can be done effectively.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram of an induction heating cooker according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating a heating control method for tempura cooking of the induction heating cooker of the present invention.

  In FIG. 1, a top plate 2 on which the pan 1 is placed, a heating means 7 provided below the top plate 2 for induction heating, and an infrared ray provided below the top plate 2 to detect the initial temperature of the pan 1. The temperature detection means 8 by the sensor 4, the initial temperature determination 9 for determining the initial temperature of the pan 1 based on the output of the temperature detection means 8, and at the start of heating so that the oil contained in the pan 1 rises quickly. Sets a first set temperature higher than the stable temperature of the pan bottom of the pan 1, and after reaching the first set temperature, temperature setting means 10 for setting a second set temperature lower than the first set temperature; And a control means 11 for controlling the heating output of the heating means 7 so that the temperature detected by the temperature detection means 8 becomes the set temperature set by the temperature setting means 10, and the initial temperature determination means 9 The first predetermined time The first temperature rise value for the second predetermined time is calculated from the output of the temperature detecting means 8 and the temperature rise value for the second predetermined time exceeds the predetermined value within the third predetermined time from the start of heating. The pan bottom temperature is determined to be higher than the predetermined pan bottom temperature, and the first set temperature set in the temperature setting means 10 is changed to be low.

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

  First, when the commercial power supply 5 is turned on and heating is started with an operation switch (not shown), electric power is supplied from the inverter circuit 6 to the heating coil 3, and an induction magnetic field is generated in the heating coil 3.

  And the pan 1 on the top plate 2 is heated.

  By this induction heating, the temperature of the pan 1 rises, and the temperature of the object to be heated in the pan 1, for example, oil rises.

  Here, when the temperature of the pan 1 rises, an amount of infrared rays corresponding to the temperature is emitted from the pan 1. Infrared rays that have passed through the top plate 2 enter the infrared sensor 4. The infrared sensor 4 has different detectable temperatures depending on the characteristics of the elements used. If the temperature is lower than the detection temperature, the temperature increase value is zero, and the temperature increase value is detected only when the temperature is higher than the detection temperature. The initial pan bottom temperature detection is affected by the infrared radiation from the top plate.

Therefore, in FIG. 2, the initial temperature determining means 9 determines the initial pan bottom temperature of the pan 1 not considering the temperature of the top plate, and after the start of heating, the second predetermined predetermined value is output from the output of the temperature detecting means 8 every first predetermined time. The first temperature rise value of time is calculated, and when the temperature rise value of the second predetermined time exceeds the predetermined value within the third predetermined time from the start of heating, the temperature at which the pan bottom temperature is higher than the predetermined pan bottom temperature The first set temperature is changed to a low value.

  The predetermined time used for the initial temperature determination means 9 and the set temperature used for the temperature setting means 10 are experimentally determined in advance as optimum values.

  As described above, in the present embodiment, the initial pan bottom temperature of the pan 1 is accurately detected by using the initial temperature determination means 9 and the temperature setting means 10 via the infrared sensor 4 regardless of the temperature state of the top plate. The set temperature can be changed.

  The position of the infrared sensor 4 may be provided at the center of the coil or between the coils as long as it is provided below the top plate 2, and the number is not limited to one, and the type is not limited. .

(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a diagram showing an induction heating cooker according to Embodiment 2 of the present invention.

  Note that description of the same components and operations as those of the first embodiment is omitted.

  In the present embodiment, after heating is started, the temperature rise value of the first predetermined time is calculated from the output of the temperature detecting means 8 at every first predetermined time, and the third predetermined time from the start of heating is calculated. When the temperature rise value of one predetermined time exceeds a predetermined value, the initial temperature determination means 9 for determining that the pan bottom temperature of the pan is higher than the predetermined pan bottom temperature is set to the first predetermined time after the start of heating. When the temperature rise value for the first predetermined time is calculated from the output of the temperature detection means 8 and the temperature rise value for the first predetermined time exceeds the predetermined value within the third predetermined time from the start of heating, In the first embodiment, instead of the initial temperature determining means 9 for determining that the pan bottom temperature is higher than the predetermined pan bottom temperature, the initial temperature determining means 12 for determining that the pan bottom temperature is higher than the temperature at which infrared rays can be detected. By providing the sensitivity wave of the characteristics of the infrared sensor 4 Pan bottom temperature can be determined at a high temperature can be detected by the infrared sensor 4 using.

  After setting the determination temperature of the pan bottom temperature, the operation and the action are performed in the same manner as in the first embodiment.

  The determination temperature can be set to be lower or higher if elements having different characteristics with different sensitivity wavelengths are used in the infrared sensor 4.

  As described above, in the present embodiment, the initial temperature determining means 9 that determines that the pan bottom temperature is higher than the predetermined pan bottom temperature is the initial stage for determining that the pan bottom temperature is higher than the temperature at which infrared rays can be detected. By replacing with the temperature determination means 12, it can be determined that the pan bottom temperature is at a high temperature using the sensitivity wavelength of the infrared sensor 4.

(Embodiment 3)
The third embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a diagram showing an induction heating cooker according to Embodiment 3 of the present invention.

  Note that description of the same components and operations as those of the first embodiment is omitted.

In the present embodiment, the first set temperature higher than the stable temperature of the pan bottom is set at the start of heating so that the pan bottom temperature rises quickly in the first embodiment, and the first set temperature is reached after reaching the first set temperature. Instead of the temperature setting means 10 for setting the second set temperature lower than the temperature, the first temperature determining means 9 in the first embodiment or the initial temperature determining means 12 in the second embodiment uses the first temperature after starting heating. The first temperature rise value of the second predetermined time is calculated from the output of the temperature detection means 8 at every predetermined time, and the temperature rise value of the second predetermined time is predetermined within a third predetermined time from the start of heating. If the value exceeds the value, it is determined that the pan bottom temperature is higher than the predetermined pan bottom temperature or the pan bottom temperature is higher than the temperature at which infrared rays can be detected, and the first set temperature set in the temperature setting means 13 is determined. Lower the first setting After the temperature change, further comprising a second predetermined time to a first temperature setting means 13 to change the large second exceeds the temperature rise value of the addition the first set temperature lower than the temperature rise value. By providing the temperature setting means 13, when the second temperature rise value larger than the first temperature rise value of the second predetermined time described in the first embodiment is exceeded, the first set temperature is further lowered. be able to.

  The first temperature rise value and the second temperature rise value for the second predetermined time used for the temperature setting means 13 are experimentally determined in advance as optimum values.

  As described above, in the present embodiment, the temperature setting means 13 that further lowers the first set temperature when the second temperature rise value that is larger than the first temperature rise value for the second predetermined time is exceeded. The set temperature can be further lowered to give a more optimal first set temperature, and the temperature accuracy of the pan bottom temperature can be effectively improved.

  As described above, the induction heating cooker according to the present invention accurately detects the initial pan bottom temperature regardless of the temperature state of the top plate and changes the set temperature to give an optimal set temperature, and the temperature accuracy of the pan bottom temperature. Since the improvement can be performed effectively, it can be applied to various induction heating cookers such as home use and business use.

DESCRIPTION OF SYMBOLS 1 Pan 2 Top plate 3 Heating coil 4 Infrared sensor 5 Commercial power supply 6 Inverter circuit 7 Heating means 8 Temperature detection means 9, 12 Initial temperature determination means 10, 13 Temperature setting means 11 Control means

Claims (3)

A top plate on which the pan is placed; a heating means provided under the top plate for induction heating the pan; a temperature detecting means provided under the top plate for detecting the temperature of the pan bottom; Initial temperature determination means for determining the initial temperature of the pan based on the output of the temperature detection means, and at the start of heating so that the food contained in the pan rises quickly, is higher than the stable temperature of the pan bottom A temperature setting means for setting a first set temperature and setting a second set temperature lower than the first set temperature after reaching the first set temperature, and a temperature detected by the temperature detecting means is the temperature Control means for controlling the heating output of the heating means so as to reach the temperature set by the setting means, and the initial temperature determination means detects the temperature every first predetermined time after the start of heating. The first temperature rise value of the second predetermined time is calculated from the output of the stage, and when the temperature rise value of the second predetermined time exceeds the predetermined value within the third predetermined time from the start of heating, the pan bottom temperature is An induction heating cooker that determines that the temperature is higher than a predetermined temperature and changes the first set temperature set in the temperature setting means to be low. The initial temperature determining means calculates the first temperature rise value for the second predetermined time from the output of the temperature detecting means every first predetermined time after the start of heating, and within the third predetermined time from the start of heating. When the temperature rise value of the second predetermined time exceeds a predetermined value, the pot bottom temperature is higher than the temperature at which the infrared sensor can detect infrared rays instead of determining that the pot bottom temperature is higher than the predetermined temperature. The induction heating cooker according to claim 1, wherein it is determined that the temperature is high, and the first set temperature set in the temperature setting means is changed to be low. After the first set temperature change, further provided with a temperature setting means for changing the first set temperature further lower when a second temperature rise value larger than the first temperature rise value is exceeded at a second predetermined time. The induction heating cooker according to claim 1 or 2.

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