JP6303135B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker.

  Today, induction heating cookers detect the temperature of a cooking container such as a pan placed on the top plate with an infrared sensor installed below the top plate, and control the heating according to the detected temperature information. There is a model to be used (see, for example, Patent Document 1).

  FIG. 4 is a schematic view showing an example of a conventional induction heating cooker. This prior art will be described with reference to FIG.

  In FIG. 4, the cooking container 10 for storing the food is placed on a top plate 20 made of a nonmagnetic material. The induction heating coil 30 generates an induction magnetic field for induction heating the cooking vessel 10.

  The infrared sensor 80 includes a photodiode, receives infrared rays emitted from the cooking vessel 10 through the top plate 20, and detects temperature information of the cooking vessel 10. The power supply / control unit 50 adjusts the drive signal output to the inverter 40 according to the temperature information detected by the infrared sensor 80 and controls the high-frequency current generated by the induction heating coil 30.

  In the said structure, since the light reception sensitivity wavelength range of the infrared sensor 80 is designed to overlap with the infrared transmission wavelength range of the top plate 20, the infrared sensor 80 can detect the temperature of the cooking container 10 with good response. The power source / control unit 50 appropriately controls the temperature of the cooking container 10 based on the detection result.

JP 2005-63881 A

  However, since an infrared sensor is generally more expensive than a temperature sensor having a simple configuration such as a thermistor, one infrared heating sensor is associated with each induction heating coil in an induction heating cooker having a plurality of induction heating coils. Providing infrared sensors one by one increases the overall cost.

  When heating control is performed using an infrared sensor, a control unit configured by a microcomputer needs to convert an output signal from the infrared sensor into temperature information that can be used to control the heating output. The temperature information may be corrected according to the temperature information.

  For this reason, in order to perform complicated processing such as heating control using the current heating output and temperature information, it is necessary to previously store data necessary for the processing in the control unit.

  As a result, in each induction heating cooker that drives each induction heating coil by controlling each inverter in accordance with the output of a plurality of infrared sensors provided in association with each of the plurality of induction heating coils, In order to control the operation, an expensive microcomputer having a large storage capacity and a high processing capacity must be used as the control unit.

  The present invention is intended to solve the above-described conventional problems.

  The induction heating cooker of the present invention includes a top plate for placing a cooking container, and first and second induction heating units that are provided below the top plate and induction-heat the cooking container.

  Each of the first and second induction heating units includes a plurality of induction heating coils, a plurality of inverters that respectively drive the plurality of induction heating coils, a temperature detection unit that detects the temperature of the cooking container, and power to the inverter. A power supply / control unit that supplies and controls the inverter according to the output of the temperature detection unit.

In the induction heating cooking apparatus having fried food cooking as an automatic cooking menu, in the first induction heating unit, the temperature detection unit has a first infrared sensor which is the only infrared sensor, and the first infrared sensor is , Provided in association with the induction heating coil provided in the foremost position. In the second induction heating unit, a second infrared sensor of the temperature detection portion is the only infrared sensor, a second infrared sensor, with provided in association with the induction heating coil provided on the rearmost The power source / control unit has a function of automatic cooking for performing heating control based on a predetermined sequence, and the first induction heating unit uses the induction heating coil provided in the forefront. The fried food is cooked .
According to the present invention, a low-cost induction heating cooker that can perform high-precision heating control by temperature detection with good responsiveness despite the configuration in which heating control is performed using a more expensive infrared sensor is provided. It becomes possible. Moreover, the user can use the induction heating coil in front of the first induction heating unit for the fried food cooking in which the cooking container is frequently moved up and down.

  According to the present invention, a low-cost induction heating cooker that can perform high-precision heating control by temperature detection with good responsiveness despite the configuration in which heating control is performed using a more expensive infrared sensor is provided. It becomes possible.

FIG. 1 is a schematic diagram illustrating a configuration of the induction heating cooker according to the first embodiment. FIG. 2 is a schematic diagram illustrating a configuration of the induction heating cooker according to the second embodiment. FIG. 3 is a schematic diagram illustrating a configuration of the induction heating cooker according to the third embodiment. FIG. 4 is a schematic view of a conventional induction heating cooker.

  1st invention is provided with the top plate for mounting a cooking container, and the 1st and 2nd induction heating unit which is provided under the top plate and induction-heats a cooking container.

  Each of the first and second induction heating units includes a plurality of induction heating coils, a plurality of inverters that respectively drive the plurality of induction heating coils, a temperature detection unit that detects the temperature of the cooking container, and power to the inverter. A power supply / control unit that supplies and controls the inverter according to the output of the temperature detection unit.

In the induction heating apparatus having fried food cooking as automatic cooking, in the first induction heating unit, the temperature detection unit has a first infrared sensor which is the only infrared sensor, and the first infrared sensor is the most It is provided in association with an induction heating coil provided in front. In the second induction heating unit, a second infrared sensor of the temperature detection portion is the only infrared sensor, a second infrared sensor, with provided in association with the induction heating coil provided on the rearmost The power source / control unit has a function of automatic cooking for performing heating control based on a predetermined sequence, and the first induction heating unit uses the induction heating coil provided in the forefront. The fried food is cooked .

  According to the present invention, for example, each of the first and second induction heating units has two induction heating coils arranged on the front and rear, and the first and second induction heating units are arranged on the left and right. In the case of the induction heating cooker, in the first induction heating unit, an infrared sensor is provided only in the front induction heating coil, and in the second induction heating unit, an infrared sensor is provided only in the rear induction heating coil. .

  The user uses the induction heating coil in front of the first induction heating unit for the stir-fry cooking where the raising and lowering operation of the cooking container is frequently performed, and for the cooked cooking in which the raising and lowering operation of the cooking container is hardly performed. The induction heating coil behind the second induction heating unit may be used.

  Thus, even if it is the structure which does not necessarily provide an infrared sensor in association with all the induction heating coils, there is no practical problem. Therefore, according to the present invention, it is possible to configure a lower-cost induction heating cooker capable of highly accurate heating control by temperature detection with good responsiveness.

  According to a second invention, in the first invention, in the first induction heating unit, the infrared sensor is provided below the top plate, and in the second induction heating unit, the infrared sensor is located above the top plate, and These are provided behind the induction heating coil provided most rearward.

  According to the present invention, with respect to the second induction heating unit, since there is no top plate or the like between the infrared sensor and the cooking container, there is little possibility that infrared rays will attenuate before reaching the infrared sensor.

  In addition, regarding the second induction heating unit, since an infrared sensor is disposed further rearward of the rearmost induction heating coil, another cooking container or the like is placed between the infrared sensor and the cooking container to block infrared radiation. There is little possibility of being done.

  Therefore, according to the induction heating cooker of the present invention, more accurate temperature detection can be performed.

  According to a third invention, in the first invention, the power source / control unit has a function of automatic cooking for performing heating control based on a predetermined sequence. The first induction heating unit is provided at the forefront. Automatic cooking is performed using the induction heating coil provided, and in the second induction heating unit, automatic cooking is performed using the induction heating coil provided at the rearmost position.

  The power source / control unit is configured such that the control temperature for automatic cooking in the second induction heating unit is lower than the control temperature for automatic cooking in the first induction heating unit.

  Usually, fried cooking requires higher temperature heating than boiled cooking. According to the present invention, the cooking container is frequently moved up and down, and the stir-fry cooking that requires high-temperature heating can be performed using the induction heating coil in front of the first induction heating unit.

  With regard to the boiled cooking in which the cooking container is hardly moved up and down and is heated at a lower temperature than the fried food cooking, it can be performed using the induction heating coil at the rear of the second induction heating unit.

  Therefore, highly accurate heating control by temperature detection with good responsiveness is possible, and it is possible to configure a low-cost induction heating cooker having good operability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the following drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1)
FIG. 1 is a schematic diagram of an induction heating cooker according to a first embodiment of the present invention. With reference to FIG. 1, the structure of the induction heating cooking appliance 1 concerning this Embodiment is demonstrated. In the following description, the side closer to the user is expressed as the front side of the induction heating cooker 1, and the side far from the user is expressed as the rear side of the induction heating cooker 1.

  As shown in FIG. 1, the top plate 21 is made of an electrical insulator such as glass or ceramic, and constitutes the upper surface of the induction heating cooker 1 on which the cooking containers 11 and 12 such as a pan are placed.

  The induction heating coil 31, the induction heating coil 32, the induction heating coil 33, and the induction heating coil 34 have substantially the same shape and configuration, and are arranged in a matrix of two rows and two columns below the top plate 21. .

  The power source / control unit 51 includes a DC power source (not shown) that rectifies and smoothes power from a commercial AC power source, and supplies power to the inverter 41 and the inverter 42. The power supply / control unit 51 outputs a drive signal to the inverter 41 to control the inverter 41, and outputs a drive signal to the inverter 42 to control the inverter 42.

  The power source / control unit 52 includes a DC power source (not shown) that rectifies and smoothes power from a commercial AC power source, and supplies power to the inverter 43 and the inverter 44. The power supply / control unit 52 outputs a drive signal to the inverter 43 to control the inverter 43, and outputs a drive signal to the inverter 44 to control the inverter 44.

  The inverter 41 receives the power and drive signal from the power source / control unit 51 and drives the induction heating coil 31. The inverter 42 receives the power and drive signal from the power source / control unit 51 and drives the induction heating coil 32.

  The inverter 43 receives the electric power and the drive signal from the power source / control unit 52 and drives the induction heating coil 33. The inverter 44 receives the power and drive signal from the power source / control unit 52 and drives the induction heating coil 34.

  The infrared sensor 81 is a temperature detection unit composed of an InGaAs pin photodiode or the like, and is located near the induction heating coil 31, for example, between windings positioned between the center and the outer periphery of the annular induction heating coil 31. Provided below the gap.

  The infrared sensor 81 radiates from the cooking vessel 11 placed above the induction heating coil 31, receives infrared rays incident through the top plate 21, and outputs a voltage corresponding to the temperature of the cooking vessel 11.

  Similarly, the infrared sensor 82 is a temperature detection unit composed of an InGaAs pin photodiode or the like, and is wound in the vicinity of the induction heating coil 34, for example, between the center and the outer periphery of the annular induction heating coil 34. It is provided below the gap between the lines.

  The infrared sensor 82 receives infrared rays emitted from the cooking vessel 12 placed above the induction heating coil 34 and incident through the top plate 21, and outputs a voltage corresponding to the temperature of the cooking vessel 12.

  The advantage of using the infrared sensor is that it has better thermal response than the case where the temperature of the cooking container 11 (or 12) transmitted through the top plate 21 is detected by a thermistor or the like, and high-precision temperature control is possible.

  In the present embodiment, induction heating coils 31 and 32, inverters 41 and 42, power supply / control unit 51, and infrared sensor 81 constitute induction heating unit 61 corresponding to the first induction heating unit. .

  The induction heating coils 33 and 34, the inverters 43 and 44, the power source / control unit 52, and the infrared sensor 82 constitute an induction heating unit 62 corresponding to the second induction heating unit.

  In the induction heating unit 61, the only infrared sensor 81 is provided as a temperature detection unit. The infrared sensor 81 is provided in association with the induction heating coil 31 located in the foremost position among the induction heating coils included in the induction heating unit 61.

  In the induction heating unit 62, the only infrared sensor 82 is provided as a temperature detection unit. The infrared sensor 82 is provided in association with the induction heating coil 34 located at the rearmost among the induction heating coils included in the induction heating unit 62.

  In the present embodiment, the infrared sensor 81 corresponds to a first infrared sensor, and the infrared sensor 82 corresponds to a second infrared sensor.

  In addition, in order to detect the temperature of the cooking vessel placed above the induction heating coils 32 and 33, a temperature sensor such as a thermistor that is not an infrared sensor may be provided in association with the induction heating coils 32 and 33. . In this case, the power / control units 51 and 52 control the inverters 42 and 43, respectively, according to the output of the thermistor.

  Further, the power / control units 51 and 52 have an automatic cooking function for performing heating control based on a predetermined sequence. The power supply / control unit 51 performs automatic cooking by detecting the temperature of the cooking container 11 placed on the induction heating coil 31 with the infrared sensor 81.

  The power source / control unit 52 performs automatic cooking by detecting the temperature of the cooking container 12 placed on the induction heating coil 34 with the infrared sensor 82. Here, the control temperature of automatic cooking by the power source / control unit 52 is set to be lower than the control temperature of automatic cooking by the power source / control unit 51.

  In the present embodiment, the induction heating cooker 1 has fried food cooking and boiled food cooking as automatic cooking menus.

  The control temperature in fried food cooking is a temperature selected from 140 ° C to 230 ° C, for example. The power source / control unit 51 controls the inverter 41 according to the temperature detected by the infrared sensor 81 so that the cooking container 11 is maintained at the control temperature.

  Moreover, the control temperature in boiled food cooking is a temperature below 100 degreeC, for example. The power source / control unit 52 controls the inverter 44 according to the temperature detected by the infrared sensor 82 so that the cooking container 12 is maintained at the control temperature.

  For this reason, the user uses the induction heating coil 31 in front of the induction heating unit 61 for the fried food cooking in which the raising and lowering operation of the frying pan is frequently performed. The induction heating coil 34 behind the induction heating unit 62 may be used.

  Thus, even if it is the structure which does not necessarily provide an infrared sensor in association with all the induction heating coils, there is no practical problem. Therefore, according to the present invention, it is possible to configure a lower-cost induction heating cooker capable of highly accurate heating control by temperature detection with good responsiveness.

  In this embodiment, InGaAs pin photodiodes are used as the infrared sensors 81 and 82, but the temperature of the bottom surfaces of the cooking containers 11 and 12, such as silicon photodiodes and thermopile, can be detected by the emitted infrared rays. If it is good.

  As described above, according to the present embodiment, it is possible to perform heating control with high accuracy by temperature detection with good responsiveness, despite the configuration in which heating control is performed using an infrared sensor that is more expensive than the thermistor. It becomes possible to constitute an induction heating cooker.

(Embodiment 2)
The second embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a schematic diagram showing the configuration of the induction heating cooker according to the present embodiment.

  As shown in FIG. 2, the induction heating cooker 2 includes an induction heating unit 61 disposed on the left side and an induction heating unit 63 disposed on the right side. The induction heating unit 63 includes an induction heating coil 33, an induction heating coil 34, an inverter 43, an inverter 44, an infrared sensor 83, and a power source / control unit 52.

  The infrared sensor 83 is installed behind the induction heating coil 34 and above the top plate 21. The infrared sensor 83 receives infrared rays emitted from the cooking container 12 placed above the induction heating coil 34, and corresponds to the temperature of the cooking container 12. Output voltage.

  The power source / control unit 52 supplies power to the inverters 43 and 44 to control the inverter 43 and the inverter 44. In addition, the power source / control unit 52 detects the temperature of the cooking container 12 placed on the induction heating coil 34 by the infrared sensor 83 and performs automatic cooking for performing heating control based on a predetermined sequence.

  In the present embodiment, the infrared sensor 81 corresponds to a first infrared sensor, and the infrared sensor 83 corresponds to a second infrared sensor.

  The present embodiment is different from the first embodiment in that the infrared sensor 83 is installed behind the induction heating coil 34 and above the top plate 21.

  Since the infrared sensor 83 of the present embodiment directly receives the infrared rays emitted from the cooking container without passing through the top plate that absorbs infrared rays, the temperature can be detected with high accuracy.

  Moreover, in this Embodiment, since the infrared sensor 83 is installed in the back of the cooking container 12, ie, the far side from the user of the cooking container 12, even if it is installed above the top plate 21, the detection is carried out. Operation is less likely to be disturbed by the user.

  These two installation locations related to the infrared sensor can be properly used as follows, for example.

  Since the bottom surface of the cooking container 12 becomes higher than the side surface due to self-heating due to induction heating, the infrared sensor 82 installed below the induction heating coil 34 as shown in the first embodiment is the most suitable for the cooking container 12. It is easy to measure the temperature of the hot part. Therefore, the infrared sensor 82 of Embodiment 1 is suitable for automatic cooking at a relatively high control temperature.

  On the other hand, as shown in the present embodiment, an infrared sensor 83 installed behind the induction heating coil 34 and above the top plate 21 detects the temperature of the side surface of the cooking container 12, and therefore, in the case of the first embodiment. It is not suitable for automatic cooking at relatively high control temperatures.

  However, the infrared sensor 83 of the present embodiment is suitable for high-precision automatic cooking at a relatively low control temperature because it can detect temperature with high accuracy as described above.

  In addition, as a place of the cooking vessel 12 which detects the temperature by the infrared sensor 83, for example, a side surface where the heat of the bottom portion that is induction-heated is difficult to be transmitted, a vicinity of the boundary with the top plate 21 of the cooking vessel 12, and the like can be considered.

  In particular, at the time of heating with high heating power, the temperature of the bottom surface of the cooking vessel 12 becomes higher than the temperature of the cooked food in the cooking vessel 12 due to self-heating by induction heating.

  However, if the temperature of the side surface of the cooking container 12 is measured, the temperature can be detected relatively without being affected by the self-heating on the bottom surface of the cooking container 12, and the temperature of the cooked product can be detected with higher accuracy.

  On the other hand, the vicinity of the boundary between the cooking vessel 12 and the top plate 21 often has a curved shape. For this reason, when measuring the temperature near the boundary between the cooking container 12 and the top plate 21, when infrared rays corresponding to the ambient temperature, which is a noise component, are irradiated on this portion, most of the infrared rays of the noise component is caused by the shape. Reflected in the direction of the top plate 21.

  Since the top plate 21 has a high infrared emissivity (infrared emissivity = 1.0), the top plate 21 substantially absorbs infrared rays reflected by the cooking vessel 12. Therefore, the infrared sensor 83 does not detect the infrared ray of the noise component due to the ambient temperature, and is not significantly affected by the noise.

  Further, the infrared rays corresponding to the heat transmitted from the cooking container 12 to the top plate 21 by heat conduction partly reach the infrared sensor 83 directly from the top plate 21, and partly near the boundary between the cooking container 12 and the top plate 21. And reaches the infrared sensor 83.

  Therefore, even when using, for example, stainless steel, which has a low infrared emissivity and is detected directly at a temperature lower than that of the infrared ray that directly reaches from the cooking vessel 12 as a cooking vessel 12, it is corrected by infrared rays according to the heat transmitted to the top plate 21, The temperature of the cooking container 12 can be detected more accurately.

  As described above, in the present embodiment, for the induction heating coil 31 disposed in the front, the infrared sensor 81 is provided below the top plate 21, and for the induction heating coil 34 disposed in the rear. The infrared sensor 83 is provided above the top plate 21.

  According to the present embodiment, if the induction heating coil 31 is used, the cooking container 11 can be easily raised and lowered, and automatic cooking (for example, fried food cooking) at a relatively high control temperature can be performed.

  In addition, if the induction heating coil 34 is used, even if the infrared sensor 83 is provided above the top plate, high-precision automatic cooking at a relatively low control temperature without disturbing the temperature detection by the infrared sensor 83. (For example, boiled food cooking) can be performed.

  In the present embodiment, an InGaAs pin photodiode is used as the infrared sensor 83. However, it is only necessary that the temperature of the side surface of the cooking vessel 12 can be detected by the emitted infrared radiation, such as a silicon photodiode or a thermopile. .

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

  As shown in FIG. 3, the induction heating cooker 3 has an induction heating unit 64. The induction heating unit 64 includes an induction heating coil 31, an induction heating coil 34, an inverter 41, an inverter 44, an infrared sensor 81, an infrared sensor 83, and a power supply / control unit 53.

  The power source / control unit 53 supplies power to the inverters 41 and 44 to control the inverter 41 and the inverter 44.

  The power source / control unit 53 has an automatic cooking function that detects the temperature of the cooking container 11 placed above the induction heating coil 31 with the infrared sensor 81 and performs heating control based on a predetermined sequence. Similarly, the power source / control unit 53 has an automatic cooking function for detecting the temperature of the cooking container 12 placed above the induction heating coil 34 by the infrared sensor 83 and performing heating control based on a predetermined sequence. Have.

  In the present embodiment, the infrared sensor 81 corresponds to a first infrared sensor, and the infrared sensor 83 corresponds to a second infrared sensor.

  The present embodiment has one induction heating unit 64 including two induction heating coils 31 and 34, and infrared sensors 81 and 83 are provided in association with both induction heating coils 31 and 34, respectively. Different from the first and second embodiments.

  Therefore, in the case of the present embodiment, it is necessary to use an expensive microcomputer having a large storage capacity and a high processing capacity as the power source / control unit 53, as compared with the first and second embodiments.

  However, in the present embodiment, an infrared sensor 81 is provided below the top plate 21 for the induction heating coil 31 disposed in the front, and the top is provided for the induction heating coil 34 disposed in the rear. The second embodiment is the same as the second embodiment in that an infrared sensor 83 is provided above the plate 21.

  Therefore, as in the second embodiment, according to the present embodiment, if the induction heating coil 31 is used, the cooking container 11 can be easily raised and lowered, and automatic cooking at a relatively high control temperature (for example, fried food) Cooking).

  In addition, if the induction heating coil 34 is used, even if the infrared sensor 83 is provided above the top plate, high-precision automatic cooking at a relatively low control temperature without disturbing the temperature detection by the infrared sensor 83. (For example, boiled food cooking) can be performed.

  As described above, the present invention can be applied to an induction heating cooker for home use or business use.

1, 2, 3 Induction heating cooker 10, 11, 12 Cooking container 20, 21 Top plate 30, 31, 32, 33, 34 Induction heating coil 40, 41, 42, 43, 44 Inverter 50, 51, 52, 53 Power source / control unit 61, 62, 63, 64 Induction heating unit 80, 81, 82, 83 Infrared sensor

Claims (2)

A top plate for placing the cooking container;
A first induction heating unit and a second induction heating unit provided under the top plate for induction heating the cooking vessel,
A plurality of induction heating coils;
A plurality of inverters respectively driving the plurality of induction heating coils;
A temperature detector for detecting the temperature of the cooking container;
A first and second induction heating unit that includes a power source / control unit that supplies power to the inverter and controls the inverter according to an output of the temperature detection unit;
Equipped with a,
In an induction heating device with fried food cooking as an automatic cooking menu ,
In the first induction heating unit, the temperature detection unit includes a first infrared sensor that is the only infrared sensor, and the first infrared sensor is associated with the induction heating coil provided in the forefront. Provided,
In the second induction heating unit, the temperature detection unit includes a second infrared sensor that is the only infrared sensor, and the second infrared sensor is associated with the induction heating coil provided at the rearmost position. As well as
The power source / control unit has a function of automatic cooking for performing heating control based on a predetermined sequence. In the first induction heating unit, the induction heating coil provided at the forefront is used to cormorants line the stir-fry cooking, induction heating cooker.   In the first induction heating unit, the first infrared sensor is provided below the top plate, and in the second induction heating unit, the second infrared sensor is above the top plate, and The induction heating cooker according to claim 1, wherein the induction heating cooker is provided behind the induction heating coil provided most rearward.

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