WO2011155193A1 - Induction cooker - Google Patents

Induction cooker Download PDF

Info

Publication number
WO2011155193A1
WO2011155193A1 PCT/JP2011/003232 JP2011003232W WO2011155193A1 WO 2011155193 A1 WO2011155193 A1 WO 2011155193A1 JP 2011003232 W JP2011003232 W JP 2011003232W WO 2011155193 A1 WO2011155193 A1 WO 2011155193A1
Authority
WO
WIPO (PCT)
Prior art keywords
integrated power
pan
heating
inverter circuit
output voltage
Prior art date
Application number
PCT/JP2011/003232
Other languages
French (fr)
Japanese (ja)
Inventor
輝雄 林中
新太郎 野口
史太佳 小笠原
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2012519252A priority Critical patent/JPWO2011155193A1/en
Publication of WO2011155193A1 publication Critical patent/WO2011155193A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the present invention relates to an induction heating cooker having a scoring detection function.
  • the induction heating cooker described in Patent Document 1 includes a scorching detection unit that stops cooking when the temperature at the bottom of the pan rises to a predetermined value or more during cooking. Therefore, it is possible to prevent the liquid from running out during cooking and cooking from scorching the pan.
  • the induction heating cooker described in Patent Document 2 determines whether the cooked product has burned into the cooking container based on the temperature gradient of the temperature of the cooking container.
  • Japanese Patent Laid-Open No. 10-149875 Japanese Patent Laid-Open No. 2007-115515. JP 2001-357968 A. International Publication No. 2007/088931 Pamphlet.
  • the burn-in detection unit is provided for detecting burn-in during stew cooking, so that when the user uses the burn-in detection function, the user can use it for stew cooking. It has been necessary to perform a predetermined operation for operating the burnt detection unit, such as selecting a corresponding specific cooking mode (for example, a stew mode).
  • a predetermined operation for operating the burnt detection unit such as selecting a corresponding specific cooking mode (for example, a stew mode).
  • a corresponding specific cooking mode for example, a stew mode.
  • the induction heating cooker of Patent Document 2 performs scoring detection regardless of cooking contents, scoring may be erroneously detected and the heating output may be reduced when it is not necessary to detect scoring.
  • An object of the present invention is to solve the above-mentioned problems and to provide an induction heating cooker capable of operating or stopping a burn detection function without imposing a predetermined operation for detecting burn on, such as selection of a cooking mode. It is to provide.
  • An induction heating cooker includes a top plate on which a pan is placed, an induction heating coil that is provided below the top plate and induction-heats the pan, and an inverter that supplies a high-frequency current to the induction heating coil
  • a circuit an infrared sensor for detecting infrared radiation radiated from the bottom of the pan and passing through the top plate and outputting an output voltage corresponding to the bottom temperature of the pan, and heating from one of a plurality of heating output set values
  • An output setting unit for selecting an output set value; and an operation of the inverter circuit so as to supply a high frequency current to the induction heating coil and the heating output becomes a heating output corresponding to the selected heating output set value.
  • burn information indicating that the cooked food has burned to the bottom of the pan A burn-out detection unit that generates a signal and outputs it to the control unit, and an integrated power measurement unit that measures an integrated power of the power input to the inverter circuit, and the control unit starts the operation so as to start the operation
  • the integrated power measuring unit is controlled to start measuring the integrated power, and when the integrated power measured by the integrated power measuring unit reaches a predetermined threshold integrated power,
  • the inverter circuit is controlled to stop the heating operation or reduce the heating output in response to the burned information signal.
  • the output voltage is equal to or higher than the second output voltage, it is prohibited to control the inverter circuit in response to the burn information signal.
  • cooking is performed in a normal heating mode in which the heating output set value can be changed without imposing a predetermined operation such as selection of a specific cooking mode or selection of a predetermined function for preventing burning.
  • a burn detection function (a function for controlling an inverter circuit in response to a burn information signal) can be used.
  • the heating output set value is changed during cooking, for example, when the cooking content is fried food, the cooking content is mistakenly determined to be boiled food, and the scorching detection function is not necessary in the scene where the scoring detection function is unnecessary. I don't work.
  • the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
  • the burn-in detection function is operated or stopped without imposing a predetermined operation on the user such as selection of a specific cooking mode or selection of a predetermined function for preventing burn-in. It is possible and does not detect scoring accidentally during cooking.
  • FIG. 3 is a circuit diagram showing configurations of a rectifying / smoothing circuit 93 and an inverter circuit 8 in FIG. 2.
  • A) is a graph showing the relationship between the elapsed time from the start of heating and the output voltage VT from the infrared sensor 11 in FIG. 2, and (b) shows the relationship between the elapsed time from the start of heating and the integrated power P.
  • the first invention includes a top plate for placing a pan, an induction heating coil provided under the top plate and for induction heating the pan, an inverter circuit for supplying a high frequency current to the induction heating coil, An infrared sensor that detects infrared rays radiated from the bottom of the pan and passes through the top plate and outputs an output voltage corresponding to the bottom temperature of the pan, and one heating output setting value from a plurality of heating output setting values An output setting unit for selecting, and a control unit for supplying a high-frequency current to the induction heating coil and controlling the operation of the inverter circuit so that the heating output becomes a heating output corresponding to the selected heating output setting value And when the output voltage of the infrared sensor is equal to or higher than a predetermined first output voltage, a burned information signal is generated to indicate that the cooked food has burned to the bottom of the pan.
  • a burn-out detection unit that outputs to the control unit, and an integrated power measurement unit that measures the integrated power of the power input to the inverter circuit, and the control unit controls the inverter circuit to start operation
  • the integrated power measuring unit is controlled to start measuring the integrated power, and when the integrated power measured by the integrated power measuring unit reaches a predetermined threshold integrated power, the output voltage is When the output voltage is less than a predetermined second output voltage lower than the output voltage, the inverter circuit is controlled to stop the heating operation or reduce the heating output in response to the burned information signal, while the output voltage is When the voltage is equal to or higher than the second output voltage, it is prohibited to control the inverter circuit in response to the burned information signal.
  • cooking is performed in a normal heating mode in which the heating output set value can be changed without imposing a predetermined operation such as selection of a specific cooking mode or selection of a predetermined function for preventing burning.
  • a burn detection function (a function for controlling an inverter circuit in response to a burn information signal) can be used.
  • cooking contents that do not require a burn-in detection function for example, fried food
  • cooking that requires a burn-in detection function are more accurate than conventional techniques. Since the contents (for example, boiled food) can be discriminated, even if the heating output set value is changed during cooking, for example, when the cooking contents are fried food, the cooking contents are mistakenly determined to be boiled food.
  • the scoring detection function works in situations where the scoring detection function is unnecessary, and does not hinder cooking. Also, when the cooking content is boiled food, it is mistakenly determined that the cooking content is fried food, and there is no case that the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
  • control unit sets the threshold integrated power so that the threshold integrated power decreases as the selected heating output set value increases. It is characterized by doing.
  • the heating output set value is changed during cooking, for example, it is possible to distinguish between fried food and boiled food.
  • the cooking content is fried food
  • the cooking content is boiled food.
  • the scoring detection function works in situations where the scoring detection function is unnecessary and the scoring detection function is unnecessary, so that cooking is not hindered.
  • the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
  • a measurement unit that measures the input current input to the inverter circuit and the resonance voltage of the inverter circuit, and the measured input current and resonance voltage
  • a pan type discriminating unit for discriminating the material of the pan and the control unit increases the threshold value as the thermal conductivity of the material of the pan discriminated by the pan type discriminating unit increases.
  • the threshold integrated power is set so as to increase the power.
  • the integrated power threshold according to the characteristics of the pan, it is possible to distinguish, for example, fried food and boiled food with high accuracy regardless of the material of the pot.
  • the cooking content is fried food
  • the cooking content is mistakenly determined to be boiled food, and the burning detection function works in situations where the burning detection function is unnecessary, so that cooking is not hindered.
  • the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
  • the pan type discriminating unit is configured so that the difference between the measured input current and a preset first current value, and the measured resonance voltage The material of the pan is determined based on the difference from the set first voltage value.
  • the present invention has the same effects as the third invention.
  • control unit when the selected heating output set value is higher than a predetermined heating output set value, the control unit is configured to provide the burned information. Controlling the inverter circuit in response to a signal is prohibited, and the integrated power measuring unit is controlled to continue the measurement of the integrated power.
  • the measurement unit that measures the input current input to the inverter circuit and the resonance voltage of the inverter circuit, and the measurement A panless detector that determines whether or not the pan is on the top plate based on an input current and a resonance voltage, and the control unit is placed on the top plate by the panless detector.
  • the integrated power measuring unit is controlled to initialize the integrated power.
  • the burn detection function can be used accurately. it can.
  • the no-pan detector detects the difference between the measured input current and a preset second current value, and the measured resonance voltage in advance. Based on a difference from the set second voltage value, it is determined whether or not the pan is on the top plate.
  • the present invention has the same effects as the sixth invention.
  • the threshold integrated power is obtained when the cooking content of the induction heating cooker is fried food.
  • the second output voltage is the output voltage when the accumulated power becomes the threshold integrated power when the cooking content is boiled food.
  • the output power is set to an output voltage lower than the output voltage when the integrated power reaches the threshold integrated power.
  • FIG. 1 is a perspective view showing the configuration of the induction heating cooker according to the first embodiment of the present invention.
  • a top plate 2 made of an electrical insulator such as glass and transmitting infrared rays is provided on an upper portion of an outer case 1.
  • the top plate 2 is provided with an induction heating unit 3 that induction-heats the pan 12 that is a cooking container by induction heating, and a radial heater unit 4 that heats a nonmetallic pan or the like by radiant heat.
  • a grill 5 for grilling fish and the like, and an operation display unit 6 for operating each heat source and displaying the state of each heat source are provided on the side surface of the outer case 1.
  • the induction heating cooker is (A) the top plate 2 on which the pan 12 is placed; (B) a heating coil 7 provided under the top plate 2 and for induction heating the pan 12; (C) an inverter circuit 8 for supplying a high-frequency current to the heating coil 7; (D) an infrared sensor 11 that detects infrared rays radiated from the bottom of the pan 12 and transmits the top plate 2 and outputs an output voltage VT corresponding to the bottom temperature of the pan 12; (E) an output setting unit 10 for selecting one heating output setting value WH from a plurality of heating output setting values; (F) a control unit 9 that supplies a high-frequency current to the heating coil 7 and controls the operation of the inverter circuit 8 so that the heating output becomes a heating output corresponding to the selected heating output set value WH; (G) When the output voltage VT of the infrared sensor 11 is equal to or higher than the predetermined output voltage V1, the burned information signal SB
  • control unit 9 controls the integrated power measuring unit 15 so as to start measuring the integrated power P when the inverter circuit 8 is controlled so as to start the operation, and the integrated power measured by the integrated power measuring unit 15 is controlled.
  • the power P reaches the predetermined threshold integrated power PT
  • the output voltage VT is less than the predetermined output voltage V2 lower than the output voltage V1
  • the heating operation is stopped in response to the burned information signal SB or
  • the inverter circuit 8 is controlled so as to reduce the heating output.
  • the output voltage VT is equal to or higher than the output voltage and V2 or higher, it is prohibited to control the inverter circuit 8 in response to the burned information signal SB. It is said.
  • FIG. 2 is a block diagram showing a configuration of the induction heating unit 3 of FIG.
  • the induction heating unit 3 includes an induction heating coil 7 (hereinafter referred to as a heating coil 7) provided below the top plate 2, an infrared sensor 11, an inverter circuit 8, a commercial AC power supply 91, A rectifying / smoothing circuit 93, an input current detection circuit 92, an integrated power measurement unit 15, a scoring detection unit 13, and a control unit 9 are configured.
  • the operation display unit 6 includes a heating start switch 6 s and an output setting unit 10.
  • the heating start switch 6s is provided for the user to instruct the induction heating unit 3 to start heating, and when operated by the user, outputs a signal indicating the start of heating to the control unit.
  • the output setting unit 10 is provided for the user to select the heating output setting value of the induction heating coil 7 from a plurality of heating output setting values, and controls the heating output setting value WH selected by the user. To the unit 9.
  • the infrared sensor 11 is made of an InGaAs pin photodiode or the like, and is provided in the vicinity of the heating coil 7 below the top plate 2.
  • the infrared sensor 11 detects the amount of infrared rays that are radiated from the bottom of the pan 12 that is a cooking vessel and passes through the top plate 2, and outputs the output voltage VT corresponding to the bottom temperature of the pan 12 based on the detected amount of infrared rays. Generated and output to the control unit 9 and the burning detection unit 13.
  • FIG. 5 is a flowchart showing the burn detection process executed by the burn detection unit 13 of FIG.
  • step S60 of FIG. 5 the burn detection unit 13 determines whether or not the output voltage VT is equal to or higher than a predetermined output voltage V1, and proceeds to step S61 if YES, while processing in step S60 if NO. Execute repeatedly.
  • step S61 the burn detection unit 13 outputs a burn information signal SB indicating that the pan 12 has burned to the control unit 9 and ends the burn detection process.
  • the output voltage V1 corresponds to the temperature at which the cooked product 14 burns into the pan 12 when the cooked product 14 having a relatively high viscosity such as curry is boiled (that is, when the cooking content is cooked).
  • Output voltage VT to be set.
  • FIG. 3 is a circuit diagram showing the configuration of the rectifying / smoothing circuit 93 and the inverter circuit 8 of FIG.
  • a rectifying / smoothing circuit 93 includes a diode bridge circuit and full-wave rectifies an AC voltage from a commercial AC power supply 91 to convert it into a DC voltage, and a first output of the full-wave rectifier 94.
  • a choke coil 95 having one end connected to the terminal, and a smoothing capacitor 96 having one end connected to the second output terminal of the full-wave rectifier 94 and the other end connected to the other end of the choke coil 95. Configured.
  • the choke coil 95 and the smoothing capacitor 96 constitute a low-pass filter.
  • the inverter circuit 8 is connected between a resonance capacitor 81 having one end connected to each other end of the choke coil 95 and the smoothing capacitor 96, and between the other end of the smoothing capacitor 96 and the other end of the resonance capacitor 81.
  • the switching element 83 includes a switching element 83 and a diode 82 connected in antiparallel to the switching element 83.
  • the heating coil 7 is connected to the resonance capacitor 81 in parallel.
  • a current detection circuit 92 is provided.
  • the input current detection circuit 92 is, for example, a current transformer (CT (Current Transformer)).
  • CT Current Transformer
  • the switching element 83 is on / off controlled by the control unit 9, whereby a high frequency current flows through the heating coil 7. And a high frequency magnetic field generate
  • the integrated power measurement unit 15 measures the integrated power P input to the inverter circuit 8 by integrating the input current detected by the input current detection circuit 92, and the measured integrated power P Is output to the control unit 9.
  • the integrated power measuring unit 15 initializes the integrated power P to zero based on the control from the control unit 9 and starts measurement.
  • the control unit 9 allows the user to change the heating output set value WH so that the heating output becomes a heating output corresponding to the heating output set value WH selected by the output setting unit 10. It has a heating mode in which the switching element 83 is on / off controlled. Further, the control unit 9 performs the heating process of FIG. 4 using the burnt information signal SB from the burnt detection unit 13, the output voltage VT from the infrared sensor 11, and the accumulated power P from the accumulated power measuring unit 15. To do.
  • FIG. 4 is a flowchart showing the heating process executed by the control unit 9 of FIG.
  • step S10 of FIG. 4 when the power of the induction heating cooker is turned on, the control unit 9 sets the operation mode to the standby mode. The control unit 9 stops the heating operation in the standby mode, and the user can operate the heating start switch 6s and set the heating output set value WH by the output setting unit 10.
  • step S11 the controller 9 determines whether or not the heating start switch 6s has been operated. If YES, the process proceeds to step S12. If NO, the process of step S11 is repeated.
  • step S ⁇ b> 12 the control unit 9 starts the heating operation in the heating mode, and controls the integrated power measuring unit 15 so as to start measuring the integrated power P to the inverter circuit 8.
  • the integrated power measurement unit 15 starts integrating the integrated power P after initializing the integrated power P to zero.
  • the integrated power measurement unit 15 always measures the integrated power P and outputs it to the control unit 9 at least during the heating operation.
  • step S ⁇ b> 13 the control unit 9 controls the infrared sensor 11 to start outputting the output voltage VT corresponding to the temperature of the pan 12.
  • the infrared sensor 11 starts outputting the output voltage VT corresponding to the temperature of the pan 12.
  • the infrared sensor 11 always outputs the output voltage VT to the control unit 9 at least during the heating operation.
  • step S14 the control unit 9 sets the threshold integrated power PT to a predetermined integrated power P1.
  • step S15 it is determined whether or not the integrated power P is greater than or equal to the threshold integrated power PT. If YES, the process proceeds to step S16. If NO, the process of step S15 is repeated.
  • step S16 the control unit 9 determines whether or not the output voltage VT is equal to or higher than the predetermined output voltage V2, and if YES, the cooking content is determined to be a fried food and the process proceeds to step S19. If NO, the cooking content is determined to be boiled and the process proceeds to step S17.
  • the processing in steps S14 to S16 is cooking content determination processing for determining whether the cooking content is a fried food or a boiled food based on the integrated power P and the output voltage VT.
  • step S19 the control unit 9 prohibits the control of the inverter circuit 8 in response to the burned information signal SB (that is, without executing the process of step S18), continues the heating operation, and performs the heating process.
  • step S17 the control unit 9 determines whether or not the burnt information signal SB is input from the burnt detection unit 13, and proceeds to step S18 if YES, and repeats the process of step S17 if NO. And execute.
  • step S18 the control part 9 controls the inverter circuit 8 so that a heating operation may be stopped or a heating output may be reduced, and a heating process is complete
  • the content of the process in step S18 is determined by the extent of the damage which the pan 12 receives by scoring based on the heating output setting value WH.
  • FIG. 6 (a) is a graph showing the relationship between the elapsed time from the start of heating and the output voltage VT from the infrared sensor 11 in FIG. 2, and (b) is the elapsed time from the start of heating and the integrated power P. It is a graph which shows the relationship.
  • the output voltage VT at the timing T1 at which the integrated power P becomes the integrated power P1 in the output voltage curve C1 when the cooking content is the fried food and the burn is generated is the output voltage VT.
  • V4 (V4 ⁇ V1).
  • the output voltage VT at the timing T1 is the output voltage V3 (V3 ⁇ V4).
  • the integrated power P1 is set so that the time from the start of measurement of the integrated power P until it is determined as YES in the determination process in step S15 is, for example, a time from 100 seconds to 200 seconds. That is, the integrated power P1 is set to the integrated power P before the food 14 is burnt on the bottom of the pan 12 when the cooking content by the induction heating cooker is fried, and the output voltage V2 is the cooking content.
  • a low output voltage VT is set.
  • the cooking content is fried food
  • the cooking content is a fried food
  • the heating operation is stopped or the heating output is reduced based on the burnt information signal S13. Therefore, the inverter based on the burned information signal SB according to the cooking content (boiled or fried) without imposing a predetermined operation on the user to automatically detect burnt such as selection of the cooking mode.
  • the control of the circuit 8 (the process of step S18) can be executed or prohibited. For this reason, heating is not stopped unnecessarily or the heating output is not weakened at the time of cooking the stir-fried food, so that the usability can be improved as compared with the prior art. Moreover, since the cooking content is determined using the integrated power P, the cooking content can be determined regardless of the heating output set value WH.
  • the cooking content is a fried food or a boiled food based on the output voltage VT of the infrared sensor 11 when the integrated power P reaches a predetermined integrated power P1.
  • the invention is not limited to this.
  • it may be determined whether the cooking content is a fried food or a boiled food based on the integrated power P when the output voltage VT reaches a predetermined output voltage.
  • FIG. 7 is a flowchart showing the heat treatment according to the second embodiment of the present invention.
  • the processes in steps S10 to S13 are the same as the processes in steps S10 to S13 of the heating process (see FIG. 4) according to the first embodiment, and thus the description thereof is omitted.
  • the heat treatment according to the present embodiment is characterized in that the threshold integrated power PT is set such that the threshold integrated power PT decreases as the selected heating output set value WH increases. Further, when the selected heating output setting value WH is higher than a predetermined heating output setting value (2000 W in this embodiment), it is prohibited to control the inverter circuit 8 in response to the burned information signal SB.
  • the integrated power measuring unit 15 is controlled so as to continue the measurement of the integrated power P.
  • step S14 the control unit 9 determines whether or not the heating output set value WH is higher than 2000 W. If YES, the process proceeds to step S19, and if NO, step S30. Proceed to In step S19, the control unit 9 prohibits the control of the inverter circuit 8 in response to the burned information signal SB (that is, without executing the process of step S18), and continues the heating operation. Proceed to S41. At this time, the control unit 9 does not stop the operation of the integrated power measurement unit 15 (that is, controls the integrated power measurement unit 15 so as to continue the measurement of the integrated power P). It is determined whether or not the output set value WH has been changed. If YES, the process returns to step S40. If NO, the process of step S41 is repeated.
  • FIG. 8 is a flowchart showing the cooking content determination process in step S30 of FIG.
  • the controller 9 determines whether or not the heating output set value WH is higher than 1500 W. If YES, the process proceeds to step S35, and if NO, the process proceeds to step S32.
  • step S32 the controller 9 determines whether or not the heating output set value WH is lower than 1500 W. If YES, the process proceeds to step S34, and if NO, the process proceeds to step S33.
  • the threshold integrated power PT is set to a predetermined integrated power P1 in step S33, and when the heating output set value WH is equal to 1500 W, the threshold integrated power is set in step S34.
  • the power PT is set to a predetermined integrated power P3, and when the heating output set value WH is higher than 1500 W, the threshold integrated power PT is set to the predetermined integrated power P2 in step S35.
  • step S36 the control unit 9 determines whether or not the integrated power P is greater than or equal to the threshold integrated power PT. If YES, the process proceeds to step S39. If NO, the process proceeds to step S38. In step S38, the control unit 9 determines that the cooking content is boiled food and returns to step S21 in FIG. In step S39, the control unit 9 determines that the cooking content is fried food and returns to step S21 in FIG.
  • the integrated powers P1, P2, and P3 are set so that P2 ⁇ P1 ⁇ P3.
  • step S17 the control unit 9 determines whether or not the burn information signal SB is input from the burn detection unit 13.
  • step S18 the control unit 9 controls the inverter circuit 8 so that a heating operation may be stopped or a heating output may be reduced, and a heating process is complete
  • FIG. 9 is a graph showing an example of the relationship between the elapsed time from the start of heating and the heating output set value WH when the heating process of FIG. 7 is executed, and (b) is the heating process of FIG. 5 is a graph showing an example of the relationship between the elapsed time from the start of heating and the threshold integrated power PT when the is executed, and a graph showing an example of the relationship between the elapsed time and the integrated power P.
  • FIG. 9A when the heating output set value WH is changed from 1500 W to 2000 W, and further changed to 1000 W, the threshold integrated power PT is integrated power as shown in FIG. 9B. It is changed from P1 to integrated power P2, and further to integrated power P3.
  • the smaller the heating output set value WH the greater the heat loss due to the relationship with the heat dissipation rate. Therefore, as compared with the case where the heating output set value WH is large, the temperature increase width is small even with the same integrated power. That is, as the heating output set value WH is smaller, the integrated power PT that is input until the pan 12 is burnt becomes larger.
  • the threshold integrated power PT is set to the integrated power P3
  • the heating output set value WH is 1500 W.
  • the threshold integrated power PT is set to the integrated power P1
  • the threshold integrated power PT is set to the integrated power P2.
  • the cooking content can be judged with high accuracy.
  • the cooking content determination process of FIG. 8 even if the heating output set value WH is changed during the heating process, the threshold integrated power PT is based on the changed heating output set value WH. Set again. For this reason, even when the rate of temperature increase at the bottom of the pan 12 greatly changes with the change of the heating output set value WH during cooking, the cooking content can be determined with high accuracy compared to the first embodiment, It is possible to execute the control based on the burnt information signal SB only during the cooking of the simmered food, without causing the burning in the fried food to be erroneously detected and causing the processing of step S18 to be hindered.
  • the control of the inverter circuit 8 is prohibited in response to the burned information signal SB (that is, without performing the process of step S18), and the heating operation is continued. Therefore, when a heavy fried food with a high heating power is required, it is possible to prevent scorching from being accidentally detected and affect cooking. Then, when the heating output set value WH is changed to 2000 W or less, the cooking content determination process is executed.
  • the cooking is performed by firstly frying with high heating power and then changing to low heating power (for example, meat potato)
  • the burn-in detection function (the function of controlling the inverter circuit 8 in response to the burn-in information signal SB) such as changing the cooking mode or operating the burn-in prevention switch is operated. Control of the inverter circuit 8 based on the burned information signal SB can be performed without imposing an operation for switching whether or not the user is on.
  • control of the inverter circuit 8 based on the burnt detection information signal SB can be executed when the cooking content is boiled food. Furthermore, irrespective of the heating output set value WH, it can be determined with high accuracy whether the cooking content is a fried food or a boiled food compared to the first embodiment. Further, even if the heating output set value WH is changed during cooking, it can be determined with high accuracy whether the cooking content is a fried food or a boiled food compared to the first embodiment. Further, the control of the inverter circuit 8 based on the burnt information signal SB is not performed during the cooking of the fried food, and the control based on the burnt information signal SB can be executed during the cooking of the boiled food.
  • the threshold integrated power PT when the heating output set value WH is 1000 W, the threshold integrated power PT is set to the integrated power P3, and when the heating output set value WH is 1500 W, the threshold integrated power PT is set.
  • the threshold integrated power PT is set to the integrated power P2.
  • the present invention is not limited to this, and the heating output set value WH is increased.
  • the threshold integrated power PT may be set small so that the threshold integrated power PT becomes small.
  • FIG. 10 is a block diagram showing a configuration of an induction heating unit 3A according to the third embodiment of the present invention.
  • the induction heating unit 3A according to the present embodiment includes an input current input to the inverter circuit 8 and a resonance voltage measurement unit 16 of the inverter circuit 8 resonance voltage, A pan type discriminating unit 17 for discriminating the material of the pan 12 based on the measured input current and resonance voltage is further provided, and a control unit 9A is provided instead of the control unit 9.
  • the control unit 9A sets the threshold integrated power PT so that the threshold integrated power PT increases as the thermal conductivity of the material of the pan 12 determined by the pot type determining unit 17 increases. It is a feature.
  • the measurement unit 16 detects an input current from the commercial AC power supply 91 to the rectifying / smoothing circuit 93 using an input current detection circuit 92 that is, for example, a current transformer, and, for example, a measurement transformer (VT ( Voltage Transformer)) is used to detect the resonance voltage of the resonance capacitor 81 (see FIG. 3) of the inverter circuit 8, and a signal indicating the detected input current and resonance voltage is output to the pot type discrimination unit 17. Further, the pot type discriminating unit 17 determines the difference between the detected input current and the preset first current value, and the difference between the detected resonance voltage and the preset second voltage value.
  • VT Voltage Transformer
  • the material of the pan 12 is discriminated, and a pan type discrimination signal SB indicating the discrimination result is generated and output to the control unit 9A.
  • the pan type discriminating unit 17 discriminates the material of the pan 12 based on the characteristic of the resonance voltage with respect to the input current, similarly to the induction heating cooker described in Patent Document 3 or 4.
  • FIG. 11 is a flowchart showing the heating process executed by the control unit 9A of FIG.
  • the heat treatment of FIG. 10 is characterized by including the processes of steps S20 and S14A instead of the process of step S14, as compared with the heat treatment of FIG.
  • the control unit 9A determines a correction value ⁇ P for the threshold integrated power PT based on the pan type determination signal SP. Specifically, the correction value ⁇ P is determined so that the correction value ⁇ P increases as the thermal conductivity of the material of the pot 12 increases, and the correction value ⁇ P decreases as the thermal conductivity of the material of the pot 12 decreases.
  • step S14A the control unit 9A adds the correction value ⁇ P1 to the integrated power P1, sets the integrated power after the addition to the threshold integrated power PT, and proceeds to step S15.
  • the amount of heat generated in the pan 12 is relatively large and the gradient of the output voltage VT tends to be small. is there.
  • the material of the pan 12 has a relatively low thermal conductivity such as non-magnetic stainless steel, the amount of heat generated in the pan 12 to the surroundings is relatively small, and the gradient of the output voltage VT becomes large. Tend. For this reason, compared with the case where the material of the pan 12 is aluminum, it is difficult to discriminate cooking contents. According to this embodiment, since the threshold integrated power PT is set according to the thermal conductivity of the material of the pan 12, cooking is performed with higher accuracy than the first embodiment regardless of the material of the pan 12.
  • the burn information is not detected during the cooking of the stir-fry, and the processing of step S18 is not performed and the cooking is not hindered.
  • the burn information signal SB only during the cooking of the boiled food. Control based on can be executed.
  • the measurement unit 16 detects the resonance voltage of the resonance capacitor 81, but the present invention is not limited to this, and the resonance voltage may be detected by detecting the resonance current of the resonance capacitor 81. Moreover, the measurement part 16 should just be able to detect the electric current input into the inverter circuit 8, and the resonant voltage of the inverter circuit 8. FIG.
  • FIG. 12 is a graph showing the configuration of the configuration of the induction heating unit 3B according to the fourth embodiment of the present invention.
  • the induction heating unit 3B according to the present embodiment has a measurement unit 16 similar to the measurement unit 16 of the induction heating cooker according to the third embodiment, as compared to the induction heating unit 3 according to the first embodiment.
  • the control unit 9B controls the integrated power measuring unit 15 to initialize the integrated power P when the panless detecting unit 18 determines that there is no pan 12 on the top plate 2. It is said.
  • the measurement part 16 is comprised similarly to the measurement part 16 of the induction heating cooking appliance which concerns on 2nd Embodiment, for example, from the commercial alternating current power supply 91 using the input current detection circuit 92 which is a current transformer.
  • the input current input to the rectifying and smoothing circuit 93 is detected, and the resonance voltage of the resonance capacitor 81 (see FIG. 3) of the inverter circuit 8 is detected using, for example, a measurement transformer, and the detected input current and A signal indicating the resonance voltage is output to the panless detector 18.
  • the no pan detection unit 18 determines the difference between the detected input current and the preset second current value, and the difference between the detected resonance voltage and the preset second voltage value.
  • panless detection signal SN indicating the detection result is generated and output to the control unit 9B.
  • the resonance voltage rises sharply with respect to the input current as compared with when the pan 12 is present.
  • the panless detector 18 determines the presence or absence of the pan 12 using the difference in the resonance voltage characteristics between when the pan 12 is present and when it is absent (see, for example, Patent Document 3).
  • the control unit 9 When the control unit 9 inputs the no pan detection signal SN indicating that there is no pan 12 when the heating process of FIG. 4 is being performed, the control unit 9 initializes the integrated power P to zero and restarts the measurement of the integrated power P. Thus, the integrated power measuring unit 15 is controlled, and the process proceeds to step S14. Therefore, the induction heating cooker according to the present embodiment operates as follows, for example.
  • step S16 of FIG. 4 When it is determined in step S16 of FIG. 4 that the cooking content is fried food, the user moves the pan 12 away from the top plate 2 and places the same pan 12 on the top plate 2 again. In this case, when the pan 12 is separated from the top plate 2, a panless detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. Then, it is determined in step S15 that the integrated power P does not reach the threshold integrated power PT and cooking is completed, or in step S16, the cooking content is a fried food. For this reason, since the control of the inverter circuit 8 based on the burned information signal SB (the process of step S18) is not executed, the user can continue cooking the fried food with the selected heating output set value WH.
  • step S16 of FIG. 4 When it is determined in step S16 of FIG. 4 that the cooking content is boiled food, the user moves the pan 12 away from the top plate 2 and places the same pan 12 on the top plate 2 again. In this case, when the pan 12 is separated from the top plate 2, a panless detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. Then, the determination process of step S15 is repeatedly executed.
  • the integrated power P1 in step S14 is set so that the time from the start of measurement of integrated power P to YES in the determination process in step S15 is, for example, 100 seconds to 200 seconds.
  • step S16 of FIG. 4 After it is determined in step S16 of FIG. 4 that the cooking content is fried food, the user moves the pan 12 away from the top plate 2 and places another pan 12 for cooking the stew on the top plate 2.
  • the no pan detection signal SN indicating that there is no pan 12 is generated.
  • the integrated power P is initialized to zero, and the process returns to step S14.
  • the burnt information signal SB is generated, control of the inverter circuit 8 based on the burnt information signal SB (processing in step S18) is executed.
  • step S16 of FIG. 4 After it is determined in step S16 of FIG. 4 that the cooking content is boiled food, the user separates the pan 12 from the top plate 2 and puts another pan 12 for cooking the fried food on the top plate 2.
  • the no pan detection signal SN indicating that there is no pan 12 is generated.
  • the integrated power P is initialized to zero, and the process returns to step S14.
  • the control of the inverter circuit 8 based on the burned information signal SB step S18
  • the user can cook the fried food with the selected heating output set value WH.
  • the panless detection signal SN indicating that there is no pan 12 is generated and the integrated power P is initialized.
  • the integrated power measurement unit 15 may be controlled so that the integrated power P is initialized to zero and the measurement of the integrated power P is restarted.
  • the integrated power measuring unit 15 starts measuring the integrated power P based on the control from the control unit 9, 9A or 9B, but the present invention is not limited to this.
  • the integrated power measuring unit 15 is configured to start measuring the integrated power P in response to the no pan detection signal SN indicating that there is the pan 12. Also good.
  • the infrared sensor 11 is an InGaAs pin photodiode.
  • the present invention is not limited to this, and a temperature range including a temperature at which scorching occurs, such as a silicon photodiode or a thermopile, uses infrared rays. Any element that can be detected may be used.
  • the infrared sensor 11 was provided in the vicinity of the heating coil 7, this invention is not restricted to this, What is necessary is just to be provided in the position which can detect the temperature of the pan 12.
  • the integrated power measuring unit 15 measures the integrated power P by integrating the current input to the rectifying and smoothing circuit 93.
  • the present invention is not limited to this, and the input current to the inverter circuit 8 and the heating coil 7 are measured.
  • the integrated power P of the power input to the inverter circuit 8 may be measured by detecting every unit time and integrating the detected current and / or voltage per unit time.
  • the threshold integrated power PT may be corrected so that the threshold integrated power PT decreases as the output voltage VT of the pan 12 at the start of heating increases.
  • the induction heating cooker it is possible to detect scoring without imposing a predetermined operation on the user such as selection of a specific cooking mode or selection of a predetermined function for preventing scorching.
  • the function can be activated or deactivated and does not falsely detect scorching during cooking. For this reason, by determining the cooking scene (cooking content) desired by the user based on the heating output setting value selected by the user, for example, in the cooking of boiled food, the scoring detection function operates properly and cooking such as fried food is performed. Then, it is possible to eliminate false detection of the burn-in detection function, and it can also be applied to a determination method for preventing overheating during heating.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

Disclosed is an induction cooker provided with a control unit (9) for restricting the high-frequency current outputted from an inverter circuit (8), a burn detection unit (13) for outputting, to the control unit (9), a burn information signal (SB) indicating that food (14) burned and stuck to the bottom of a pot (12) when the output voltage (VT) of an infrared sensor (11) reaches output voltage (V1), and an accumulative power measuring unit (15) for measuring the accumulative power (P) inputted to the inverter circuit (8), wherein the control unit (9) prohibits the inverter circuit (8) to be controlled in response to the burn information signal (SB) when the accumulative power (P) reaches a threshold accumulative power (PT) and when the output voltage (VT) is greater than or equal to output voltage (V2).

Description

誘導加熱調理器Induction heating cooker
　本発明は、焦げ付き検知機能を備えた誘導加熱調理器に関する。 The present invention relates to an induction heating cooker having a scoring detection function.
　特許文献１記載の誘導加熱調理器は、煮込み調理中に鍋底の温度が予め定めた所定値以上に上昇した場合に煮込み加熱を停止する焦げ付き検知部を備えている。従って、煮込み調理中に液体がなくなって調理物が鍋に焦げ付くことを防止できる。また、特許文献２記載の誘導加熱調理器は、調理容器の温度の温度勾配に基づいて調理物が調理容器に焦げ付いたか否かを判断する。 The induction heating cooker described in Patent Document 1 includes a scorching detection unit that stops cooking when the temperature at the bottom of the pan rises to a predetermined value or more during cooking. Therefore, it is possible to prevent the liquid from running out during cooking and cooking from scorching the pan. In addition, the induction heating cooker described in Patent Document 2 determines whether the cooked product has burned into the cooking container based on the temperature gradient of the temperature of the cooking container.
特開平１０－１４９８７５号公報。Japanese Patent Laid-Open No. 10-149875. 特開２００７－１１５５１５号公報。Japanese Patent Laid-Open No. 2007-115515. 特開２００１－３５７９６８号公報。JP 2001-357968 A. 国際公開第２００７／０８８９３１号パンフレット。International Publication No. 2007/088931 Pamphlet.
　しかしながら、特許文献１記載の誘導加熱調理器によれば、焦げ付き検知部は煮込み調理中の焦げ付きを検知するために設けられているので、利用者は、焦げ付き検知機能を使用するとき、煮込み調理に対応する特定の調理モード（例えば、煮込みモードである。）を選択するなどの、焦げ付き検知部を動作させるための所定の操作を行う必要があった。また、調理内容が炒め物である場合は一般に調理人が鍋の近くにいるので、自動的に焦げ付きを検知する必要がない。しかしながら、特許文献２の誘導加熱調理器は調理内容によらずに焦げ付き検知を行うので、焦げ付きを検知する必要がないときに焦げ付きが誤検知されて加熱出力を低下させてしまうことがあった。 However, according to the induction heating cooker described in Patent Document 1, the burn-in detection unit is provided for detecting burn-in during stew cooking, so that when the user uses the burn-in detection function, the user can use it for stew cooking. It has been necessary to perform a predetermined operation for operating the burnt detection unit, such as selecting a corresponding specific cooking mode (for example, a stew mode). In addition, when the cooking content is fried food, since the cook is generally near the pan, there is no need to automatically detect scorching. However, since the induction heating cooker of Patent Document 2 performs scoring detection regardless of cooking contents, scoring may be erroneously detected and the heating output may be reduced when it is not necessary to detect scoring.
　本発明の目的は以上の問題点を解決し、調理モードの選択などの焦げ付きを検知するための所定の操作を使用者に課すことなく、焦げ付き検知機能を動作させ又は停止できる誘導加熱調理器を提供することにある。 An object of the present invention is to solve the above-mentioned problems and to provide an induction heating cooker capable of operating or stopping a burn detection function without imposing a predetermined operation for detecting burn on, such as selection of a cooking mode. It is to provide.
　本発明に係る誘導加熱調理器は、鍋を載置するトッププレートと、前記トッププレートの下に設けられかつ前記鍋を誘導加熱する誘導加熱コイルと、前記誘導加熱コイルに高周波電流を供給するインバータ回路と、前記鍋の底から放射され前記トッププレートを透過する赤外線を検知して前記鍋の底面温度に対応する出力電圧を出力する赤外線センサと、複数の加熱出力設定値の中から１つの加熱出力設定値を選択するための出力設定部と、前記誘導加熱コイルに高周波電流を供給しかつ加熱出力が前記選択された加熱出力設定値に対応する加熱出力となるように前記インバータ回路の動作を制御する制御部と、前記赤外線センサの出力電圧が所定の第１出力電圧以上であるとき、前記鍋の底に調理物が焦げ付いたことを示す焦げ付き情報信号を発生して前記制御部に出力する焦げ付き検知部と、前記インバータ回路に入力される電力の積算電力を測定する積算電力測定部とを備え、前記制御部は、動作を開始するように前記インバータ回路を制御したとき前記積算電力の測定を開始するように前記積算電力測定部を制御し、前記積算電力測定部によって測定された積算電力が所定のしきい値積算電力に到達したとき、前記出力電圧が前記第１出力電圧より低い所定の第２出力電圧未満であるときは、前記焦げ付き情報信号に応答して加熱動作を停止し又は加熱出力を低下させるように前記インバータ回路を制御する一方、前記出力電圧が前記第２出力電圧以上であるときは、前記焦げ付き情報信号に応答して前記インバータ回路を制御することを禁止することを特徴とする。 An induction heating cooker according to the present invention includes a top plate on which a pan is placed, an induction heating coil that is provided below the top plate and induction-heats the pan, and an inverter that supplies a high-frequency current to the induction heating coil A circuit, an infrared sensor for detecting infrared radiation radiated from the bottom of the pan and passing through the top plate and outputting an output voltage corresponding to the bottom temperature of the pan, and heating from one of a plurality of heating output set values An output setting unit for selecting an output set value; and an operation of the inverter circuit so as to supply a high frequency current to the induction heating coil and the heating output becomes a heating output corresponding to the selected heating output set value. When the output voltage of the control unit to be controlled and the infrared sensor is equal to or higher than a predetermined first output voltage, burn information indicating that the cooked food has burned to the bottom of the pan A burn-out detection unit that generates a signal and outputs it to the control unit, and an integrated power measurement unit that measures an integrated power of the power input to the inverter circuit, and the control unit starts the operation so as to start the operation When the inverter circuit is controlled, the integrated power measuring unit is controlled to start measuring the integrated power, and when the integrated power measured by the integrated power measuring unit reaches a predetermined threshold integrated power, When the output voltage is less than a predetermined second output voltage lower than the first output voltage, the inverter circuit is controlled to stop the heating operation or reduce the heating output in response to the burned information signal. When the output voltage is equal to or higher than the second output voltage, it is prohibited to control the inverter circuit in response to the burn information signal.
　これによって、特定の調理モードの選択又は焦げ付き防止のための所定の機能の選択などの所定の操作を使用者に課すことなく、加熱出力設定値を変更可能な通常の加熱モードで調理を行っても焦げ付き検知機能（焦げ付き情報信号に応答してインバータ回路を制御する機能である。）が利用可能である。また、調理中に加熱出力設定値が変更されても、例えば調理内容が炒め物であるときに調理内容が煮物であると誤って判別して焦げ付き検知機能が不必要な場面で焦げ付き検知機能が働くことがない。また、調理内容が煮物であるときに調理内容が炒め物であると誤って判別して、焦げ付き検知機能が必要なときに焦げ付き検知が働かないということがなく、焦げ付き検知機能を利用することが出来る。 Thus, cooking is performed in a normal heating mode in which the heating output set value can be changed without imposing a predetermined operation such as selection of a specific cooking mode or selection of a predetermined function for preventing burning. Also, a burn detection function (a function for controlling an inverter circuit in response to a burn information signal) can be used. In addition, even if the heating output set value is changed during cooking, for example, when the cooking content is fried food, the cooking content is mistakenly determined to be boiled food, and the scorching detection function is not necessary in the scene where the scoring detection function is unnecessary. I don't work. Also, when the cooking content is boiled food, it is mistakenly determined that the cooking content is fried food, and there is no case that the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
　本発明に係る誘導加熱調理器によれば、特定の調理モードの選択又は焦げ付き防止のための所定の機能の選択などの所定の操作を使用者に課すことなく、焦げ付き検知機能を動作させ又は停止でき、かつ、調理中に焦げ付きを誤って検知しない。 According to the induction heating cooker according to the present invention, the burn-in detection function is operated or stopped without imposing a predetermined operation on the user such as selection of a specific cooking mode or selection of a predetermined function for preventing burn-in. It is possible and does not detect scoring accidentally during cooking.
本発明の第１の実施形態に係る誘導加熱調理器の斜視図である。It is a perspective view of the induction heating cooking appliance which concerns on the 1st Embodiment of this invention. 図１の誘導加熱部３の構成を示すブロック図である。It is a block diagram which shows the structure of the induction heating part 3 of FIG. 図２の整流平滑回路９３及びインバータ回路８の構成を示す回路図である。FIG. 3 is a circuit diagram showing configurations of a rectifying / smoothing circuit 93 and an inverter circuit 8 in FIG. 2. 図２の制御部９によって実行される加熱処理を示すフローチャートである。It is a flowchart which shows the heating process performed by the control part 9 of FIG. 図２の焦げ付き検知部１３によって実行される焦げ付き検知処理を示すフローチャートである。It is a flowchart which shows the burning detection process performed by the burning detection part 13 of FIG. （ａ）は加熱開始からの経過時間と図２の赤外線センサ１１からの出力電圧ＶＴとの関係を示すグラフであり、（ｂ）は加熱開始からの経過時間と積算電力Ｐとの関係を示すグラフである。(A) is a graph showing the relationship between the elapsed time from the start of heating and the output voltage VT from the infrared sensor 11 in FIG. 2, and (b) shows the relationship between the elapsed time from the start of heating and the integrated power P. It is a graph. 本発明の第２の実施形態に係る加熱処理を示すフローチャートである。It is a flowchart which shows the heat processing which concerns on the 2nd Embodiment of this invention. 図７のステップＳ３０における調理内容判断処理を示すフローチャートである。It is a flowchart which shows the cooking content determination process in step S30 of FIG. （ａ）は図７の加熱処理が実行されたときの加熱開始からの経過時間と加熱出力設定値ＷＨの関係の一例を示すグラフであり、（ｂ）は図７の加熱処理が実行されたときの加熱開始からの経過時間としきい値積算電力ＰＴとの関係の一例を示すグラフと、経過時間と積算電力Ｐとの関係の一例を示すグラフである。(A) is a graph which shows an example of the relationship between the elapsed time from the heating start when the heat processing of FIG. 7 was performed, and the heating output setting value WH, (b) was the heat processing of FIG. It is a graph which shows an example of the relationship between the elapsed time from the start of heating, and the threshold integrated power PT, and an example of the relationship between the elapsed time and the integrated power P. 本発明の第３の実施形態に係る誘導加熱部３Ａの構成を示すブロック図である。It is a block diagram which shows the structure of 3 A of induction heating parts which concern on the 3rd Embodiment of this invention. 図１０の制御部９Ａによって実行される加熱処理を示すフローチャートである。It is a flowchart which shows the heating process performed by 9 A of control parts of FIG. 本発明の第４の実施形態に係る誘導加熱部３Ｂの構成の構成を示すグラフである。It is a graph which shows the structure of the structure of the induction heating part 3B which concerns on the 4th Embodiment of this invention.
　第１の発明は、鍋を載置するトッププレートと、前記トッププレートの下に設けられかつ前記鍋を誘導加熱する誘導加熱コイルと、前記誘導加熱コイルに高周波電流を供給するインバータ回路と、前記鍋の底から放射され前記トッププレートを透過する赤外線を検知して前記鍋の底面温度に対応する出力電圧を出力する赤外線センサと、複数の加熱出力設定値の中から１つの加熱出力設定値を選択するための出力設定部と、前記誘導加熱コイルに高周波電流を供給しかつ加熱出力が前記選択された加熱出力設定値に対応する加熱出力となるように前記インバータ回路の動作を制御する制御部と、前記赤外線センサの出力電圧が所定の第１出力電圧以上であるとき、前記鍋の底に調理物が焦げ付いたことを示す焦げ付き情報信号を発生して前記制御部に出力する焦げ付き検知部と、前記インバータ回路に入力される電力の積算電力を測定する積算電力測定部とを備え、前記制御部は、動作を開始するように前記インバータ回路を制御したとき前記積算電力の測定を開始するように前記積算電力測定部を制御し、前記積算電力測定部によって測定された積算電力が所定のしきい値積算電力に到達したとき、前記出力電圧が前記第１出力電圧より低い所定の第２出力電圧未満であるときは、前記焦げ付き情報信号に応答して加熱動作を停止し又は加熱出力を低下させるように前記インバータ回路を制御する一方、前記出力電圧が前記第２出力電圧以上であるときは、前記焦げ付き情報信号に応答して前記インバータ回路を制御することを禁止することを特徴とする。 The first invention includes a top plate for placing a pan, an induction heating coil provided under the top plate and for induction heating the pan, an inverter circuit for supplying a high frequency current to the induction heating coil, An infrared sensor that detects infrared rays radiated from the bottom of the pan and passes through the top plate and outputs an output voltage corresponding to the bottom temperature of the pan, and one heating output setting value from a plurality of heating output setting values An output setting unit for selecting, and a control unit for supplying a high-frequency current to the induction heating coil and controlling the operation of the inverter circuit so that the heating output becomes a heating output corresponding to the selected heating output setting value And when the output voltage of the infrared sensor is equal to or higher than a predetermined first output voltage, a burned information signal is generated to indicate that the cooked food has burned to the bottom of the pan. A burn-out detection unit that outputs to the control unit, and an integrated power measurement unit that measures the integrated power of the power input to the inverter circuit, and the control unit controls the inverter circuit to start operation The integrated power measuring unit is controlled to start measuring the integrated power, and when the integrated power measured by the integrated power measuring unit reaches a predetermined threshold integrated power, the output voltage is When the output voltage is less than a predetermined second output voltage lower than the output voltage, the inverter circuit is controlled to stop the heating operation or reduce the heating output in response to the burned information signal, while the output voltage is When the voltage is equal to or higher than the second output voltage, it is prohibited to control the inverter circuit in response to the burned information signal.
　これによって、特定の調理モードの選択又は焦げ付き防止のための所定の機能の選択などの所定の操作を使用者に課すことなく、加熱出力設定値を変更可能な通常の加熱モードで調理を行っても焦げ付き検知機能（焦げ付き情報信号に応答してインバータ回路を制御する機能である。）が利用可能である。また、選択された加熱出力設定値の大小に関わらず、従来技術に比較して高精度に、焦げ付き検知機能が不要な調理内容（例えば、炒め物である。）と焦げ付き検知機能が必要な調理内容（例えば、煮物である。）とを判別できるので、調理中に加熱出力設定値が変更されても、例えば調理内容が炒め物であるときに調理内容が煮物であると誤って判別して焦げ付き検知機能が不必要な場面で焦げ付き検知機能が働いて調理に支障をきたすことがない。また、調理内容が煮物であるときに調理内容が炒め物であると誤って判別して、焦げ付き検知機能が必要なときに焦げ付き検知が働かないということがなく、焦げ付き検知機能を利用することが出来る。 Thus, cooking is performed in a normal heating mode in which the heating output set value can be changed without imposing a predetermined operation such as selection of a specific cooking mode or selection of a predetermined function for preventing burning. Also, a burn detection function (a function for controlling an inverter circuit in response to a burn information signal) can be used. Regardless of the selected heating output set value, cooking contents that do not require a burn-in detection function (for example, fried food) and cooking that requires a burn-in detection function are more accurate than conventional techniques. Since the contents (for example, boiled food) can be discriminated, even if the heating output set value is changed during cooking, for example, when the cooking contents are fried food, the cooking contents are mistakenly determined to be boiled food. The scoring detection function works in situations where the scoring detection function is unnecessary, and does not hinder cooking. Also, when the cooking content is boiled food, it is mistakenly determined that the cooking content is fried food, and there is no case that the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
　第２の発明は、特に、第１の発明において、前記制御部は、前記選択された加熱出力設定値が大きいほど前記しきい値積算電力が小さくなるように、前記しきい値積算電力を設定することを特徴とする。 In a second aspect of the invention, in particular, in the first aspect of the invention, the control unit sets the threshold integrated power so that the threshold integrated power decreases as the selected heating output set value increases. It is characterized by doing.
　従って、調理中に加熱出力設定値が変更された場合にも高精度に、例えば炒め物と煮物の判別を行うことができ、例えば調理内容が炒め物であるときに調理内容が煮物であると誤って判別して焦げ付き検知機能が不必要な場面で焦げ付き検知機能が働いて調理に支障をきたすことがない。また、調理内容が煮物であるときに調理内容が炒め物であると誤って判別して、焦げ付き検知機能が必要なときに焦げ付き検知が働かないということがなく、焦げ付き検知機能を利用することが出来る。 Therefore, even when the heating output set value is changed during cooking, for example, it is possible to distinguish between fried food and boiled food. For example, when the cooking content is fried food, the cooking content is boiled food. The scoring detection function works in situations where the scoring detection function is unnecessary and the scoring detection function is unnecessary, so that cooking is not hindered. Also, when the cooking content is boiled food, it is mistakenly determined that the cooking content is fried food, and there is no case that the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
　第３の発明は、特に、第１又は第２の発明において、前記インバータ回路に入力される入力電流及び前記インバータ回路の共振電圧を測定する計測部と、前記測定された入力電流及び共振電圧に基づいて、前記鍋の材質を判別する鍋種判別部とをさらに備え、前記制御部は、前記鍋種判別部により判別された前記鍋の材質の熱伝導度が大きいほど、前記しきい値積算電力が大きくなるように、前記しきい値積算電力を設定することを特徴とする。 According to a third aspect of the invention, in particular, in the first or second aspect of the invention, a measurement unit that measures the input current input to the inverter circuit and the resonance voltage of the inverter circuit, and the measured input current and resonance voltage A pan type discriminating unit for discriminating the material of the pan, and the control unit increases the threshold value as the thermal conductivity of the material of the pan discriminated by the pan type discriminating unit increases. The threshold integrated power is set so as to increase the power.
　従って、鍋の特性に応じて積算電力しきい値を切り替えることにより、鍋の材質に関係なく高精度に例えば炒め物と煮物の判別を行うことができ、例えば調理内容が炒め物であるときに調理内容が煮物であると誤って判別して焦げ付き検知機能が不必要な場面で焦げ付き検知機能が働いて調理に支障をきたすことがない。また、調理内容が煮物であるときに調理内容が炒め物であると誤って判別して、焦げ付き検知機能が必要なときに焦げ付き検知が働かないということがなく、焦げ付き検知機能を利用することが出来る。 Therefore, by switching the integrated power threshold according to the characteristics of the pan, it is possible to distinguish, for example, fried food and boiled food with high accuracy regardless of the material of the pot. For example, when the cooking content is fried food The cooking content is mistakenly determined to be boiled food, and the burning detection function works in situations where the burning detection function is unnecessary, so that cooking is not hindered. Also, when the cooking content is boiled food, it is mistakenly determined that the cooking content is fried food, and there is no case that the burning detection function does not work when the burning detection function is necessary, and the burning detection function can be used. I can do it.
　第４の発明は、特に、第３の発明において、前記鍋種判別部は、前記測定された入力電流とあらかじめ設定された第１の電流値との差、及び前記測定された共振電圧とあらかじめ設定された第１の電圧値との差に基づいて、前記鍋の材質を判別することを特徴とする。本発明は、第３の発明と同様の効果を奏する。 In a fourth aspect of the invention, in particular, in the third aspect of the invention, the pan type discriminating unit is configured so that the difference between the measured input current and a preset first current value, and the measured resonance voltage The material of the pan is determined based on the difference from the set first voltage value. The present invention has the same effects as the third invention.
　第５の発明は、特に、第１から第４のうちのいずれか１つの発明において、前記制御部は、前記選択された加熱出力設定値が所定の加熱出力設定値より高いとき、前記焦げ付き情報信号に応答して前記インバータ回路を制御することを禁止し、前記積算電力の測定を継続するように前記積算電力測定部を制御することを特徴とする。 In a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, when the selected heating output set value is higher than a predetermined heating output set value, the control unit is configured to provide the burned information. Controlling the inverter circuit in response to a signal is prohibited, and the integrated power measuring unit is controlled to continue the measurement of the integrated power.
　これにより、特に、炒め物調理時によく用いられる比較的高い加熱出力設定値においては焦げ付き検知情報信号に応答してインバータ回路の制御を行うことを禁止できる。また、煮物調理において、始めに比較的高い加熱出力設定値で加熱した後に、低い加熱出力設定値に変更した場合に、焦げ付き検知情報信号に応答して加熱動作を停止し又は加熱出力を低下させるようにインバータ回路を制御できる。 This makes it possible to prohibit the control of the inverter circuit in response to the burn-in detection information signal, particularly at a relatively high heating output setting value often used when fried foods are cooked. In addition, in boiled food cooking, when heating is initially set to a relatively high heating output set value and then changed to a low heating output set value, the heating operation is stopped or the heating output is reduced in response to the burn detection information signal. Thus, the inverter circuit can be controlled.
　第６の発明は、特に、第１から第５のうちのいずれか１つの発明において、前記インバータ回路に入力される入力電流及び前記インバータ回路の共振電圧を測定する計測部と、前記測定された入力電流及び共振電圧に基づいて、前記トッププレート上に前記鍋があるか否かを判別する鍋無し検知部とをさらに備え、前記制御部は、前記鍋無し検知部により、前記トッププレート上に前記鍋が無いと判別された場合、前記積算電力測定部を、前記積算電力を初期化するように制御することを特徴とする。 In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, the measurement unit that measures the input current input to the inverter circuit and the resonance voltage of the inverter circuit, and the measurement A panless detector that determines whether or not the pan is on the top plate based on an input current and a resonance voltage, and the control unit is placed on the top plate by the panless detector. When it is determined that there is no pan, the integrated power measuring unit is controlled to initialize the integrated power.
　これにより、特に、使用者が、調理を終了した後に、誘導加熱調理器の電源の入り切りを行わずに鍋を取り替えて次の調理を行う場合にも、焦げ付き検知機能を正確に利用することができる。 Thereby, in particular, when the user finishes cooking and replaces the pot without turning on and off the power of the induction heating cooker and performs the next cooking, the burn detection function can be used accurately. it can.
　第７の発明は、特に、第６の発明において、前記鍋無し検知部は、前記測定された入力電流とあらかじめ設定された第２の電流値との差、及び前記測定された共振電圧とあらかじめ設定された第２の電圧値との差に基づいて、前記トッププレート上に前記鍋があるか否かを判別することを特徴とする。本発明は、第６の発明と同様の効果を奏する。 In a seventh aspect of the invention, in particular, in the sixth aspect of the invention, the no-pan detector detects the difference between the measured input current and a preset second current value, and the measured resonance voltage in advance. Based on a difference from the set second voltage value, it is determined whether or not the pan is on the top plate. The present invention has the same effects as the sixth invention.
　第８の発明は、特に、第１から第５のうちのいずれか１つの発明において、前記しきい値積算電力は、前記誘導加熱調理器による調理内容が炒め物であるときに前記鍋の底に調理物が焦げ付く前の所定の積算電力に設定され、前記第２出力電圧は、前記調理内容が煮物である場合に、前記積算電力が前記しきい値積算電力になったときの前記出力電圧より高く、かつ、前記調理内容が炒め物である場合に、前記積算電力が前記しきい値積算電力になったときの前記出力電圧より低い出力電圧に設定されたことを特徴とする。 In an eighth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, the threshold integrated power is obtained when the cooking content of the induction heating cooker is fried food. When the cooked food is cooked, the second output voltage is the output voltage when the accumulated power becomes the threshold integrated power when the cooking content is boiled food. When the cooking content is fried, the output power is set to an output voltage lower than the output voltage when the integrated power reaches the threshold integrated power.
　これにより、調理内容が炒め物であるか又は煮物であるかを判別できる。 This makes it possible to determine whether the cooking content is fried or boiled.
　以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。また、同様の構成要素については同一の符号を付している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, the same code | symbol is attached | subjected about the same component.
（第１の実施形態）
　図１は、本発明の第１の実施形態に係る誘導加熱調理器の構成を示す斜視図である。図１において、外郭ケース１の上部にガラスなどの電気絶縁物からなり赤外線を透過するトッププレート２が設けられている。トッププレート２には、誘導加熱により調理容器である鍋１２を誘導加熱する誘導加熱部３と、輻射熱により非金属性の鍋などを加熱するラジェントヒータ部４とが設けられる。また、外郭ケース１の側面に、魚等を焼くグリル５、及び各熱源の操作及び各熱源の状態の表示のための操作表示部６が設けられている。 (First embodiment)
FIG. 1 is a perspective view showing the configuration of the induction heating cooker according to the first embodiment of the present invention. In FIG. 1, a top plate 2 made of an electrical insulator such as glass and transmitting infrared rays is provided on an upper portion of an outer case 1. The top plate 2 is provided with an induction heating unit 3 that induction-heats the pan 12 that is a cooking container by induction heating, and a radial heater unit 4 that heats a nonmetallic pan or the like by radiant heat. Further, a grill 5 for grilling fish and the like, and an operation display unit 6 for operating each heat source and displaying the state of each heat source are provided on the side surface of the outer case 1.
　詳細後述するように、本実施形態に係る誘導加熱調理器は、
（ａ）鍋１２を載置するトッププレート２と、
（ｂ）トッププレート２の下に設けられかつ鍋１２を誘導加熱する加熱コイル７と、
（ｃ）加熱コイル７に高周波電流を供給するインバータ回路８と、
（ｄ）鍋１２の底から放射されトッププレート２を透過する赤外線を検知して鍋１２の底面温度に対応する出力電圧ＶＴを出力する赤外線センサ１１と、
（ｅ）複数の加熱出力設定値の中から１つの加熱出力設定値ＷＨを選択するための出力設定部１０と、
（ｆ）加熱コイル７に高周波電流を供給しかつ加熱出力が選択された加熱出力設定値ＷＨに対応する加熱出力となるようにインバータ回路８の動作を制御する制御部９と、
（ｇ）赤外線センサ１１の出力電圧ＶＴが所定の出力電圧Ｖ１以上であるとき、鍋１２の底に調理物１４が焦げ付いたことを示す焦げ付き情報信号ＳＢを発生して制御部９に出力する焦げ付き検知部１３と、
　インバータ回路８に入力される電力の積算電力Ｐを測定する積算電力測定部１５とを備えて構成される。 As will be described in detail later, the induction heating cooker according to the present embodiment is
(A) the top plate 2 on which the pan 12 is placed;
(B) a heating coil 7 provided under the top plate 2 and for induction heating the pan 12;
(C) an inverter circuit 8 for supplying a high-frequency current to the heating coil 7;
(D) an infrared sensor 11 that detects infrared rays radiated from the bottom of the pan 12 and transmits the top plate 2 and outputs an output voltage VT corresponding to the bottom temperature of the pan 12;
(E) an output setting unit 10 for selecting one heating output setting value WH from a plurality of heating output setting values;
(F) a control unit 9 that supplies a high-frequency current to the heating coil 7 and controls the operation of the inverter circuit 8 so that the heating output becomes a heating output corresponding to the selected heating output set value WH;
(G) When the output voltage VT of the infrared sensor 11 is equal to or higher than the predetermined output voltage V1, the burned information signal SB indicating that the food 14 has burned on the bottom of the pan 12 is generated and output to the control unit 9 A detector 13;
And an integrated power measuring unit 15 that measures the integrated power P of the power input to the inverter circuit 8.
　ここで、制御部９は、動作を開始するようにインバータ回路８を制御したとき積算電力Ｐの測定を開始するように積算電力測定部１５を制御し、積算電力測定部１５によって測定された積算電力Ｐが所定のしきい値積算電力ＰＴに到達したとき、出力電圧ＶＴが出力電圧Ｖ１より低い所定の出力電圧Ｖ２未満であるときは、焦げ付き情報信号ＳＢに応答して加熱動作を停止し又は加熱出力を低下させるようにインバータ回路８を制御する一方、出力電圧ＶＴが出力電圧以上Ｖ２以上であるときは、焦げ付き情報信号ＳＢに応答してインバータ回路８を制御することを禁止することを特徴としている。 Here, the control unit 9 controls the integrated power measuring unit 15 so as to start measuring the integrated power P when the inverter circuit 8 is controlled so as to start the operation, and the integrated power measured by the integrated power measuring unit 15 is controlled. When the power P reaches the predetermined threshold integrated power PT, if the output voltage VT is less than the predetermined output voltage V2 lower than the output voltage V1, the heating operation is stopped in response to the burned information signal SB or The inverter circuit 8 is controlled so as to reduce the heating output. On the other hand, when the output voltage VT is equal to or higher than the output voltage and V2 or higher, it is prohibited to control the inverter circuit 8 in response to the burned information signal SB. It is said.
　図２は、図１の誘導加熱部３の構成を示すブロック図である。図２において、誘導加熱部３は、トッププレート２の下方に設けられた誘導加熱コイル７（以下、加熱コイル７という。）と、赤外線センサ１１と、インバータ回路８と、商用交流電源９１と、整流平滑回路９３と、入力電流検出回路９２と、積算電力測定部１５と、焦げ付き検知部１３と、制御部９とを備えて構成される。また、操作表示部６は、加熱開始スイッチ６ｓと、出力設定部１０とを備えて構成される。 FIG. 2 is a block diagram showing a configuration of the induction heating unit 3 of FIG. In FIG. 2, the induction heating unit 3 includes an induction heating coil 7 (hereinafter referred to as a heating coil 7) provided below the top plate 2, an infrared sensor 11, an inverter circuit 8, a commercial AC power supply 91, A rectifying / smoothing circuit 93, an input current detection circuit 92, an integrated power measurement unit 15, a scoring detection unit 13, and a control unit 9 are configured. The operation display unit 6 includes a heating start switch 6 s and an output setting unit 10.
　図２において、加熱開始スイッチ６ｓは、使用者が誘導加熱部３に対して加熱開始を指示するために設けられ、使用者によって操作されると加熱開始を示す信号を制御部に出力する。また、出力設定部１０は、使用者が誘導加熱コイル７の加熱出力設定値を複数の加熱出力設定値の中から選択するために設けられ、使用者によって選択された加熱出力設定値ＷＨを制御部９に出力する。 In FIG. 2, the heating start switch 6s is provided for the user to instruct the induction heating unit 3 to start heating, and when operated by the user, outputs a signal indicating the start of heating to the control unit. The output setting unit 10 is provided for the user to select the heating output setting value of the induction heating coil 7 from a plurality of heating output setting values, and controls the heating output setting value WH selected by the user. To the unit 9.
　また、図２において、赤外線センサ１１は、ＩｎＧａＡｓピンフォトダイオードなどからなり、トッププレート２の下部の加熱コイル７近傍に設けられる。赤外線センサ１１は、調理容器である鍋１２の底から放射されトッププレート２を透過する赤外線の赤外線量を検知し、検出された赤外線量に基づいて鍋１２の底面温度に対応する出力電圧ＶＴを発生して制御部９及び焦げ付き検知部１３に出力する。 In FIG. 2, the infrared sensor 11 is made of an InGaAs pin photodiode or the like, and is provided in the vicinity of the heating coil 7 below the top plate 2. The infrared sensor 11 detects the amount of infrared rays that are radiated from the bottom of the pan 12 that is a cooking vessel and passes through the top plate 2, and outputs the output voltage VT corresponding to the bottom temperature of the pan 12 based on the detected amount of infrared rays. Generated and output to the control unit 9 and the burning detection unit 13.
　さらに、図２において、焦げ付き検知部１３は、赤外線センサ１１からの出力電圧ＶＴに基づいて、図５の焦げ付き検知処理を実行する。図５は、図２の焦げ付き検知部１３によって実行される焦げ付き検知処理を示すフローチャートである。 Further, in FIG. 2, the burn detection unit 13 performs the burn detection process of FIG. 5 based on the output voltage VT from the infrared sensor 11. FIG. 5 is a flowchart showing the burn detection process executed by the burn detection unit 13 of FIG.
　図５のステップＳ６０において、焦げ付き検知部１３は、出力電圧ＶＴが所定の出力電圧Ｖ１以上であるか否かを判断し、ＹＥＳのときはステップＳ６１に進む一方、ＮＯのときはステップＳ６０の処理を繰り返して実行する。そして、ステップＳ６１において、焦げ付き検知部１３は、鍋１２が焦げ付いたことを示す焦げ付き情報信号ＳＢを制御部９に出力し、焦げ付き検知処理を終了する。ここで、出力電圧Ｖ１は、カレーなどの比較的高い粘性を有する調理物１４を煮込んでいるときに（すなわち、調理内容が煮物であるときに）、調理物１４が鍋１２に焦げ付く温度に対応する出力電圧ＶＴに設定される。 In step S60 of FIG. 5, the burn detection unit 13 determines whether or not the output voltage VT is equal to or higher than a predetermined output voltage V1, and proceeds to step S61 if YES, while processing in step S60 if NO. Execute repeatedly. In step S61, the burn detection unit 13 outputs a burn information signal SB indicating that the pan 12 has burned to the control unit 9 and ends the burn detection process. Here, the output voltage V1 corresponds to the temperature at which the cooked product 14 burns into the pan 12 when the cooked product 14 having a relatively high viscosity such as curry is boiled (that is, when the cooking content is cooked). Output voltage VT to be set.
　図３は、図２の整流平滑回路９３及びインバータ回路８の構成を示す回路図である。図３において、整流平滑回路９３は、ダイオードブリッジ回路を含みかつ商用交流電源９１からの交流電圧を全波整流して直流電圧に変換する全波整流器９４と、全波整流器９４の第１の出力端子に接続された一端を有するチョークコイル９５と、全波整流器９４の第２の出力端子に接続された一端とチョークコイル９５の他端に接続された他端とを有する平滑コンデンサ９６とを備えて構成される。ここで、チョークコイル９５と平滑コンデンサ９６とはローパスフィルタを構成する。また、インバータ回路８は、チョークコイル９５及び平滑コンデンサ９６の各他端に接続された一端を有する共振コンデンサ８１と、平滑コンデンサ９６の他端と共振コンデンサ８１の他端との間に接続されたスイッチング素子８３と、スイッチング素子８３に逆並列に接続されたダイオード８２とを備えて構成される。ここで、加熱コイル７は共振コンデンサ８１に並列に接続される。また、商用交流電源９１と全波整流器９４との間に、商用交流電源９１から整流平滑回路９３への入力電流を検出して検出した入力電流を含む信号を積算電力検出部１５に出力する入力電流検出回路９２が設けられる。入力電流検出回路９２は、例えば変流器（ＣＴ（Current Transformer））である。図３において、スイッチング素子８３は制御部９によってオンオフ制御され、これにより加熱コイル７に高周波電流が流れる。そして、加熱コイル７に高周波磁界が発生し、これに伴って鍋１２に渦電流が発生し、鍋１２が誘導加熱される。 FIG. 3 is a circuit diagram showing the configuration of the rectifying / smoothing circuit 93 and the inverter circuit 8 of FIG. In FIG. 3, a rectifying / smoothing circuit 93 includes a diode bridge circuit and full-wave rectifies an AC voltage from a commercial AC power supply 91 to convert it into a DC voltage, and a first output of the full-wave rectifier 94. A choke coil 95 having one end connected to the terminal, and a smoothing capacitor 96 having one end connected to the second output terminal of the full-wave rectifier 94 and the other end connected to the other end of the choke coil 95. Configured. Here, the choke coil 95 and the smoothing capacitor 96 constitute a low-pass filter. The inverter circuit 8 is connected between a resonance capacitor 81 having one end connected to each other end of the choke coil 95 and the smoothing capacitor 96, and between the other end of the smoothing capacitor 96 and the other end of the resonance capacitor 81. The switching element 83 includes a switching element 83 and a diode 82 connected in antiparallel to the switching element 83. Here, the heating coil 7 is connected to the resonance capacitor 81 in parallel. Further, an input for detecting an input current from the commercial AC power supply 91 to the rectifying / smoothing circuit 93 between the commercial AC power supply 91 and the full-wave rectifier 94 and outputting a signal including the detected input current to the integrated power detection unit 15. A current detection circuit 92 is provided. The input current detection circuit 92 is, for example, a current transformer (CT (Current Transformer)). In FIG. 3, the switching element 83 is on / off controlled by the control unit 9, whereby a high frequency current flows through the heating coil 7. And a high frequency magnetic field generate | occur | produces in the heating coil 7, and an eddy current generate | occur | produces in the pan 12 in connection with this, and the pan 12 is induction-heated.
　また、図２において、積算電力測定部１５は、入力電流検出回路９２によって検出された入力電流を積算することにより、インバータ回路８に入力される積算電力Ｐを測定し、測定された積算電力Ｐを制御部９に出力する。なお、積算電力測定部１５は、制御部９からの制御に基づいて積算電力Ｐをゼロに初期化して測定を開始する。 In FIG. 2, the integrated power measurement unit 15 measures the integrated power P input to the inverter circuit 8 by integrating the input current detected by the input current detection circuit 92, and the measured integrated power P Is output to the control unit 9. The integrated power measuring unit 15 initializes the integrated power P to zero based on the control from the control unit 9 and starts measurement.
　さらに、図２において、制御部９は、使用者が加熱出力設定値ＷＨを変更可能でありかつ加熱出力が出力設定部１０により選択された加熱出力設定値ＷＨに対応する加熱出力となるようにスイッチング素子８３をオンオフ制御する加熱モードを有する。また、制御部９は、焦げ付き検知部１３からの焦げ付き情報信号ＳＢと、赤外線センサ１１からの出力電圧ＶＴと、積算電力測定部１５からの積算電力Ｐとを用いて図４の加熱処理を実行する。 Further, in FIG. 2, the control unit 9 allows the user to change the heating output set value WH so that the heating output becomes a heating output corresponding to the heating output set value WH selected by the output setting unit 10. It has a heating mode in which the switching element 83 is on / off controlled. Further, the control unit 9 performs the heating process of FIG. 4 using the burnt information signal SB from the burnt detection unit 13, the output voltage VT from the infrared sensor 11, and the accumulated power P from the accumulated power measuring unit 15. To do.
　図４は、図２の制御部９によって実行される加熱処理を示すフローチャートである。図４のステップＳ１０において、誘導加熱調理器の電源がオンされると、制御部９は動作モードを待機モードに設定する。制御部９は、待機モードにおいて加熱動作を停止しており、使用者は加熱開始スイッチ６ｓの操作及び出力設定部１０による加熱出力設定値ＷＨの設定をできる。次に、ステップＳ１１において、制御部９は加熱開始スイッチ６ｓが操作されたか否かを判断し、ＹＥＳのときはステップＳ１２に進む一方、ＮＯのときはステップＳ１１の処理を繰り返して実行する。そして、ステップＳ１２において、制御部９は加熱モードでの加熱動作を開始し、インバータ回路８への積算電力Ｐの測定を開始するように、積算電力測定部１５を制御する。これに応答して、積算電力測定部１５は、積算電力Ｐをゼロに初期化した後に積算電力Ｐの積算を開始する。なお、積算電力測定部１５は、少なくとも加熱動作中は常に積算電力Ｐを測定して制御部９に出力している。次に、ステップＳ１３において、制御部９は、鍋１２の温度に対応する出力電圧ＶＴの出力を開始するように、赤外線センサ１１を制御する。これに応答して、赤外線センサ１１は鍋１２の温度に対応する出力電圧ＶＴの出力を開始する。なお、赤外線センサ１１は、少なくとも加熱動作中は常に出力電圧ＶＴを制御部９に出力している。 FIG. 4 is a flowchart showing the heating process executed by the control unit 9 of FIG. In step S10 of FIG. 4, when the power of the induction heating cooker is turned on, the control unit 9 sets the operation mode to the standby mode. The control unit 9 stops the heating operation in the standby mode, and the user can operate the heating start switch 6s and set the heating output set value WH by the output setting unit 10. Next, in step S11, the controller 9 determines whether or not the heating start switch 6s has been operated. If YES, the process proceeds to step S12. If NO, the process of step S11 is repeated. In step S <b> 12, the control unit 9 starts the heating operation in the heating mode, and controls the integrated power measuring unit 15 so as to start measuring the integrated power P to the inverter circuit 8. In response to this, the integrated power measurement unit 15 starts integrating the integrated power P after initializing the integrated power P to zero. The integrated power measurement unit 15 always measures the integrated power P and outputs it to the control unit 9 at least during the heating operation. Next, in step S <b> 13, the control unit 9 controls the infrared sensor 11 to start outputting the output voltage VT corresponding to the temperature of the pan 12. In response to this, the infrared sensor 11 starts outputting the output voltage VT corresponding to the temperature of the pan 12. The infrared sensor 11 always outputs the output voltage VT to the control unit 9 at least during the heating operation.
　次に、ステップＳ１４において、制御部９はしきい値積算電力ＰＴを所定の積算電力Ｐ１に設定する。そして、ステップＳ１５において、積算電力Ｐがしきい値積算電力ＰＴ以上であるか否かを判断し、ＹＥＳのときはステップＳ１６に進む一方、ＮＯのときはステップＳ１５の処理を繰り返して実行する。さらに、ステップＳ１６において、制御部９は、出力電圧ＶＴが所定の出力電圧Ｖ２以上であるか否かを判断し、ＹＥＳのときは調理内容は炒め物であると判断してステップＳ１９に進む一方、ＮＯのときは調理内容は煮物であると判断してステップＳ１７に進む。なお、ステップＳ１４～Ｓ１６の処理は、積算電力Ｐと出力電圧ＶＴとに基づいて調理内容が炒め物であるか又は煮物であるかを判断する調理内容判断処理である。 Next, in step S14, the control unit 9 sets the threshold integrated power PT to a predetermined integrated power P1. In step S15, it is determined whether or not the integrated power P is greater than or equal to the threshold integrated power PT. If YES, the process proceeds to step S16. If NO, the process of step S15 is repeated. Furthermore, in step S16, the control unit 9 determines whether or not the output voltage VT is equal to or higher than the predetermined output voltage V2, and if YES, the cooking content is determined to be a fried food and the process proceeds to step S19. If NO, the cooking content is determined to be boiled and the process proceeds to step S17. Note that the processing in steps S14 to S16 is cooking content determination processing for determining whether the cooking content is a fried food or a boiled food based on the integrated power P and the output voltage VT.
　また、ステップＳ１９において、制御部９は焦げ付き情報信号ＳＢに応答してインバータ回路８を制御することを禁止して（すなわち、ステップＳ１８の処理を実行することなく）、加熱動作を継続し加熱処理を終了する。一方、ステップＳ１７において、制御部９は、焦げ付き検知部１３から焦げ付き情報信号ＳＢを入力したか否かを判断し、ＹＥＳのときはステップＳ１８に進む一方、ＮＯのときはステップＳ１７の処理を繰り返して実行する。そして、ステップＳ１８において、制御部９は加熱動作を停止し又は加熱出力を低下させるようにインバータ回路８を制御し、加熱処理を終了する。なお、ステップＳ１８における処理の内容は、加熱出力設定値ＷＨに基づいて、焦げ付きによって鍋１２が受けるダメージの程度により決定される。 In step S19, the control unit 9 prohibits the control of the inverter circuit 8 in response to the burned information signal SB (that is, without executing the process of step S18), continues the heating operation, and performs the heating process. Exit. On the other hand, in step S17, the control unit 9 determines whether or not the burnt information signal SB is input from the burnt detection unit 13, and proceeds to step S18 if YES, and repeats the process of step S17 if NO. And execute. And in step S18, the control part 9 controls the inverter circuit 8 so that a heating operation may be stopped or a heating output may be reduced, and a heating process is complete | finished. In addition, the content of the process in step S18 is determined by the extent of the damage which the pan 12 receives by scoring based on the heating output setting value WH.
　図６において、（ａ）は加熱開始からの経過時間と図２の赤外線センサ１１からの出力電圧ＶＴとの関係を示すグラフであり、（ｂ）は加熱開始からの経過時間と積算電力Ｐとの関係を示すグラフである。図６（ａ）に示すように、調理内容が炒め物である場合の焦げ付きが発生したときの出力電圧曲線Ｃ１において、積算電力Ｐが積算電力Ｐ１になったタイミングＴ１における出力電圧ＶＴは出力電圧Ｖ４（Ｖ４＜Ｖ１）である。一方、調理内容が煮物である場合の焦げ付きが発生したときの出力電圧曲線Ｃ２において、タイミングＴ１における出力電圧ＶＴは出力電圧Ｖ３（Ｖ３＜Ｖ４）である。従って、図４のステップＳ１６において用いられる出力電圧Ｖ２を出力電圧Ｖ３とＶ４との間に値に設定することにより、調理内容が炒め物であるか又は煮物であるかを判断できる。なお、積算電力Ｐ１は、積算電力Ｐの測定開始から、ステップＳ１５における判断処理においてＹＥＳと判断されるまでの時間が例えば１００秒から２００秒までの時間になるように設定される。すなわち、積算電力Ｐ１は、誘導加熱調理器による調理内容が炒め物であるときに鍋１２の底に調理物１４が焦げ付く前の積算電力Ｐに設定され、出力電圧Ｖ２は、調理内容が煮物である場合に、積算電力Ｐが積算電力Ｐ１になったときの出力電圧Ｖ３より高く、かつ、調理内容が炒め物である場合に、積算電力Ｐが積算電力Ｐ１になったときの出力電圧Ｖ４より低い出力電圧ＶＴに設定される。 6, (a) is a graph showing the relationship between the elapsed time from the start of heating and the output voltage VT from the infrared sensor 11 in FIG. 2, and (b) is the elapsed time from the start of heating and the integrated power P. It is a graph which shows the relationship. As shown in FIG. 6 (a), the output voltage VT at the timing T1 at which the integrated power P becomes the integrated power P1 in the output voltage curve C1 when the cooking content is the fried food and the burn is generated is the output voltage VT. V4 (V4 <V1). On the other hand, in the output voltage curve C2 when charring occurs when the cooking content is boiled food, the output voltage VT at the timing T1 is the output voltage V3 (V3 <V4). Therefore, by setting the output voltage V2 used in step S16 of FIG. 4 to a value between the output voltages V3 and V4, it is possible to determine whether the cooking content is fried or boiled. The integrated power P1 is set so that the time from the start of measurement of the integrated power P until it is determined as YES in the determination process in step S15 is, for example, a time from 100 seconds to 200 seconds. That is, the integrated power P1 is set to the integrated power P before the food 14 is burnt on the bottom of the pan 12 when the cooking content by the induction heating cooker is fried, and the output voltage V2 is the cooking content. In some cases, when the accumulated power P is higher than the output voltage V3 when the accumulated power P becomes the accumulated power P1, and the cooking content is the stir-fry, the output voltage V4 when the accumulated power P becomes the accumulated power P1. A low output voltage VT is set.
　一般に、調理内容が炒め物であるときは調理人が鍋１２の近くにいるため、誘導加熱調理器による焦げ付きの検知を行う必要がない。本実施形態によれば、調理内容が炒め物であるか又は煮物であるかを判断し、調理内容が炒め物であるときは焦げ付き情報信号Ｓ１３に応答してインバータ回路８を制御することを禁止して加熱動作を継続する一方、調理内容が煮物であるときは焦げ付き情報信号Ｓ１３に基づいて加熱動作を停止し又は加熱出力を低下させる。従って、利用者が、調理モードの選択などの焦げ付きを自動的に検知するための所定の操作を使用者に課すことなく、調理内容（煮物又は炒め物）に応じて焦げ付き情報信号ＳＢに基づくインバータ回路８の制御（ステップＳ１８の処理である。）を実行し、又は禁止できる。このため、炒め物調理の際に不必要に加熱を停止したり、加熱出力を弱めたりすることがないので、従来技術に比較して使い勝手を向上することができる。また、積算電力Ｐを用いて調理内容を判断するので、加熱出力設定値ＷＨによらずに調理内容を判断できる。 Generally, when the cooking content is fried food, since the cook is near the pan 12, it is not necessary to detect scorching with an induction heating cooker. According to the present embodiment, it is determined whether the cooking content is a fried food or a boiled food. When the cooking content is a fried food, it is prohibited to control the inverter circuit 8 in response to the burned information signal S13. On the other hand, when the cooking content is boiled food, the heating operation is stopped or the heating output is reduced based on the burnt information signal S13. Therefore, the inverter based on the burned information signal SB according to the cooking content (boiled or fried) without imposing a predetermined operation on the user to automatically detect burnt such as selection of the cooking mode. The control of the circuit 8 (the process of step S18) can be executed or prohibited. For this reason, heating is not stopped unnecessarily or the heating output is not weakened at the time of cooking the stir-fried food, so that the usability can be improved as compared with the prior art. Moreover, since the cooking content is determined using the integrated power P, the cooking content can be determined regardless of the heating output set value WH.
　なお、本実施形態において、積算電力Ｐが所定の積算電力Ｐ１に到達したときの赤外線センサ１１の出力電圧ＶＴに基づいて調理内容が炒め物であるか又は煮物であるかを判断したが、本発明はこれに限られない。例えば、出力電圧ＶＴが所定の出力電圧に到達したときの積算電力Ｐに基づいて調理内容が炒め物であるか又は煮物であるかを判断してもよい。 In the present embodiment, it is determined whether the cooking content is a fried food or a boiled food based on the output voltage VT of the infrared sensor 11 when the integrated power P reaches a predetermined integrated power P1. The invention is not limited to this. For example, it may be determined whether the cooking content is a fried food or a boiled food based on the integrated power P when the output voltage VT reaches a predetermined output voltage.
（第２の実施形態）
　図７は、本発明の第２の実施形態に係る加熱処理を示すフローチャートである。図７において、ステップＳ１０～Ｓ１３における各処理は、第１の実施形態に係る加熱処理（図４参照。）のステップＳ１０～ステップＳ１３における各処理と同一であるので、説明を省略する。本実施形態に係る加熱処理は、選択された加熱出力設定値ＷＨが大きいほどしきい値積算電力ＰＴが小さくなるようにしきい値積算電力ＰＴを設定することを特徴としている。また、選択された加熱出力設定値ＷＨが所定の加熱出力設定値（本実施形態では、２０００Ｗである。）より高いとき、焦げ付き情報信号ＳＢに応答してインバータ回路８を制御することを禁止し、積算電力Ｐの測定を継続するように積算電力測定部１５を制御することを特徴としている。 (Second Embodiment)
FIG. 7 is a flowchart showing the heat treatment according to the second embodiment of the present invention. In FIG. 7, the processes in steps S10 to S13 are the same as the processes in steps S10 to S13 of the heating process (see FIG. 4) according to the first embodiment, and thus the description thereof is omitted. The heat treatment according to the present embodiment is characterized in that the threshold integrated power PT is set such that the threshold integrated power PT decreases as the selected heating output set value WH increases. Further, when the selected heating output setting value WH is higher than a predetermined heating output setting value (2000 W in this embodiment), it is prohibited to control the inverter circuit 8 in response to the burned information signal SB. The integrated power measuring unit 15 is controlled so as to continue the measurement of the integrated power P.
　図７のステップＳ１３に続いて、ステップＳ１４において、制御部９は、加熱出力設定値ＷＨが２０００Ｗより高いか否かを判断し、ＹＥＳのときはステップＳ１９に進む一方、ＮＯのときはステップＳ３０に進む。そして、ステップＳ１９において、制御部９は焦げ付き情報信号ＳＢに応答してインバータ回路８を制御することを禁止して（すなわち、ステップＳ１８の処理を実行することなく）、加熱動作を継続し、ステップＳ４１に進む。このとき、制御部９は、積算電力測定部１５の動作を停止しない（すなわち、積算電力Ｐの測定を継続するように積算電力測定部１５を制御する。）ステップＳ４１において制御部９は、加熱出力設定値ＷＨが変更されたか否かを判断し、ＹＥＳのときはステップＳ４０に戻る一方、ＮＯのときはステップＳ４１の処理を繰り返して実行する。 Following step S13 in FIG. 7, in step S14, the control unit 9 determines whether or not the heating output set value WH is higher than 2000 W. If YES, the process proceeds to step S19, and if NO, step S30. Proceed to In step S19, the control unit 9 prohibits the control of the inverter circuit 8 in response to the burned information signal SB (that is, without executing the process of step S18), and continues the heating operation. Proceed to S41. At this time, the control unit 9 does not stop the operation of the integrated power measurement unit 15 (that is, controls the integrated power measurement unit 15 so as to continue the measurement of the integrated power P). It is determined whether or not the output set value WH has been changed. If YES, the process returns to step S40. If NO, the process of step S41 is repeated.
　図８は、図７のステップＳ３０における調理内容判断処理を示すフローチャートである。図８のステップＳ３１において、制御部９は加熱出力設定値ＷＨが１５００Ｗより高いか否かを判断し、ＹＥＳのときはステップＳ３５に進む一方、ＮＯのときはステップＳ３２に進む。また、ステップＳ３２において、制御部９は加熱出力設定値ＷＨが１５００Ｗより低いか否かを判断し、ＹＥＳのときはステップＳ３４に進む一方、ＮＯのときはステップＳ３３に進む。そして、加熱出力設定値ＷＨが１５００Ｗより低いとき、ステップＳ３３においてしきい値積算電力ＰＴは所定の積算電力Ｐ１に設定され、加熱出力設定値ＷＨが１５００Ｗに等しいとき、ステップＳ３４においてしきい値積算電力ＰＴは所定の積算電力Ｐ３に設定され、加熱出力設定値ＷＨが１５００Ｗより高いとき、ステップＳ３５においてしきい値積算電力ＰＴは所定の積算電力Ｐ２に設定される。 FIG. 8 is a flowchart showing the cooking content determination process in step S30 of FIG. In step S31 of FIG. 8, the controller 9 determines whether or not the heating output set value WH is higher than 1500 W. If YES, the process proceeds to step S35, and if NO, the process proceeds to step S32. In step S32, the controller 9 determines whether or not the heating output set value WH is lower than 1500 W. If YES, the process proceeds to step S34, and if NO, the process proceeds to step S33. When the heating output set value WH is lower than 1500 W, the threshold integrated power PT is set to a predetermined integrated power P1 in step S33, and when the heating output set value WH is equal to 1500 W, the threshold integrated power is set in step S34. The power PT is set to a predetermined integrated power P3, and when the heating output set value WH is higher than 1500 W, the threshold integrated power PT is set to the predetermined integrated power P2 in step S35.
　図８において、ステップＳ３３、Ｓ３４及びＳ３５に続いて、ステップＳ３６において制御部９は積算電力Ｐがしきい値積算電力ＰＴ以上であるか否かを判断し、ＹＥＳのときはステップＳ３９に進む一方、ＮＯのときはステップＳ３８に進む。ステップＳ３８において制御部９は、調理内容は煮物であると判断して図７のステップＳ２１に戻る。また、ステップＳ３９において制御部９は、調理内容は炒め物であると判断して図７のステップＳ２１に戻る。なお、積算電力Ｐ１，Ｐ２及びＰ３は、Ｐ２＜Ｐ１＜Ｐ３であるように設定される。 In FIG. 8, following step S33, S34 and S35, in step S36, the control unit 9 determines whether or not the integrated power P is greater than or equal to the threshold integrated power PT. If YES, the process proceeds to step S39. If NO, the process proceeds to step S38. In step S38, the control unit 9 determines that the cooking content is boiled food and returns to step S21 in FIG. In step S39, the control unit 9 determines that the cooking content is fried food and returns to step S21 in FIG. The integrated powers P1, P2, and P3 are set so that P2 <P1 <P3.
　図７のステップＳ２１において、制御部９は調理内容が炒め物であるか否かを判断し、ＹＥＳのときはステップＳ１９に進む一方、ＮＯのときはステップＳ１７に進む。そして、Ｓ１７において、制御部９は、焦げ付き検知部１３から焦げ付き情報信号ＳＢを入力したか否かを判断し、ＹＥＳのときはステップＳ１８に進む一方、ＮＯのときはステップＳ１７の処理を繰り返して実行する。そして、ステップＳ１８において、制御部９は加熱動作を停止し又は加熱出力を低下させるようにインバータ回路８を制御し、加熱処理を終了する。 7, the control unit 9 determines whether or not the cooking content is fried food. If YES, the process proceeds to step S19. If NO, the process proceeds to step S17. In S17, the control unit 9 determines whether or not the burn information signal SB is input from the burn detection unit 13. When YES, the control unit 9 proceeds to step S18, and when NO, repeats the process of step S17. Execute. And in step S18, the control part 9 controls the inverter circuit 8 so that a heating operation may be stopped or a heating output may be reduced, and a heating process is complete | finished.
　図９において、（ａ）は図７の加熱処理が実行されたときの加熱開始からの経過時間と加熱出力設定値ＷＨの関係の一例を示すグラフであり、（ｂ）は図７の加熱処理が実行されたときの加熱開始からの経過時間としきい値積算電力ＰＴとの関係の一例を示すグラフと、経過時間と積算電力Ｐとの関係の一例を示すグラフである。図９（ａ）に示すように、加熱出力設定値ＷＨが１５００Ｗから２０００Ｗに変更され、さらに１０００Ｗに変更された場合、図９（ｂ）に示すように、しきい値積算電力ＰＴは積算電力Ｐ１から積算電力Ｐ２に変更され、さらに積算電力Ｐ３に変更される。 9, (a) is a graph showing an example of the relationship between the elapsed time from the start of heating and the heating output set value WH when the heating process of FIG. 7 is executed, and (b) is the heating process of FIG. 5 is a graph showing an example of the relationship between the elapsed time from the start of heating and the threshold integrated power PT when the is executed, and a graph showing an example of the relationship between the elapsed time and the integrated power P. As shown in FIG. 9A, when the heating output set value WH is changed from 1500 W to 2000 W, and further changed to 1000 W, the threshold integrated power PT is integrated power as shown in FIG. 9B. It is changed from P1 to integrated power P2, and further to integrated power P3.
　一般に、加熱出力設定値ＷＨが小さくなるほど、放熱速度との関係によって、熱のロスが大きくなる。従って、加熱出力設定値ＷＨが大きな場合と比較して、同じ積算電力であっても温度上昇幅が小さくなる。すなわち、加熱出力設定値ＷＨが小さい程、鍋１２が焦げ付くまでに入力される積算電力ＰＴは大きくなる。本実施形態に係る図８の調理内容判断処理によれば、加熱出力設定値ＷＨが１０００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ３に設定し、加熱出力設定値ＷＨが１５００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ１に設定し、加熱出力設定値ＷＨが２０００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ２に設定したので、第１の実施形態に比較して高い精度で調理内容を判断できる。 Generally, the smaller the heating output set value WH, the greater the heat loss due to the relationship with the heat dissipation rate. Therefore, as compared with the case where the heating output set value WH is large, the temperature increase width is small even with the same integrated power. That is, as the heating output set value WH is smaller, the integrated power PT that is input until the pan 12 is burnt becomes larger. According to the cooking content determination process of FIG. 8 according to the present embodiment, when the heating output set value WH is 1000 W, the threshold integrated power PT is set to the integrated power P3, and the heating output set value WH is 1500 W. When the threshold integrated power PT is set to the integrated power P1, and when the heating output set value WH is 2000 W, the threshold integrated power PT is set to the integrated power P2. Compared to the first embodiment, The cooking content can be judged with high accuracy.
　また、本実施形態に係る図８の調理内容判断処理によれば、加熱処理中に加熱出力設定値ＷＨが変更されても、変更後の加熱出力設定値ＷＨに基づいてしきい値積算電力ＰＴを設定しなおす。このため、調理中に加熱出力設定値ＷＨの変更に伴って鍋１２の底の温度上昇率が大きく変化する場合にも、第１の実施形態に比較して高い精度で調理内容を判断でき、炒め物調理中に焦げ付きが誤って検知されてステップＳ１８の処理が実行されて調理に支障をきたすということがなく、煮物調理中にのみ焦げ付き情報信号ＳＢに基づく制御を実行できる。 Further, according to the cooking content determination process of FIG. 8 according to the present embodiment, even if the heating output set value WH is changed during the heating process, the threshold integrated power PT is based on the changed heating output set value WH. Set again. For this reason, even when the rate of temperature increase at the bottom of the pan 12 greatly changes with the change of the heating output set value WH during cooking, the cooking content can be determined with high accuracy compared to the first embodiment, It is possible to execute the control based on the burnt information signal SB only during the cooking of the simmered food, without causing the burning in the fried food to be erroneously detected and causing the processing of step S18 to be hindered.
　さらに、出力設定値ＷＨが２０００Ｗより高いときは焦げ付き情報信号ＳＢに応答してインバータ回路８を制御することを禁止して（すなわち、ステップＳ１８の処理を実行することなく）、加熱動作を継続するので、高火力が必要な負荷の重たい炒め物のときに、誤って焦げ付き検知を行い調理に影響がでることを防ぐことが出来る。そして、加熱出力設定値ＷＨが２０００Ｗ以下に変更されると、調理内容判断処理を実行するので、例えば、まず始めに高火力で炒めた後に低火力に変更して煮込みを行う調理（例えば、肉じゃが及び筑前煮などの調理。）の場合にも、調理モードの変更又は焦げ付き防止スイッチ操作などの焦げ付き検知機能（焦げ付き情報信号ＳＢに応答してインバータ回路８を制御する機能である。）を動作させるか否かを切り替えるための操作を使用者に課すことなく、焦げ付き情報信号ＳＢに基づくインバータ回路８の制御を実行できる。 Further, when the output set value WH is higher than 2000 W, the control of the inverter circuit 8 is prohibited in response to the burned information signal SB (that is, without performing the process of step S18), and the heating operation is continued. Therefore, when a heavy fried food with a high heating power is required, it is possible to prevent scorching from being accidentally detected and affect cooking. Then, when the heating output set value WH is changed to 2000 W or less, the cooking content determination process is executed. For example, the cooking is performed by firstly frying with high heating power and then changing to low heating power (for example, meat potato) Also, in the case of cooking such as Chikuzenni, the burn-in detection function (the function of controlling the inverter circuit 8 in response to the burn-in information signal SB) such as changing the cooking mode or operating the burn-in prevention switch is operated. Control of the inverter circuit 8 based on the burned information signal SB can be performed without imposing an operation for switching whether or not the user is on.
　以上説明したように、本実施形態によれば、焦げ付き検知機能を動作させるか否かを切り替えるための操作を使用者に課すことなく、使用者が加熱出力設定値ＷＨを変更可能な加熱モードで調理を行っても、調理内容が煮物であるときに焦げ付き検知情報信号ＳＢに基づくインバータ回路８の制御を実行できる。さらに、加熱出力設定値ＷＨに関わらず、調理内容が炒め物であるか又は煮物であるかを第１の実施形態に比較して高い精度で判断できる。また、調理中に加熱出力設定値ＷＨが変更されても、調理内容が炒め物であるか又は煮物であるかを第１の実施形態に比較して高い精度で判断できる。さらに、炒め物調理中に焦げ付き情報信号ＳＢに基づくインバータ回路８の制御が行われることがなく、煮物調理中に焦げ付き情報信号ＳＢに基づく制御を実行できる。 As described above, according to the present embodiment, in the heating mode in which the user can change the heating output set value WH without imposing an operation for switching whether or not to operate the burn detection function on the user. Even when cooking is performed, control of the inverter circuit 8 based on the burnt detection information signal SB can be executed when the cooking content is boiled food. Furthermore, irrespective of the heating output set value WH, it can be determined with high accuracy whether the cooking content is a fried food or a boiled food compared to the first embodiment. Further, even if the heating output set value WH is changed during cooking, it can be determined with high accuracy whether the cooking content is a fried food or a boiled food compared to the first embodiment. Further, the control of the inverter circuit 8 based on the burnt information signal SB is not performed during the cooking of the fried food, and the control based on the burnt information signal SB can be executed during the cooking of the boiled food.
　なお、本実施形態において、加熱出力設定値ＷＨが１０００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ３に設定し、加熱出力設定値ＷＨが１５００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ１に設定し、加熱出力設定値ＷＨが２０００Ｗであるときはしきい値積算電力ＰＴを積算電力Ｐ２に設定したが、本発明はこれに限られず、加熱出力設定値ＷＨが大きいほどしきい値積算電力ＰＴが小さくなるように、しきい値積算電力ＰＴを小さく設定すればよい。 In this embodiment, when the heating output set value WH is 1000 W, the threshold integrated power PT is set to the integrated power P3, and when the heating output set value WH is 1500 W, the threshold integrated power PT is set. When the integrated power P1 is set and the heating output set value WH is 2000 W, the threshold integrated power PT is set to the integrated power P2. However, the present invention is not limited to this, and the heating output set value WH is increased. The threshold integrated power PT may be set small so that the threshold integrated power PT becomes small.
（実施の形態３）
　図１０は、本発明の第３の実施形態に係る誘導加熱部３Ａの構成を示すブロック図である。本実施形態に係る誘導加熱部３Ａは、第１の実施形態に係る誘導加熱部３に比較して、インバータ回路８に入力される入力電流及びインバータ回路８共振電圧の共振電圧計測部１６と、測定された入力電流及び共振電圧に基づいて鍋１２の材質を判別する鍋種判別部１７とをさらに備え、制御部９に代えて制御部９Ａを備えたことを特徴としている。ここで、制御部９Ａは、鍋種判別部１７により判別された鍋１２の材質の熱伝導度が大きいほど、しきい値積算電力ＰＴが大きくなるようにしきい値積算電力ＰＴを設定することを特徴としている。 (Embodiment 3)
FIG. 10 is a block diagram showing a configuration of an induction heating unit 3A according to the third embodiment of the present invention. Compared with the induction heating unit 3 according to the first embodiment, the induction heating unit 3A according to the present embodiment includes an input current input to the inverter circuit 8 and a resonance voltage measurement unit 16 of the inverter circuit 8 resonance voltage, A pan type discriminating unit 17 for discriminating the material of the pan 12 based on the measured input current and resonance voltage is further provided, and a control unit 9A is provided instead of the control unit 9. Here, the control unit 9A sets the threshold integrated power PT so that the threshold integrated power PT increases as the thermal conductivity of the material of the pan 12 determined by the pot type determining unit 17 increases. It is a feature.
　図１０において、計測部１６は、例えば変流器である入力電流検出回路９２を用いて、商用交流電源９１から整流平滑回路９３への入力電流を検出するとともに、例えば計測用変圧器（ＶＴ（Voltage Transformer））を用いて、インバータ回路８の共振コンデンサ８１（図３参照。）の共振電圧を検出し、検出された入力電流と共振電圧とを示す信号を鍋種判別部１７に出力する。また、鍋種判別部１７は、検出された入力電流とあらかじめ設定された第１の電流値との間の差と、検出された共振電圧と予め設定された第２の電圧値との差に基づいて鍋１２の材質を判別し、当該判別結果を示す鍋種判別信号ＳＢを発生して制御部９Ａに出力する。具体的には、鍋種判別部１７は、特許文献３又は４記載の誘導加熱調理器と同様に、入力電流に対する共振電圧の特性に基づいて鍋１２の材質を判別する。 In FIG. 10, the measurement unit 16 detects an input current from the commercial AC power supply 91 to the rectifying / smoothing circuit 93 using an input current detection circuit 92 that is, for example, a current transformer, and, for example, a measurement transformer (VT ( Voltage Transformer)) is used to detect the resonance voltage of the resonance capacitor 81 (see FIG. 3) of the inverter circuit 8, and a signal indicating the detected input current and resonance voltage is output to the pot type discrimination unit 17. Further, the pot type discriminating unit 17 determines the difference between the detected input current and the preset first current value, and the difference between the detected resonance voltage and the preset second voltage value. Based on this, the material of the pan 12 is discriminated, and a pan type discrimination signal SB indicating the discrimination result is generated and output to the control unit 9A. Specifically, the pan type discriminating unit 17 discriminates the material of the pan 12 based on the characteristic of the resonance voltage with respect to the input current, similarly to the induction heating cooker described in Patent Document 3 or 4.
　図１１は、図１０の制御部９Ａによって実行される加熱処理を示すフローチャートである。図１０の加熱処理は、図４の加熱処理に比較して、ステップＳ１４の処理に代えてステップＳ２０及びＳ１４Ａの処理を含むことを特徴としている。ステップＳ１３に続いて、ステップＳ２０において、制御部９Ａは鍋種判別信号ＳＰに基づいてしきい値積算電力ＰＴの補正値ΔＰを決定する。具体的には、鍋１２の材質の熱伝導度が大きいほど補正値ΔＰが大きくなり、鍋１２の材質の熱伝導度が小さいほど補正値ΔＰが小さくなるように補正値ΔＰを決定する。次に、ステップＳ１４Ａにおいて、制御部９Ａは積算電力Ｐ１に補正値ΔＰ１を加算し、加算後の積算電力をしきい値積算電力ＰＴに設定し、ステップＳ１５に進む。 FIG. 11 is a flowchart showing the heating process executed by the control unit 9A of FIG. The heat treatment of FIG. 10 is characterized by including the processes of steps S20 and S14A instead of the process of step S14, as compared with the heat treatment of FIG. Subsequent to step S13, in step S20, the control unit 9A determines a correction value ΔP for the threshold integrated power PT based on the pan type determination signal SP. Specifically, the correction value ΔP is determined so that the correction value ΔP increases as the thermal conductivity of the material of the pot 12 increases, and the correction value ΔP decreases as the thermal conductivity of the material of the pot 12 decreases. Next, in step S14A, the control unit 9A adds the correction value ΔP1 to the integrated power P1, sets the integrated power after the addition to the threshold integrated power PT, and proceeds to step S15.
　一般に、鍋１２の材質が、例えばアルミニウムのような比較的大きい熱伝導率を有する場合、鍋１２において発生した熱の周囲への拡散量が比較的大きく、出力電圧ＶＴの勾配が小さくなる傾向がある。また、鍋１２の材質が、非磁性のステンレスのような比較的小さい熱伝導率を有する場合、鍋１２において発生した熱の周囲への拡散量が比較的小さく、出力電圧ＶＴの勾配が大きくなる傾向がある。このため、鍋１２の材質がアルミニウムである場合に比較して、調理内容の判別を行うことが難しい。本実施形態によれば、鍋１２の材質の熱伝導度に応じてしきい値積算電力ＰＴを設定するので、鍋１２の材質に関係なく、第１の実施形態に比較して高い精度で調理内容が炒め物であるか又は煮物であるかを判断できる。さらに、第１の実施形態と同様に、炒め物調理中に焦げ付きが誤って検知されてステップＳ１８の処理が実行されて調理に支障をきたすということがなく、煮物調理中にのみ焦げ付き情報信号ＳＢに基づく制御を実行できる。 Generally, when the material of the pan 12 has a relatively large thermal conductivity such as aluminum, for example, the amount of heat generated in the pan 12 is relatively large and the gradient of the output voltage VT tends to be small. is there. Further, when the material of the pan 12 has a relatively low thermal conductivity such as non-magnetic stainless steel, the amount of heat generated in the pan 12 to the surroundings is relatively small, and the gradient of the output voltage VT becomes large. Tend. For this reason, compared with the case where the material of the pan 12 is aluminum, it is difficult to discriminate cooking contents. According to this embodiment, since the threshold integrated power PT is set according to the thermal conductivity of the material of the pan 12, cooking is performed with higher accuracy than the first embodiment regardless of the material of the pan 12. It can be judged whether the content is a fried food or a boiled food. Further, as in the first embodiment, the burn information is not detected during the cooking of the stir-fry, and the processing of step S18 is not performed and the cooking is not hindered. The burn information signal SB only during the cooking of the boiled food. Control based on can be executed.
　なお、計測部１６は、共振コンデンサ８１の共振電圧を検出したが、本発明はこれに限られず、共振コンデンサ８１の共振電流を検出することにより共振電圧を検出してもよい。また、計測部１６は、インバータ回路８に入力される電流とインバータ回路８の共振電圧を検出できればよい。 The measurement unit 16 detects the resonance voltage of the resonance capacitor 81, but the present invention is not limited to this, and the resonance voltage may be detected by detecting the resonance current of the resonance capacitor 81. Moreover, the measurement part 16 should just be able to detect the electric current input into the inverter circuit 8, and the resonant voltage of the inverter circuit 8. FIG.
　また、第２の実施形態に係る調理内容判断処理（図８）において、ステップＳ３３、Ｓ３４及びＳ３５の各処理と、ステップＳ３６の処理との間に、ステップＳ２０及びＳ１４Ａの処理を実行してもよい。 Moreover, in the cooking content determination process (FIG. 8) according to the second embodiment, even if the processes of steps S20 and S14A are executed between the processes of steps S33, S34 and S35 and the process of step S36. Good.
（第４の実施形態）
　図１２は、本発明の第４の実施形態に係る誘導加熱部３Ｂの構成の構成を示すグラフである。本実施形態に係る誘導加熱部３Ｂは、第１の実施形態に係る誘導加熱部３に比較して、第３の実施形態に係る誘導加熱調理器の計測部１６と同様の計測部１６と、測定された入力電流及び共振電圧に基づいて、トッププレート２上に鍋１２があるか否かを判別する鍋無し検知部１８とをさらに備え、制御部９に代えて制御部９Ｂを備えたことを特徴としている。ここで、制御部９Ｂは、鍋無し検知部１８によりトッププレート２上に鍋１２が無いと判別された場合、積算電力測定部１５を、積算電力Ｐを初期化するように制御することを特徴としている。 (Fourth embodiment)
FIG. 12 is a graph showing the configuration of the configuration of the induction heating unit 3B according to the fourth embodiment of the present invention. The induction heating unit 3B according to the present embodiment has a measurement unit 16 similar to the measurement unit 16 of the induction heating cooker according to the third embodiment, as compared to the induction heating unit 3 according to the first embodiment. A panless detector 18 for determining whether there is a pan 12 on the top plate 2 based on the measured input current and resonance voltage, and a controller 9B instead of the controller 9 It is characterized by. Here, the control unit 9B controls the integrated power measuring unit 15 to initialize the integrated power P when the panless detecting unit 18 determines that there is no pan 12 on the top plate 2. It is said.
　図１２において、計測部１６は、第２の実施形態に係る誘導加熱調理器の計測部１６と同様に構成され、例えば変流器である入力電流検出回路９２を用いて、商用交流電源９１から整流平滑回路９３に入力される入力電流を検出するとともに、例えば計測用変圧器を用いて、インバータ回路８の共振コンデンサ８１（図３参照。）の共振電圧を検出し、検出された入力電流と共振電圧とを示す信号を鍋無し検知部１８に出力する。また、鍋無し検知部１８は、検出された入力電流とあらかじめ設定された第２の電流値との間の差と、検出された共振電圧と予め設定された第２の電圧値との差に基づいてトッププレート２上に鍋１２があるか否かを検知し、当該検知結果を示す鍋無し検知信号ＳＮを発生して制御部９Ｂに出力する。一般に、トッププレート２上に鍋１２が無いときは、鍋１２があるときに比較して、入力電流に対して共振電圧は急峻に立ち上がる特性を有する。鍋無し検知部１８は、鍋１２があるときと無いときの共振電圧の特性の差を利用して鍋１２の有無を判断する（例えば、特許文献３参照。）。 In FIG. 12, the measurement part 16 is comprised similarly to the measurement part 16 of the induction heating cooking appliance which concerns on 2nd Embodiment, for example, from the commercial alternating current power supply 91 using the input current detection circuit 92 which is a current transformer. The input current input to the rectifying and smoothing circuit 93 is detected, and the resonance voltage of the resonance capacitor 81 (see FIG. 3) of the inverter circuit 8 is detected using, for example, a measurement transformer, and the detected input current and A signal indicating the resonance voltage is output to the panless detector 18. Further, the no pan detection unit 18 determines the difference between the detected input current and the preset second current value, and the difference between the detected resonance voltage and the preset second voltage value. Based on this, it is detected whether or not there is a pan 12 on the top plate 2, and a panless detection signal SN indicating the detection result is generated and output to the control unit 9B. In general, when there is no pan 12 on the top plate 2, the resonance voltage rises sharply with respect to the input current as compared with when the pan 12 is present. The panless detector 18 determines the presence or absence of the pan 12 using the difference in the resonance voltage characteristics between when the pan 12 is present and when it is absent (see, for example, Patent Document 3).
　制御部９は、図４の加熱処理を実行しているときに鍋１２が無いことを示す鍋無し検知信号ＳＮを入力すると、積算電力Ｐをゼロに初期化して積算電力Ｐの測定を再開するように積算電力測定部１５を制御し、ステップＳ１４に進む。従って、本実施形態に係る誘導加熱調理器は、例えば以下のように動作する。 When the control unit 9 inputs the no pan detection signal SN indicating that there is no pan 12 when the heating process of FIG. 4 is being performed, the control unit 9 initializes the integrated power P to zero and restarts the measurement of the integrated power P. Thus, the integrated power measuring unit 15 is controlled, and the process proceeds to step S14. Therefore, the induction heating cooker according to the present embodiment operates as follows, for example.
（１）図４のステップＳ１６において調理内容が炒め物であると判断された後に、使用者が鍋１２をトッププレート２から離し、再び同じ鍋１２をトッププレート２に置いたとき。この場合、鍋１２がトッププレート２から離れたとき、鍋１２が無いことを示す鍋無し検知信号ＳＮが発生される。これに応答して積算電力Ｐはゼロに初期化され、ステップＳ１４に戻る。そして、ステップＳ１５において積算電力Ｐがしきい値積算電力ＰＴに到達せずに調理が終了するか、あるいはステップＳ１６において調理内容が炒め物であると判断される。このため、焦げ付き情報信号ＳＢに基づくインバータ回路８の制御（ステップＳ１８の処理）は実行されないので、使用者は、選択した加熱出力設定値ＷＨで炒め物調理を継続できる。 (1) When it is determined in step S16 of FIG. 4 that the cooking content is fried food, the user moves the pan 12 away from the top plate 2 and places the same pan 12 on the top plate 2 again. In this case, when the pan 12 is separated from the top plate 2, a panless detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. Then, it is determined in step S15 that the integrated power P does not reach the threshold integrated power PT and cooking is completed, or in step S16, the cooking content is a fried food. For this reason, since the control of the inverter circuit 8 based on the burned information signal SB (the process of step S18) is not executed, the user can continue cooking the fried food with the selected heating output set value WH.
（２）図４のステップＳ１６において調理内容が煮物であると判断された後に、使用者が鍋１２をトッププレート２から離し、再び同じ鍋１２をトッププレート２に置いたとき。この場合、鍋１２がトッププレート２から離れたとき、鍋１２が無いことを示す鍋無し検知信号ＳＮが発生される。これに応答して積算電力Ｐはゼロに初期化され、ステップＳ１４に戻る。そして、ステップＳ１５の判断処理が繰り返して実行される。ここで、ステップＳ１４における積算電力Ｐ１は、積算電力Ｐの測定開始からステップＳ１５における判断処理においてＹＥＳと判断されるまでの時間が例えば１００秒から２００秒までの時間になるように設定される。一般に、使用者が鍋１２をトッププレート２から離し、再び同じ鍋１２をトッププレート２に再び置く場合、１００秒～２００秒以内に焦げ付く可能性があるときは使用者は鍋１２そばにいて鍋１２を監視していると考えられる。このため、ステップＳ１５の処理が繰り返して実行されている間に鍋１２が焦げ付きそうになっても、使用者が加熱出力設定値ＷＨの変更などの焦げ付きを回避する操作を行うので、問題ない。 (2) When it is determined in step S16 of FIG. 4 that the cooking content is boiled food, the user moves the pan 12 away from the top plate 2 and places the same pan 12 on the top plate 2 again. In this case, when the pan 12 is separated from the top plate 2, a panless detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. Then, the determination process of step S15 is repeatedly executed. Here, the integrated power P1 in step S14 is set so that the time from the start of measurement of integrated power P to YES in the determination process in step S15 is, for example, 100 seconds to 200 seconds. In general, when the user moves the pan 12 away from the top plate 2 and puts the same pan 12 on the top plate 2 again, if the user may be burned within 100 to 200 seconds, the user will be near the pan 12 and the pan. 12 is considered to be monitored. For this reason, even if the pan 12 is likely to be burned while the process of step S15 is repeatedly executed, there is no problem because the user performs an operation for avoiding burn such as changing the heating output set value WH.
（３）図４のステップＳ１６において調理内容が炒め物であると判断された後に、使用者が鍋１２をトッププレート２から離し、煮物調理のための別の鍋１２をトッププレート２に置いたとき。この場合、炒め物調理のための鍋１２がトッププレート２から離れたとき、鍋１２が無いことを示す鍋無し検知信号ＳＮが発生される。これに応答して積算電力Ｐはゼロに初期化され、ステップＳ１４に戻る。そして、図４の調理内容判断処理において、調理内容は煮物であると判断される。従って、焦げ付き情報信号ＳＢが発生された場合は、焦げ付き情報信号ＳＢに基づくインバータ回路８の制御（ステップＳ１８の処理）が実行される。 (3) After it is determined in step S16 of FIG. 4 that the cooking content is fried food, the user moves the pan 12 away from the top plate 2 and places another pan 12 for cooking the stew on the top plate 2. When. In this case, when the pan 12 for cooking the stir-fry is separated from the top plate 2, the no pan detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. And in the cooking content determination process of FIG. 4, it is determined that the cooking content is boiled food. Therefore, when the burnt information signal SB is generated, control of the inverter circuit 8 based on the burnt information signal SB (processing in step S18) is executed.
（４）図４のステップＳ１６において調理内容が煮物であると判断された後に、使用者が鍋１２をトッププレート２から離し、炒め物調理のための別の鍋１２をトッププレート２に置いたとき。この場合、煮物調理のための鍋１２がトッププレート２から離れたとき、鍋１２が無いことを示す鍋無し検知信号ＳＮが発生される。これに応答して積算電力Ｐはゼロに初期化され、ステップＳ１４に戻る。そして、図４の調理内容判断処理において、調理内容は炒め物であると判断される。このため、焦げ付き情報信号ＳＢに基づくインバータ回路８の制御（ステップＳ１８の処理）は実行されないので、使用者は、選択した加熱出力設定値ＷＨで炒め物調理を行える。 (4) After it is determined in step S16 of FIG. 4 that the cooking content is boiled food, the user separates the pan 12 from the top plate 2 and puts another pan 12 for cooking the fried food on the top plate 2. When. In this case, when the pan 12 for cooking boiled food is separated from the top plate 2, the no pan detection signal SN indicating that there is no pan 12 is generated. In response to this, the integrated power P is initialized to zero, and the process returns to step S14. And in the cooking content determination process of FIG. 4, it is determined that the cooking content is fried food. For this reason, since the control of the inverter circuit 8 based on the burned information signal SB (step S18) is not executed, the user can cook the fried food with the selected heating output set value WH.
　従って、本実施形態によれば、鍋１２がトッププレート２上から離れたときに、鍋１２が無いことを示す鍋無し検知信号ＳＮが発生されて積算電力Ｐが初期化されるので、使用者が一旦調理を終了した後に、加熱開始スイッチ６ｓ及び誘導加熱調理器の電源をオフオンせずに鍋１２を取り替えて次の調理を行っても、次の調理内容が炒め物であるか煮物であるかを高い精度で判断できる。特に、使用者が煮物調理のための鍋１２を炒め物調理のための鍋１２に置き換えたとき、炒め物調理中に焦げ付きが誤って検知されて調理に支障をきたすことがない。 Therefore, according to the present embodiment, when the pan 12 is separated from the top plate 2, the panless detection signal SN indicating that there is no pan 12 is generated and the integrated power P is initialized. Once the cooking is finished, even if the pan 12 is replaced without turning on the heating start switch 6s and the induction heating cooker and the next cooking is performed, the next cooking content is fried or boiled. Can be determined with high accuracy. In particular, when the user replaces the pan 12 for cooking simmered food with the pan 12 for cooking sautéed food, scoring is not erroneously detected during cooking of the fried food, and cooking is not hindered.
　なお、本実施形態に係る鍋無し検知部１８を、第２の実施形態又は第３の実施形態に係る誘導加熱調理器に設けて、鍋１２が無いことを示す鍋無し検知信号ＳＮを入力すると、積算電力Ｐをゼロに初期化して積算電力Ｐの測定を再開するように積算電力測定部１５を制御してもよい。また、上記各実施形態において、積算電力測定部１５は制御部９，９Ａ又は９Ｂからの制御に基づいて積算電力Ｐの測定を開始したが、本発明はこれに限られない。鍋無し検知部１８備えた誘導加熱料理器の場合、積算電力測定部１５を、鍋１２があることを示す鍋無し検知信号ＳＮに応答して積算電力Ｐの測定を開始するように構成してもよい。 In addition, when the panless detection part 18 which concerns on this embodiment is provided in the induction heating cooking appliance which concerns on 2nd Embodiment or 3rd Embodiment, and the panless detection signal SN which shows that there is no pan 12 is input. The integrated power measurement unit 15 may be controlled so that the integrated power P is initialized to zero and the measurement of the integrated power P is restarted. In each of the above embodiments, the integrated power measuring unit 15 starts measuring the integrated power P based on the control from the control unit 9, 9A or 9B, but the present invention is not limited to this. In the case of the induction heating cooker provided with the no pan detection unit 18, the integrated power measuring unit 15 is configured to start measuring the integrated power P in response to the no pan detection signal SN indicating that there is the pan 12. Also good.
　また、上記各実施形態において、赤外線センサ１１はＩｎＧａＡｓピンフォトダイオードであったが、本発明はこれに限られず、シリコンフォトダイオード又はサーモパイルなどの焦げ付きが発生する温度を含む温度範囲を赤外線を用いて検知できる素子であればよい。また、上記各実施形態において、赤外線センサ１１は加熱コイル７の近傍に設けられたが、本発明はこれに限られず、鍋１２の温度を検知できる位置に設けられればよい。 In each of the above embodiments, the infrared sensor 11 is an InGaAs pin photodiode. However, the present invention is not limited to this, and a temperature range including a temperature at which scorching occurs, such as a silicon photodiode or a thermopile, uses infrared rays. Any element that can be detected may be used. Moreover, in each said embodiment, although the infrared sensor 11 was provided in the vicinity of the heating coil 7, this invention is not restricted to this, What is necessary is just to be provided in the position which can detect the temperature of the pan 12. FIG.
　さらに、積算電力測定部１５は整流平滑回路９３に入力される電流を積算することにより積算電力Ｐを測定したが、本発明はこれに限られず、インバータ回路８への入力電流、加熱コイル７に流れるコイル電流又は共振コンデンサ８１の両端電圧（共振電圧である。）などの、負荷（鍋１２である。）を加熱するためにインバータ回路８に入力された電力に対応する電流及び／又は電圧を単位時間毎に検出し、検出された単位時間あたりの電流及び／又は電圧を積算することにより、インバータ回路８に入力される電力の積算電力Ｐを測定してもよい。 Further, the integrated power measuring unit 15 measures the integrated power P by integrating the current input to the rectifying and smoothing circuit 93. However, the present invention is not limited to this, and the input current to the inverter circuit 8 and the heating coil 7 are measured. A current and / or voltage corresponding to the power input to the inverter circuit 8 to heat the load (which is the pan 12), such as a flowing coil current or a voltage across the resonant capacitor 81 (which is the resonant voltage). The integrated power P of the power input to the inverter circuit 8 may be measured by detecting every unit time and integrating the detected current and / or voltage per unit time.
　またさらに、加熱開始時の鍋１２の出力電圧ＶＴが高いほどしきい値積算電力ＰＴが低くなるように、しきい値積算電力ＰＴを補正してもよい。 Furthermore, the threshold integrated power PT may be corrected so that the threshold integrated power PT decreases as the output voltage VT of the pan 12 at the start of heating increases.
　以上説明したように、本発明に係る誘導加熱調理器によれば、特定の調理モードの選択又は焦げ付き防止のための所定の機能の選択などの所定の操作を使用者に課すことなく、焦げ付き検知機能を動作させ又は停止でき、かつ、調理中に焦げ付きを誤って検知しない。このため、利用者が選択した加熱出力設定値において利用者の望む調理シーン（調理内容）を判別することにより、例えば煮物調理では焦げ付き検知機能が適切に動作するとともに、例えば炒め物のような調理では焦げ付き検知機能の誤検知をなくすことができ、加熱時の過昇防止の判定方法にも応用することが出来る。 As described above, according to the induction heating cooker according to the present invention, it is possible to detect scoring without imposing a predetermined operation on the user such as selection of a specific cooking mode or selection of a predetermined function for preventing scorching. The function can be activated or deactivated and does not falsely detect scorching during cooking. For this reason, by determining the cooking scene (cooking content) desired by the user based on the heating output setting value selected by the user, for example, in the cooking of boiled food, the scoring detection function operates properly and cooking such as fried food is performed. Then, it is possible to eliminate false detection of the burn-in detection function, and it can also be applied to a determination method for preventing overheating during heating.
１…外郭ケース、
２…トッププレート、
３，３Ａ，３Ｂ…誘導加熱部、
４…ラジェントヒータ部、
５…グリル、
６…操作表示部、
６ｓ…加熱開始スイッチ、
７…加熱コイル（誘導加熱コイル）、
８…インバータ回路、
９，９Ａ，９Ｂ…制御部、
１０…出力設定部、
１１…赤外線センサ、
１２…鍋、
１３…焦げ付き検知部、
１４…調理物、
１５…積算電力測定部、
１６…計測部、
１７…鍋種判別部、
１８…鍋無し検知部。 1 ... Outer case,
2 ... Top plate,
3, 3A, 3B ... induction heating unit,
4 ... Lagent heater section,
5 ... Grill,
6 ... operation display section,
6s ... Heating start switch,
7 ... heating coil (induction heating coil),
8 ... Inverter circuit,
9, 9A, 9B ... control unit,
10: Output setting unit,
11 ... Infrared sensor,
12 ...
13 ... Burn detection part,
14 ... Cooked food,
15 ... Integrated power measuring unit,
16 ... measurement part,
17 ... Pot type discrimination part,
18 ... No pan detection part.

Claims (8)

  1. 　鍋を載置するトッププレートと、
    　前記トッププレートの下に設けられかつ前記鍋を誘導加熱する誘導加熱コイルと、
    　前記誘導加熱コイルに高周波電流を供給するインバータ回路と、
    　前記鍋の底から放射され前記トッププレートを透過する赤外線を検知して前記鍋の底面温度に対応する出力電圧を出力する赤外線センサと、
    　複数の加熱出力設定値の中から１つの加熱出力設定値を選択するための出力設定部と、
    　前記誘導加熱コイルに高周波電流を供給しかつ加熱出力が前記選択された加熱出力設定値に対応する加熱出力となるように前記インバータ回路の動作を制御する制御部と、
    　前記赤外線センサの出力電圧が所定の第１出力電圧以上であるとき、前記鍋の底に調理物が焦げ付いたことを示す焦げ付き情報信号を発生して前記制御部に出力する焦げ付き検知部と、
    　前記インバータ回路に入力される電力の積算電力を測定する積算電力測定部とを備え、
    　前記制御部は、動作を開始するように前記インバータ回路を制御したとき前記積算電力の測定を開始するように前記積算電力測定部を制御し、前記積算電力測定部によって測定された積算電力が所定のしきい値積算電力に到達したとき、前記出力電圧が前記第１出力電圧より低い所定の第２出力電圧未満であるときは、前記焦げ付き情報信号に応答して加熱動作を停止し又は加熱出力を低下させるように前記インバータ回路を制御する一方、前記出力電圧が前記第２出力電圧以上であるときは、前記焦げ付き情報信号に応答して前記インバータ回路を制御することを禁止することを特徴とする誘導加熱調理器。     A top plate on which the pan is placed;
    An induction heating coil provided under the top plate and for induction heating the pan;
    An inverter circuit for supplying a high-frequency current to the induction heating coil;
    An infrared sensor that detects an infrared ray emitted from the bottom of the pan and passes through the top plate and outputs an output voltage corresponding to the bottom temperature of the pan;
    An output setting unit for selecting one heating output setting value from a plurality of heating output setting values;
    A controller for supplying a high-frequency current to the induction heating coil and controlling the operation of the inverter circuit so that the heating output becomes a heating output corresponding to the selected heating output setting value;
    When the output voltage of the infrared sensor is equal to or higher than a predetermined first output voltage, a scoring detection unit that generates a scoring information signal indicating that the food is scorched on the bottom of the pan and outputs the burned information signal to the control unit;
    An integrated power measuring unit that measures the integrated power of the power input to the inverter circuit,
    The control unit controls the integrated power measuring unit to start measuring the integrated power when the inverter circuit is controlled to start operation, and the integrated power measured by the integrated power measuring unit is predetermined. When the threshold integrated power is reached, if the output voltage is less than a predetermined second output voltage lower than the first output voltage, the heating operation is stopped in response to the burned information signal or the heating output And controlling the inverter circuit in response to the burned information signal when the output voltage is equal to or higher than the second output voltage. Induction heating cooker.
  2. 　前記制御部は、前記選択された加熱出力設定値が大きいほど前記しきい値積算電力が小さくなるように、前記しきい値積算電力を設定することを特徴とする請求項１に記載の誘導加熱調理器。 2. The induction heating according to claim 1, wherein the control unit sets the threshold integrated power so that the threshold integrated power decreases as the selected heating output setting value increases. Cooking device.
  3. 　前記インバータ回路に入力される入力電流及び前記インバータ回路の共振電圧を測定する計測部と、
    　前記測定された入力電流及び共振電圧に基づいて、前記鍋の材質を判別する鍋種判別部とをさらに備え、
    　前記制御部は、前記鍋種判別部により判別された前記鍋の材質の熱伝導度が大きいほど、前記しきい値積算電力が大きくなるように、前記しきい値積算電力を設定することを特徴とする請求項１又は２記載の誘導加熱調理器。     A measuring unit for measuring an input current input to the inverter circuit and a resonance voltage of the inverter circuit;
    A pan type discriminating unit for discriminating the material of the pan based on the measured input current and resonance voltage;
    The control unit sets the threshold integrated power so that the threshold integrated power increases as the thermal conductivity of the material of the pan determined by the pan type determining unit increases. The induction heating cooker according to claim 1 or 2.
  4. 　前記鍋種判別部は、前記測定された入力電流とあらかじめ設定された第１の電流値との差、及び前記測定された共振電圧とあらかじめ設定された第１の電圧値との差に基づいて、前記鍋の材質を判別することを特徴とする請求項３記載の誘導加熱調理器。 The pot type discriminating unit is based on a difference between the measured input current and a preset first current value, and a difference between the measured resonance voltage and a preset first voltage value. The induction heating cooker according to claim 3, wherein a material of the pan is discriminated.
  5. 　前記制御部は、前記選択された加熱出力設定値が所定の加熱出力設定値より高いとき、前記焦げ付き情報信号に応答して前記インバータ回路を制御することを禁止し、前記積算電力の測定を継続するように前記積算電力測定部を制御することを特徴とする請求項１から４のうちのいずれか１つに記載の誘導加熱調理器。 The control unit prohibits the control of the inverter circuit in response to the burned information signal when the selected heating output setting value is higher than a predetermined heating output setting value, and continues to measure the integrated power The induction heating cooker according to any one of claims 1 to 4, wherein the integrated power measuring unit is controlled to do so.
  6. 　前記インバータ回路に入力される入力電流及び前記インバータ回路の共振電圧を測定する計測部と、
    　前記測定された入力電流及び共振電圧に基づいて、前記トッププレート上に前記鍋があるか否かを判別する鍋無し検知部とをさらに備え、
    　前記制御部は、前記鍋無し検知部により、前記トッププレート上に前記鍋が無いと判別された場合、前記積算電力測定部を、前記積算電力を初期化するように制御することを特徴とする請求項１から５のうちのいずれか１つに記載の誘導加熱調理器。     A measuring unit for measuring an input current input to the inverter circuit and a resonance voltage of the inverter circuit;
    A panless detector for determining whether or not the pan is on the top plate based on the measured input current and resonance voltage;
    The control unit controls the integrated power measurement unit to initialize the integrated power when the panless detection unit determines that the pan is not on the top plate. The induction heating cooker according to any one of claims 1 to 5.
  7. 　前記鍋無し検知部は、前記測定された入力電流とあらかじめ設定された第２の電流値との差、及び前記測定された共振電圧とあらかじめ設定された第２の電圧値との差に基づいて、前記トッププレート上に前記鍋があるか否かを判別することを特徴とする請求項６記載の誘導加熱調理器。 The panless detector is based on a difference between the measured input current and a preset second current value, and a difference between the measured resonance voltage and a preset second voltage value. The induction heating cooker according to claim 6, wherein it is determined whether or not the pan is on the top plate.
  8. 　前記しきい値積算電力は、前記誘導加熱調理器による調理内容が炒め物であるときに前記鍋の底に調理物が焦げ付く前の所定の積算電力に設定され、
    　前記第２出力電圧は、前記調理内容が煮物である場合に、前記積算電力が前記しきい値積算電力になったときの前記出力電圧より高く、かつ、前記調理内容が炒め物である場合に、前記積算電力が前記しきい値積算電力になったときの前記出力電圧より低い出力電圧に設定されたことを特徴とする請求項１から７のうちのいずれか１つに記載の誘導加熱調理器。     The threshold integrated power is set to a predetermined integrated power before the cooked product burns to the bottom of the pan when the cooking content by the induction heating cooker is fried food,
    When the cooking content is boiled food, the second output voltage is higher than the output voltage when the integrated power becomes the threshold integrated power, and when the cooking content is fried food. The induction heating cooking according to any one of claims 1 to 7, wherein the integrated power is set to an output voltage lower than the output voltage when the integrated power becomes the threshold integrated power. vessel.
PCT/JP2011/003232 2010-06-10 2011-06-08 Induction cooker WO2011155193A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012519252A JPWO2011155193A1 (en) 2010-06-10 2011-06-08 Induction heating cooker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-132674 2010-06-10
JP2010132674 2010-06-10

Publications (1)

Publication Number Publication Date
WO2011155193A1 true WO2011155193A1 (en) 2011-12-15

Family

ID=45097808

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/003232 WO2011155193A1 (en) 2010-06-10 2011-06-08 Induction cooker

Country Status (2)

Country Link
JP (1) JPWO2011155193A1 (en)
WO (1) WO2011155193A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107860038A (en) * 2017-10-11 2018-03-30 江西摩力斯厨房设备工程有限公司 A kind of high-efficiency, energy-conserving and electromagnetical stove

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003004237A (en) * 2001-06-20 2003-01-08 Rinnai Corp Heating and cooking device
JP2004063199A (en) * 2002-07-26 2004-02-26 Tiger Vacuum Bottle Co Ltd Electromagnetic induction heating cooking method and induction heating cooker using this
JP2007115515A (en) * 2005-10-20 2007-05-10 Matsushita Electric Ind Co Ltd Induction heating cooking device
JP2008041471A (en) * 2006-08-08 2008-02-21 Matsushita Electric Ind Co Ltd Induction heating device
JP2009218140A (en) * 2008-03-12 2009-09-24 Panasonic Corp Induction heating cooking appliance
JP2009295456A (en) * 2008-06-06 2009-12-17 Hitachi Appliances Inc Induction cooker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003004237A (en) * 2001-06-20 2003-01-08 Rinnai Corp Heating and cooking device
JP2004063199A (en) * 2002-07-26 2004-02-26 Tiger Vacuum Bottle Co Ltd Electromagnetic induction heating cooking method and induction heating cooker using this
JP2007115515A (en) * 2005-10-20 2007-05-10 Matsushita Electric Ind Co Ltd Induction heating cooking device
JP2008041471A (en) * 2006-08-08 2008-02-21 Matsushita Electric Ind Co Ltd Induction heating device
JP2009218140A (en) * 2008-03-12 2009-09-24 Panasonic Corp Induction heating cooking appliance
JP2009295456A (en) * 2008-06-06 2009-12-17 Hitachi Appliances Inc Induction cooker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107860038A (en) * 2017-10-11 2018-03-30 江西摩力斯厨房设备工程有限公司 A kind of high-efficiency, energy-conserving and electromagnetical stove
CN107860038B (en) * 2017-10-11 2024-04-19 江西省大庾烘焙设备有限公司 High-efficiency energy-saving electromagnetic oven

Also Published As

Publication number Publication date
JPWO2011155193A1 (en) 2013-08-01

Similar Documents

Publication Publication Date Title
JP5641488B2 (en) Induction heating cooker
JP5454576B2 (en) Induction heating cooker
JP5827222B2 (en) Induction heating cooker
JP2007287465A (en) Induction heating device
US20130161317A1 (en) Induction heating cooker and control method thereof
JP2009059605A (en) Induction heating cooker
WO2011155193A1 (en) Induction cooker
JP2011071004A (en) Induction heating cooker
JP5218286B2 (en) Induction heating cooker
JP2011108430A (en) Induction heating cooker
WO2011155200A1 (en) Induction cooking device
JP4973568B2 (en) Induction heating cooker
JP5592410B2 (en) Induction heating cooker and control method thereof
JP5884024B2 (en) Induction heating cooker
JP2010146933A (en) Induction heating cooker
JP2010218863A (en) Induction heating cooker
JP2014229425A (en) Induction heating cooker
JP5690996B2 (en) Induction heating cooker
JP2006228541A (en) Induction heating device
JP2010262774A (en) Induction cooking device
WO2011155195A1 (en) Induction heating cooker
JP2007018788A (en) Induction heating device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11792152

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2012519252

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11792152

Country of ref document: EP

Kind code of ref document: A1