WO2017022516A1 - 誘導加熱調理器及びその制御方法 - Google Patents

誘導加熱調理器及びその制御方法 Download PDF

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Publication number
WO2017022516A1
WO2017022516A1 PCT/JP2016/071527 JP2016071527W WO2017022516A1 WO 2017022516 A1 WO2017022516 A1 WO 2017022516A1 JP 2016071527 W JP2016071527 W JP 2016071527W WO 2017022516 A1 WO2017022516 A1 WO 2017022516A1
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WIPO (PCT)
Prior art keywords
load
operation mode
induction heating
coil
unit
Prior art date
Application number
PCT/JP2016/071527
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
みゆき 竹下
孝佳 永井
松本　貞行
文屋　潤
木下　広一
和裕 亀岡
Original Assignee
三菱電機株式会社
三菱電機ホーム機器株式会社
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.)
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Publication date
Application filed by 三菱電機株式会社, 三菱電機ホーム機器株式会社 filed Critical 三菱電機株式会社
Priority to EP16832795.5A priority Critical patent/EP3331321B1/de
Priority to JP2016573627A priority patent/JP6173623B2/ja
Priority to ES16832795T priority patent/ES2883583T3/es
Priority to CN201680032720.3A priority patent/CN107852784B/zh
Publication of WO2017022516A1 publication Critical patent/WO2017022516A1/ja

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    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction heating cooker that performs induction heating of an object to be heated, such as a pan, and a control method thereof, and in particular, an induction heating cooker body using a high-frequency magnetic field from the induction heating cooker body
  • the present invention relates to an induction heating cooker with a non-contact power feeding function, which performs so-called non-contact power feeding by feeding power to a power receiving device placed thereon by magnetic field coupling, and a control method thereof.
  • the induction heating cooker supplies a high-frequency current of 20 kHz to 100 kHz to the coil, and links the magnetic flux generated by the coil to a metal heated object such as a pan or a frying pan to inductively heat the heated object.
  • a metal heated object such as a pan or a frying pan to inductively heat the heated object.
  • Device Since the principle of induction heating is electromagnetic induction, electric power can be supplied to the power receiving device by electromagnetic induction by disposing a power receiving device including a power receiving coil instead of an object to be heated. In this way, using magnetic flux, that is, a magnetic field, to supply (supply) power to a power receiving device that is a load wirelessly without using a power cord or the like is referred to as magnetic field-coupled non-contact power supply and is simply non-contact Sometimes called power feeding.
  • non-contact does not state whether the devices are in contact with each other.
  • “non-contact” refers to a state in which the devices are not electrically and physically coupled (directly connected), but the devices are simply in contact with each other, that is, covered on the device. Also includes a state where a device such as a heated object or a power receiving device is placed. Note that the name of the non-contact power feeding described here indicates a magnetic field coupling type non-contact power feeding that does not distinguish between an electromagnetic induction type, a magnetic field resonance type, a magnetic field resonance type, and the like unless otherwise specified.
  • a conventional non-contact power feeding device described in Patent Document 1 includes a top plate on which a load is placed, a primary coil that is disposed below the top plate and generates a high-frequency current, an inverter that supplies high-frequency power to the primary coil, A control unit that controls the inverter and a load determination unit that determines whether the load is an object to be heated or a power receiving device are configured to control the inverter according to the load determination result.
  • the power supplied to the primary coil is configured to be lower than when it is determined as an object to be heated.
  • the display part which displays the function of the operation part which controls the energization amount to a primary coil is provided, and it is comprised so that operation according to the kind of load may be displayed on a display part.
  • the load determination unit determines that the load is a power receiving device
  • the load determination reference level is set lower than when it is determined that the load is a heated object. For example, if the load is a pan, the control unit can output the maximum output to the primary coil and maximize the output adjustment range to the primary coil in the operation unit.
  • the control unit determines that the secondary coil of the power receiving device has the maximum power that can receive 100 W. Controls the amount of current flowing through.
  • the operation range of the operation is limited, and the display on the display unit is changed according to the operation content. In this way, the amount of energization of the primary coil is limited according to the power consumption of the load, and the operation range and display contents are changed accordingly, providing a user-friendly non-contact power feeding device It is.
  • a conventional non-contact power receiving device described in Patent Document 2 includes a power receiving coil that outputs power upon receiving a high-frequency magnetic field from an induction heating device, a load device that is supplied with power from the power receiving coil, a power receiving coil, and a load device.
  • a switching unit that opens and closes the connection and a control unit that controls the switching unit, and the control unit on the power reception device side controls the switching time of the switching unit to adjust the power supplied from the power reception coil to the load device In addition, it is configured to control the opening / closing operation.
  • the open time in the opening / closing operation of the power receiving device is set so that the induction heating device, which is the power feeding device, determines that there is no load, and the heating is not stopped, and control of the received power by controlling the non-contact power receiving device side It can be performed. Therefore, a general-purpose induction heating device can be used as the power supply device, and a non-contact power reception device that is easy to use with few restrictions on the power supply equipment can be realized.
  • the conventional cordless device described in Patent Document 3 includes a magnetic generation unit and a load unit, and the magnetic generation unit generates a top plate for placing the load unit and a high-frequency magnetic field provided under the top plate.
  • the inverter has a load circuit to which power is supplied from the secondary coil, and the inverter is primary when the receiving means receives a predetermined signal from the transmitting means and when the pan detecting means detects that there is a load on the top plate. Supply high-frequency current to the coil.
  • the pan detection means determines that the load on the top plate of the magnetism generating unit is not a pan in accordance with the judgment criteria, the load side secondary coil is not supplied with high frequency magnetism at the time of start of use.
  • the transmission means on the side is not operating. Therefore, when the pan detection means generates a high-frequency magnetic field for pot detection, the secondary coil is magnetically coupled, and when the load circuit operates, the transmission means operates to generate radio waves.
  • the generated radio wave is received by the receiving means, and upon detecting that a load is placed, the primary coil supplies a high-frequency current.
  • a load placed on the top plate such as a coffee grinder, operates.
  • the load is opened and closed by a switch provided in the coffee grinder, and a motor for rotating a blade for cutting coffee beans into an appropriate size is turned on and off.
  • the detection means determines that there is a pan in accordance with the determination criteria
  • the high-frequency current is continuously supplied and the pan is induction-heated. That is, the inverter operates to supply a high-frequency current to the primary coil when the receiving unit receives a predetermined signal from the transmitting unit of the load device and when the pan detecting unit detects that there is a pan. .
  • the conventional electromagnetic cooker described in Patent Document 4 includes a heating coil, a power feeding coil disposed on the outer periphery of the heating coil, an adapter that can be detachably mounted on the top plate and covers the periphery of the pan, and a heating coil or A power supply circuit that supplies power to the power supply coil; a relay that alternately connects the heating coil and the power supply coil to the power supply circuit; and a control unit that controls the relay.
  • the adapter includes a power receiving coil disposed so as to face the power feeding coil, and an auxiliary coil that is connected to the power receiving coil and induction-heats the side surface of the pan.
  • the control unit stops the alternate switching of the relays and selectively connects to the heating coil to supply the power. Whether or not an adapter for induction heating of the side surface of the pan is placed is determined based on whether or not power is consumed by the feeding coil. When determining that the adapter is not placed, the control unit instructs the relay to switch to heating only the heating coil.
  • the operation of the inverter is stopped, but then the relay is switched to the feeding coil side by the relay, and the feeding coil and the outer coil are energized.
  • the heating operation is performed by switching to the inner heating coil.
  • the non-contact power receiving device described in Patent Document 5 relates to a power receiving device that is used by being placed on an induction heating cooker, and a power receiving coil that receives power using a high-frequency magnetic field from the induction heating cooker;
  • a load device that is operated by a power receiving coil and a control unit that supplies power to the load device and controls the load device, and detects an electric current and a voltage supplied to the load device by an overload detection means, and is equal to or greater than a first predetermined value.
  • Safety control means for controlling so as to reduce the amount of received power when it becomes, and for controlling to stop the power supply to the load device when it exceeds the second predetermined value
  • the non-contact power receiving device provided with the is described.
  • the received power it is possible to reduce the amount of received power by switching the number of turns of the power receiving coil and reducing the number of turns.
  • the number of turns can be changed manually. Further, when the energization of the load device is stopped, the circuit of the power receiving coil is an open circuit.
  • the conventional induction heating cooker with a non-contact power feeding function determines whether the load on the top plate is an object to be heated that is induction-heated or a power receiving device that is non-contact powered and receives power. If the device is determined to be a device, the inverter is controlled to reduce the output power to the inverter, so that it is possible to supply appropriate power to a power receiving device that requires less power than the object to be heated. it can. Further, the power receiving device can supply the high frequency power received by the power receiving coil to the power consuming unit (load unit) of the power receiving device such as a DC motor.
  • Patent Document 1 it is configured as described above, has a function as an induction heating device and a function as a power supply device to a power receiving device, and operates appropriately with power according to the type of load. Therefore, it is possible to prevent a device that requires less power from operating with high power by mistake. Furthermore, the user does not need to change the setting greatly according to the type of load. However, since the setting range, setting method, and the like change according to the type of load, there is a problem that the operation becomes complicated. In addition, since the power supply control is performed on the power receiving side, it cannot respond to power on / off and power control from the power transmission side. There is a possibility that the power supply cannot be handled. In this case, the power supply to the load device is stopped.
  • Patent Document 2 since power supply control is performed on the power receiving side, it cannot cope with power on / off and power control from the power transmission side. Furthermore, since it is necessary to send and receive information by communication between the induction heating cooker that is a power feeding device and the power receiving device, there is a problem that dedicated devices are targeted and cannot be used for power receiving devices that do not support communication. is there.
  • Patent Document 3 there is no description other than turning on and off the means for controlling the power to be supplied even if the load is judged, and the rotation speed cannot be adjusted.
  • the power receiving apparatus of the characteristic similar to a pan is mounted, there exists a problem of performing an induction heating operation
  • it is necessary to send and receive information by communication between the induction heating cooker that is a power feeding device and the power receiving device there is a problem that dedicated devices are targeted and cannot be used for power receiving devices that do not support communication. is there.
  • Patent Document 4 when power is supplied to the adapter, it is necessary to alternately switch the heating coil and the feeding coil that heat the pan, so that while the power is supplied to the adapter, the pan bottom is heated. There is a problem that no electric power is supplied to the inner coil of the coil and a separate switching circuit is required.
  • Patent Document 5 when the amount of received power is reduced when the first predetermined value or more is reached, there is a problem that the user needs to manually switch and depends on the operation of the user. In addition, since power reduction control and power reception stop control are performed on the power receiving device side, there is a problem that the high-frequency magnetic field itself supplied from the induction heating cooker side cannot be controlled.
  • an object of the present invention is to obtain an induction heating cooker that can efficiently supply an appropriate amount of electric power and a control method thereof.
  • an induction heating cooker includes an electromagnetic coil for generating a magnetic field, a drive unit that supplies a high-frequency current to the electromagnetic coil, and a control unit that controls the drive unit.
  • a detecting unit that detects an electric characteristic of the drive unit, and detects a load characteristic of a load disposed in the vicinity of the electromagnetic coil based on the electric characteristic
  • the control unit includes the load Load determining means for determining whether the load is a heated object or a power receiving object according to characteristics, and when it is determined that the load is the heated object, the output power of the drive unit
  • a range of values is set to a first range having a first maximum output power value and is operated in an induction heating operation mode in which the object to be heated is heated by the electromagnetic coil, and the load is the power receiving object. If determined Sets the range of the output power value of the drive unit to a second range having a second maximum output power value, and operates in a non-contact power supply operation mode in which power is supplied to the power
  • the control method of the induction heating cooker detects the load characteristic of the load disposed in the vicinity of the electromagnetic coil, based on the electric characteristic of the drive unit that drives the electromagnetic coil for generating the magnetic field,
  • the output power value range of the drive unit is set to a first range having a first maximum output power value, and the heated coil is used by the electromagnetic coil.
  • the output power value range of the drive unit is a second maximum output power value. It is set to be in a range and controlled to operate in a non-contact power supply operation mode in which the electromagnetic coil supplies power to the power receiving object.
  • the induction heating cooker depending on whether the target load is a heated object to be heated by electromagnetic induction or a power reception target to be fed by electromagnetic induction, the load depends on the target load. Thus, it is possible to obtain an induction heating cooker that can efficiently supply an appropriate amount of electric power. Moreover, according to the control method of the induction heating cooking appliance which concerns on this invention, also when carrying out induction heating of a to-be-heated object, and supplying electric power to a receiving object by electromagnetic induction, it is suitable according to the load made into object. The control method of the induction heating cooking appliance which can supply an electric energy efficiently can be obtained.
  • FIG. 1 is an overall perspective view schematically showing an induction heating cooker according to Embodiment 1.
  • FIG. 3 is a plan view showing an example of the shape of an electromagnetic coil in the first embodiment. It is sectional drawing and the block diagram of the principal part of the electromagnetic coil which cut
  • FIG. 3 is a timing chart of control signals in the induction heating operation mode in the first embodiment.
  • FIG. 3 is a circuit diagram illustrating details of a drive unit in the first embodiment. 3 is a circuit diagram illustrating a configuration of an electromagnetic coil and a driving unit in an induction heating operation mode in Embodiment 1.
  • FIG. 3 is a circuit diagram illustrating a configuration of an electromagnetic coil and a drive unit in a non-contact power feeding operation mode in Embodiment 1.
  • FIG. 3 is a circuit diagram showing an equivalent circuit of an induction heating operation mode and a non-contact power supply operation mode in Embodiment 1.
  • FIG. 3 is a cross-sectional view of an electromagnetic coil and a block diagram of a main part in a non-contact power supply operation mode in Embodiment 1.
  • FIG. FIG. 3 is a diagram showing frequency characteristics of load resistance with respect to the type of load in the first embodiment.
  • FIG. 3 is a circuit diagram illustrating details of a drive unit in a non-contact power supply operation mode in Embodiment 1.
  • FIG. 3 is a timing chart of control signals in the non-contact power feeding operation mode in the first embodiment.
  • 10 is a flowchart illustrating a load detection processing procedure according to the second embodiment.
  • FIG. 10 is a circuit diagram showing a resonance circuit including a drive unit in Embodiment 3, and a diagram showing a relationship between a frequency and a high-frequency current.
  • FIG. 10 is a circuit diagram illustrating a configuration of an electromagnetic coil and a drive unit for explaining switching of a resonant capacitor in a non-contact power supply operation mode in a fourth embodiment.
  • FIG. 10 is a circuit diagram showing a configuration of an electromagnetic coil and a drive unit in an induction heating operation mode in Embodiment 5 and a timing chart of control signals.
  • FIG. 10 is a circuit diagram illustrating a configuration of an electromagnetic coil and a drive unit in a non-contact power supply operation mode in a fifth embodiment.
  • FIG. 20 is a diagram illustrating a configuration example of an operation unit according to a sixth embodiment.
  • 18 is a graph showing a relationship between an adjustment value and an output power value in Example 2 of Embodiment 7. It is a figure which shows the output electric power value setting table showing the relationship between the adjustment value and output electric power in the other implementation of Example 2 of Embodiment 7.
  • FIG. It is a graph showing the relationship between the adjustment value and output electric power value in the other implementation of Example 2 of Embodiment 7.
  • 18 is a graph showing a relationship between an adjustment value and an output power value in Example 3 of Embodiment 7.
  • FIG. 1 is an overall perspective view schematically showing an induction heating cooker.
  • an induction heating cooker 1 is roughly an induction heating cooker main body 2 having a casing mainly composed of sheet metal, a top plate 3 formed of a glass material covering almost the entire upper surface thereof, and the like.
  • Heating units 9 and 10 arranged on the left and right, another heating unit 11 arranged on the rear side, and cooking grill 4 are provided.
  • the heating units 9 and 10 are induction heating units (IH heating units) in which a high-frequency magnetic field (magnetic field) generating coil 100 (hereinafter referred to as an electromagnetic coil) (see FIG.
  • the other heating unit 11 may be a heating source using a radiant heater or an IH heating unit using an electromagnetic coil instead of the radiant heater.
  • the electromagnetic coil 100 is a coil using a material suitable for induction heating, such as copper.
  • the IH heating unit is illustrated and described by taking the heating unit 10 shown on the left side of FIG. 1 as an example. However, when the other heating unit 9 and the rear heating unit 11 are IH heating units. In addition, these configurations may be adopted.
  • the number of heating units is three, but the number and arrangement of the heating units are not limited to this, and the heating unit may be one or two ports. It may be more than the three ports shown in FIG. Further, the heating unit may be arranged in a horizontal row or an inverted triangle.
  • the cooking grill 4 is exemplarily described with respect to the induction heating cooker 1 having a so-called center grille structure, which is disposed in the approximate center of the casing 2, but is not limited thereto.
  • the present invention can be similarly applied to an induction heating cooker in which the cooking grill 4 is biased to one of the side surfaces or the cooking grill 4 is not provided.
  • the induction heating cooker 1 adjusts the operation unit 5 provided on the upper surface used for operating each of the heating units 9, 10, 11 and the cooking grill 4, and the output (thermal power).
  • a display unit 7 such as a liquid crystal having display units 7a, 7b, and 7c for displaying the control states, operation guides, and the like is provided.
  • the operation unit 5 may include a display unit including a display device such as an LED indicating the set output level.
  • the operation unit 5 and the display unit 7 are not limited to the configuration, number, and arrangement shown in FIG. 1, and an optimal configuration can be selected according to convenience and device specifications.
  • the induction heating cooker 1 has intake / exhaust windows 8 a, 8 b, 8 c provided on the back side on the top plate 3.
  • the induction heating cooker 1 has a built-in drive unit 40 that supplies a high-frequency current to the heating units 9 and 10.
  • the induction heating cooking appliance 1 is not limited to arrangement
  • the electromagnetic coil 100 is an induction heating coil when a load placed near the electromagnetic coil 100 via the top plate 3 is an object to be heated. When it operates and the load is a power receiving device, it operates as a feeding coil.
  • FIG. 2 is a plan view showing the configuration of the electromagnetic coil 100 disposed below the heating unit 10 on the top plate 3.
  • the electromagnetic coil 100 is configured by concentrically arranging a plurality of coils formed of so-called windings formed by winding a linear conductor.
  • the 2 (a) is composed of a plurality of coils (hereinafter referred to as individual coils) 101 to 104 each composed of an inner coil group and an outer coil group and wound individually.
  • the individual coil 101 and the individual coil 102 are an inner coil group (hereinafter referred to as a central coil), and the individual coil 103 and the individual coil 104 are an outer coil group (hereinafter referred to as a peripheral coil).
  • the individual coil 101 and the individual coil 102 constituting the central coil, and the individual coil 103 and the individual coil 104 constituting the peripheral coil may be connected in series or may be independent coils.
  • the individual coils 101 to 104 constituting the electromagnetic coil 100 have a circular shape and are arranged concentrically with each other.
  • the shape of the electromagnetic coil 100 is limited to this.
  • it may be composed of six individual coils 101, 102, 103, 104, 105, 106, and a plurality of individual coils 103 to 106 as peripheral coils.
  • the coil may be a small-diameter coil that is divided into two and is arranged so as to surround the periphery of the central coil.
  • the form of the coils disposed in the heating units 9 and 10 and the heating unit 11 is not limited to the number of the individual coils constituting the electromagnetic coil 100 shown in FIGS.
  • a coil having a configuration shown in 2 (c) to (d) may be used.
  • the electromagnetic coil 100 in FIG. 2A is shown as an example in which the individual coil 101 and the individual coil 102 constitute a central coil, and the individual coil 103 and the individual coil 104 constitute a peripheral coil, but these combinations are limited to FIG.
  • the individual coils 101 to 104 may all be independent coils, or may be coils connected in series with any of the individual coils 101 to 104, as long as they are composed of a central coil and peripheral coils.
  • a plurality of coil combinations in the coils shown in FIGS. 2B, 2C, and 2D configured by a plurality of coils can be arbitrarily set.
  • the coil which consists of a combination of a center coil and a peripheral coil is mainly demonstrated.
  • the electromagnetic coil 100 is generally configured to obtain an output power of 1,500 W at the central coil and 1,500 W at the peripheral coils.
  • the electromagnetic coil 100 is a coil composed of a plurality of coils composed of a central coil composed of the individual coils 101 and 102 and a peripheral coil composed of the individual coils 103 and 104.
  • the number of coils constituting the central coil and the peripheral coil is not limited to that shown in FIG.
  • the outer shape of the individual coil 102 constituting the central coil shown in FIGS. 2A to 2C is preferably a size suitable for heating a so-called small pan up to about 14 cm.
  • the outer shape of the individual coil 103 constituting the peripheral coil shown in 2 (a) is preferably a size suitable for heating a pan of about 20 cm with a medium-sized pan larger than a small pan, The size is about the same as the individual coil 103 in FIG. 2C and the individual coil 102 in FIG.
  • the size is suitable for heating.
  • FIG. 3 is a cross-sectional view of the surface S of the electromagnetic coil 100 disposed below the heating unit 10 on the top plate 3 shown in FIG. 1 and a block diagram showing the configuration of each part connected thereto. 3 will be described using the form of the electromagnetic coil 100 shown in FIG.
  • the electromagnetic coil 100 is composed of a plurality of individual coils 101 to 104.
  • the central coil 101 is connected in series with the individual coil 102 with a gap of about 20 mm for attaching the temperature sensor, and is independent of the individual coil 102.
  • the individual coil 103 is provided with a gap of about 10 mm, and the individual coil 104 is connected in series with a gap of about 15 mm outside the individual coil 103.
  • the individual coil 103 and the individual coil 104 are individually connected.
  • An outer coil is disposed around the coil 102.
  • the upper surface of the electromagnetic coil 100 and the top plate 3 are arranged with a gap Gap1 of about 3 mm. Note that the numerical values such as the gap dimensions shown here do not limit
  • the drive unit 40 includes a drive circuit 40a that drives a central coil in which the individual coil 101 and the individual coil 102 are connected in series, and a drive circuit 40b that drives a peripheral coil in which the individual coil 103 and the individual coil 104 are connected in series.
  • a detection unit 60 is connected to the drive unit 40.
  • the detection unit 60 includes a plurality of detection circuits 60a and 60b connected independently for each of the plurality of drive units, and the presence or absence of a load on the top plate 3 depending on the electrical characteristics detected by the detection circuits 60a and 60b,
  • the load characteristic of the load of the heating unit 10 for determining the shape, size, material, and the like of the load placed on the electromagnetic coil 100 via the top plate 3 is detected.
  • the electrical characteristics of the heating unit 10 include, for example, the electrical characteristics of the drive unit 40 itself that changes when a load is placed on the electromagnetic coil 100 via the top plate 3, and electromagnetics connected to the drive unit 40.
  • the electrical characteristics of the coil 100 and the resonant capacitor 80 are shown. Typical examples of the electrical characteristics herein include those obtained by converting voltage, current, frequency, resistance value, or temperature information into electrical signals.
  • the control unit 50 is illustrated here based on the detection results of the load characteristics of the individual coils 101 and 102 as the central coil and the individual coils 103 and 104 as the peripheral coils detected by the detection unit 60.
  • the load is discriminated by the load discriminating means, and the drive unit 40 is controlled so as to operate under conditions suitable for the load placed on the top plate 3.
  • the load characteristic referred to here is a characteristic characteristic of the load that can determine the type of the load, such as a frequency characteristic of the load resistance obtained from the electric characteristic of the load.
  • control unit 50 selects a driving frequency suitable for the material of the load in order to obtain load characteristics of the load, or via the operation unit 5 or the operation unit 6 provided in the induction heating cooker body 2.
  • the drive condition of the drive unit 40 is changed so that a high-frequency current having a magnitude corresponding to the operated content (set value) is supplied to the electromagnetic coil 100, or the display content of the display unit 7 is changed.
  • the control unit 50 drives the drive unit 40 when the load determination unit determines that no load exists on the top plate 3 based on the detection result of the load characteristic of the heating unit 10 by the detection unit 60. Is stopped, and a notification that the load is not placed is displayed via the display unit 7.
  • a means for notifying although not shown here, for example, display on the display unit 7 or sound means such as a buzzer may be used.
  • the control unit 50 places the pan P on the basis of the load characteristics of the load detected by the detection unit 60.
  • the drive unit 40 is controlled so as to stop the supply of the high-frequency current to the electromagnetic coil 100 determined to have a small area. That is, unnecessary power consumption is suppressed and induction heating is efficiently performed by individually controlling each drive circuit of the drive unit 40 so as to drive only the coil on which the pan P is placed among the plurality of coils. Perform the action.
  • the operation states of the operation units 5 and 6 and the setting of display contents on the display unit 7 may be performed by a microcomputer provided separately from the control unit 50.
  • the heating part 10 is mainly described here, the same contents can be applied to the other heating parts 9 and 11.
  • the coil shape is also typically described with reference to FIG. 2A, but the same effect can be obtained with FIG. 2B and FIG. 2C configured with a plurality of coils.
  • FIG. 4 is a circuit diagram showing a more detailed configuration of the drive unit 40, the control unit 50, the detection unit 60, and the electromagnetic coil 100 shown in FIG.
  • FIG. 4 is a circuit diagram including an example of a drive unit 40 that generates a high-frequency magnetic field.
  • the power supply unit 30 shown in FIG. 4 rectifies AC power supplied from a commercial power supply 31 with a diode bridge 32, and choke coil 331. Is converted to direct current by a smoothing circuit 33 including a smoothing capacitor 332, and power is supplied to the drive unit 40.
  • the drive unit 40 supplies a high-frequency current to the electromagnetic coil 100 based on a command from the control unit 50.
  • the control part 50 will heat the pan P with the set output (thermal power). Therefore, the drive unit 40 is controlled so as to supply the high frequency current corresponding to the set output to the electromagnetic coil 100 by controlling the drive frequency and the magnitude of the high frequency current.
  • the drive unit 40 includes a drive circuit 40a that supplies a high frequency current to the individual coil 101 and the individual coil 102 that form a central coil, and a drive circuit 40b that supplies a high frequency current to the individual coils 103 and 104 that form a peripheral coil.
  • the drive circuit 40a includes a semiconductor switching element pair 401 (hereinafter referred to as an arm 401) in which two semiconductor switching elements 401a and 401b are connected in series, and a semiconductor in which two semiconductor switching elements 402a and 402b are connected in series.
  • It includes a switching element pair 402 (hereinafter referred to as an arm 402), and is configured by a full bridge circuit in which central coils 101 and 102 and a resonant capacitor 81 are connected in series between the midpoints of the arm 401 and the arm 402. Yes.
  • a switching element pair 402 hereinafter referred to as an arm 402
  • the drive circuit 40b includes a semiconductor switching element pair 401 (hereinafter referred to as an arm 401) in which two semiconductor switching elements 401a and 401b are connected in series, and two semiconductor switching elements 403a and 403b connected in series.
  • the semiconductor switching element pair 403 (hereinafter referred to as the arm 403) is configured by a full bridge circuit in which the peripheral coils 103 and 104 and the resonance capacitor 83 are connected in series between the midpoints of the arms 401 and 403. Has been.
  • Each of the drive circuit 40a and the drive circuit 40b has detection circuits 60a and 60b that detect electrical characteristics of the loads of the drive circuit 40a and the drive circuit 40b.
  • the detection circuits 60a and 60b are connected to the detection unit 60. Yes.
  • the detection unit 60 detects, for example, a load characteristic that is a frequency characteristic of the load resistance, based on the electrical characteristics of the load.
  • the control unit 50 determines the state on the top plate 3 based on the load characteristics detected by the detection unit 60, for example, the presence / absence of the load, the material, or the state of displacement.
  • the electrical characteristics of the load of the drive unit 40 detected by the detection circuits 60a and 60b of the detection unit 60 are applied to, for example, the current flowing through the power supply unit 30, the current flowing through the individual coils 101 to 104, and the resonant capacitors 81 and 83. And the output voltage of the drive unit 40.
  • the means for detecting the state of the load placed on the top plate 3 may be a temperature sensor or an optical sensor.
  • the inductance of the central coil composed of the individual coil 101 and the individual coil 102 is La, and the capacitor capacity of the resonance capacitor 81 connected in series with this is Ca, the series resonance composed of the inductance La and the capacitor capacity Ca.
  • the resonance frequency f0a of the load is obtained by Expression (1).
  • the inductance of the peripheral coil composed of the individual coil 103 and the individual coil 104 is Lb, and the capacitor capacity of the resonance capacitor 83 connected in series with this is Cb
  • the series resonant load composed of Lb and Cb The resonance frequency f0b is obtained by Expression (2).
  • the drive frequency fswa for driving the full bridge circuit (drive circuit 40a) composed of the arm 401, the arm 402, the individual coils 101 and 102, and the resonance capacitor 81 is obtained from the inductance La and the capacitor capacitance Ca described above. It is desirable that the frequency be higher than the resonance frequency f0a.
  • the drive frequency fswb for driving the full bridge circuit (drive circuit 40b) composed of the arm 401, the arm 403, the individual coils 103 and 104, and the resonance capacitor 83 is obtained from the inductance Lb and the capacitor capacitance Cb described above. It is desirable that the frequency be higher than the resonance frequency f0b. This is to prevent the loss of each switching element of the drive unit 40 from increasing and damaging. Note that a snubber capacitor may be appropriately connected in parallel to each semiconductor switching element constituting each arm so as to reduce noise during switching.
  • the respective inductances of the central coil composed of the individual coil 101 and the individual coil 102 and the peripheral coil composed of the individual coil 103 and the individual coil 104 are in a so-called no-load state in which no load is placed on the top plate. It is desirable that the resonance frequency f0a and the resonance frequency f0b are approximately 20 kHz, and that the difference ⁇ f0 between the resonance frequency f0a and the resonance frequency f0b is smaller than 3 kHz.
  • the resonance frequency f0a and the resonance frequency f0b are selected to be close to each other when the drive circuit 40a and the drive circuit 40b are driven at the same frequency fswc, the difference between the drive frequency fswc and the resonance frequency f0a, the drive frequency fswc, and the resonance frequency.
  • the difference from f0b the magnitude of the high-frequency current flowing through the coil with the larger frequency difference is reduced, resulting in nonuniform heating distribution due to the difference in current between the central coil and the peripheral coil. This is to suppress this.
  • FIG. 5 shows a timing chart of the control signals S1 to S6 for driving the semiconductor switching element pairs 401 to 403. These control signals S1 to S6 are output from the control unit 50.
  • the semiconductor switching elements 401a and 401b constituting the semiconductor switching element pair 401 are connected to signal circuits for supplying a control signal S1 and a control signal S2 from the control unit 50, respectively.
  • the control signal S2 is a pair of complementary signals whose phase relationship is fixed and each has an on / off period exclusively.
  • control signal S1 will be described as an example.
  • the semiconductor switching element 401a is turned on when it is at the H (high) level and turned off when it is at the L (low) level.
  • control signals S1 and S2 (or the control signals S3 and S4, the control signals S5 and S6), which are a set of complementary signals, are generated when the drive signal waveform is distorted or delayed, for example.
  • the semiconductor switching element pair 402, 403 there is a pause period (dead time Tda, Tdb) so that there is no period in which the semiconductor switching elements 401a and 401b connected in series vertically are simultaneously turned on (simultaneous ON). Is provided.
  • the ON period of each signal is equal to half the time excluding the dead time from the period T. That is, when the dead time is “0”, the signal is an on time (duty 50%) of 1 ⁇ 2 of the period T.
  • a signal circuit that supplies a control signal S3 and a control signal S4 from the control unit 50 is connected to the semiconductor switching element 402a and the semiconductor switching element 402b that constitute the semiconductor switching element pair 402, respectively.
  • a signal circuit that supplies control signals S5 and S6 from the control unit 50 is connected to the semiconductor switching element 403a and the semiconductor switching element 403b constituting the 403, respectively, and the control signal S3, the control signal S4, and the control signal S5 are controlled.
  • the signal S6 is a pair of complementary signals in which dead times Tda and Tdb are set, respectively, like the control signal S1 and the control signal S2.
  • the magnitude of the high-frequency current supplied to the central coil composed of the individual coil 101 and the individual coil 102 depends on the phase difference ⁇ a (0 ⁇ a ⁇ 2 ⁇ ) between the control signal S1 and the control signal S3 (control signal S2 and control signal S4). It is determined. The higher the phase difference ⁇ a, the higher the high-frequency current flowing through the central coil. On the other hand, the magnitude of the high-frequency current supplied to the peripheral coil including the individual coil 103 and the individual coil 104 is the phase difference ⁇ b (0 ⁇ b ⁇ 2 ⁇ ) between the control signal S1 and the control signal S5 (control signal S2 and control signal S6). ).
  • the control unit 50 adjusts the phase difference ⁇ a or ⁇ b so that the output set via the operation units 5 and 6 can be obtained.
  • the frequency f of the drive signals S1 to S6 is a drive frequency fsw for driving each semiconductor switching element of the drive unit 40, and is equal to the frequency of the high-frequency current supplied to the electromagnetic coil 100.
  • the drive frequency fsw at this time is determined by the control unit 50 based on the load characteristics detected by the detection unit 60.
  • the detection unit 60 detects the electrical characteristics of the drive unit 40 when a load is placed on the top plate 3, and the control unit 50 is based on the detection result of the detection unit 60 and is the optimum high-frequency current for heating the load.
  • the drive frequency fsw may be a value set in advance according to the detection result, that is, the load characteristic of the load placed on the top plate 3, and the resonance frequency f 0 is calculated from the electric characteristic detected by the detection unit 60. However, it may be determined based on this.
  • the drive frequency fsw set by the control unit 50 is determined by the electrical characteristics of the drive unit 40.
  • the inductance of each coil changes due to the coupling between the load and the individual coils 101 to 104.
  • the resonance frequency f0a of the series resonance load composed of the individual coil 101, the individual coil 102, and the resonance capacitor 81, and the individual coil 103, the individual coil 104, and the resonance capacitor 83
  • the resonance frequency f0b of the series resonance load is also changed. That is, since the resonance frequency f0a of the drive circuit 40a and the resonance frequency f0b of the drive circuit 40b in FIG. 4 vary depending on the load, the controller 50 determines the material of the pan P on the top plate 3 from the difference in electrical characteristics. Can be determined.
  • the frequency fswa of the signal for driving the full bridge circuit (drive circuit 40a) composed of the arm 401, the arm 402, the individual coils 101 and 102, and the resonance capacitor 81 is the resonance frequency obtained from La and Ca described above.
  • a frequency higher than f0a is desirable.
  • the frequency fswb of the signal for driving the full bridge circuit (drive circuit 40b) composed of the arm 401, the arm 403, the individual coils 103 and 104, and the resonance capacitor 83 is the resonance frequency obtained from Lb and Cb described above.
  • a frequency higher than f0b is desirable.
  • the control unit 50 calculates the resonance frequencies f0a and f0b of the drive circuits 40a and 40b from the detection results of the detection circuit 60a and the detection circuit 60b constituting the detection unit 60, and further, the resonance frequencies f0a and f0b are calculated.
  • the difference is smaller than a preset value
  • the frequency fc greater than f0a and greater than f0b is set as the drive frequency fsw and set to the frequency f of the control signals S1 to S6.
  • control unit 50 detects the electrical characteristics of the respective drive circuits obtained from the detection result of the detection circuit 60a that detects the electrical characteristics of the drive circuit 40a and the detection result of the detection circuit 60b that detects the electrical characteristics of the drive circuit 40b. Based on the above, a frequency fc suitable for the detected electrical characteristic may be selected from the drive frequency fsw set in advance for each electrical characteristic.
  • FIG. 6 simply shows the configuration of the drive unit 40 at this time.
  • the heating unit 10 will be described in detail as an example, but the same configuration may be applied to the heating unit 9 and the heating unit 11.
  • one end of the resonance capacitor 81 is connected to the midpoint of the series body (arm 401) of the semiconductor switching element 401 a and the semiconductor switching element 401 b, and the other end is the start of winding of the winding constituting the individual coil 101. Is connected to one end of the individual coil 101.
  • the other end of the individual coil 101 is connected to one end of the individual coil 102 where the winding starts, and the other end of the individual coil 102 is the midpoint of the series body (arm 402) of the semiconductor switching element 402a and the semiconductor switching element 402b. It is connected to the.
  • one end of the resonance capacitor 83 is connected to the midpoint of the series body (arm 401) of the semiconductor switching element 401 a and the semiconductor switching element 401 b, and the other end is the winding of the individual coil 103. It is connected to one end of the individual coil 103 at the beginning of winding. Furthermore, the other end of the individual coil 103 is connected to one end of the individual coil 104 that is the start of winding, and the other end of the individual coil 104 is the midpoint of the series body (arm 403) of the semiconductor switching element 403a and the semiconductor switching element 403b. It is connected to the.
  • black “dots” marked on the individual coils 101 to 104 represent the start of winding of the coil winding.
  • FIG. 6 black “dots” marked on the individual coils 101 to 104 represent the start of winding of the coil winding.
  • Ia is a high-frequency current flowing through the individual coils 101 and 102 and the resonance capacitor 81 connected in series with each other
  • Ib is a high-frequency current flowing through the individual coils 103 and 104 and the resonance capacitor 83 connected in series with each other. Current is shown.
  • the high-frequency current Ia flows through a full-bridge circuit (drive circuit 40 a) composed of the arm 401 and the arm 402, while the high-frequency current Ib is a full-bridge circuit (comprising the arm 401 and the arm 403 ( It flows through the drive circuit 40b).
  • both the high-frequency current Ia and the high-frequency current Ib flow through the arm 401 in common.
  • the high-frequency current flows through the arm 402 and the arm 403 simultaneously with the arm 401 as a common arm.
  • the paths through which the high-frequency currents Ia and Ib flow are shown only for the path from the semiconductor switching element 401 a to the semiconductor switching element 402 b and the path from the semiconductor switching element 401 a to the semiconductor switching element 403 b. It goes without saying that the current flows also in the path between the semiconductor switching element 401b and the semiconductor switching element 402a, and between the semiconductor switching element 401b and the semiconductor switching element 403a in the period. Further, the arrangement of connections between the resonance capacitor 81 and the individual coil 101, the individual coil 102, and the resonance capacitor 83, the individual coil 103, and the individual coil 104 is not limited to FIG.
  • FIG. 7 shows a state where a pan P that is an object to be heated is placed on the electromagnetic coil 100.
  • the individual coils 101 and 102 are connected in series with the resonance capacitor 81 and are connected to the drive unit 40.
  • the individual coils 103 and 104 are connected in series with the resonance capacitor 83 and the switch 21, and are connected to the drive unit 40.
  • the switch 21 is described for convenience in order to explain the operation of the induction heating cooker 1, and the switch 21 is not actually included in the constituent elements.
  • the control unit 50 supplies a high-frequency current to the electromagnetic coil 100 under the driving condition for detection to the driving unit 40 in order to detect the load.
  • the high frequency current flowing through the individual coils 101 and 102 is detected by the current sensor 61
  • the high frequency current flowing through the individual coils 103 and 104 is detected by the current sensor 62.
  • the current sensor 63 detects the power input current. Based on the information of each current sensor, these detection values detected by the detection unit 60 are compared with predetermined determination values set in advance, and the load placed on the top plate 3 by the load determination means is determined.
  • the drive part 40 will supply the high frequency current to the electromagnetic coil 100 as an induction heating coil based on the instruction
  • the control unit 50 when the operation unit 5 or the operation unit 6 is operated to heat the pan P and the output is adjusted to heat the pan P, the control unit 50 generates high-frequency power corresponding to the set output.
  • the drive signals S 1 to S 6 are controlled, and the drive unit 40 is controlled so as to supply a high-frequency current to the electromagnetic coil 100.
  • the electromagnetic coil 100 is operated as an induction heating coil, and the pan P is heated with a predetermined output by the high-frequency magnetic field generated by the electromagnetic coil 100.
  • the maximum output power value of one heating source (heating unit) generally required is 3 It is about 1,000W.
  • the maximum output power value when a plurality of heating sources are operated simultaneously is limited to 5,800 W or less, for example. Therefore, when the control unit 50 shifts to the induction heating operation mode, the drive conditions such as the adjustment range of the output power value and the drive frequency fsw are set so that the maximum output power value MP1 of the drive unit 40 is about 3,000 W. Is done. Note that the maximum output power value when a plurality of heating sources operate simultaneously is not limited to this.
  • the pan P placed on the top plate 3 is a pan having a diameter similar to that of the individual coil 104, for example, a large pan having a pan bottom diameter of about 240 mm, the pan P has a maximum output power value.
  • the control unit 50 controls the drive unit 40 to supply a high-frequency current to all of the individual coils 101 to 104.
  • the switch 21 forms a closed circuit.
  • all the control signals S 1 to S 6 are supplied to the drive unit 40 by the control unit 50. In this state, since the high-frequency current is supplied to all the individual coils 101 to 104, this is an equivalent state in which the switch 21 forms a closed circuit.
  • FIG. 8 is a diagram illustrating the relationship between the adjustment value and the output power value in the induction heating operation mode and the non-contact power supply operation mode.
  • the horizontal axis represents the adjustment value ⁇
  • the vertical axis represents the output power value P obtained by the electromagnetic coil 100.
  • the control unit 50 controls the drive unit 40 according to the adjustment value ⁇ , and changes the magnitude of the high-frequency current I. As a result, the output power value P increases or decreases.
  • the adjustment value ⁇ in the induction heating operation mode is the maximum ⁇ 1
  • the output power value P is the maximum MP1, and this is the first maximum output power value MP1.
  • the maximum output power value MP1 in the induction heating operation mode is generally about 3,000 W. Therefore, the control unit 50 changes the phase difference ⁇ of the drive signal S shown in FIG. 5 so that the output of the drive unit 40 can have a maximum of 3,000 W.
  • the adjustment value that provides the maximum output power value MP1 is ⁇ 1. As described above, the control unit 50 changes the adjustment value ⁇ , so that the output power can be accurately changed over a wide range from low output to high output, and good cooking performance can be obtained. Further, as shown in FIG.
  • the state of the display unit 7 for example, the lighting state of the LED indicating the adjustment value of the output power, changes according to the increase or decrease of the output power, and the LED is in the full lighting state at the maximum output power value MP ⁇ b> 1.
  • the display of the adjustment value may be a numerical value, for example, as long as it is a means capable of recognizing a change in state or a set value.
  • FIG. 9 is an explanatory diagram showing a lighting state of an LED that is an example of the display unit 7.
  • the lighting state of the LED changes according to the adjustment value ⁇ .
  • FIG. 9A shows a lighting state of the LED at the time of the maximum output by the first maximum output power value MP1 in the induction heating operation mode.
  • FIG. Represents a state.
  • FIG. 9C shows how the LED lighting state changes with respect to the adjustment value ⁇ . While the heating is stopped, all the LEDs are turned off so as to indicate that the output is “0”, and each time the adjustment value ⁇ is increased by one step, the number of LEDs increases one by one.
  • the optimal output power can be adjusted according to the cooking process.
  • the drive unit 40 outputs the first maximum output power value MP1.
  • output power over a wide range from a low output power value to a maximum output power value (about 3,000 W) can be obtained, and the setting state of the output power is further displayed on the display unit 7. Since it is possible to cook while confirming with, it is possible to obtain an easy-to-use cooker.
  • FIG. 10 is a circuit diagram showing a block configuration of the induction heating cooker in the non-contact power supply operation mode.
  • FIG. 10 has the same configuration as that of FIG. 7 except that it is a non-contact power supply operation mode in which the power receiving device A is placed as a load.
  • FIG. 11 is a circuit diagram showing an equivalent circuit in the induction heating operation mode and the non-contact power supply operation mode.
  • FIG. 12A is a diagram illustrating a configuration example of the power receiving device A, which includes a power receiving device housing 501 and a power receiving circuit AX, and includes a power receiving coil 502, a power circuit 503, a resistor, a rotating body, and the like.
  • FIG. 12B is a cross-sectional view of the heating unit 10 on the surface S of the induction heating cooker body 2 when the power receiving device A is placed on the heating unit 10 on the top plate 3, and is connected to this. It is the figure which showed the structure of each part.
  • the sectional view of the electromagnetic coil 100 in FIG. 12B is a sectional view of the form of the electromagnetic coil 100 shown in FIG.
  • the load characteristic is detected by the detection unit 60 based on the electrical characteristic of the drive unit 40, and the control unit is based on the detection result.
  • a high-frequency current is supplied to the electromagnetic coil 100 under the detection driving conditions, and the high-frequency current flowing in the individual coils 101, 102 by the current sensor 61 as the detecting means, for example.
  • a current is detected, and a high frequency current flowing through the individual coils 103 and 104 is detected by the current sensor 62.
  • the current sensor 63 detects the power input current.
  • the load characteristic detected by the detection unit 60 is compared with a predetermined determination value set in advance, and the load placed on the top plate 3 by the load determination means is
  • the drive unit 40 supplies a high frequency current to the magnetic field generating excitation circuit EX including the electromagnetic coil 100 as the power feeding coil based on the command of the control unit 50, and Power to This state is referred to as a non-contact power supply operation mode.
  • the current sensors 61 and 62 of the detection circuits 60a and 60b and the voltage sensors of the detection circuits 60a and 60b are passed through the top plate 3.
  • the electrical characteristics of the loads placed on the electromagnetic coil 100 comprising the individual coils 101 to 104 are respectively detected, and the load characteristics detected from these electrical characteristics are output from the detection unit 60 and provided in the control unit 50.
  • the control unit 50 controls the driving condition of the driving unit 40 so that the electromagnetic coil 100 operates as a power feeding coil.
  • the load discriminating means an electrical characteristic such as an output voltage or a high frequency current of the drive unit 40 is acquired, and the load characteristic obtained thereby is compared with a discrimination value set in advance.
  • a discrimination value set in advance.
  • the relationship between the impedance of the load of the driving unit 40 and the resonance frequency may be used.
  • the determination may be made by comparing the input current and the output current with a preset threshold value.
  • a means for detecting the load any known arbitrary means can be used as long as it detects electric characteristics of the object to be heated from the driving voltage V applied to both ends of the electromagnetic coil 100 and the driving current I flowing through the electromagnetic coil 100.
  • a circuit configuration similar to that of the load detection unit disclosed in Japanese Patent Application Laid-Open No. 2012-054179 is assumed.
  • a characteristic curve T for determination in the frequency characteristic of the load resistance is created based on the electrical characteristics acquired in advance for each load. As shown in FIG. 13, the determination characteristic curve T is obtained, for example, by taking the frequency f on the horizontal axis and the load resistance R on the vertical axis. The process of creating the distinguishing characteristic curve T by the frequency f and the load resistance R is obtained by calculating from the driving voltage and driving current of a circuit shown separately. The determination characteristic curve T is the basis for determination during load determination (corresponding to the setting contents of the determination value).
  • the discrimination characteristic curve T is compared, and the type of load is discriminated based on whether or not the discrimination characteristic curve T is within a certain region.
  • This characteristic curve for discrimination T is used as a threshold for load discrimination.
  • the shape of the determination characteristic curve T is exemplarily shown as a curve. However, the shape may be a linear shape or a broken line shape as long as the load can be determined.
  • an example of the load determination procedure is a method for determining whether the load placed on the top plate 3 is a power receiving object including the power receiving device A or a heated object such as a pan P. It is shown below.
  • the load resistance R and the impedance Z when the magnetic field generating excitation circuit EX including the electromagnetic coil 100 that generates the magnetic field is viewed from the drive unit 40 are mounted (coupled) to the magnetic field generated by the electromagnetic coil 100. It changes with that. Moreover, it changes also when to-be-heated objects, such as the pan P, are mounted
  • the power receiving object composed of the power receiving device A and the object to be heated such as the pan P have different change characteristics, and the power receiving device A is determined using the difference in the characteristics.
  • the power receiving device A is determined by detecting the electrical characteristics of the drive unit 40, that is, the electrical characteristics of the drive unit 40 in the magnetic field generating excitation circuit EX including the electromagnetic coil 100 that is driven by the drive unit 40 supplied with a high-frequency current. It is executed by the load determination means provided in the control unit 50 based on the result of the load characteristic detected by the unit 60 and obtained from the electrical characteristic.
  • the characteristics relating to the input current and the output current in the magnetic field generating excitation circuit EX can be used. However, these characteristics are greatly different between the case where the power receiving device A is placed and the case where an object to be heated such as the pan P is placed, which is provided in the control unit 50 based on the detection result by the detection unit 60. It is discriminated by the given load discriminating means.
  • the control unit 50 obtains electrical characteristics by the detection unit 60 while varying the frequency for driving the switching element of the drive unit 40 in an arbitrary step within a range of, for example, 10 kHz to 100 kHz.
  • the vertical axis is compared with the above-described characteristic curve T for determination of load resistance.
  • the power receiving device A is constituted by a resonance circuit having a power receiving coil and a capacitor
  • a resonance characteristic curve is drawn as shown by the characteristic curve A in FIG. 13 having a maximum resistance value.
  • the object to be heated such as the pot P has a resistance value that slowly increases as the frequency increases, and therefore a characteristic curve indicated by a characteristic curve P different from that of the power receiving device A is drawn.
  • the detection unit 60 distinguishes between the power receiving device A and the object to be heated such as the pot P, and then determines the load characteristic of the object to be heated such as the pot P and compares the material with the characteristic curve T for determination. .
  • the control unit 50 controls the drive unit 40 based on these results.
  • a discrimination characteristic curve T of a discrimination value (load judgment threshold) is set along a characteristic curve P related to an object to be heated such as a pan P, and is detected by detection circuits 60 a and 60 b of the detection unit 60.
  • the detected electrical characteristic is acquired, and a load characteristic is generated.
  • the control unit 50 determines the load as the power receiving device A that is the power receiving object when the load characteristic is included in the region above the curve T based on the determination characteristic curve T based on the load characteristic from the detection unit 60. And is to be detected.
  • moves by non-contact electric power feeding has low electric power of about several hundred W I only need it. That is, as compared with the maximum output power value MP1 (for example, 3,000 W) in the induction heating operation mode, the maximum power required by the power receiving device A may be a low output power value. Furthermore, there is a possibility that the maximum output power value MP2 that can be supplied in a non-contact manner by the power feeding device is restricted to 1,500 W due to regulations. That is, the maximum output power value MP2 supplied to the power receiving device may be about half of the maximum output power value MP1 in the induction heating operation mode at the maximum.
  • the control unit 50 opens the switch 21 illustrated in FIG. 10 so that the maximum power value output from the driving unit 40 is 1,500 W or less.
  • the circuit is controlled so that the peripheral coils (individual coils 103 and 104) are separated from the drive unit 40 and switched to only the central coils (individual coils 101 and 102).
  • FIG. 10 This switching operation will be described with reference to FIGS. 10, 11, 13, 14, and 15.
  • FIG. 10 the switch 21 is described for convenience in order to explain the operation of the induction heating cooker 1 of the present embodiment, and the switch 21 is not actually included in the constituent elements.
  • the detection drive conditions for example, the frequency of the high-frequency current and the magnitude of the current
  • a high frequency current I flowing through the individual coils 101 and 102 is detected by the current sensor 61
  • a high frequency current flowing through the individual coils 103 and 104 is detected by the current sensor 62. I is detected.
  • the current sensor 63 detects the power input current.
  • the control unit 50 continuously changes the frequency f of the high-frequency current I, it is detected by the detection unit 60 as compared with the pan P that is an object to be heated. Since a peak is seen in the resistance component, the control unit 50 uses the load characteristic detected by the detection unit 60 and a predetermined predetermined determination using the fact that the change in electrical characteristics is different from the pan load. The values are compared, and it is determined by the load determining means that the load placed on the top plate 3 is the power receiving device A (non-contact power supply operation mode).
  • the electromagnetic coil 100 serves as a power feeding (power transmission) coil
  • the coil mounted on the power receiving device A serves as the power receiving coil 502.
  • the induction heating operation mode it can be expressed by a transformer composed of an N-turn electromagnetic coil 100 and a one-turn pan constituting the magnetic field generating excitation circuit EX.
  • control unit 50 controls the magnitude of the high-frequency current I flowing through the individual coils 101 and 102 to change the high-frequency magnetic field interlinked with the power receiving coil 502, and thereby the magnitude of the high-frequency current I flowing through the power receiving coil 502. That is, the power supplied to the power receiving device A can be controlled.
  • the power supply here refers to the power supplied to the power receiving device A.
  • the magnitude of the supplied power is controlled by changing the magnitude of the high-frequency magnetic field linked to the power receiving coil 502, that is, the magnitude of the high-frequency current flowing through the electromagnetic coil 100 that is the primary coil.
  • the control unit 50 changes the adjustment value ⁇ stepwise (that is, changes the adjustment value ⁇ stepwise), for example. Simple adjustment steps such as strong, medium and weak can be realized. As described above, since power can be supplied to the power receiving device A and turned on / off by an operation on the induction heating cooker body 2, a power supply device that is easy to use can be realized.
  • the control unit 50 suppresses the maximum output power value of the drive unit 40.
  • FIG. 6 showing a detailed block diagram of the drive unit 40, the individual coils 103 and 104, which are peripheral coils, are disconnected from the drive circuit 40b and switched to only the individual coils 101, 102 which are central coils. That is, in the circuit of the induction heating cooker 1 of FIG. 10, the switch 21 is in an open circuit state.
  • FIG. 14 This is an extraction display of a part of the circuit configuration of the drive unit 40 shown in FIG.
  • the control unit 50 fixes the signal levels of the control signals S4 and S5 supplied to the drive unit 40 shown in FIG. 14 to the L (low) level. .
  • the semiconductor switching elements 403a and 403b of the arm 403 shown in FIG. 14 are not driven and the operation of the drive circuit 40b is stopped, so that no high-frequency current flows through the individual coils 103 and 104, which are peripheral coils.
  • the high-frequency current Ia is supplied only to the individual coils 101 and 102 that are central coils connected between the midpoints of the arm 402 and the arm 401. That is, in the circuit of the induction heating cooker 1 in FIG. 10, an equivalent state is obtained in which an open circuit is formed by the switch 21. As a result, the high-frequency current Ia flows only through the individual coils 101 and 102, which are the center coils, of the electromagnetic coil 100, and therefore differs from the maximum output power value MP1 in the induction heating operation mode. That is, in the non-contact power supply operation mode, the maximum output power value is set to the second maximum output power value MP2.
  • FIG. 8 is a graph showing the relationship between the adjustment value ⁇ on the horizontal axis and the output power value P obtained by the electromagnetic coil 100 on the vertical axis.
  • the control unit 50 controls the drive unit 40 according to the adjustment value ⁇ to adjust the magnitude of the high-frequency current I flowing through the individual coils 101 and 102.
  • the output power value P increases or decreases.
  • the output power value P corresponds to the feed power.
  • the adjustment value ⁇ is the maximum ⁇ 1
  • the maximum output power value in the non-contact power supply operation mode is represented by MP2, and this is the second maximum output power value.
  • the maximum output power value MP2 of the individual coils 101 and 102 that are the inner coils is limited to about 1,500 W.
  • the maximum output power value MP2 is about 1 ⁇ 2 of the maximum output power value MP1.
  • the state of the display unit 7, for example, the lighting state of the LED changes according to the increase / decrease in the output power value P, and half of the whole LED is in the lighting state at the maximum output power value MP ⁇ b> 2.
  • the display of the adjustment value may be a numerical value, for example, as long as it is a means capable of recognizing a change in state or a set value.
  • FIG. 9 shows the lighting state of the LED at the maximum output power value MP2 in the non-contact power supply operation mode, and FIG. 9B shows that the number of LED lighting is half of the whole. ing.
  • FIG. 9D shows how the LED lighting state changes with respect to the adjustment value ⁇ .
  • the state where all the LEDs are turned off indicates that power is not supplied to the power receiving device A.
  • FIG. 8 in the figure which shows the lighting state of the LED indicator in 2nd maximum output electric power value MP2, the state which is a half of the maximum output electric power value MP1 of induction heating operation mode was shown.
  • the control unit 50 controls the number of LED lighting to increase by two. This is shown in FIG. In this way, by controlling the operation units 5 and 6 and the display unit 7 as the output operation unit, there is no difference in the operation range and display contents between the induction heating operation mode and the non-contact power supply operation mode. Therefore, it is possible to provide an induction heating cooker that is easy to use.
  • the unit 50 may control the driving unit 40 to stop driving the individual coils 101 and 102 that are the inner coils and drive the individual coils 103 and 104 that are the outer coils. That is, it is possible to supply power more efficiently by using the individual coil having a coil diameter closer to the outer diameter of the power receiving coil 502 as a power supply coil.
  • power may be supplied by the electromagnetic coil 100 as a large power supply coil. With such a configuration, even if the positional relationship between the power receiving coil and the power feeding coil is shifted, power can be supplied efficiently.
  • the structure which mutually has the communication function which can communicate between the power receiving apparatus A which is a power receiving side, and the drive part 40 which is the power transmission side mounted in the induction cooker main body 2 is considered. Accordingly, when a power receiving object consisting of the power receiving device A is supplied with power by the electromagnetic coil 100 as a power feeding coil, a signal indicating that the power receiving object is in a power receiving state may be transmitted from the power receiving object to the control unit 50. it can. In this case, there is an effect that more accurate discrimination is possible.
  • the first power source for communication on the power receiving side is supplied from the drive unit 40 on the power transmission side, and an identification signal is transmitted from the power receiving side to the power transmission side. (Or inquiries to the power receiving device A from the power transmission side), and it is necessary to acquire and store the discrimination data by communication for each power receiving device A in advance and to check at the time of communication. There is. In order to support communication with the power receiving device A supplied by an unspecified number of power receiving device manufacturers, it is desirable to provide a common communication standard among the manufacturers.
  • a resonance circuit including the power reception coil 502 and a resonance capacitor is configured.
  • the electrical characteristics are changed by the detection unit 60 while changing the frequency of the high-frequency current supplied from the drive unit 40 to the magnetic field generating excitation circuit EX including the electromagnetic coil 100 in the range of, for example, 10 kHz to 100 kHz.
  • the load resistance R in the magnetic field generating excitation circuit EX has a maximum value at the resonance point of the resonance circuit of the power reception circuit AX of the power reception device A, and the discrimination operation for the power reception target composed of the power reception device A is performed. It can be done more accurately.
  • the induction heating cooking appliance 1 is provided in the induction heating cooking appliance main body 2, the top plate 3 with which load is mounted, and the pan P as a load by electromagnetic induction.
  • a drive unit 40 that supplies a high-frequency current to the control unit 50 and a control unit 50 that controls the drive unit 40 are provided.
  • the detection part 60 which detects the electrical characteristic of the load mounted in the top plate 3 by the electrical characteristic which concerns on the drive part 40 is provided.
  • the electrical characteristics related to the drive unit 40 include voltage, current, frequency, resistance value, temperature, or the like in the drive unit 40 itself, the electromagnetic coil 100 connected to the drive unit 40, the resonant capacitor 80, or the like.
  • the output voltage V and output current I in the drive unit 40 and the load resistance R in the magnetic field generating excitation circuit EX including the electromagnetic coil 100 and the resonance capacitor 80 can be cited.
  • the control unit 50 includes a load determination unit that determines whether the load is an object to be heated or a power reception target based on the detection result of the detection unit 60.
  • the control unit 50 determines the type of load based on the detection result of the detection unit 60. If the load is determined to be an object to be heated, the output range of the drive unit 40 is set to the first maximum output power value MP1. The first range (0 to MP1) is set and the electromagnetic coil 100 is operated as an induction heating coil in the induction heating operation mode. When it is determined that the load is a power receiving object, the output range of the drive unit 40 is set to a first range (0 to 0) having a second maximum output power value MP2 smaller than the first maximum output power value MP1. The second range (0 to MP2) narrower than MP1) is set, and the electromagnetic coil 100 is controlled to operate in a non-contact power supply operation mode in which power is supplied to a power receiving object by electromagnetic induction.
  • the output adjustment can be performed by the same operation unit 5 and 6 in the same procedure in any operation mode state.
  • the operability is not impaired.
  • the target load is an object to be heated that is heated by electromagnetic induction or a power reception target that is fed by electromagnetic induction
  • an appropriate amount of electric power can be efficiently obtained depending on the target load. It becomes possible to supply.
  • the maximum output power value is switched between the induction heating operation mode and the non-contact power supply operation mode, so that the operation is performed in the optimum power range in each operation mode.
  • excessive power supply can be suppressed in the non-contact power supply operation mode. This is because, in the non-contact power supply operation mode, the output range of the drive unit 40 is set to a second range (0 to MP2) having a second maximum output power value MP2 smaller than the first maximum output power value MP1.
  • the control unit 50 determines whether the load is an object to be heated or a power receiving object.
  • the drive unit 40 can be easily controlled with a simple control configuration.
  • Adjustment of output power Adjustment of output power in the output range of the drive unit 40 (first range: 0 to MP1, or second range: 0 to MP2) is provided in the induction heating cooker body 2.
  • the operation is performed by the operation units 5 and 6 as output operation units.
  • the heating power of the object to be heated such as the pot P or the power receiving target such as the power receiving device A is operated by the operation of the induction heating cooker body 2. Since the power supplied to the object is adjusted, the output power can be adjusted only by the operation on the induction heating cooker body 2 side, and the start and stop of the operation can also be performed on the induction heating cooker body 2 side. Since it can be done with, it improves usability.
  • the electromagnetic coil 100 includes central coils 101 and 102 as individual coils wound in a planar shape, and one disposed around the central coil. And an induction heating coil including peripheral coils 103 and 104 as two or more individual coils. Accordingly, by configuring the electromagnetic coil 100 with a plurality of individual coils, it becomes possible to selectively operate any individual coil according to the state of the load. In the induction heating operation mode, switching of the individual coils is possible. The cooking performance can be improved by switching the heating area and the efficient operation according to the shape of the pan. Further, in the non-contact power supply operation mode, by stopping the operation of unnecessary individual coils, the efficiency is improved, and it is possible to operate safely while suppressing excessive power supply.
  • the electromagnetic coil 100 driven by the drive unit 40 includes a plurality of individual coils, and has a drive circuit for each of the plurality of individual coils. .
  • the electromagnetic coil 100 driven by the drive unit 40 includes a plurality of individual coils, and has a drive circuit for each of the plurality of individual coils. .
  • the drive circuit for each of the plurality of individual coils it becomes possible to operate the necessary individual coils in accordance with the state of the load. Improvement of cooking performance can be expected by switching the heating area and the efficient operation according to the shape.
  • the efficiency is improved, and it is possible to suppress the supply of excessive power and operate safely.
  • the output power value MP2 controls the drive unit 40 to be smaller than the maximum output power value MP1 in the induction heating operation mode in which the object to be heated is heated by the electromagnetic coil 100.
  • the maximum output power value MP2 required in the non-contact power feeding operation mode is smaller than the maximum output power value MP1 required in the induction heating operation mode (example: ⁇ 3 kW) (example: ⁇ 1). .5 kW), it is possible to control the maximum output power values MP1 and MP2 to suppress unnecessary power consumption and to operate efficiently, and to suppress excessive power supply during power feeding and to operate safely. It becomes possible.
  • any one of the plurality of individual coils constituting the electromagnetic coil 100 is arbitrarily selected.
  • the high frequency current I is supplied to the individual coils, and the drive unit 40 is controlled so that the maximum output power value MP2 is smaller than the maximum output power value MP1 in the induction heating operation mode.
  • the maximum output power value MP2 required in the non-contact power feeding operation mode is smaller than the maximum output power value MP1 required in the induction heating operation mode (example: ⁇ 3 kW) (example: ⁇ 1).
  • the control unit 50 that controls the drive unit 40 is generated by an induction heating operation mode in which an object to be heated is heated by the electromagnetic coil 100 and the electromagnetic coil 100.
  • the frequency of the high-frequency current supplied from the drive unit 40 to the electromagnetic coil is switched in the non-contact power supply operation mode in which the power receiving object is supplied by electromagnetic induction by a magnetic field. That is, the operating frequency in the non-contact power feeding operation mode is larger (higher) than the maximum value in the operating frequency range of the induction heating operation mode.
  • the output range (first) can be easily achieved without requiring complicated control in the induction heating operation mode and the non-contact power supply operation mode.
  • the control unit 50 includes an induction heating operation mode in which an object to be heated is heated by the electromagnetic coil 100, and an electromagnetic by a magnetic field generated by the electromagnetic coil.
  • the resonance frequency of the resonance circuit in the magnetic field generating excitation circuit EX including the electromagnetic coil 100 is switched in the non-contact power supply operation mode in which the power receiving object is supplied by induction.
  • the maximum output power values MP1 and MP2 can be adjusted by switching the value of the resonance capacitor and changing the frequency of the resonance circuit, so that complicated control is required in the induction heating operation mode and the non-contact power supply operation mode. Therefore, the output range (first range: 0 to MP1 or second range: 0 to MP2) can be easily changed.
  • the control unit 50 operates in a full bridge circuit configuration in the induction heating operation mode in which an object to be heated is heated by the electromagnetic coil 100, and the electromagnetic coil 100
  • the circuit configuration of the drive unit 40 is switched so as to operate in a half-bridge circuit configuration.
  • the maximum output power values MP1 and MP2 can be adjusted by controlling the drive signal and switching the circuit configuration of the drive unit 40, complicated control is performed in the induction heating operation mode and the non-contact power supply operation mode. Can be easily changed without changing the output range (first range: 0 to MP1, or second range: 0 to MP2).
  • the frequency characteristic of the load resistance indicating the load characteristic when the object to be heated is placed in the magnetic field is set in advance as a determination characteristic in the control unit 50 itself. It is discriminated whether or not the power receiving object is arranged by comparing with the characteristic for discrimination which is the frequency characteristic of the load resistance indicating the load characteristic when is placed in the magnetic field. Thereby, by detecting the load placed on the top plate 3 on the induction heating cooker main body 2 side, it is possible to quickly and reliably determine whether to set the induction heating operation mode or the non-contact power supply operation mode. Furthermore, since display and operation settings are changed in accordance with the operation mode, no switching operation or the like is required, and usability is improved.
  • a power receiving object such as the power receiving device A is provided with a power receiving circuit AX that constitutes a resonance circuit including a power receiving coil 502 fed by electromagnetic induction by the electromagnetic coil 100 and a resonant capacitor. ing.
  • the induction heating cooker in the induction heating operation mode, a high-frequency current is selectively supplied to a plurality of individual coils in response to the size, shape, and position shift of the pan. Therefore, in the non-contact power supply operation mode, only individual coils that can supply the necessary power according to the maximum output power value required by the power receiving device can be obtained. Since it is made to drive, it can suppress supply of excessive electric power with respect to a receiving device, and enables efficient electric power feeding. Furthermore, since it is possible to control the power of the power receiving device from the induction heating cooker body, the usability can be improved. Moreover, leakage of unnecessary magnetic flux from the individual coil on which the power receiving device is not placed can be suppressed. Further, in the induction heating operation mode and the non-contact power supply operation mode, the output adjustment range by the operation unit and the display content by the display unit are set to be the same, so that the usability can be improved.
  • FIG. FIG. 16 is a flowchart showing a load detection processing procedure in the induction heating cooker according to the second embodiment.
  • the type of load is determined and the maximum output power value is switched.
  • the electrical characteristics of the load placed by the detection circuits 60a and 60b of the detection unit 60 are detected. Then, the load characteristic is detected by the electric characteristic by the detection unit 60.
  • the control unit 50 detects whether the load is the power receiving device A, the pan P that is the object to be heated, the non-heated item (small item, etc.), or the presence or absence of the load, and the maximum output power of the driving unit 40
  • the value MP is switched (see FIGS. 7, 8, and 10).
  • the detection unit 60 has electrical characteristics related to the electromagnetic coil 100 on which the load is placed. Detection of (electrical characteristics of the drive circuit) is started (step S11).
  • the controller 50 is insufficient for heating, but controls the phase ⁇ of the drive signal so that a high-frequency current I large enough for detection is output, and in the frequency range of 20 to 100 kHz, for example.
  • the drive unit 40 is controlled while sweeping the frequency of the high-frequency current I (drive frequency fsw) within a certain time (step S12).
  • the control unit 50 determines whether or not the load is a power reception target composed of the power receiving device A by a load determination unit that determines and detects the power reception target provided in the control unit 50. (Step S13). Note that, at the time of determination in step S13, the threshold for the determination characteristic curve T in the detection unit 60 is set for power reception target object detection.
  • step S13 If it is determined in step S13 that the load is the power receiving device A, the control unit 50 sets the maximum output value of the drive unit 40 to the second maximum output power value MP2 (step S14), and the operation unit 6 In response to the operation, power supply to the power receiving device A that is a load is started (step S15).
  • the control unit 50 controls the phase ⁇ of the drive signal so that a high-frequency current I having a magnitude sufficient for detection is output, and drives the drive.
  • the frequency fsw is set to the pan detection frequency, and the drive unit 40 is controlled (step S16).
  • Whether or not it is a heating target is determined based on the electrical characteristics at this time (step S17), and when it is determined that it is not an object to be heated (not heated), the control unit 50 stops the operation of the driving unit 40. (Step S20).
  • the control unit 50 sets the maximum output value to the first maximum output power value MP1 (step S18), and the operation unit. Heating to the load is started according to the operation 6 (step S19).
  • the threshold for the characteristic curve T for determination in the detection unit 60 is set for detecting the object to be heated.
  • the control unit 50 may control the display unit 7 to display so that it can be determined whether it is the induction heating operation mode or the non-contact power supply operation mode according to the determination result.
  • the configuration and effects of the induction heating cooker according to Embodiment 2 are summarized below.
  • the electrical characteristics of the drive unit 40 that drives the electromagnetic coil 100 for generating the magnetic field are detected by the detection circuits 60a and 60b, and the electrical characteristics (current) , Voltage, frequency), the detection unit 60 detects the load characteristic of the load arranged in the magnetic field (frequency characteristic of the load resistance). Furthermore, it is discriminate
  • the control unit 50 sets the output range of the drive unit 40 to the first range (0 to MP1) having the first maximum output power value MP1.
  • the electromagnetic coil 100 is used as an induction heating coil to control the object to be heated.
  • the control unit 50 sets the output range of the driving unit 40 to the second range having the second maximum output power value MP2 smaller than the first maximum output power value MP1.
  • the power is set to (0 to MP2) and the electromagnetic coil 100 is used as a power supply coil to control power supply to the power receiving object by electromagnetic induction.
  • the type of the load placed on the top plate 3 is automatically determined, and the normal induction is performed according to the load using the electromagnetic coil 100 that is normally used as an induction heating coil.
  • Convenience can be improved because it can be cooked and can also be operated as a non-contact power feeding device that supplies power in a non-contact manner.
  • a process for determining whether or not the object is a power receiving object and a process for determining whether or not the object is a heated object are performed, and the process of determining whether or not the object is a power receiving device is performed first.
  • the power receiving device can be reliably determined in advance, so that it is not possible to erroneously shift to the induction heating operation mode.
  • the induction heating cooker by first determining whether it is an object to be heated or a power receiving device, it is possible to reliably determine the power receiving device and to heat it by mistake. While not being able to shift to the operation, excessive power supply to the power receiving device can be prevented by more reliably suppressing the maximum output power value.
  • FIG. Embodiment 3 is an embodiment in which the maximum output power value is switched between the induction heating operation mode and the non-contact power supply operation mode.
  • FIG. 17 is a circuit diagram showing a resonance circuit including the drive unit in FIG. 17 and the relationship between the frequency and the high-frequency current (output power) for switching the maximum output power value by changing the drive frequency of the induction heating cooker according to the third embodiment. Description will be made mainly with reference to the drawings.
  • FIG. 17A is a simplified circuit diagram of a resonance circuit including the drive unit 40.
  • FIG. 17B shows the relationship between the frequency f and the high-frequency current I obtained for the frequency f.
  • the capacitor C corresponds to the resonance capacitors 81 and 83 in FIG. 7, and the reactance L corresponds to the electromagnetic coil 100.
  • the drive part 40, the control part 50, and the detection part 60 are provided like FIG.
  • the control unit 50 includes a coil L (electromagnetic coil 100) coupled to a load and a resonance capacitor C as shown in FIG.
  • a frequency that is higher by ⁇ f1 than the resonance frequency f0 obtained from the electrical characteristics of the resonance load is set as the frequency fsw1 of the drive signal, and the drive unit 40 is driven.
  • the high frequency current I becomes maximum at the resonance frequency f0, and the maximum output power value MP1 is obtained. .
  • the control unit 50 when the detection unit 60 detects that the load is placed on the electromagnetic coil 100 via the top plate 3 and the placed load is the power receiving device A, the control unit 50.
  • the resonance frequency f0 obtained from the electrical characteristics of the resonance load composed of the coil L (electromagnetic coil 100) coupled to the load and the resonance capacitor C
  • a frequency higher by ⁇ f2 is set to the frequency fsw2 of the drive signal.
  • ⁇ f2 may be a preset value or may be set to n times ⁇ f1. At this time, ⁇ f1 ⁇ f2. That is, as shown in FIG.
  • the control unit 50 provides the drive unit 40 with a maximum output power value of MP2 ⁇ MP1, and generally the maximum output power value MP2 is about 1 ⁇ 2 of the maximum output power value MP1.
  • the frequency fsw2 at which the high-frequency current I2 that can be obtained is obtained is set as the frequency of the drive signal.
  • the frequency fsw of the drive signal set in the drive unit 40 is controlled, that is, the range of the operation characteristic of the drive unit 40 is controlled by the frequency, so that the maximum output power value MP can be easily set. Therefore, the power supply operation can be efficiently performed by suppressing excessive power supply to the power receiving device A, and an additional component such as a switching circuit is not necessary and can be configured at low cost. .
  • the control unit 50 that controls the drive unit 40 is based on the induction heating operation mode in which the object to be heated is heated by the electromagnetic coil 100 and the magnetic field generated by the electromagnetic coil 100.
  • the frequency of the high-frequency current I supplied to the drive unit 40 is switched between the non-contact power supply operation mode in which power is supplied to the power receiving object by electromagnetic induction.
  • the maximum output power values MP1 and MP2 can be adjusted by changing the drive frequency fsw. Therefore, the induction heating operation mode and the non-contact power supply operation mode can be easily output without requiring complicated control.
  • the range (first range: 0 to MP1, or second range: 0 to MP2) can be changed.
  • the control unit controls the driving unit in the induction heating operation mode and the non-contact power supply operation mode.
  • the frequency of the drive signal to be supplied that is, the operating frequency in the non-contact power supply operation mode is made larger (higher) than the maximum value of the operating frequency range in the induction heating operation mode, the frequency of the high-frequency current Since the range of the maximum output power value can be adjusted, the output range in the induction heating operation mode and the non-contact power supply operation mode can be easily changed without requiring complicated control.
  • Embodiment 4 is another embodiment in which the maximum output power value is switched between the induction heating operation mode and the non-contact power supply operation mode.
  • the suppression of the maximum output power value by switching the resonance capacitor of the induction heating cooker according to Embodiment 4 will be described with reference to FIGS. 18 and 19.
  • the control unit 50 closes the switch 21 connected in parallel with the resonance capacitor 81.
  • the resonance capacitor 82 is connected in parallel to the resonance capacitor 81, and the capacitance of the resonance capacitor increases.
  • the capacity of the resonant capacitor 81 is C81
  • the capacity of the resonant capacitor 82 is C82
  • the combined capacity of C81 and C82 is C81 ', C81 ⁇ C81'.
  • L in the equations (1) and (2) is an inductance in a state where the power receiving device A as a load and the coil 100 are coupled.
  • FIG. 19A is a circuit diagram showing a resonance circuit including the drive unit 40.
  • FIG. 19B is a graph showing the relationship between the drive frequency fsw and the high-frequency current I.
  • the switch 21 When the switch 21 is closed, the resonance frequency of the circuit decreases (f0 ′). Therefore, when the drive unit 40 is operated at the drive frequency fsw, the high-frequency current I is smaller than that when the switch 21 is opened. . That is, when the load is the power receiving device A, the control unit 50 switches the switch 21 and adds C83, thereby increasing the capacity of the resonance capacitor C connected in series with the coil L, and the resonance frequency f0. Is controlled with respect to the drive frequency fsw so as to suppress the maximum output power value MP obtained.
  • the resonant capacitor 84 connected in series with the switch 22 is connected in parallel to the resonant capacitor 83, and the switch 22 is connected.
  • the same effect can be obtained by closing and increasing the capacitor capacity to lower the resonance frequency f0.
  • the individual coils 101 to 104 are exemplarily shown in the electromagnetic coil 100 including a plurality of coils shown in FIG. 2A, the present invention can also be realized by coils having other configurations.
  • the control means including the control unit 50 switches the resonance capacitor of the resonance circuit between the induction heating operation mode and the non-contact power supply operation mode. Since the maximum output power values MP1 and MP2 can be adjusted by switching the value of the resonance capacitor C and changing the resonance frequency f0 of the resonance circuit, complicated control is required in the induction heating operation mode and the non-contact power supply operation mode. Therefore, the output range (first range: 0 to MP1 or second range: 0 to MP2) can be easily changed.
  • the control unit controls the resonance frequency of the resonance load of the drive unit, Since the maximum power value can be easily suppressed, the resonance frequency is controlled by switching the resonance capacitor, so that excessive power is not supplied to the power receiving device, and control is performed so that unnecessary power is not supplied. By doing so, the power feeding operation can be performed efficiently.
  • FIG. 20A is a schematic diagram of a circuit block showing a part of the drive unit 40 of the schematic induction heating cooker 1.
  • FIG. 20A shows a full bridge circuit including the switching element pairs 401 and 402, the resonance capacitor 80, and the electromagnetic coil 100.
  • the full bridge circuit is driven by drive signals by two pairs of complementary signals a, a ′, b, b ′ shown in FIG. 20B and supplies a high-frequency current I to the electromagnetic coil 100.
  • the frequency of the drive signal is in the range of 20 to 100 kHz, and the control unit 50 sets an optimal frequency according to the electrical characteristics detected by the detection unit 60. For example, a frequency obtained by adding a value ⁇ f higher by several kHz to the resonance frequency f0 of the drive unit 40 when the electromagnetic coil 100 is coupled to a load placed on the top plate is set as the drive frequency fsw.
  • the electromagnetic coil 100 disposed in the heating unit 10 will be described as an example.
  • the electromagnetic coil 100 is displayed as a single coil.
  • the magnitude of the high-frequency current I supplied to the electromagnetic coil 100 can be adjusted by the phase difference ⁇ between the signals of the drive signals a and b (a ′, b ′) as described in other embodiments. Since the operation of the full bridge circuit is well known, the description thereof is omitted here.
  • the power supply voltage V is supplied to the semiconductor switching element pair 401 and 402 constituting the drive unit 40 through the commercial power supply 31, the diode bridge 32, and the smoothing circuit 33.
  • is applied to both ends of the resonance capacitor 80 and the electromagnetic coil 100 for each cycle of the drive frequency fsw during a period T ⁇ corresponding to the magnitude of the phase difference ⁇ ( FIG. 20 (d)).
  • I be the high-frequency current flowing through the impedance Z of the drive circuit consisting of the combined resistance of the resonant capacitor 80, the electromagnetic coil 100, and the load placed on the top plate 3.
  • the load R is a combined resistance of the resistance component of the electromagnetic coil 100 and the load.
  • the current I flowing in the drive circuit becomes maximum when ⁇ L ⁇ (1 / ⁇ c) in the equation (5) is “0”, that is,
  • R, and at this time, the maximum output power value MP is obtained.
  • the induction heating cooker 1 When the load placed on the top plate 3 is determined to be an object to be heated such as the pan P by the load determination means of the detection unit 60 and the control unit 50, the induction heating cooker 1 performs the induction heating operation.
  • the control unit 50 operates the drive unit 40 in a full bridge circuit configuration, and the drive signal is obtained so that the output power value P set by the operation units 5 and 6 not shown in FIG. 20 is obtained.
  • the phase difference ⁇ between a and b (a ′, b ′) is controlled, and the high-frequency current I supplied to the electromagnetic coil 100 is controlled.
  • the control unit 50 outputs the drive signals a, a ', B, b' are output to the drive unit 40 at the timing shown in FIG.
  • the drive signal b is always a low (L) level signal
  • the drive signal b ' is a constant H (high) level signal. Therefore, as shown in FIG. 21A, since the drive signal b supplied to the upper semiconductor switching element 402a in the semiconductor switching element pair 402 is always at the L (low) level, the semiconductor switching element 402a is driven. Not.
  • the semiconductor switching element 402b since the drive signal b 'supplied to the lower semiconductor switching element 402b is always at the H (high) level, the semiconductor switching element 402b is always in the on state.
  • the semiconductor switching element pair 401, 402 constituting the driving unit 40 has a circuit configuration shown in FIG. That is, when it is determined that the load is the power receiving device A, the induction heating cooker 1 shifts to the non-contact power feeding operation mode, and the control unit 50 controls the driving unit 40 to have a half-bridge circuit configuration. .
  • a power supply voltage V is supplied to the semiconductor switching element pair 401 and 402 constituting the drive unit 40 via an AC power supply 31, a diode bridge 32, and a smoothing circuit 33 not shown in FIG. 20.
  • the power supply voltage V is applied to both ends of the resonance capacitor 80 and the electromagnetic coil 100 for each cycle of the drive frequency fsw in a period Tw corresponding to the magnitude of the pulse width Tw (FIG. 20). (E)).
  • the magnitude of the high-frequency current I2 flowing through the electromagnetic coil 100 is 1 ⁇ 2 of the induction heating operation mode having the full bridge circuit configuration, and the maximum output power value MP obtained is also 1 ⁇ 2.
  • the control unit 50 controls the drive signal output to the drive unit 40, and the circuit configuration of the drive unit 40 is switched so that the maximum output power value MP is set. Can be suppressed.
  • the change of the circuit configuration in the simple drawings shown in FIGS. 20 and 21 has been described, but when applied to the actual driving circuit shown in FIG. 6, the semiconductor switching element pair 401 is shared, The configuration includes two half bridges.
  • the control unit 50 is operated in a full bridge circuit configuration in the induction heating operation mode.
  • the circuit configuration of the drive unit 40 is switched so as to operate with a half-bridge circuit configuration.
  • the output range (first range: 0 to MP1, or second range: 0 to MP2) can be changed.
  • the high frequency is selectively applied to the plurality of individual coils in accordance with the situation such as the size, shape, and misalignment of the pan. Since it is operated so that a current is supplied, highly efficient heating can be realized.
  • the non-contact power supply operation mode the maximum output power value can be easily suppressed by controlling the drive unit, and only the coil that can supply the necessary power according to the maximum power required by the power receiving device is driven. Therefore, the power can be supplied efficiently, and an additional component such as a switching circuit is not required, and it can be configured at low cost. Furthermore, unnecessary magnetic flux leakage from a coil on which no power receiving device is placed can be suppressed. Moreover, since it is comprised so that the electric power control of a receiving device can be performed from the induction heating cooking appliance main body, usability improves.
  • FIG. FIG. 22 is a diagram illustrating a configuration example of the operation unit according to the sixth embodiment.
  • Embodiment 6 is another embodiment in which the maximum output power value is switched between the induction heating operation mode and the non-contact power supply operation mode by a switch operation.
  • the non-contact power supply operation mode can be arbitrarily selected by an operation switch, and the induction heating operation is performed on the operation unit 5 of the induction heating cooker body 2.
  • An operation mode changeover switch 511 is provided as an operation switch for selecting either the mode or the non-contact power supply operation mode.
  • the control unit 50 controls the drive unit 40 to switch the maximum output power value MP of the drive unit 40 to the second maximum output power value MP2.
  • the operation unit 5 shown in FIG. 22 (a) has an operation mode changeover switch 511 for selecting either the induction heating operation mode or the non-contact power supply operation mode and starting the operation, and the magnitude of the power supply power value or the output power value.
  • Down switch 512 and up switch 513 operating switches are provided.
  • an operation switch of a stop switch 514 for stopping the operation is provided. Note that the types and arrangement of operation switches are merely examples, and the present invention is not limited to these.
  • the operation mode changeover switch 511 has a symbol representing the induction heating operation mode and a symbol representing the non-contact power supply operation mode.
  • the control unit 50 determines that the induction heating operation mode has been selected, and shifts to the induction heating operation mode.
  • the detector 60 detects the electrical characteristics of the load placed on the top plate 3 and detects the load characteristics based on the electrical characteristics.
  • the control unit 50 determines that the load (pan P) is heatable by the load determination unit, the control unit 50 sets the maximum output power value MP of the drive unit 40 to the first maximum output power value MP1, and the set adjustment value In order to obtain a heating output power value P corresponding to ⁇ , the driving unit 40 is controlled under a driving condition in accordance with the material and shape of the load to perform the heating operation.
  • the control unit 50 controls the drive unit 40 so as not to shift to the heating operation. The heating operation is stopped.
  • the control unit 50 determines that the non-contact power supply operation mode has been selected, and shifts to the non-contact power supply operation mode.
  • the control unit 50 uses the load determination unit. If it is determined that the power receiving device A can supply power from the load characteristics, the maximum output power value of the drive unit 40 is set to the second maximum output power value MP2, and the power supplied according to the adjustment value ⁇ is received. The drive unit 40 is controlled so as to be supplied.
  • the control unit 50 switches the drive unit 40 so as not to shift to the power feeding operation. Control and stop the power feeding operation.
  • the operation mode changeover switch 511 is pressed a plurality of times, the operation starts every time the induction heating operation mode ⁇ the non-contact power supply operation mode ⁇ the induction heating operation mode ⁇ . The mode switches.
  • the stop switch 514 When stopping the operation, by pressing the stop switch 514, the operation operating in any one of the operation modes is stopped or the selection of the operation mode is cancelled. Note that the number of times the button is pressed is an example, and the button may be identified by a difference in the length of the pressing time.
  • the operation mode changeover switch 511 is provided in the operation unit 5 to configure the switching operation unit and the operation mode can be arbitrarily selected, the usability can be improved.
  • the operation mode changeover switch 511 for switching between the induction heating operation mode and the non-contact power supply operation mode is integrated into one, and is different between the induction heating operation mode and the non-contact power supply operation mode. Since the design is displayed on the surface of the button and the stop switch 514 is provided independently, the operation switch is arranged for each function without increasing the number of operation switches. Will improve. Further, the operation mode can be selected, and the load determination time by the control unit 50 can be reduced. Furthermore, even when a load that is difficult to discriminate is placed, an appropriate operation can be performed by appropriately selecting an operation mode.
  • the operation unit 5 shown in FIG. 22B is an example in which an operation mode changeover switch is provided independently. That is, the induction heating operation mode switch 511a and the non-contact power supply operation mode switch 511b are provided, and each operation switch serves as both start and stop of the operation. For example, when the non-contact power supply operation mode switch 511b is pressed once, the control unit 50 detects that the non-contact power supply operation mode switch has been pressed, and shifts to the non-contact power supply operation mode. Since the operation after the transition is the same as that described above, details are omitted here.
  • non-contact power supply operation mode switch 511b also serves as a stop switch, if the non-contact power supply operation mode switch 511b is pressed again during the power supply operation, the control unit 50 is driven to stop the power supply operation.
  • the unit 40 is controlled.
  • the control unit 50 detects that the induction heating operation mode switch is pressed, and shifts to the induction heating operation mode. Since the operation after the transfer is the same as that described above, the details are omitted here. Since the induction heating operation mode switch 511a also serves as a stop switch, when the induction heating operation mode switch 511a is pressed again during the heating operation, the control unit 50 causes the driving unit 40 to stop the heating operation. To control.
  • the operation unit 5 illustrated in FIG. 22C is an example in which a stop switch 514 is further provided in the operation unit 5 illustrated in FIG. 22B and the operation mode changeover switch 511 and the stop switch 514 are separated. Since the operation when each operation switch is pressed is the same as that described above, the details are omitted. Further, when the operation mode changeover switch 511 is pressed so that the selected operation mode can be identified, the selected operation switch may be illuminated, although not shown here. For example, the operation switch itself is illuminated, the surroundings of the operation switch are illuminated, or the top of the top plate 3 near the target heating unit for which the operation mode is selected, such as an LED lamp. These indicators may be provided and lighted in different colors depending on the operation mode.
  • the display unit 7 has a function of displaying the operation mode so that it can be determined whether the operation mode is the induction heating operation mode or the non-contact power supply operation mode. You may make it comprise. If the pan is placed on the top plate 3, even if the non-contact power supply operation mode switch is accidentally pressed, if there is a display indicating the non-contact power supply operation mode, the user will notice that the operation is incorrect. be able to.
  • the control unit 50 detects the operation of the operation switch. However, a separately provided microcomputer or the like determines the operation state, and issues a command according to the operation to the control unit 50. The control unit 50 may be configured to control the drive unit 40. Convenience can be improved by providing the operation unit 5 with an operation mode switching switch for switching the operation mode.
  • each operation unit 5 may be provided corresponding to each heating unit.
  • You may be comprised so that the heating parts 9, 10, and 11 can be operated by arbitrary operation modes. For example, by cooking in the induction heating operation mode in the heating unit 10 and simultaneously operating the heating unit 11 in the non-contact power supply operation mode and simultaneously making sauce with a blender that operates by receiving power in a non-contact manner. The usability is improved.
  • the induction heating cooker 1 has an induction heating operation mode in which the object to be heated is heated by the electromagnetic coil 100 and the electromagnetic coil 100 in any configuration from the first embodiment to the fifth embodiment.
  • a switching operation unit including an operation unit 5 provided with an operation switch for switching between a non-contact power supply operation mode for supplying power to a power receiving object by electromagnetic induction by a generated magnetic field.
  • Induction heating cooker 1 displays a display target including a control state and an operation guide and is heated by electromagnetic coil 100 in any configuration from the first embodiment to the fifth embodiment.
  • the operation is performed in an induction heating operation mode for heating an object, or in a non-contact power supply operation mode for supplying power to a power receiving object by electromagnetic induction by a magnetic field generated by the electromagnetic coil 100.
  • the dedicated operation switch for selecting the operation mode is provided, so that the induction heating operation mode and the non-contact power supply operation mode are switched. Therefore, convenience can be improved.
  • Embodiment 7 when an adjustment value is selected in the operation unit, an output power value is determined in advance corresponding to each adjustment value (set level) in the induction heating operation mode and the non-contact power supply operation mode.
  • the embodiment which can adjust the output electric power value of an induction heating cooking appliance is shown using the output electric power value setting table.
  • FIGS. 23 to 31 are diagrams for explaining the operation in Examples 1 to 3 of the induction heating cooker 1 according to Embodiment 7, and the details of the operation of each Example will be described below.
  • description of a component is abbreviate
  • the operation unit 5 or the operation unit 6 is used to adjust the output power value P to a magnitude.
  • the control unit 50 of the induction heating cooker 1 increases the output power value P with respect to the adjustment value ⁇ without changing the adjustment range of the adjustment value ⁇ (set level).
  • the present invention relates to a method of setting a different value according to each operation mode.
  • the adjustable range of the adjustment value ⁇ (setting level) that can be adjusted using the operation unit 5 or the operation unit 6 is the same in each operation mode, and the magnitude of the output power value P with respect to the same adjustment value ⁇ .
  • the control unit 50 controls the drive unit 40 so that is different in each operation mode.
  • the magnitude of the output power value P of each of the heating units 9 to 10 of the induction heating cooker 1 is changed by changing the magnitude of the high-frequency current I supplied from the drive unit 40 to the electromagnetic coil 100. That is, the control unit 50 controls the drive unit 40 so as to obtain an output power value P having a desired magnitude, and changes the magnitude of the high-frequency current I supplied to the electromagnetic coil 100.
  • FIG. 23 is a data table showing the relationship between the adjustment value ⁇ (set level) in 10 steps, which is the adjustment range, and the output power value P.
  • FIG. 24 shows the relationship between the adjustment value ⁇ (set level) and the output power value P in FIG. 23, the adjustment value ⁇ on the horizontal axis, and the vertical axis on the vertical axis in order to make the data table of FIG. 23 easier to understand.
  • This is represented by a graph with a power value P.
  • different output power values P are set in the induction heating operation mode and the non-contact power supply operation mode.
  • This data table may be stored in advance in the memory of the control unit 50, or may be described as a data table in the program.
  • the adjustment range for example, in FIG. 23, the setting level is displayed in stages with numerical values of 1 to 10 on the display unit 7 provided in the induction heating cooker 1.
  • a desired output power value P corresponding to the adjustment value ⁇ (setting level) can be obtained by selecting and operating any one of the ten setting levels in the operation unit 6.
  • the control unit 50 controls the drive unit 40 so as to obtain the output power value P corresponding to the set adjustment value ⁇ (set level), and the magnitude of the high-frequency current I supplied to the electromagnetic coil 100 is increased. Adjust the height.
  • the maximum output power value among the output power values P in the maximum adjustment value ⁇ 1 is set in the range (adjustment range) adjustable by the operation unit 6.
  • MP, the maximum output power value MP1 when operating in the induction heating operation mode, and the output power value P including the maximum output power value MP2 when operating in the non-contact power supply operation mode are pre-induction heating cooking for each operation mode It is set by the control unit 50 of the device 1.
  • the magnitude relationship between these maximum output power values MP is MP1> MP2. That is, when the operation unit 6 is operated and the output power value P is adjusted, the magnitude of the output power value P corresponding to the set adjustment value ⁇ (set level) within the adjustable range is determined by each operation. Different output power values P are set depending on the mode.
  • the output power value P (heating power) for the adjustment value ⁇ set by the operation unit 6 is stored in advance in, for example, a memory inside the induction heating cooker 1 and is operating in the induction heating operation mode.
  • the control unit 50 determines that the operation mode is the induction heating operation mode, and the data shown in FIG. Based on the value given in the table, the drive unit 40 is controlled so that the high-frequency current I that provides an output power value of 2,000 W is supplied to the electromagnetic coil 100.
  • the control unit 50 when operating in the non-contact power supply operation mode, when the operation unit 6 is operated and the adjustment value ⁇ (set level) “8” is selected, the control unit 50 operates in the non-contact mode. It is determined that the power supply mode is in effect, and the drive unit 40 is set so that a high-frequency current I that provides an output power value of 1,000 W is supplied to the electromagnetic coil 100 based on the value given in the data table shown in FIG. Control.
  • each numerical value shown in FIG. 23 shows an example, and is not limited to these.
  • FIGS. 25 and 26 show an example in which the output power value P is set so as to change linearly with respect to the adjustment value ⁇
  • FIG. 25 and FIG. 26 show the output power value P for each operation mode. Is an example that is set to change stepwise.
  • FIGS. 25 and 26 are a data table showing an example in which the output power value P is set at three setting levels, and a graph of the data table. Also in this example, it is set so that different maximum output power values MP are obtained in each operation mode in the same adjustment range (adjustment value ⁇ ).
  • FIG. 27 is a data table showing the relationship between the adjustment value ⁇ (setting level) in 10 steps, which is the adjustment range, and the output power setting value according to the ratio ka.
  • FIG. 28 shows the relationship between the adjustment value ⁇ (setting level) and the output power setting value based on the ratio ka in FIG. 27, with the adjustment value ⁇ on the horizontal axis and the vertical axis to make the data table in FIG. 27 easier to understand. It is represented by a graph with the axis representing the output power value P.
  • This data table may be stored in advance in the memory of the control unit 50 or may be described as a data table in the program.
  • the magnitude of the output power value P (thermal power) with respect to the adjustment value ⁇ (setting level) in each operation mode is not a numerical value of the output power value P as shown in FIG. 23 of the first embodiment.
  • the output power value P (thermal power) in the non-contact power supply operation mode is a preset output corresponding to each adjustment value ⁇ in the induction heating operation mode.
  • a value obtained by multiplying a constant ratio ka (0 ⁇ ka ⁇ 1) to the magnitude of the power value P is output.
  • the output power value in the non-contact power supply operation mode over the entire adjustment range.
  • the output power value MP2 is 1 ⁇ 2 times (0.5 times) larger than the maximum output power value MP1 in the induction heating operation mode. That is, since the maximum output power value MP2 in the maximum adjustment value ⁇ 1 in the non-contact power supply operation mode is given by MP1 ⁇ ka (0 ⁇ ka ⁇ 1), it is 3,000 W ⁇ 0.5 times to 1,500 W.
  • the ratio ka is based on the output power value P in the induction heating operation mode, but conversely, the ratio kb (kb> 1) based on the output power value P in the non-contact power feeding operation mode is used. May be.
  • the ratio ka may be given as numerical data for the induction heating operation mode as shown in the output power value setting table of FIG. 27, or as shown in the output power value setting table of FIG.
  • the ratio kc may be changed for each adjustment value ⁇ .
  • FIG. 30 is a graph showing the relationship between the adjustment value ⁇ (set level) and the output power setting value P in FIG. 29 with the horizontal axis indicating the adjustment value ⁇ and the vertical axis indicating the output power value P.
  • the output power value P is changed stepwise with respect to the adjustment value ⁇ .
  • Example 3 With reference to the graph showing the relationship between the adjustment value ⁇ and the output power value P shown in FIG. 31, the operation of Example 3 in Embodiment 7 will be described.
  • the control unit 50 changes the output power value P (thermal power) according to the adjustment value ⁇ based on a mathematical formula set in advance.
  • the output power value P may be determined based on the mathematical expression, or in any mode, the output power value P is determined based on the mathematical expression. May be.
  • a mathematical formula is set in advance so that the output power value P can be represented by a linear line having a positive slope in the adjustment range.
  • the output power value P thermo power
  • the output power value P is given by a linear expression with respect to the adjustment value ⁇ in the adjustment range in any operation mode.
  • Pm is given by Equation (6).
  • the relationship between the output power value P1 with respect to the adjustment value ⁇ m in the induction heating operation mode and the maximum output power value MP1 in the adjustment range is 0 ⁇ Pm ⁇ MP1.
  • the output power value P (thermal power) with respect to the set adjustment value ⁇ can be changed by changing the slope (a or c) of the mathematical formula.
  • the control unit 50 uses a plurality of mathematical expressions, determines the output power value P according to the mathematical expressions, and supplies the electromagnetic coil 100 with the high-frequency current I from which the determined output power value P is obtained.
  • the output of the drive unit 40 is controlled.
  • the induction heating cooker 1 can set the output range of the drive unit 40 to the first range having the first maximum output power value MP1 in the induction heating operation mode, and the non-contact power supply operation mode.
  • the output range of the drive unit 40 can be set to a second range having the second maximum output power value MP2. That is, the induction heating cooker 1 controls the drive unit 40 based on a preset mathematical formula in each operation mode, so that the same adjustment value ⁇ in the adjustment range by the operation unit 6 is obtained. Different output power values P can be obtained.
  • FIG. 31A the example in which the output power value P with respect to the adjustment value ⁇ in each operation mode is obtained by a linear expression has been described. You may set to the numerical formula obtained by the variation
  • the output power value P is set to increase linearly as the adjustment value ⁇ increases, whereas the non-contact power supply operation of FIG. 31 (b). In the mode, the output power value P is set to linearly decrease as the adjustment value ⁇ increases. In the non-contact power supply operation mode of FIG. 31 (c), the output power value P is set so as to gradually increase nonlinearly as the adjustment value ⁇ increases. Further, in the non-contact power supply operation mode of FIG. 31 (d), the output power value P is set to gradually increase in a non-linear manner different from that of FIG. 31 (c) as the adjustment value ⁇ increases.
  • Embodiment 7 since it sets so that a different output electric power value may be obtained with respect to the same adjustment value for every operation mode, be aware of the operation mode. Since it is possible to adjust within the same adjustment range, there is no need to change the operation method for each operation mode, and convenience can be improved. Further, in the non-contact power supply operation mode, even when the adjustment range is set to the maximum output power value, it is possible to suppress excessive power from being supplied to the power receiving device.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
PCT/JP2016/071527 2015-07-31 2016-07-22 誘導加熱調理器及びその制御方法 WO2017022516A1 (ja)

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EP16832795.5A EP3331321B1 (de) 2015-07-31 2016-07-22 Induktionserwärmungskocher und steuerungsverfahren dafür
JP2016573627A JP6173623B2 (ja) 2015-07-31 2016-07-22 誘導加熱調理器及びその制御方法
ES16832795T ES2883583T3 (es) 2015-07-31 2016-07-22 Elemento para cocinar de calentamiento por inducción y método de control para el mismo
CN201680032720.3A CN107852784B (zh) 2015-07-31 2016-07-22 感应加热烹调器及其控制方法

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JP2018190583A (ja) * 2017-05-01 2018-11-29 三菱電機株式会社 誘導加熱調理器
JP2020113394A (ja) * 2019-01-09 2020-07-27 三菱電機株式会社 非接触受電装置および非接触給電システム
CN112398188A (zh) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 电器设备及电器设备的工作方法
WO2022054227A1 (ja) * 2020-09-11 2022-03-17 三菱電機株式会社 加熱調理器及び加熱調理器システム
JP2022545004A (ja) * 2019-08-19 2022-10-24 ▲広▼▲東▼美的白色家▲電▼技▲術▼▲創▼新中心有限公司 出力制御装置、方法及び記憶媒体
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KR102653030B1 (ko) * 2018-11-19 2024-03-28 엘지전자 주식회사 삼상 전원이 적용되는 유도 가열 장치의 용기 감지 방법
US11968765B2 (en) * 2019-03-01 2024-04-23 The Vollrath Company, L.L.C. Induction cooking system
CN112394244B (zh) * 2019-08-19 2021-09-14 广东美的白色家电技术创新中心有限公司 一种检测电路、电器及控制方法
CN112087831A (zh) * 2020-08-14 2020-12-15 中山市合硕高品电器有限公司 可显示感应区域范围及锅具偏离识别装置及方法
CN114688952B (zh) * 2020-12-29 2023-12-01 佛山市顺德区美的电热电器制造有限公司 电磁加热设备及其锅具偏移检测方法和加热控制系统
CN113613354B (zh) * 2021-10-09 2021-12-21 江苏新恒基特种装备股份有限公司 一种加热功耗控制方法及感应加热装置

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ES2883583T3 (es) 2021-12-09
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CN107852784B (zh) 2020-11-10
CN107852784A (zh) 2018-03-27
EP3331321A1 (de) 2018-06-06
JPWO2017022516A1 (ja) 2017-08-03
EP3331321A4 (de) 2019-03-20

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