WO2014167814A1 - 誘導加熱装置 - Google Patents
誘導加熱装置 Download PDFInfo
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- WO2014167814A1 WO2014167814A1 PCT/JP2014/001960 JP2014001960W WO2014167814A1 WO 2014167814 A1 WO2014167814 A1 WO 2014167814A1 JP 2014001960 W JP2014001960 W JP 2014001960W WO 2014167814 A1 WO2014167814 A1 WO 2014167814A1
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- heating
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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
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
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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
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- the present invention relates to an induction heating device, and more particularly to an induction heating cooker that induction-heats an object to be heated such as a cooking pan placed on a top plate.
- Patent Document 3 An induction heating cooker that can simultaneously inductively heat a plurality of objects to be heated placed at arbitrary locations on a top plate has attracted attention (see, for example, Patent Document 3).
- an induction heating cooker a large number of heating coils arranged in a matrix and a dedicated inverter for each heating coil are provided to detect whether an object to be heated is placed.
- High frequency current for induction heating is applied only to the appropriate heating coil, depending on the mounting status of one or more objects to be heated on the top plate, which is grasped by supplying high frequency current from each inverter to the corresponding heating coil. Is supplied.
- Patent Document 4 cannot detect whether or not an object to be heated is placed on a heating coil in which the electric circuit between the inverter and the inverter is cut off. It has the subject that the mounting condition of a heating object cannot be recognized.
- the high-frequency current for induction heating is the induction heating current, and the determination of whether or not the object to be heated is placed above the heating coil, and therefore A high frequency current that is very small compared to the induction heating current supplied to the heating coil is called a pan detection current.
- JP 2012-124081 A JP-A-9-140561 US Pat. No. 7,759,616 European Patent Application No. 2380399
- the present invention solves the conventional problem, and includes a plurality of heating coils and a number of inverters smaller than the number of heating coils, and appropriately selects one or more objects to be heated placed in an arbitrary place.
- An object is to provide an induction heating apparatus capable of induction heating.
- an induction heating apparatus of the present invention includes a top plate for placing an object to be heated, a plurality of heating coils, a plurality of inverters, a plurality of switching circuits, a command means, And a sensor and a pan detection means.
- the plurality of heating coils are arranged below the top plate and include first and second heating coils.
- the plurality of inverters includes first and second inverters and supplies power to the heating coil. Note that the number of inverters is smaller than the number of heating coils.
- the plurality of switching circuits switch the electric circuit of each heating coil so that the heating coil is connected to any inverter or not connected to any inverter.
- the command means controls power supply by the inverter and switching of the switching circuit.
- the sensor detects the response of the resonance circuit including the heating coil to the power supply by the inverter.
- the pan detection means detects whether or not an object to be heated is placed on the heating coil in accordance with the output of the sensor.
- the pan detecting means is mounted, and the object to be heated is mounted on the first heating coil.
- the command means detects that the object to be heated is not placed on the second heating coil, the command means prevents the first heating coil or the second heating coil from being connected to the first inverter. The switching circuit is switched.
- an induction heating current is supplied only to the heating coils on which the object to be heated is placed without providing the same number of inverters as the number of heating coils.
- the pan detection current can be supplied to the heating coil on which the object to be heated is not placed.
- a new circuit can be formed with another inverter by the switching circuit, and induction heating can be performed separately.
- an induction heating apparatus including a plurality of heating coils and a smaller number of inverters than the number of heating coils, conduction loss due to unnecessary energization is prevented and leakage magnetic field is suppressed, and an arbitrary place is provided.
- One or more objects to be heated can be appropriately induction-heated.
- FIG. 1 is a schematic top view of the induction heating apparatus according to the first embodiment.
- FIG. 2 is a circuit block diagram of the induction heating apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating a placement position of an object to be heated on the induction heating apparatus in the first embodiment.
- FIG. 4 is a diagram illustrating one state of the switching circuit according to the first embodiment.
- FIG. 5 is a diagram illustrating a placement position of an object to be heated on the induction heating apparatus according to the second embodiment.
- FIG. 6 is a diagram illustrating one state of the switching circuit according to the second embodiment.
- FIG. 7 is a diagram illustrating a placement position of an object to be heated on the induction heating device in the third embodiment.
- FIG. 1 is a schematic top view of the induction heating apparatus according to the first embodiment.
- FIG. 2 is a circuit block diagram of the induction heating apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating a placement position of an object to be heated
- FIG. 8 is a diagram illustrating a state of the switching circuit according to the third embodiment.
- FIG. 9 is a diagram illustrating the arrangement of heating coils and the grouping of heating coils in the induction heating apparatus according to the fourth embodiment.
- FIG. 10 is a circuit block diagram of the induction heating apparatus according to the fourth embodiment.
- FIG. 11 is an enlarged view showing a placement position of an object to be heated and grouping of heating coils in the induction heating apparatus according to the fourth embodiment.
- FIG. 12 is an enlarged view showing the placement position of the object to be heated and the grouping of the heating coils in the induction heating apparatus according to the fourth embodiment.
- FIG. 13 is a circuit block diagram of the induction heating apparatus according to the fifth embodiment.
- An induction heating apparatus includes a top plate for placing an object to be heated, a plurality of heating coils, a plurality of inverters, a plurality of switching circuits, a command means, a sensor, and a pan detection. Means.
- the plurality of heating coils are arranged below the top plate and include first and second heating coils.
- the plurality of inverters includes at least first and second inverters and supplies power to the heating coil. Note that the number of inverters is smaller than the number of heating coils.
- the plurality of switching circuits switch the electric circuit of each heating coil so that the heating coil is connected to any inverter or not connected to any inverter.
- the command means controls power supply by the inverter and switching of the switching circuit.
- the sensor detects the response of the resonance circuit including the heating coil to the power supply by the inverter.
- the pan detection means detects whether or not an object to be heated is placed on the heating coil in accordance with the output of the sensor.
- the pan detecting means is mounted, and the object to be heated is mounted on the first heating coil.
- the command means detects that the object to be heated is not placed on the second heating coil, the command means prevents the first heating coil or the second heating coil from being connected to the first inverter. The switching circuit is switched.
- an induction heating current is supplied only to the heating coils on which the object to be heated is placed without providing the same number of inverters as the number of heating coils.
- the pan detection current can be supplied to the heating coil on which the object to be heated is not placed.
- a new circuit can be formed with another inverter by the switching circuit, and induction heating can be performed separately.
- an induction heating apparatus including a plurality of heating coils and a smaller number of inverters than the number of heating coils, conduction loss due to unnecessary energization is prevented and leakage magnetic field is suppressed, and an arbitrary place is provided.
- One or more objects to be heated can be appropriately induction-heated.
- the present invention is particularly effective for an induction heating apparatus provided with a number of heating coils in a matrix.
- the command unit is configured such that the first heating coil constitutes the first inverter and the electric circuit, and the second heating coil constitutes the second inverter and the electric circuit.
- the switching circuit is switched.
- the heating coil on which the object to be heated is not placed can constitute a separate electric path from the heating coil on which the object to be heated is placed and supplied with the induction heating current, and the pan detection from another inverter. A current can be supplied.
- 3rd invention WHEREIN In 1st invention, when a pan detection means judges that the single to-be-heated material was mounted in two or more adjacent heating coils, two or more commanding means are adjacent. The switching circuit is switched so that the heating coil constitutes an electric circuit with the first inverter.
- one inverter can be assigned to a plurality of heating coils that heat a single object to be heated, and an induction heating current can be supplied from the inverter.
- the command means when the power supplied from the first inverter to two or more adjacent heating coils exceeds a predetermined value, the command means The switching circuit is switched so that at least one heating coil forms an electric circuit with the second inverter.
- induction heating currents can be supplied to the heating coils from a plurality of inverters.
- the cooling function for the switching element may be omitted. Therefore, from the viewpoint of cost and design freedom, the present invention particularly provides a large number of heating coils in a matrix form. It is effective for the induction heating device provided in
- the switching circuit is switched so that the heating coil on which the object to be heated is not placed forms an electric circuit with any inverter. It is.
- a smaller number of inverters than the number of heating coils can be used as effectively as possible. For example, assuming that one object to be heated is placed on one heating coil, the same number of objects to be heated as the number of inverters can be induction-heated separately at the same time.
- the auxiliary circuit further includes an auxiliary circuit that cannot supply the induction heating current but can supply the pan detection current.
- the switching circuit is switched so as to constitute an electric circuit.
- control device further comprises an operation unit for instructing the command means to start heating and stop heating, and the command means responds to the instruction to start heating from the operation unit. Is switched.
- the present invention is particularly effective in an induction heating apparatus provided with a number of heating coils in a matrix. Since such an induction heating apparatus can place a heated object at an arbitrary place on the top board, for example, the heated object once placed may be moved to another place immediately afterwards. This is because even if an object to be heated is placed, heating is not necessarily started at that position.
- FIG. 1 is a schematic top view of the induction heating apparatus according to the first embodiment of the present invention
- FIG. 2 is a circuit block diagram of the induction heating apparatus according to the present embodiment.
- FIG. 1 and FIG. 2 each element and circuit configuration constituting the induction heating apparatus 10 according to the present embodiment will be described in detail.
- the induction heating device 10 includes a flat top plate 13 made of an electrical insulator such as glass or ceramic for placing an object to be heated such as a pan on its upper surface.
- the induction heating device 10 includes a DC power supply 49 including a diode bridge 41, a choke coil 42 and a smoothing capacitor 43, a diode bridge 51, a choke coil 52 and a smoothing capacitor in order to rectify and smooth the electric power from a commercial AC power supply 40.
- DC power supply 59 including 53.
- the negative bus of the DC power supply 59 is connected to the negative bus of the DC power supply 49 and has the same potential as the negative bus of the DC power supply 49.
- the induction heating apparatus 10 includes three heating coils (a heating coil 11a, a heating coil 11b, and a heating coil 11c) that are provided in a horizontal row below the top plate 13 and have substantially the same shape and the same configuration.
- the heating coil 11a corresponds to a first heating coil
- the heating coil 11b corresponds to a second heating coil.
- the high-frequency magnetic field generated by the high-frequency current flowing through the heating coil is transmitted to a metal pan or the like that is the object to be heated, and eddy current is generated in the object to be heated.
- Induction heating is performed by generating heat according to the magnitude of the eddy current and the specific resistance of the object to be heated.
- the induction heating device 10 has three resonance circuits (a resonance circuit 72a, a resonance circuit 72b, and a resonance circuit 72c).
- the resonance circuit 72a is configured by connecting a heating coil 11a and a resonance capacitor 71a in series. One end of the resonance circuit 72a is connected to the negative electrode bus of the DC power supply.
- the resonance circuit 72b is configured by connecting a heating coil 11b and a resonance capacitor 71b in series. One end of the resonance circuit 72b is connected to the negative electrode bus of the DC power supply.
- the resonance circuit 72c is configured by connecting a heating coil 11c and a resonance capacitor 71c in series. One end of the resonance circuit 72c is connected to the negative electrode bus of the DC power supply.
- the induction heating apparatus 10 includes an inverter 46 that is a first inverter and an inverter 56 that is a second inverter.
- the inverter 46 is configured by connecting in series a switching element 44 having a reverse conducting diode connected in parallel and a switching element 45 having a reverse conducting diode connected in parallel.
- the inverter 56 includes a switching element 54 in which reverse conducting diodes are connected in parallel and a switching element 55 in which reverse conducting diodes are connected in parallel.
- the drive circuit 48 drives the inverter 46 by performing energization control of the switching elements 44 and 45.
- the drive circuit 58 drives the inverter 56 by performing energization control of the switching elements 54 and 55.
- the induction heating device 10 has three switching circuits (a switching circuit 81a, a switching circuit 81b, and a switching circuit 81c).
- the switching circuit 81a connects the other end of the resonance circuit 72a to any of a connection point between the switching element 44 and the switching element 45 and a connection point between the switching element 54 and the switching element 55, or to any of them. Is selected according to the command from the command means 23, and the electric circuit of the heating coil 11a is determined.
- the switching circuit 81b connects the other end of the resonance circuit 72b to a connection point between the switching element 44 and the switching element 45 and a connection point between the switching element 54 and the switching element 55, or to any of them. Is selected according to the command from the command means 23, and the electric circuit of the heating coil 11b is determined.
- the switching circuit 81c connects the other end of the resonance circuit 72c to any of a connection point between the switching element 44 and the switching element 45 and a connection point between the switching element 54 and the switching element 55, or to any of them. Is selected according to the command from the command means 23, and the electric path of the heating coil 11c is determined.
- the heating coils 11a to 11c are connected in parallel with the inverter 46 and switched with the switching element 54.
- the connection point with the element 55 it is connected in parallel with the inverter 56.
- the resonance circuit 72a forms an electric circuit with the inverter 46 by the switching circuit 81a.
- the resonance circuit 72b constitutes an electric circuit with the inverter 46 by the switching circuit 81b.
- the resonance circuit 72c forms an electric circuit with the inverter 56 by the switching circuit 81c.
- the induction heating device 10 includes a sensor group 21 including a sensor 21a for the resonance circuit 72a, a sensor 21b for the resonance circuit 72b, and a sensor 21c for the resonance circuit 72c.
- the sensor 21a detects the voltage generated in the resonance capacitor 71a and the current flowing in the resonance circuit 72a.
- the sensor 21b detects the voltage generated in the resonance capacitor 71b and the current flowing in the resonance circuit 72b.
- the sensor 21c detects the voltage generated in the resonance capacitor 71c and the current flowing in the resonance circuit 72c.
- the voltage generated in the resonance capacitor and the current flowing in the resonance circuit are detected in response to energization of the heating coils 11a, 11b, and 11c.
- the type of physical quantity to be detected and the detection location are not limited to the present embodiment.
- the sensors 21a, 21b, and 21c use, for example, a current transformer to convert the voltage into a voltage that can be processed by a comparator or a microcomputer.
- a current transformer to convert the voltage into a voltage that can be processed by a comparator or a microcomputer.
- the voltage can be lowered to a voltage that can be processed by a comparator or a microcomputer.
- the pan detection means 22 determines whether or not a heated object such as a pan is placed on each of the heating coils 11a, 11b, and 11c according to the detection results of the sensors 21a to 21c.
- the pan detection means 22 treats the same as the heating coil on which the object to be heated is not placed and supplies a pot detection current. Thereby, if a to-be-heated material is moved before induction heating, the pan detection means 22 can recognize the change.
- the pan detection means 22 repeatedly supplies a pan detection current to the heating coil on which the object to be heated is not placed and the heating coil on which the object to be heated is placed and has not started heating to detect the pan. Do.
- the pan detection means 22 can recognize the movement of the object to be heated by reading the change from the output of the sensor.
- the command means 23 described later outputs a heating stop instruction signal.
- the operation unit 12 is provided in the vicinity of the center of the user side (the lower side in FIG. 1) on the top board 13, and outputs a command signal for starting or stopping heating, adjusting the thermal power, etc. according to the operation content of the user. To do.
- the command unit 23 drives the drive circuit 48 for driving the inverter 46 and the drive circuit 58 for driving the inverter 56 according to the command signal from the operation unit 12. Output a signal.
- the command unit 23 outputs a signal for switching the connection of the switching circuits 81a to 81c based on the detection result of the pan detection unit 22.
- the pan detection means 22 and the instruction means 23 are comprised by software, and are contained in the control means 24 comprised with a microcomputer.
- the snubber capacitor 47 is connected in parallel with the switching element 45 in order to reduce switching loss that occurs when the switching element 44 and the switching element 45 are turned off.
- the snubber capacitor 57 is connected in parallel with the switching element 55 in order to reduce switching loss that occurs when the switching element 54 and the switching element 55 are turned off.
- connection state of the switching circuits 81a to 81c shown in FIG. 2 indicates the initial state of the switching circuits 81a to 81c, that is, the connection state when the main power supply (not shown) is turned on. As shown in FIG. 1, it is assumed that an object to be heated is not placed on the top plate 13 when the main power is turned on.
- the inverter 46 starts to supply the pot detection current to the resonance circuits 72a and 72b and the inverter 56 to the resonance circuit 72c, respectively, according to the initial state of the switching circuits 81a to 81c.
- FIG. 3 shows a state in which an object to be heated 91 is placed on the heating coil 11a of the induction heating apparatus 10 shown in FIG.
- the sensor 21a causes the resonance circuit 72a corresponding to the pan detection current supplied from the inverter 46. Current and the voltage of the resonant capacitor 71a are detected.
- the pan detection means 22 determines that the object to be heated 91 is placed on the heating coil 11a according to the output of the sensor 21a.
- the pan detection current is supplied from the inverter 46 to the resonance circuit 72b, and the pan detection means 22 does not place an object to be heated on the heating coil 11b according to the output of the sensor 21b.
- the inverter 56 supplies the pan detection current to the resonance circuit 72c, and the pan detection means 22 determines that the object to be heated is not placed on the heating coil 11c according to the output of the sensor 21c.
- the command means 23 is configured such that the heating coil 11a on which the object to be heated 91 is placed and the heating coil 11b on which the object to be heated 91 is not placed are the same inverter and electric circuit. So that the switching circuit 81b is switched.
- FIG. 4 is a diagram showing a state in which the electric circuit is determined by the switching circuits 81a to 81c as described above in the circuit configuration of the induction heating apparatus 10 shown in FIG.
- an object to be heated 91 is placed on the heating coil 11a.
- the switching circuit 81a to 81c causes the inverter 46 to form an electric circuit only with the resonance circuit 72a.
- the inverter 56 includes the resonance circuit 72b. , 72c and an electric circuit.
- the command unit 23 causes the inverter 46 to start supplying the induction heating current to the heating coil 11a.
- the induction heating device 10 drives the heating coil 11a using the inverter 46 and induction-heats the article 91 to be heated.
- the command unit 23 In order to monitor whether another object to be heated is placed on the heating coils 11b and 11c during the induction heating, the command unit 23 repeatedly supplies the inverter 56 with the pot detection current to the heating coils 11b and 11c. Let it be done.
- the induction heating current is supplied from the inverter 46 only to the heating coil 11a on which the article to be heated 91 is placed.
- the pot detection current is supplied from the inverter 56 to the heating coils 11b and 11c.
- the heating coil can be in a state where it can be detected that another object to be heated has been placed.
- the command unit 23 switches the switching circuit immediately before the start of heating in response to the instruction to start heating from the operation unit 12.
- the electric circuit between the heating coil 11a on which the object to be heated 91 is placed and the inverter 46 is held, and the heating coil 11b on which the object to be heated 91 is not placed constitutes an electric circuit with the inverter 56.
- the switching circuit 81b is switched. However, it is not limited to this embodiment.
- the switching circuit 81a switches so that the electric circuit between the heating coil 11b on which the object to be heated 91 is not placed and the inverter 46 is held, and the heating coil 11a on which the object to be heated 91 is placed constitutes an electric circuit with the inverter 56. Even if this is done, the same effect as in the present embodiment can be obtained.
- FIG. 5 shows a state in which an object to be heated 92 wider than the object to be heated 91 is placed on the heating coils 11a and 11b of the induction heating apparatus 10 shown in FIG.
- the inverter 46 changes to the resonance circuits 72a and 72b and the inverter 56 according to the initial state of the switching circuits 81a to 81c shown in FIG. Starts supplying the pan detection current to the resonance circuit 72c.
- the sensor 21a detects the pot detection current supplied from the inverter 46.
- the current of the corresponding resonance circuit 72a and the voltage of the resonance capacitor 71a are detected.
- the pan detection means 22 determines that the object to be heated 91 is placed on the heating coil 11a according to the output of the sensor 21a.
- pan detection current is also supplied from the inverter 46 to the resonance circuit 72b, and the pan detection means 22 determines that the object to be heated is also placed on the heating coil 11b according to the output of the sensor 21b.
- the pan detection means 22 recognizes that a single object 92 is placed on the heating coils 11a and 11b. .
- the pan detection means 22 determines that the object to be heated is not placed on the heating coil 11c according to the output of the sensor 21c.
- the command means 23 is configured such that the heating coils 11a and 11b on which the single object 92 is placed continuously constitute an electric circuit with the inverter 46, and the heating coil 11c continues to be the inverter.
- the state of the switching circuits 81a to 81c is maintained so as to constitute an electric circuit with the circuit 56.
- FIG. 6 is a diagram showing a state where the electric circuit is determined by the switching circuits 81a to 81c as described above in the circuit configuration of the induction heating apparatus 10 shown in FIG.
- a single heated object 92 is placed on the heating coils 11a and 11b, and the inverter 46 forms an electric circuit with the resonance circuits 72a and 72b by the switching circuits 81a to 81c.
- the inverter 56 constitutes an electric circuit with the resonance circuit 72c.
- the command unit 23 causes the inverter 46 to start supplying induction heating current to the heating coils 11a and 11b.
- the induction heating device 10 drives the heating coils 11 a and 11 b using the inverter 46 to induction-heat the article 92 to be heated.
- the command means 23 causes the inverter 56 to repeatedly supply the pot detection current to the heating coil 11c.
- induction heating is performed from the inverter 46 to the heating coils 11a and 11b on which the wide object 92 is placed.
- a current is supplied, and a pan detection current is supplied from the inverter 56 to the heating coil 11c.
- these heating coils can be set in a state where the placement of another object to be heated can be detected.
- the inverter 56 can perform new induction heating.
- the determination can be made according to the time interval between the pot detection in the coil 11a and the pot detection in the heating coil 11b.
- the pan detection means 22 makes an incorrect determination.
- the pan detection means 22 determines based on the current value and voltage value obtained from the resonance circuit, the difference in the material of the object to be heated can also be detected. If the object is made of different metals, the pan can be detected normally.
- the present embodiment it is possible to drive all the heating coils by only one inverter to perform induction heating even for a single object to be heated having a size that spans all three heating coils. It is.
- an inverter having an output of 4 kW is required to drive all the heating coils with one inverter. Incurs an increase in component costs.
- the switching circuit constitutes an electric circuit so that one of the four heating coils is driven by one inverter and the other two is driven by the other inverter, Parts capable of supplying 2 kW of power can be used for each inverter, and costs can be reduced.
- FIG. 7 shows a state in which an object to be heated 91 is newly placed on the heating coil 11b of the induction heating apparatus 10 shown in FIG.
- the sensor 21b is a resonant circuit corresponding to the pan detection current supplied from the inverter 56.
- the current of 72b and the voltage of the resonance capacitor 71b are detected.
- the pan detection means 22 determines that an object to be heated is also placed on the heating coil 11b according to the output of the sensor 21b.
- the pan detection means 22 is configured such that the object to be heated placed on the heating coil 11 b is different from the object to be heated 91. Recognize that the object 93.
- pan detection current is also supplied from the inverter 56 to the resonance circuit 72c, but the pan detection means 22 determines that no object to be heated is placed on the heating coil 11c according to the output of the sensor 21c. To do.
- the command means 23 is configured such that the heating coils 11a and 11b on which the objects to be heated 91 and 93 are respectively placed constitute an electric circuit with the inverters 46 and 56, respectively, and the heating coil 11c.
- the state of the switching circuits 81a and 81b is maintained and only the switching circuit 81c is switched so that no inverter forms an electric circuit.
- FIG. 8 is a diagram showing a state in which the electric circuit is determined by the switching circuits 81a to 81c as described above in the circuit configuration of the induction heating apparatus 10 shown in FIG.
- the objects to be heated 91 and 93 are placed on the heating coils 11a and 11b, respectively, and the inverters 46 and 56 are connected to the resonance circuits 72a and 72b by the switching circuits 81a to 81c, respectively.
- the heating coil 11c does not constitute an electric circuit with any inverter.
- the command unit 23 causes the drive circuit 58 that drives the inverter 56 to start supplying the induction heating current to the heating coil 11b.
- the induction heating apparatus 10 drives the heating coils 11a and 11b using the inverters 46 and 56, respectively, and induction-heats the objects to be heated 91 and 93 separately.
- the same number of objects to be heated can be induction-heated.
- the switching operation of the switching circuit 81c may be performed in response to the pan detection by the pan detection means 22 or in response to the heating start command signal from the command means 23. Conceivable.
- the command unit 23 switches the switching circuit immediately before the start of heating in response to the instruction to start heating from the operation unit 12.
- FIG. 9 is a diagram showing the arrangement of the heating coils in the induction heating apparatus according to the present embodiment, and the grouping of the heating coils constituting the same inverter and electric circuit when the main power source is turned on.
- FIG. 10 is a circuit block diagram of the induction heating apparatus according to the present embodiment.
- the induction heating apparatus 20 is provided on the top plate 13 with 45 heating coils arranged in a matrix of 5 rows and 9 columns below the top plate 13.
- the operation unit 12 is provided.
- only three of the 45 heating coils are provided with reference numerals (11aa, 11ab, 11ei).
- the heating coil group 101 includes 10 heating coils including the heating coil 11aa and the heating coil 11ab.
- a group 105 of heating coils is constituted by ten heating coils including the heating coil 11ei.
- the heating coil group 102, group 103, and group 104 are configured by 10 heating coils, 5 heating coils, and 10 heating coils, respectively.
- the inverter 46 constitutes an electric circuit with 10 heating coils included in the group 101, and the inverter 56 and the inverter 86 respectively connect the electric circuit with the heating coil included in the group 102 and the group 105. Shall be composed.
- the inverter 66 and the inverter 76 constitute an electric circuit with each of the five heating coils included in the group 103 and the ten heating coils included in the group 104, respectively.
- each inverter is configured by connecting two switching elements (not shown) connected in parallel with reverse conducting diodes.
- DC power supplies including a DC power supply 49, a DC power supply 59, and a DC power supply 89 rectify and smooth the power from a commercial AC power supply (not shown), and supply power to the corresponding inverters.
- the five drive circuits including the drive circuit 48, the drive circuit 58, and the drive circuit 88 respectively drive the corresponding inverters in response to the command signal from the command means 33.
- FIG. 10 shows a snubber capacitor 47, a snubber capacitor 57, and a snubber capacitor 87.
- FIG. 10 illustrates a resonance capacitor 71aa, a resonance capacitor 71ab, a resonance capacitor 71ei, a resonance circuit 72aa, a resonance circuit 72ab, and a resonance circuit 72ei.
- FIG. 10 illustrates a switching circuit 81aa, a switching circuit 81ab, and a switching circuit 81ei.
- Each switching circuit determines an electric circuit between each heating coil and each inverter so that each heating coil constitutes an electric circuit with any inverter or each heating coil does not constitute an electric circuit with any inverter.
- the sensor group 31 includes 45 sensors, and each sensor detects a voltage generated in each resonance capacitor and a current flowing in each resonance circuit.
- the pan detecting means 32 determines whether or not an object to be heated is placed on each heating coil according to the detection result of each sensor of the sensor group 31.
- the command means 33 receives the command signal from the operation unit 12, outputs a signal for controlling the energization of the switching element to the five drive circuits, and controls the five inverters.
- the command means 33 outputs a signal for switching the connection of each switching circuit according to the detection result of the pan detection means 32.
- the pan detecting means 32 and the command means 33 are included in a control means 34 constituted by a microcomputer.
- the pan detection means 32 treats the same as the heating coil on which the object to be heated is not placed, and supplies a pan detection current. Thereby, if a to-be-heated material is moved before induction heating, the pan detection means 32 can recognize the change.
- the pan detection means 32 repeatedly supplies a pan detection current in order to the heating coil on which the object to be heated is not placed and the heating coil on which the object to be heated is placed and has not started heating to detect the pan. Do.
- the pan detection means 32 can recognize the movement of the object to be heated by reading the change from the output of the sensor.
- the command means 33 outputs a heating stop instruction signal.
- each inverter When the main power is turned on, each inverter repeatedly supplies the pan detection current in turn to the heating coils included in the corresponding group.
- FIG. 11 and 12 are diagrams in which a part of FIG. 9 is enlarged to show a state in which the heated object 94 is placed on the top plate 13 of the induction heating apparatus 20.
- the pan detection means 32 is included in the group 102 according to the output of each sensor with respect to the pan detection current. It is determined that the object to be heated 94 is placed on the heating coil 11dd, the heating coil 11ed, and the heating coil 11de and the heating coil 11ee included in the group 103.
- the command means 33 causes the heating coils 11dd and 11ed to be incorporated into the group 103 as shown in FIG.
- the corresponding switching circuit is switched so that the heating coil 11ae, the heating coil 11be, and the heating coil 11ce that are not placed are incorporated into the group 102.
- the command unit 33 instructs the inverter 66 in charge of the group 103 to perform induction heating to the heating coils 11 dd, 11 de, 11 ed, and 11 ee included in the group 103. Start supplying current. In this way, the induction heating device 20 drives the four heating coils using the inverter 66 to inductively heat the article 94 to be heated.
- the command means 33 includes inverters 46, 56, 76, In 86, the pan detection current is repeatedly supplied to each heating coil included in the corresponding group.
- the induction heating current is supplied from the inverter 66 only to the four heating coils on which the article 94 to be heated is placed.
- the pan detection current is supplied to the other heating coils.
- these heating coils can be set in a state where the placement of another object to be heated can be detected.
- the switching operation of the switching circuit may be performed in response to pan detection by the pan detection means 32 or in response to a heating start command signal from the command means 33.
- the command means 33 since the switching operation is performed every time the object to be heated is moved, the operation may be wasted in some cases. For example, when the switching circuit is a relay circuit, an unnecessary switching operation not only generates a clicking noise each time, but also increases the possibility of failure. Therefore, it is desirable for the command means 33 to switch the switching circuit immediately before the start of heating in response to the heating start instruction from the operation unit 12.
- the induction heating device 20 has five inverters, but if it is an induction heating device having one inverter less than the maximum number of heating coils, the same operation as in the above embodiment is performed. And similar effects can be obtained.
- the 45 heating coils are grouped as shown in FIG. This grouping can be appropriately determined according to the number of inverters, the number of heating coils, the position, the frequency of use, and the like, and is not limited to the present embodiment.
- the DC power supply, inverter, etc. may have any configuration as long as they perform the same function.
- a configuration in which one system of DC power supply is provided and power is supplied from the DC power supply to all inverters is also possible.
- heating coils are arranged in a matrix in which 5 heating coils are arranged in 5 rows and 9 columns, but the present invention is not limited to this configuration.
- the same effect as in the present embodiment can be obtained even in a configuration in which the rows of heating coils are shifted to either the left or right every other row.
- FIG. 13 is a circuit block diagram of the induction heating apparatus according to the present embodiment. 13 differs from FIG. 10 in that 45 auxiliary circuits are provided. However, only the auxiliary circuit 73aa, the auxiliary circuit 73ab, and the auxiliary circuit 73ei are shown.
- the 45 auxiliary circuits are connected to the 45 switching circuits, respectively, and supply the pot detection current to the corresponding heating coils via the switching circuit.
- the specifications that allow the induction heating current to be supplied are not required for the auxiliary circuit.
- the pan detection current can be supplied from the corresponding auxiliary circuit to the heating coil on which the object to be heated is not placed.
- the number of inverters smaller than the number of heating coils is used, and the connection between the heating coils and the inverters is switched, thereby placing the object to be heated. Only the necessary heating coil can be operated according to the above. In this way, it is possible to prevent unnecessary induction heating current from being supplied to the heating coil on which the object to be heated is not placed.
- the cost can be reduced while maintaining the safety of the device, so it is particularly effective for induction heating cookers for home use and business use. It is.
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- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
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Abstract
Description
図1は、本発明の実施の形態1にかかる誘導加熱装置の概略上面図であり、図2は、本実施の形態にかかる誘導加熱装置の回路ブロック図である。
以下、本発明の実施の形態2にかかる誘導加熱装置について説明する。
以下、本発明の実施の形態3にかかる誘導加熱装置について説明する。
以下、本発明の実施の形態4にかかる誘導加熱装置について説明する。
以下、本発明の実施の形態5にかかる誘導加熱装置について説明する。
11a,11b,11c,11aa,11ab,11ae,11be,11ce,11dd,11de,11ed,11ee,11ei 加熱コイル
12 操作部
13 天板
21,31 センサ群
21a,21b,21c センサ
22,32 鍋検知手段
23,33 指令手段
24,34 制御手段
40 交流電源
41,51 ダイオードブリッジ
42,52 チョークコイル
43,53 平滑コンデンサ
44,45,54,55 スイッチング素子
46,56,66,76,86 インバータ
47,57,87 スナバコンデンサ
48,58,88 ドライブ回路
49,59,89 直流電源
71a,71b,71c,71aa,71ab,71ei 共振コンデンサ
72a,72b,72c,72aa,72ab,72ei 共振回路
73aa,73ab,73ei 補助回路
81a,81b,81c,81aa,81ab,81ei 切替回路
91,92,93,94 被加熱物
101,102,103,104,105 グループ
Claims (7)
- 被加熱物を載置するための天板と、
前記天板の下方に配置され、第1および第2の加熱コイルを含む複数の加熱コイルと、
第1および第2のインバータを含み、前記加熱コイルに電力を供給する複数のインバータと、
前記加熱コイルをいずれかのインバータに接続するように、又は、いずれのインバータにも接続しないように、前記加熱コイルの電路を切り替える複数の切替回路と、
前記インバータによる電力供給、および、前記切替回路の切り替えを制御する指令手段と、
前記インバータによる電力供給に対する、前記加熱コイルを含む共振回路の反応を検知するセンサと、
前記センサの出力に応じて前記加熱コイルに前記被加熱物が載置されるか否かを検知する鍋検知手段と、
を備え、
前記インバータの数は、前記加熱コイルの数より少なく、
少なくとも前記第1および第2の加熱コイルが、前記第1のインバータと電路を構成する場合において、前記鍋検知手段が、前記第1の加熱コイルには前記被加熱物が載置され、前記第2の加熱コイルには前記被加熱物が載置されていないことを検知したとき、前記指令手段は、前記第1の加熱コイルまたは前記第2の加熱コイルが前記第1のインバータに接続されないように、前記切替回路を切り替える誘導加熱装置。 - 前記指令手段は、前記第1の加熱コイルが前記第1のインバータと電路を構成し、前記第2の加熱コイルが前記第2のインバータと電路を構成するように、前記切替回路を切り替える請求項1に記載の誘導加熱装置。
- 前記鍋検知手段が、隣り合う二つ以上の加熱コイルに単一の被加熱物が載置されたと判断した場合、前記指令手段は、前記隣り合う二つ以上の加熱コイルが前記第1のインバータと電路を構成するように前記切替回路を切り替える請求項1に記載の誘導加熱装置。
- 前記指令手段は、隣り合う二つ以上の加熱コイルに前記第1のインバータから供給される電力が所定値を超える場合、前記隣り合う二つ以上の加熱コイルのうちの少なくとも一つの加熱コイルが前記第2のインバータと電路を構成するように前記切替回路を切り替える請求項3に記載の誘導加熱装置。
- 前記指令手段は、すべてのインバータを動作させる場合、前記被加熱物が載置されない加熱コイルがいずれのインバータとも電路を構成しないように、前記切替回路を切り替える請求項1に記載の誘導加熱装置。
- 誘導加熱電流は供給できないが、鍋検知電流は供給できる補助回路をさらに備え、前記指令手段は、前記被加熱物が載置されない加熱コイルが前記補助回路と電路を構成するように前記切替回路を切り替える請求項5に記載の誘導加熱装置。
- 前記指令手段に加熱開始および加熱停止を指示するための操作部をさらに備え、前記指令手段は、前記操作部からの加熱開始の指示に応答して、前記切替回路の切り替えを行う請求項1に記載の誘導加熱装置。
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CN201480014859.6A CN105191494B (zh) | 2013-04-10 | 2014-04-04 | 感应加热装置 |
JP2015511099A JP6413094B2 (ja) | 2013-04-10 | 2014-04-04 | 誘導加熱装置 |
US14/771,701 US20160029439A1 (en) | 2013-04-10 | 2014-04-04 | Induction heater |
DE112014001914.3T DE112014001914T5 (de) | 2013-04-10 | 2014-04-04 | Induktionsheizer |
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JP (1) | JP6413094B2 (ja) |
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US20160029439A1 (en) | 2016-01-28 |
JPWO2014167814A1 (ja) | 2017-02-16 |
DE112014001914T5 (de) | 2016-01-07 |
CN105191494B (zh) | 2018-04-10 |
CN105191494A (zh) | 2015-12-23 |
JP6413094B2 (ja) | 2018-10-31 |
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