JP2023023341A - Energy supply device - Google Patents

Abstract

To suppress reduction in energy supply efficiency between a plurality of coils in an energy supply device capable of supplying energy to an object in a contactless manner.SOLUTION: An energy supply device 100 capable of supplying energy to an object 200 in a contactless manner includes a top plate 1 on which the object is placed, and a plurality of coils 2 which are connected to a power supply and arranged below the top plate to supply energy to the object. The plurality of coils are of a solenoid type configured by winding a conductive wire around a magnetic core, and the magnetic core is shared between the plurality of adjacent coils.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an energy supply device capable of supplying energy to an object without contact.

Conventionally, an energy supply device is known that supplies energy such as heat and electric power to an object in a non-contact manner using an induced current due to a high-frequency magnetic field. As such an energy supply device, for example, in Patent Document 1, a plurality of circular coils (pancake coils) are arranged in an array under a top plate on which an object to be heated or an object to be fed is placed. A device is disclosed that enables contactless heating and power supply at any position on the surface.

International Publication No. 2014-030314

In an energy supply device in which circular coils are arranged side by side, as shown in Patent Literature 1, the energy supply efficiency between coils is relatively low compared to that directly above the coils. Therefore, in order to efficiently heat and supply power to the object, the user has to precisely adjust the position of the object placed on the tabletop, which is inconvenient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its main object is to suppress a decrease in energy supply efficiency between a plurality of coils in an energy supply device capable of supplying energy to an object in a non-contact manner. is.

That is, an energy supply device according to the present invention is an energy supply device capable of supplying energy to an object in a non-contact manner, and comprises a top plate on which the object is placed, a power supply connected to the top plate and an energy supply under the top plate. and a plurality of coils arranged in each other to supply energy to the object, wherein the plurality of coils are of a solenoid type configured by winding a conductive wire around a magnetic core, and between the plurality of adjacent coils and the magnetic core is shared.

With such a configuration, each coil is of a solenoid type, and the magnetic core is shared between a plurality of adjacent coils. A path can be formed. As a result, a decrease in energy supply efficiency between the coils can be suppressed, and a bias in energy supply efficiency on the top plate can be suppressed. This eliminates the need to strictly adjust the position of the object placed on the top plate, thereby improving user convenience.

Moreover, it is preferable that the plurality of coils are arranged in a two-dimensional array in the energy supply device.
In this way, energy can be supplied to the object over a wide range on the top plate. A user can place an object at a desired position on the top plate to heat or supply power to the object, thereby further improving user convenience.

Further, as a specific embodiment of the energy supply device, a plurality of coils sharing the magnetic core are arranged in rows to form a coil array, and a plurality of rows of the coil arrays can be mentioned. .

As a specific mode of the energy supply device, the plurality of coil arrays may be arranged such that the coils in adjacent rows are alternately arranged.

Further, the energy supply device includes a plurality of inverters that supply high-frequency power to the plurality of coils, and the inverters are individually connected to each of the plurality of coils sharing the magnetic core. is preferred.
Moreover, it is preferable that the energy supply device is configured to be able to individually change directions of magnetic fluxes generated from the plurality of coils by individually changing directions of currents flowing through the plurality of coils.
In this way, the on/off, frequency, phase, applied voltage, etc. of the supply current can be adjusted for each coil. As a result, it is possible to excite only the coil at the position where the object to be heated or the object to be supplied with power is placed, for example, so that economic efficiency and safety can be improved.

Further, as a specific aspect of the energy supply device, in the plurality of coils sharing the magnetic core, the directions of the magnetic fluxes generated from the adjacent coils are opposite to each other, so that the object is heated. It is preferably configured to.

Further, as a specific aspect of the energy supply device, the object includes a load and a secondary side coil connected to the load, and the plurality of coils and the It is configured to transmit electric power to the object by causing magnetic resonance with the secondary coil of the object.

Further, as a specific aspect of the energy supply device, in the plurality of coils sharing the magnetic core, by matching the directions of the magnetic fluxes generated from the mutually adjacent coils, power is supplied to the object. are configured.

According to the present invention configured as described above, in an energy supply device capable of supplying energy to an object in a non-contact manner, it is possible to suppress a decrease in energy supply efficiency between a plurality of coils.

The perspective view which shows roughly the structure of the energy supply apparatus of this embodiment. The top view which shows roughly the structure of the energy supply apparatus of the same embodiment. The exploded view which shows roughly the structure of the coil array of the same embodiment. The figure which shows roughly the circuit structure of the coil array of the same embodiment. The figure which shows roughly the circuit structure of the coil array of the same embodiment. The figure for demonstrating the heating operation of the energy supply apparatus of the same embodiment. The figure for demonstrating the electric power feeding operation|movement of the energy supply apparatus of the same embodiment. The figure for demonstrating the electric power feeding operation|movement of the energy supply apparatus of the same embodiment. The figure which shows roughly the circuit structure of the energy supply apparatus of the same embodiment, and an electric power feeding object. The perspective view which shows roughly the structure of the coil array of other embodiment. The perspective view which shows roughly the structure of the coil array of other embodiment. The perspective view which shows roughly the structure of the coil array of other embodiment.

An energy supply device according to an embodiment of the present invention will be described below with reference to the drawings.

<Device configuration>
The energy supply device 100 of this embodiment supplies energy to an object 200 in a non-contact manner using the principle of electromagnetic induction. The energy supply device 100 is used in a kitchen, for example, to induction-heat metal cooking utensils such as pots and frying pans, and to wirelessly supply power to electric appliances such as electric kettles. It is used as

Specifically, as shown in FIG. 1, this energy supply device 100 is arranged under a top plate 1 on which an object 200 such as cooking utensils and electric appliances is placed, and is arranged under the top plate 1 to apply energy to the object 200. It includes a plurality of coils 2 for supplying power, an inverter 3 for supplying alternating current to the plurality of coils 2 , and a control unit 4 for controlling the inverter 3 . This energy supply device 100 can perform both an induction heating operation for induction heating of cooking utensils and a power supply operation for wirelessly supplying power to electrical equipment, and can selectively switch between these operations by a user's operation. configured to be

The top plate 1 has a plate shape having a flat mounting surface 11 on which the object 200 is placed. The top plate 1 is made of an electrically insulating material such as glass or ceramic.

The plurality of coils 2 function as heating coils during the induction heating operation, and function as power supply coils during the power supply operation. Specifically, the plurality of coils 2 are arranged on the back side of the mounting surface 11 (below the top plate 1), and all of them are connected to a magnetic core 21 (here, an integrated body) made of a magnetic material such as ferrite and a conducting wire 22. It is a solenoid type that is configured by winding the . Here, each coil 2 is configured such that its conducting wire 22 is wound around an axis orthogonal to the mounting surface 11 . That is, each coil 2 is set such that its axis is parallel to the vertical direction. The plurality of coils 2 have the same shape and size, and are arranged in a two-dimensional array in plan view as shown in FIG.

More specifically, in this energy supply device 100, a plurality of (five) coils 2 are arranged in rows at equal intervals to form a set of coil arrays 2A. are arranged parallel to each other in a plurality of rows (six rows). In plan view, each coil array 2A is arranged such that the coils 2 in adjacent rows are alternately arranged.

The energy supply device 100 of this embodiment is configured such that the magnetic core 21 is shared between a plurality of coils 2 adjacent to each other. Specifically, as shown in FIGS. 2 and 3, in each coil array 2A, the magnetic core 21 is shared among the plurality of coils 2 forming a line. That is, a plurality of coils 2 are formed by winding a plurality of conducting wires 22 around one magnetic core 21 at different positions.

More specifically, the magnetic core 21 constituting each coil array 2A has a long plate-like shape extending along the arrangement direction of the coils 2 as shown in FIG. A plurality of wound portions 212 around which the conductor wire 22 is wound are formed on one surface 211 . Each wound part 212 is composed of a convex part protruding toward the top plate 1, and is provided at regular intervals along the arrangement direction.

The inverter 3 is connected to the power supply and the coil 2 , converts the AC voltage supplied from the power supply into an arbitrary frequency, and outputs it to the coil 2 . The energy supply device 100 of this embodiment includes a plurality of inverters 3 corresponding to each of the plurality of coils 2 . More specifically, as shown in FIGS. 4 and 5, at least in each coil array 2A, a plurality of coils 2 are individually connected to corresponding inverters 3, respectively. In this embodiment, the inverters 3 are connected to all the arranged coils 2 in a one-to-one correspondence. A resonance capacitor 5 is connected in series to each coil 2 to form a resonance circuit (LC series resonance circuit).

The control unit 4 is a computer having a CPU, memory, input means, etc., and functions to individually control each inverter 3 by operating according to a predetermined program stored in the memory.

Specifically, the control unit 4 individually controls the operation of each inverter 3 connected to each coil 2 to turn on/off the current flowing to each coil 2, and the frequency (for example, a high frequency of 10 kHz to 100 kHz). frequency band), phase and voltage can be adjusted independently. Further, the control unit 4 is configured to individually change the direction of the magnetic flux generated from each coil 2 by changing the direction of the current flowing through each coil 2 . Furthermore, the control unit 4 is configured to detect the position and size of the object 200 placed on the top plate 1 .

The control unit 4 has two control modes: an induction heating mode for controlling each inverter 3 so as to induction-heat the object 200 placed on the top plate 1; A power feeding mode for controlling the inverter 3 can be taken. Each mode will be explained.

(induction heating mode)
In the induction heating mode, the controller 4 controls each inverter 3 such that the directions of magnetic fluxes generated from adjacent coils 2 are opposite to each other, as shown in FIG. 6(a). More specifically, in each coil array 2A, the directions of currents flowing through adjacent coils 2 are opposite to each other, and the directions of magnetic fluxes generated from these coils 2 are controlled to be opposite to each other. Note that the control unit 4 selectively energizes only the coil 2 positioned directly below the object 200 placed on the top plate 1 . In addition, in this induction heating mode, the control unit 4 controls each inverter 3 so that a high-frequency current of 10 kHz or higher flows through each coil 2 .

In this induction heating mode, as shown in FIG. 6(b), each coil 2 constituting the coil array 2A shares the magnetic core 21. Since a magnetic path is formed through the coils 2, a strong magnetic field can be generated between the coils 2 and the heating area can be widened.

(Power supply mode)
In the power feeding mode, as shown in FIG. 7, the control unit 4 controls each inverter 3 so as to match the direction of the magnetic flux generated from each coil 2 in the coil array 2A. More specifically, in each coil array 2A, each inverter 3 is controlled so that the directions of the currents flowing through the coils 2 are the same, and the directions of the magnetic fluxes generated from these coils 2 are the same. In the power supply mode, each inverter 3 is controlled such that the directions of magnetic fluxes generated from the coils 2 of the adjacent coil arrays 2A are opposite to each other. Note that the control unit 4 selectively energizes only the coil 2 positioned directly below the object 200 placed on the top plate 1 . Also, in this power supply mode, the control unit 4 controls each inverter 3 so that a high-frequency current flows through each coil 2 . Each coil 2 is applied with an AC voltage from the inverter 3 to generate an oscillating magnetic field.

In this power feeding mode, as shown in FIG. 8, each coil 2 constituting each coil array 2A shares the magnetic core 21, so even if the position or size of the power feeding object 200 changes, the driving power can be maintained. By selecting the coil 2 to be used, the optimum magnetic path for power supply can be configured.

The object 200 to which power can be supplied in the power supply mode includes, for example, a load 220 such as a heat transfer heater, and a power receiving unit 210 that receives power transmitted from the energy supply device 100 and outputs it to the load 220. is mentioned. For example, as shown in FIG. 9 , the power receiving unit 210 magnetically resonates with the resonance circuit of the energy supply device 100 to generate an alternating voltage, and a and a voltage conversion circuit 212 that converts an AC voltage into a desired voltage and supplies it to the load 220 . As the secondary side resonance circuit 211, there is an LC series resonance circuit including a secondary side coil 211a and a secondary side resonance capacitor 211b which are connected in series with each other. The energy supply device 100 of the present embodiment has a coil 2 (primary coil 2) under the top plate 1 and a secondary coil provided in the power supply target 200 for the target 200 including the power receiving unit 210. 211a facing each other and causing magnetic resonance at a high frequency resonance frequency, power can be transferred. Moreover, from the viewpoint of facilitating alignment of power supply, the secondary coil 211a is preferably formed to have a circular shape in a plan view.

<Effects of this embodiment>
According to the energy supply system of this embodiment configured as described above, each coil 2 is of the solenoid type, and the magnetic core 21 is shared among the plurality of coils 2 in each coil array 2A. Therefore, when each coil 2 is excited, a magnetic path can be formed between the coils 2 as well. As a result, a decrease in energy supply efficiency between the coils 2 can be suppressed, and unevenness in energy supply efficiency on the top plate 1 can be suppressed. This eliminates the need to strictly adjust the position of the object 200 placed on the top plate 1, thereby improving user convenience.

Moreover, since a plurality of coils 2 are arranged in a two-dimensional array, energy can be supplied to the object 200 over a wide range on the top plate 1 . The user can place the target object 200 at a desired position on the top plate 1 to heat or supply power, thereby further improving user convenience.

<Other Modified Embodiments>
It should be noted that the present invention is not limited to the above embodiments.

For example, in the above-described embodiment, each coil 2 is configured by winding the conducting wire 22 around the magnetic core 21 so that the axis thereof is parallel to the vertical direction, but the present invention is not limited to this. In another embodiment, as shown in FIG. 10, each coil 2 may be constructed by winding a conductor 22 around a magnetic core 21 so that its axis is parallel to the horizontal direction.

Further, in the above-described embodiment, the magnetic core 21 shared by the plurality of coils 2 is made of one piece, but the present invention is not limited to this. In another embodiment, as shown in FIG. 11, the magnetic core 21 shared by the plurality of coils 2 may be configured by connecting a plurality of magnetic blocks each having a T-shaped cross section. .

Further, the coil 2 of another embodiment may use a thin (sheet-like) magnetic core 21 as shown in FIG.

In the above-described embodiment, the shape and size of each coil 2 and the shape and size of each winding are the same, but they may be different. Also, in other embodiments, each coil array 2A may not be arranged such that the coils 2 are staggered. Also, the number of coil arrays 2A arranged under the top plate 1 and the number of coils 2 included in each coil array 2A may be changed as appropriate.

In addition, various modifications and combinations of the embodiments may be made without departing from the gist of the present invention.

100 ... Energy supply device 1 ... Top plate 2 ... Coil 21 ... Magnetic core 3 ... Inverter 4 ... Control unit 200 ... Object

Claims (9)

An energy supply device capable of supplying energy to an object without contact,
a top plate on which the object is placed;
a plurality of coils connected to a power source and positioned under the top plate to energize the object;
The energy supply device according to claim 1, wherein the plurality of coils are of a solenoid type configured by winding a conductive wire around a magnetic core, and the magnetic core is shared between the plurality of adjacent coils. 2. The energy supply device according to claim 1, wherein said plurality of coils are arranged in a two-dimensional array. 3. The energy supply device according to claim 2, wherein a plurality of coils sharing the magnetic core are arranged in rows to form a coil array, and the coil array is provided in a plurality of rows. 4. The energy supply device according to claim 3, wherein the plurality of coil arrays are arranged such that the coils in adjacent rows are staggered. comprising a plurality of inverters that supply high-frequency power to the plurality of coils,
The energy supply device according to any one of claims 1 to 4, wherein the inverter is individually connected to each of the plurality of coils sharing the magnetic core. The energy according to any one of claims 1 to 5, wherein the direction of the magnetic flux generated from the plurality of coils can be individually changed by individually changing the direction of the current flowing in the plurality of coils. feeding device. 7. The object according to claim 6, wherein in the plurality of coils sharing the magnetic core, the object is heated by making the directions of magnetic fluxes generated from the coils adjacent to each other opposite to each other. energy supply. The object comprises a load and a secondary coil connected to the load,
8. The power is transmitted to the object by causing magnetic resonance between the plurality of coils and the secondary coil of the object arranged opposite to the coils. or the energy supply device according to claim 1. A claim citing claim 6, wherein, in the plurality of coils sharing the magnetic core, power is supplied to the object by matching the directions of the magnetic fluxes generated from the coils adjacent to each other. 9. The energy supply device according to 8.

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