JP2014045546A - Non-contact power-receiving device and non-contact power reception/supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power-receiving device and a non-contact power reception/supply system capable of supplying the power with a high efficiency regardless the coil configuration at the power supply side.SOLUTION: The non-contact power-receiving device includes: plural power receiving coils to which the power is supplied by utilizing the electromagnetic induction in a non-contact manner; and a load circuit to which the power is input from the plural power receiving coils. The plural power receiving coils are connected to each other so that the current flows in an identical direction on the plural power receiving coils.

Description

  The present disclosure relates to a non-contact power receiving apparatus to which electric power is supplied in an electrically non-contact state, and a non-contact power receiving and feeding system including the non-contact power receiving apparatus and the non-contact power feeding apparatus. In particular, the present invention relates to a non-contact power receiving apparatus and a non-contact power receiving system that use an induction heating device as a non-contact power feeding apparatus.

  As a conventional non-contact power receiving apparatus, for example, there is a cordless device disclosed in Patent Document 1. The cordless device of Patent Document 1 relates to a cordless device that drives a rotary cooking device such as a coffee grinder mounted on a top plate of a magnetic generator (induction heating cooker) that is an induction heating device. The cordless device includes a magnetism generating unit having a primary coil and a load unit such as a rotary cooking device having a secondary coil magnetically coupled to the primary coil. In the cordless device disclosed in Patent Document 1, a load unit is placed on a top plate of a magnetism generation unit, and a high frequency current is supplied to the primary coil. It is the structure by which electric power is supplied to a part.

JP-A-5-184471

  In the cordless device disclosed in Patent Document 1 described above, the coil on the power receiving side and the coil on the power feeding side can be used as an induction heating cooker by placing them in a one-to-one correspondence, and placed on the induction heating cooker. The cordless power can be supplied to the contactless power receiving device. On the other hand, as a coil configuration on the power feeding side, various induction heating cookers having a multi-coil configuration in which one object to be heated is induction-heated by a plurality of heating coils under the top plate have been proposed. Even in the induction heating cooker having such a multi-coil configuration, a configuration capable of supplying power to the non-contact power receiving apparatus is required.

However, when power is supplied to a conventional non-contact power receiving device using an induction heating cooker having a multi-coil configuration, the power receiving side coil efficiently receives high-frequency magnetic fields from a plurality of power supply side coils. The problem is that sufficient power cannot be supplied to the non-contact power receiving apparatus.
In addition, in an induction heating cooker having a multi-coil configuration, it is also possible to supply power by matching the outer diameter of the power receiving coil with the outer diameter of the power receiving coil in order to arrange the power receiving side and power feeding side coils in a one-to-one correspondence relationship. However, the multi-coil configuration of the power supply coil has a problem that the power supply efficiency is deteriorated or the power that can be supplied is limited because the outer diameter of the coil is smaller than that of the single coil configuration.

  Therefore, the present disclosure provides a non-contact power receiving apparatus and a non-contact power receiving and feeding system that can perform highly efficient power feeding and receiving regardless of the coil configuration on the power feeding side.

The non-contact power receiving device in the present disclosure is
A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input,
The plurality of power receiving coils are connected such that currents of the plurality of power receiving coils flow in the same direction.

The contactless power supply and reception system in the present disclosure is:
A non-contact power receiving device and a non-contact power feeding device;
The non-contact power receiving device is:
A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input;
A position transmission unit having a function of transmitting a center position of the plurality of power receiving coils,
The plurality of power receiving coils are connected such that currents of the plurality of power receiving coils flow in the same direction,
The non-contact power feeding device is:
A top plate on which the non-contact power receiving device is placed;
A feeding coil disposed below the top plate;
An inverter for supplying power to the feeding coil;
A control unit for controlling the output of the inverter;
A position detecting unit that detects the position of the position transmitting unit and detects the center position of the plurality of power receiving coils.

  The above-described general and specific aspect may be realized by any combination of a non-contact power receiving apparatus and a non-contact power receiving and feeding system.

  According to the non-contact power receiving device in the present disclosure, by using a plurality of coils on the power receiving side and causing the directions of currents flowing in the respective coils to flow in the same direction, high efficiency can be achieved regardless of the coil configuration on the power feeding side. Can receive power.

It is a top view showing a schematic structure of a non-contact power receiving device of Embodiment 1 concerning this indication. 1 is a side view illustrating a schematic configuration of a non-contact power receiving device according to a first embodiment. FIG. 3 is a schematic plan view illustrating a case where the non-contact power receiving device of Embodiment 1 is placed on a non-contact power feeding device having one power feeding coil. FIG. 3 is a schematic side view illustrating a case where the non-contact power receiving device of Embodiment 1 is placed on a non-contact power feeding device having one power feeding coil. FIG. 3 is a schematic plan view illustrating a case where the non-contact power receiving device of Embodiment 1 is placed on a non-contact power feeding device having a plurality of power feeding coils. FIG. 3 is a schematic side view illustrating a case where the non-contact power receiving device of Embodiment 1 is placed on a non-contact power feeding device having a plurality of power feeding coils. FIG. 3 is a schematic plan view illustrating the case where the non-contact power receiving device according to the first embodiment is placed on a non-contact power feeding device having a magnetic shield. It is a schematic side view which illustrates the case where the non-contact power receiving device of Embodiment 1 is placed on a non-contact power feeding device having a magnetic shield. It is a schematic plan view which illustrates the case where the non-contact power receiving device of Embodiment 2 according to the present disclosure is placed on a non-contact power feeding device having one power feeding coil. It is a schematic side view which illustrates the case where the non-contact power receiving device of Embodiment 2 is placed on a non-contact power feeding device having one power feeding coil. It is a schematic plan view which shows the non-contact power supply / reception system of Embodiment 3 which concerns on this indication. FIG. 6 is a schematic side view showing a non-contact power supply / reception system of a third embodiment.

(Background to obtaining one form according to the present disclosure)
As described above, the conventional non-contact power receiving apparatus has a problem that power cannot be efficiently supplied depending on the coil configuration on the power feeding side. Specifically, as in the cordless device disclosed in Patent Document 1, sufficient power supply cannot be performed unless the coil configuration on the power receiving side and the power feeding side have a one-to-one correspondence. The inventors of the present invention have a multi-coil configuration including a plurality of power receiving coils as a coil configuration on the power receiving side, and a plurality of power receiving coils are connected in series and arranged in a ring shape, and the direction of current flowing through each power receiving coil is determined. It has been found that it is possible to perform power supply / reception with high efficiency by configuring it to flow in the same direction, leading to the present invention.

The contactless power receiving device of the first aspect according to the present disclosure is:
A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input,
The plurality of power receiving coils are connected such that currents of the plurality of power receiving coils flow in the same direction.

  In the non-contact power receiving device according to the second aspect of the present disclosure, the plurality of power receiving coils in the first aspect are arranged in a ring on the power receiving coil surface to which power is supplied, and are arranged in parallel. They are arranged symmetrically with respect to the center of the coil surface.

  In the non-contact power receiving device according to the third aspect of the present disclosure, position transmission provided on the central axis of the power receiving surface in the second aspect and having a function of transmitting the center positions of the plurality of power receiving coils. Department.

  In the non-contact power receiving device according to the fourth aspect of the present disclosure, depending on the feeding coil surface of the power feeding coil in the non-contact power feeding device that supplies power to the non-contact power receiving device according to the first to third aspects. The power receiving coil surface of the plurality of power receiving coils may be set.

In the non-contact power receiving and feeding system of the fifth aspect according to the present disclosure,
A contactless power receiving and feeding system comprising a contactless power receiving device and a contactless power feeding device,
The non-contact power receiving device is:
A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input;
A position transmission unit having a function of transmitting a center position of the plurality of power receiving coils,
The plurality of power receiving coils are connected such that currents of the plurality of power receiving coils flow in the same direction,
The non-contact power feeding device is:
A top plate on which the non-contact power receiving device is placed;
A feeding coil disposed below the top plate;
An inverter for supplying power to the feeding coil;
A control unit for controlling the output of the inverter;
A position detection unit that detects a position of the position transmission unit and detects a center position of the plurality of power receiving coils.

In the contactless power receiving and feeding system according to the sixth aspect of the present disclosure, the contactless power receiving apparatus according to the fifth aspect includes a power receiving coil surface that is placed on the contactless power feeding apparatus and to which power is supplied. Have
The plurality of power receiving coils are annularly arranged on the power receiving coil surface and arranged in parallel, and are disposed symmetrically with respect to the center of the power receiving coil surface.

In the non-contact power receiving and feeding system according to the seventh aspect of the present disclosure, the non-contact power receiving apparatus according to the sixth aspect includes an annular magnetic shielding portion having a magnetic shielding function around a power feeding coil that supplies a high-frequency magnetic field. Has been placed,
The power receiving coil surface of the plurality of power receiving coils is configured to be disposed inside the magnetic shield portion.

  In the non-contact power supply and reception system according to the eighth aspect of the present disclosure, the position transmission unit in the fifth to seventh aspects is configured by a magnet, and the position detection unit is configured by a Hall element.

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

(Embodiment 1)
A non-contact power receiving apparatus according to the first embodiment of the present disclosure will be described with reference to FIGS. FIG. 1 is a plan view illustrating a schematic configuration of the contactless power receiving device according to the first embodiment of the present disclosure. FIG. 2 is a side view illustrating a schematic configuration of the non-contact power receiving device according to the first embodiment.

  As shown in FIGS. 1 and 2, the non-contact power receiving device 10 according to the first embodiment includes a plurality of power receiving coils 2 and a load circuit 4. Examples of the load circuit 4 include a rotating device such as a motor, a driving circuit that drives the rotating device, a control circuit that controls the driving circuit, and the like. The plurality of power receiving coils 2 are arranged in a ring and arranged in parallel, and are connected so that the directions of the currents flowing through them are the same. For example, as shown in FIG. 1, by electrically connecting a plurality of power receiving coils 2 in series, at the time shown in FIG. 2, the currents of all the power receiving coils 2 are in a clockwise direction (reference numerals in FIG. 2). In the direction indicated by 3). In the non-contact power receiving device 10 in the first embodiment, four coils are illustrated as the plurality of power receiving coils 2, but the number of power receiving coils 2 is not limited to four, What is necessary is just the structure which consists of a coil. In addition, it is preferable to arrange | position the receiving coil surface comprised by the several receiving coil 2 so that the feeding coil 5 (feeding coil surface) of the non-contact electric power feeder 20 may be opposed. Therefore, the number of coils on the power receiving coil surface constituted by the plurality of power receiving coils 2 is preferably arranged so as to face the same number of coils in the opposing region on the power feeding coil surface of the power feeding coil 5. Here, the power receiving coil surface is a surface facing the power feeding coil 5 in the plurality of power receiving coils 2, and refers to the lower surface of the plurality of power receiving coils 2. The area of the power receiving coil surface is the sum of the areas of the power feeding coil surfaces facing the power feeding coils 5 in the plurality of power receiving coils 2.

  As shown in FIG. 2, the plurality of power receiving coils 2 are disposed below the non-contact power receiving device 10 and connected to the load circuit 4. In the non-contact power receiving device 10, when a plurality of power receiving coils 2 receive power from the power supply coil 5 of the non-contact power feeding device which is an induction heating device under the influence of a high frequency magnetic field, the power is supplied to the load circuit 4. It has become.

  Hereinafter, in Embodiment 1, in order for the non-contact power supply device to electrically supply power to the non-contact power receiving device 10 in a non-contact state, the non-contact power receiving device 10 is changed to the non-contact power supply device 20a that is an induction heating device. The case where it is placed will be described as an example. In particular, a case will be described in which the non-contact power receiving device 10 having the four power receiving coils 2 is mounted on the non-contact power feeding device 20a having the single power feeding coil 5.

  FIG. 3 is a schematic plan view illustrating a case where the non-contact power receiving device 10 according to the first embodiment is mounted on the non-contact power feeding device 20a having one power supply coil 5. FIG. 4 is a schematic side view of a non-contact power supply / reception system exemplifying a case where the non-contact power reception device 10 according to the first embodiment is placed on a non-contact power supply device 20 a having one power supply coil 5.

  As shown in FIGS. 3 and 4, the non-contact power feeding device 20 a that is an induction heating device on which the non-contact power receiving device 10 is placed includes one power feeding coil 5, an inverter 6, and a top plate 7. Although not shown, the contactless power supply device 20a outputs a control signal for controlling the output of the inverter 6 and a command signal for starting or stopping power supply to the control unit in accordance with a user operation. A circuit necessary for a general induction heating apparatus such as an operation unit is provided. In the non-contact power supply device 20a, the power supply coil 5 is excited by the output of the inverter 6 to generate the high frequency magnetic field 8. In the power receiving coil 2 of the non-contact power receiving device 10 placed on the non-contact power feeding device 20a, the generated magnetic flux due to the high frequency magnetic field 8 is linked and a current flows to receive power.

  As shown in FIG. 3, in the non-contact power receiving device 10 of the first embodiment, the plurality of power receiving coils 2 are electrically connected in series, for example, so that currents flowing through the respective power receiving coils 2 flow in the same direction. It becomes the composition. For this reason, when the power receiving coil 2 of the non-contact power receiving apparatus 10 is receiving power, for example, at the time shown in FIG. 3, as indicated by reference numeral 3, the current flowing through all the power receiving coils 2 flows in the clockwise direction. ing. In the non-contact power receiving apparatus 10, a plurality of power receiving coils 2 are arranged in parallel in a ring shape (loop shape) on the power receiving coil surface to which power is supplied. Further, the plurality of power receiving coils 2 are arranged symmetrically with respect to the center of the power receiving coil surface, and are electrically connected in series at four positions on the power receiving coil surface in the non-contact power receiving device 10. . In each of the power receiving coils 2, a surface (power receiving coil surface) facing the power feeding coil 5 is arranged side by side so as to be substantially the same plane, and is arranged in an annular shape along the coil shape of the power feeding coil 5. Therefore, the power receiving coil surface is disposed immediately above the power feeding coil surface of the power feeding coil 5, and the non-contact power feeding device 20a performs a power feeding operation on the non-contact power receiving device 10.

  In the non-contact power receiving apparatus 10 of the first embodiment configured as described above, the direction of the current flowing through the plurality of power receiving coils 2 is set to the same direction, so that the high frequency generated by the power feeding coil 5 as shown in FIG. Receiving the magnetic field 8, it is possible to receive power with high efficiency. Therefore, even if the non-contact power receiving device 10 of the first embodiment has a configuration having a plurality of power receiving coils 2, the power can be supplied with high efficiency similarly to the non-contact power receiving device having one power receiving coil as in the conventional configuration. The power can be received.

Note that if each of the plurality of power receiving coils does not have the same current flowing direction, the magnetic fields generated by the currents flowing through the power receiving coils cancel each other out, so that the power cannot be received with high efficiency. In addition, when the non-contact power receiving device is not configured as in the first embodiment as described above, the plurality of power receiving coils cannot efficiently receive the influence of the high frequency magnetic field from the power feeding coil. There is a problem that electric power cannot be generated. However, in the non-contact power receiving device 10 according to the first embodiment, each of the plurality of power receiving coils 2 (power receiving coil surface) is disposed to face the power feeding coil 5 (power feeding coil surface), and the plurality of power receiving coils are connected in series. Since they are connected so that current flows in the same direction, the power can be received with high efficiency.
Further, in the non-contact power receiving device 10 of the first embodiment, the power receiving coils 2 are connected in series. However, if the current flowing through each power receiving coil 2 flows in the same direction, a plurality of power receiving coils 2 are connected in parallel. You may connect to. However, when a plurality of power receiving coils 2 are connected in parallel, the inductance is lowered, so that each power receiving coil 2 has, for example, the shape and number of turns of the power feeding coil 5 so that the power receiving coil 2 can receive sufficient power from the power feeding coil 5. It is necessary to have the same configuration as the arrangement.

Next, a case where a non-contact power receiving device is placed on a non-contact power feeding device having a plurality of power feeding coils to receive power will be described.
FIG. 5 is a schematic plan view illustrating a case where the non-contact power receiving device 10 according to the first embodiment is mounted on a non-contact power feeding device having a plurality of power feeding coils 5. FIG. 6 is a schematic side view of a non-contact power supply / reception system illustrating the case where the non-contact power reception device 10 according to the first embodiment is mounted on a non-contact power supply device having a plurality of power supply coils 5.

  As shown in FIGS. 5 and 6, the non-contact power feeding device 20 b has a multi-coil configuration having a plurality of power feeding coils 5. Other configurations are the same as those of the non-contact power feeding device 20a having the one power feeding coil 5 shown in FIG. When electric power is supplied from the inverter 6 of the non-contact power supply device 20 b to the plurality of power supply coils 5, the plurality of power supply coils 5 generate a high frequency magnetic field 8. In each of the power receiving coils 2 of the non-contact power receiving device 10 mounted on the non-contact power feeding device 20b, a magnetic flux is linked by the generated high frequency magnetic field 8, and a current flows to receive power. In particular, the contactless power receiving device 10 according to the first embodiment has a multi-coil configuration on the power receiving side with respect to the multi-coil configuration on the power feeding side, and the coils on the power receiving side and the power feeding side are approximately 1: 1. It is comprised so that it may oppose. Accordingly, the magnetic flux generated by the high-frequency magnetic field 8 is linked between the coils, and power is supplied to the power receiving coils 2. As a result, the non-contact power feeding device 20b can efficiently supply power to the non-contact power receiving device 10.

  As described above, the contactless power receiving device 10 according to the first embodiment has a multi-coil configuration including a plurality of power receiving coils 2 on the power receiving side, and a current flowing through the power receiving coil 2 by connecting the plurality of power receiving coils 2 in series. By setting the direction to the same direction, power can be received with high efficiency regardless of the coil configuration on the power feeding side.

Note that in the non-contact power receiving apparatus 10, the plurality of power receiving coils 2 are preferably arranged symmetrically with respect to the center of the power receiving coil surface serving as a mounting surface of the non-contact power receiving apparatus 10. For example, when the non-contact power receiving device 10 is mounted on the non-contact power feeding device 20 a having one power feeding coil 5, the plurality of power receiving coils 2 are power receiving coils of the non-contact power receiving device 10 as shown in FIG. 3. When it is arranged opposite to the feeding coil 5 at a position symmetrical with respect to the center of the surface, the magnetic coupling between the receiving coil 2 and the feeding coil 5 is in an optimum state.
Further, when the non-contact power feeding device 20b has a multi-coil configuration, it is preferable that each of the four power receiving coils 2 and the four power feeding coils 5 be arranged to face each other as shown in FIG. With the configuration, the magnetic coupling between each power receiving coil 2 and the power feeding coil 5 is in an optimum state.

  As described above, the arrangement of the plurality of power receiving coils 2 in the non-contact power receiving device 10 is arranged symmetrically with respect to the center of the power receiving coil surface (mounting surface) of the non-contact power receiving device 10. It is possible to place the magnetic coupling with the power receiving coil 2 at an optimal position, and the power feeding efficiency can be increased.

Next, the case where a non-contact power receiving device is placed on a non-contact power feeding device having a magnetic shielding portion having a magnetic shielding function arranged around the power feeding coil will be described.
FIG. 7 is a schematic plan view illustrating a case where the non-contact power receiving device 10 according to the first embodiment is placed on a non-contact power feeding device having a magnetic shield. FIG. 8 is a schematic side view of a non-contact power supply / reception system illustrating the case where the non-contact power reception device 10 of Embodiment 1 is placed on a non-contact power supply device having a magnetic shield.

  As shown in FIGS. 7 and 8, the non-contact power feeding device 20 c is provided with a ring-shaped magnetic shield 9 on the lower surface of the top plate 7. The magnetic shield 9 is arranged on the outer periphery of the power supply coil 5 and has a ring shape made of a material having low magnetic permeability and resistance such as aluminum. The magnetic-shielding part 9 has a magnetic-shield function which erases the magnetic field which leaks outside from the feed coil 5 using the reverse magnetic field which generate | occur | produces itself. The other configuration of the non-contact power supply device 20c is the same as that of the non-contact power supply device 20a shown in FIG. When the non-contact power receiving device 10 according to the first embodiment is placed on the non-contact power feeding device 20c configured as described above to receive and supply power, the configuration is made up of a plurality of power receiving coils 2 as shown in FIG. It is preferable to design the receiving coil surface to be inside the inner diameter of the ring-shaped magnetic shield 9. When even a part of the power receiving coil 2 is disposed outside the inner diameter of the magnetic shield 9, the power receiving coil 2 disposed outside the inner diameter of the magnetic shield 9 is less susceptible to the high frequency magnetic field 8 by the magnetic shield 9. . As a result, the power receiving coil 2 has less magnetic flux linkage due to the high frequency magnetic field 8 generated by the power feeding coil 5 and cannot receive sufficient power. Therefore, the arrangement configuration of the plurality of power receiving coils 2 is set so that the power receiving coils 2 are arranged inside the inner diameter of the magnetic shield 9. Further, the coil diameter of the power receiving coil 2 may be adjusted so that the power receiving coil 2 is inside the inner diameter of the magnetic shield 9.

In addition, the non-contact electric power feeder 20 in Embodiment 1 is a structure which can be used also as an induction heating apparatus while supplying electric power to the non-contact electric power receiver 10. In this case, since the power feeding coil 5 of the non-contact power feeding device (induction heating device) 20 is also used as a heating coil, the coil diameter of the power feeding coil (heating coil) 5 is a load (for example, a pan or the like) that is induction heated. ) Is constrained to about φ150 to 200 mm.
In the non-contact power feeding device (induction heating device) 20, the power feeding coil (heating coil) 5 has a configuration in which power is supplied by a single coil having the above-described coil diameter. There are a multi-coil configuration in which power is supplied simultaneously from about four small diameter coils. In the contactless power receiving device 10 according to the first embodiment, the configuration of the power receiving coil 2 is desirably a configuration that can efficiently supply power regardless of whether the power supply side coil has a single configuration or a multi-coil configuration. As a configuration for that purpose, the non-contact power receiving apparatus 10 of the first embodiment particularly includes the power receiving coil 2 by a plurality of (for example, four) coils.
Furthermore, it is possible to increase the number of coils by configuring the plurality of power receiving coils 2 with small diameter coils. However, if the coil diameter of the power receiving coil 2 is too small, sufficient magnetic coupling with the load can be obtained. It becomes impossible to supply power efficiently. For this reason, the coil diameters of the plurality of power receiving coils 2 are preferably set to such an extent that sufficient magnetic coupling with the load can be obtained.

  As described above, when the non-contact power feeding device 20 c on the power feeding side includes the magnetic shield unit 9, the plurality of power receiving coils 2 in the non-contact power receiving device 10 on the power receiving side are positioned inside the inner diameter of the magnetic shield unit 9. The arrangement configuration of the plurality of power receiving coils 2 is set. Thereby, even if the non-contact electric power feeder 20c has the magnetic-shielding part 9, the several receiving coil 2 can receive electric power efficiently.

(Embodiment 2)
Next, the non-contact power receiving device according to the second embodiment according to the present disclosure will be described.
The non-contact power receiving device of the second embodiment is different from the non-contact power receiving device 10 of the first embodiment in that the number of power receiving coils 2 is two. Other configurations are the same as those of the contactless power receiving device 10 of the first embodiment.
FIG. 9 is a schematic plan view illustrating the case where the non-contact power receiving device according to the second embodiment of the present disclosure is placed on the non-contact power feeding device 20a having one power feeding coil 5. FIG. 10 is a schematic side view of a non-contact power supply / reception system exemplifying a case where the non-contact power reception apparatus of the second embodiment is mounted on a non-contact power supply apparatus 20 a having one power supply coil 5.

  As shown in FIGS. 9 and 10, in order for the non-contact power supply device 20a to electrically supply power to the non-contact power reception device 10a in a non-contact state, the non-contact power reception device 10a is provided on the non-contact power supply device 20a. Placed. The non-contact power feeding device 20a shown in FIGS. 9 and 10 has a single power feeding coil. Also in the second embodiment, as in the first embodiment, the feeding coil 5 is excited by the output of the inverter 6 to generate the high-frequency magnetic field 8. In the plurality of power receiving coils 2a of the non-contact power receiving device 10a mounted on the non-contact power feeding device 20a, the magnetic flux generated by the generated high-frequency magnetic field 8 is linked and a current flows to receive power.

  As shown in FIG. 9, the non-contact power receiving apparatus 10a according to the second embodiment also has a plurality of power receiving coils 2a electrically connected in series as in the first embodiment. Therefore, when the power receiving coil 2a is affected by the high frequency magnetic field 8 by the power feeding coil 5 of the non-contact power feeding device 20a, for example, at the time shown in FIG. Current flows. Therefore, as in the first embodiment, the non-contact power receiving device 10a according to the second embodiment has a configuration that can efficiently receive power from the power feeding coil 5 even when there are two power receiving coils 2a. . Note that the non-contact power receiving device 10a of the second embodiment is a multi-coil configuration in which the non-contact power feeding device 20a is composed of a plurality of power feeding coils 5 similarly to the non-contact power receiving device 10 of the first embodiment. It is the structure which can receive electric power efficiently.

  Further, as shown in FIG. 9, in the non-contact power receiving device 10a of the second embodiment, the shape of the power receiving coil 2a is changed to that of the first embodiment in order to efficiently receive the high-frequency magnetic field 8 from the non-contact power feeding device. Compared to the power receiving coil 2 of the power receiving device 10, the configuration is enlarged to be elliptical. This is because when the high-frequency magnetic field 8 from the power supply coil 5 is configured to link the magnetic flux with a plurality of power reception coils, the power reception coil surface (the surface facing the power reception coil) is opposed to the power reception coil surface (the surface facing the power supply coil). This is because efficient power reception is not possible if the area occupied by the surface is small. For example, when receiving two coils, such as the power receiving coil 2a of the non-contact power receiving device 10a according to the second embodiment, the same size as the power receiving coil 2 of the non-contact power receiving device 10 according to the first embodiment Is used, the area occupied by the power receiving coil surface is reduced with respect to the power feeding coil surface by the amount of the reduced number of coils. Thus, when the area occupied by the power receiving coil surface of the plurality of power receiving coils 2 a is small with respect to the power feeding coil surface of the power feeding coil 5, the power receiving coil 2 a is affected by the high frequency magnetic field 8 from the power feeding coil 5. The receiving area becomes small and sufficient power cannot be received. Therefore, it is preferable that the power receiving coil surface of the power receiving coil 2 a is configured to occupy as much as possible with respect to the power feeding coil surface of the power feeding coil 5. For example, like the power receiving coil 2a of the non-contact power receiving apparatus 10a according to the second embodiment, the shape of the coil is enlarged to an elliptical shape, and the power receiving coil surface is enlarged in accordance with the power feeding coil surface. However, if the power receiving coil surface of the power receiving coil 2a is made too large, the device size of the non-contact power receiving device 10a itself becomes large, which makes it unusable for the user. Therefore, it is preferable that the power receiving coil surface of the power receiving coil 2a is appropriately set with respect to the power feeding coil surface of the power feeding coil 5 within a range in which the device does not become too large according to the device specifications and the like.

  As described above, in the non-contact power receiving device 10a of the second embodiment, even when there are two power receiving coils 2a, highly efficient power reception is performed regardless of the coil configuration of the non-contact power feeding device on the power feeding side. It becomes possible.

  Further, the power receiving coil surface of the power receiving coil 2a in the non-contact power receiving device 10a is appropriately set according to the power feeding coil surface in the power feeding coil 5 of the non-contact power feeding device, so that the magnetic flux due to the high frequency magnetic field 8 from the power feeding coil 5 is generated. It is possible to increase power reception efficiency by interlinking with high efficiency. When the power receiving efficiency is compared between the case where there are two power receiving coils and the case where there are four power receiving coils, in the case where there are two power receiving coils, the region where the magnetic flux interlinks is reduced by the amount of distortion of the coil. The power receiving efficiency becomes lower.

(Embodiment 3)
Next, the non-contact power supply / reception system according to the third embodiment of the present disclosure will be described.
FIG. 11 is a schematic plan view showing the non-contact power supply / reception system according to the third embodiment of the present disclosure. FIG. 12 is a schematic side view showing the non-contact power supply / reception system of the third embodiment.

  As illustrated in FIGS. 11 and 12, the non-contact power receiving and feeding system 30 according to the third embodiment includes a non-contact power receiving device 10 b and a non-contact power feeding device 20 d. The non-contact power receiving apparatus 10b is provided with a position transmission unit 11 having a position transmission function in the non-contact power receiving apparatus 10 of the first embodiment. The position transmission unit 11 is arranged so as to be surrounded by a plurality of power receiving coils 2 arranged in an annular shape, and is provided at the center of four power receiving coils 2 connected in series and provided in four directions.

  The non-contact power supply device 20d is configured such that one power supply coil 5 is disposed below the top plate 7, and the power supply coil 5 is connected to the inverter 6 to supply desired high-frequency power. The non-contact power feeding device 20 d in the non-contact power feeding and feeding system 30 according to the third embodiment is provided with a position detection unit 12 having a position detection function at the center of the power feeding coil 5.

  The non-contact power supply / reception system 30 according to the third embodiment is configured such that the position detection unit 12 detects the facing position transmission unit 11 when the non-contact power reception device 10b is placed on the non-contact power supply device 20d. . As shown in FIG. 12, when the non-contact power receiving device 10 b is placed on the non-contact power feeding device 20 d, the non-contact power receiving device 10 b is placed at a position where the position transmitting unit 11 is detected by the position detecting unit 12. As a result, the center of the power receiving coil surface constituted by the plurality of power receiving coils 2 in the non-contact power receiving device 10b and the center of the power feeding coil surface constituted by the power feeding coil 5 in the non-contact power feeding device 20d are aligned. Will be. At this time, the magnetic coupling between the power feeding coil 5 on the power feeding side and the power receiving coil 2 on the power receiving side is optimal, and power is supplied with high power receiving efficiency. In the non-contact power supply / reception system 30 according to the third embodiment, the non-contact power supply device 20d has been described as having a single power supply coil. However, the non-contact power supply device 20d has a multi-coil configuration including a plurality of coils. Even if it exists, the same effect can be show | played by arrange | positioning the position transmission part 11 and the position detection part 12 in the position where magnetic coupling becomes the optimal as mentioned above.

  For example, a magnet can be used as the position transmission unit 11 in the non-contact power supply / reception system 30 of the third embodiment. On the other hand, as the position detection unit 12, for example, a Hall element can be used. By configuring in this way, when the position detection unit 12 detects the magnetic field of the magnet that is the position detection unit 11, for example, by notifying the user by light, sound, display, etc., the non-contact power receiving device 10b can be easily placed at an optimum position on the non-contact power feeding device 20d.

  As described above, in the non-contact power supply / reception system 30 according to the third embodiment, the position transmission unit 11 is used on the non-contact power reception device 10b side, and the position detection unit 12 is used on the non-contact power supply device 20d side. As a result, the user can easily place the non-contact power receiving device 10b at an optimal position on the non-contact power feeding device 20d, and can perform appropriate and efficient power supply.

2, 2a Power receiving coil 3 Current flow direction 4 Load circuit 5 Power feeding coil 6 Inverter 7 Top plate 8 High frequency magnetic field 9 Magnetic shield 10, 10a, 10b Non-contact power receiving device 11 Position transmitting unit 12 Position detecting unit 20, 20a, 20b, 20c, 20d Contactless power feeding device 30 Contactless power feeding and feeding system

Claims (8)

A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input,
The plurality of power receiving coils are non-contact power receiving devices connected so that currents of the plurality of power receiving coils flow in the same direction.   2. The non-contact power receiving according to claim 1, wherein the plurality of power receiving coils are annularly arranged in parallel on a power receiving coil surface to which power is supplied, and are arranged symmetrically with respect to a center of the power receiving coil surface. apparatus.   The non-contact power receiving apparatus according to claim 2, further comprising a position transmission unit that is provided on a central axis of the power receiving surface and has a function of transmitting center positions of the plurality of power receiving coils.   The power receiving coil surface of the plurality of power receiving coils is set according to any one of claims 1 to 3, according to a power feeding coil surface of the power feeding coil in the contactless power feeding device that supplies power to the contactless power receiving device. The non-contact power receiving device described. A contactless power receiving and feeding system comprising a contactless power receiving device and a contactless power feeding device,
The non-contact power receiving device is:
A plurality of receiving coils to which electric power is supplied contactlessly using electromagnetic induction;
A load circuit to which power from the plurality of power receiving coils is input;
A position transmission unit having a function of transmitting a center position of the plurality of power receiving coils,
The plurality of power receiving coils are connected such that currents of the plurality of power receiving coils flow in the same direction,
The non-contact power feeding device is:
A top plate on which the non-contact power receiving device is placed;
A feeding coil disposed below the top plate;
An inverter for supplying power to the feeding coil;
A control unit for controlling the output of the inverter;
A non-contact power feeding and receiving system comprising: a position detecting unit that detects a position of the position transmitting unit and detects a center position of the plurality of power receiving coils. The non-contact power receiving device has a power receiving coil surface that is mounted on the non-contact power feeding device and is supplied with power,
The non-contact power receiving and feeding system according to claim 5, wherein the plurality of power receiving coils are arranged in a ring shape on the power receiving coil surface, and are arranged in parallel with respect to a center of the power receiving coil surface. In the non-contact power receiving device, an annular magnetic shielding portion having a magnetic shielding function is disposed around a power supply coil that supplies a high-frequency magnetic field,
The non-contact power feeding and receiving system according to claim 6, wherein the power receiving coil surface by the plurality of power receiving coils is arranged inside the magnetic shield portion.   The non-contact power feeding and receiving system according to claim 5, wherein the position transmission unit is configured by a magnet, and the position detection unit is configured by a Hall element.

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