WO2015137431A1

WO2015137431A1 - Power receiving coil structure and wireless power feeding system

Info

Publication number: WO2015137431A1
Application number: PCT/JP2015/057249
Authority: WO
Inventors: 吉田史生
Original assignee: 株式会社村田製作所
Priority date: 2014-03-14
Filing date: 2015-03-12
Publication date: 2015-09-17
Also published as: JPWO2015137431A1; JP6206578B2

Abstract

A power receiving coil structure receives power from a power feeding device provided with a plurality of power feeding conductor patterns extending in a Y-axis direction in an XYZ orthogonal coordinate system, comprises a first loop-shaped conductor (21) and a second loop-shaped conductor (22) which are formed on an XY plane such that an electric current is induced by linkage of magnetic flux in a Z-axis direction therewith, and have a right-left asymmetric shape when an X-axis direction is defined as a right-left direction, and is provided with a resonance circuit in which inductance which the first loop-shaped conductor (21) and the second loop-shaped conductor (22) have is used as the inductance of an LC resonance circuit.

Description

Power receiving coil structure and wireless power feeding system

The present invention relates to a power receiving coil structure and a wireless power feeding system for receiving power wirelessly from a power feeding device.

In recent years, the short-range wireless communication system has expanded, and the situation where various devices are used independently by wireless is increasing. Along with this, a technology for wirelessly feeding power at a short distance is also drawing attention.

As a document related to a short-range wireless communication system, Patent Document 1 discloses a wireless IC tag using a loop antenna structure and a folded planar antenna. Further, Patent Document 2 discloses a wireless communication antenna that is devised so as to eliminate the incommunicable region regardless of the posture of the communication target.

On the other hand, as a literature on short-distance power supply, a configuration of a power transmission system that makes it easy to align a power transmission unit of a power transmission device and a power reception unit of a power reception device by arranging a plurality of coils that are partly stacked one after another is patented It is shown in Reference 3.

JP 2006-180043 A JP 2005-223402 A International Publication No. 2013/054399 Pamphlet

The basic configuration of a wireless power feeding system that performs wireless power feeding by magnetic field coupling is to provide loop conductors on both the power feeding device side and the power receiving device side so that magnetic flux can escape from each other. It is something that comes close. However, when the positional relationship between the power transmission unit of the power transmission device and the power reception unit of the power reception device is fixed, wireless power feeding can be performed by magnetic field coupling with a certain coupling coefficient. If it is necessary to supply power even if the position of the power reception unit varies, the loop conductor of the power transmission unit is made larger than the loop conductor of the power reception unit. In addition, if the loop conductor of the power transmission unit does not have a simple loop shape, and the loop conductor has a plurality of conductive patterns distributed within the power supply range, the magnetic field strength within the loop conductor formation range of the power transmission unit Distribution can be made uniform.

However, in the power supply range, out of the magnetic flux generated from the loop-shaped conductor of the power transmission unit, the magnetic flux interlinked with the loop-shaped conductor of the power receiving unit can be offset, so that power is not supplied in the power supply range. A position arises. This problem cannot be solved by the structures shown in Patent Documents 1 to 3.

An object of the present invention is to provide a power receiving coil structure and a wireless power feeding system that enable stable power feeding over a wide range even when the position of the power receiving unit is displaced within the power feeding range.

(1) A power receiving coil structure of the present invention is a power receiving coil structure that receives power from a power feeding device including a plurality of power feeding conductor patterns extending in a Y-axis direction in an XYZ orthogonal coordinate system,
It has a first loop conductor and a second loop conductor that are formed on the XY plane so that the magnetic flux in the Z-axis direction is linked and the current is induced, and are arranged so as to be asymmetric with respect to the Y-axis. And
A resonance circuit having an inductance of the LC resonance circuit as an inductance of the first loop conductor and the second loop conductor is provided.

With the above configuration, among the magnetic fluxes linked to the first loop-shaped conductor and the second loop-shaped conductor, there is often a case where one is in a canceling state and the other is not in a canceling state. The probability of becoming very small becomes possible, and stable power feeding is possible regardless of the position of the power receiving unit within the power feeding range.

(2) The first loop-shaped conductor has a substantially rectangular shape in which the Y-axis is a long side direction and the X-axis is a short-side direction, and the second loop-shaped conductor is a long-side direction and a Y-axis. Is a substantially rectangular shape with a short side direction,
The first loop-shaped conductor and the second loop-shaped conductor are formed such that one long side and the other short side, and one short side and the other long side are along each other, and the current flowing through the conductors along each other It is preferable that they are arranged in the same direction. With this configuration, a power receiving coil structure having a large substantial loop area (coil opening area) can be configured.

(3) It is preferable that the first loop-shaped conductor and the second loop-shaped conductor are formed by bending a single conducting wire and connected in series. With this configuration, the connection of the conductive wires has a simple structure and the number of parts does not increase, so that downsizing is facilitated.

(4) The first loop-shaped conductor and the second loop-shaped conductor are provided with two groups, a first group and a second group, and the first group and the second group are point-symmetric in plan view from the Z-axis direction. It is preferable that the outer shape is rectangular. With this configuration, a power receiving coil structure having a large loop area (coil opening area) can be configured with a limited occupation area.

(5) A right-angled triangular loop-shaped third conductor having a base extending in the X-axis direction and a height extending in the Y-axis direction, and a base extending in the X-axis direction. And a right triangle formed by the fourth loop conductor and a hypotenuse of the right triangle formed by the third loop conductor and the right loop formed by the fourth loop conductor. Parallel to the oblique side of the triangle, the third loop-shaped conductor and the fourth loop-shaped conductor form a square shape, and the third loop-shaped conductor and the fourth loop-shaped conductor are each of the mutual currents flowing in the oblique side. It is preferable that they are arranged in the same direction.

With the above configuration, the long and short sides of the first loop conductor and the second loop conductor are inclined with respect to the XY axis with respect to a plurality of power supply conductor patterns extending in the Y axis direction. Even when the power receiving coil structure is arranged and the induced currents by the first loop conductor and the second loop conductor are zero, induced currents by the third loop conductor and the fourth loop conductor are generated. That is, the occurrence of a canceling position with respect to the rotation direction of the power receiving coil structure can be eliminated.

(6) In the resonance circuit, an inductance and a first capacitor included in the first loop-shaped conductor and the second loop-shaped conductor constitute a first resonance circuit, and the third loop-shaped conductor and the fourth loop-shaped It is preferable that the second resonance circuit is constituted by the inductance of the conductor and the second capacitor. With this configuration, energy can be efficiently extracted without canceling out currents induced in the first to fourth loop conductors.

(7) It is preferable to include a first rectifying / smoothing circuit that rectifies and smoothes AC power received by the first resonance circuit, and a second rectifying and smoothing circuit that rectifies and smoothes AC power received by the second resonance circuit. . Thereby, the energy induced by the first loop-shaped conductor and the second loop-shaped conductor and the energy induced by the third loop-shaped conductor and the fourth loop-shaped conductor are efficiently extracted without canceling each other.

(8) The wireless power feeding system of the present invention includes a wireless power feeding device that feeds power wirelessly, and a power receiving device that receives the power by magnetic coupling with the wireless power feeding device,
The power receiving device includes the power receiving coil structure according to any one of (1) to (7),
The power supply device includes a plurality of power supply conductor patterns extending in a first direction of an XY plane in an XYZ orthogonal coordinate system and arranged in a second direction orthogonal to the first direction.

With the above configuration, stable power feeding is possible regardless of the position of the power receiving unit within the power feeding range of the wireless power feeding device.

(9) In the above (8), it is preferable that the plurality of power supply conductor patterns have a meander shape, and the interval between the parallel conductors is larger than the line width of the conductor. With this configuration, the gap between adjacent conductor patterns becomes relatively wide, the substantial opening range through which the magnetic flux passes is widened, and the coupling coefficient with the loop-shaped conductor of the power receiving device is increased.

(10) In (9) above, when the lengths of the long side portions of the first loop-shaped conductor and the second loop-shaped conductor are represented by t and the interval between the feeding conductor patterns is represented by w.
w ≦ t <2w
It is preferable that the relationship is With this structure, there is less condition for the position where the power feeding unit and the power receiving unit are not coupled within the power feeding range, and stable power feeding is possible.

According to the present invention, stable wireless power feeding is possible regardless of the position of the power receiving unit within the power feeding range of the power feeding device.

FIG. 1 is a configuration diagram of a power receiving coil structure according to the first embodiment. 2A and 2B are views showing the power receiving coil structure 201 divided into two elements. FIG. 3 is a circuit diagram of the power receiving coil structure 201 and the power receiving circuit 40. FIG. 4 is a configuration diagram of the wireless power feeding apparatus. FIG. 5 is a diagram showing the configuration of the inverter circuit 13. FIGS. 6A and 6B are plan views showing the connection between a part of the meander-shaped portion of the loop-shaped conductor 11 of the wireless power feeder and the coil structure for receiving power. FIG. 7 is a configuration diagram of another wireless power supply apparatus applicable to the first embodiment. FIG. 8 is a configuration diagram of the power receiving coil structure 202 according to the second embodiment. FIG. 9 is a circuit diagram of the power receiving coil structure 202 and the power receiving circuit 40. FIG. 10 is an exploded view of the power receiving coil structure according to the third embodiment. FIG. 11 is a configuration diagram of a power receiving coil structure 203 according to the third embodiment. FIG. 12 is a circuit diagram of the power receiving coil structure 203 and the power receiving circuit 40 of the third embodiment. FIGS. 13A and 13B are reference plan views illustrating the coupling between a part of the meander-shaped portion of the loop-shaped conductor 11 of the wireless power feeding apparatus and the coil structure for receiving power. FIG. 14 is a configuration diagram of a gradient power receiving coil structure 210 provided in the power receiving coil structure of the fourth embodiment. FIG. 15 is a configuration diagram of a power receiving coil structure 204 according to the fourth embodiment. FIG. 16 is a circuit diagram of the power receiving coil structure 204 and the power receiving circuit 40 of the fourth embodiment. FIG. 17A and FIG. 17B are diagrams illustrating the operation of the gradient power receiving coil structure 210. FIG. 18 is a view showing a modification of the power receiving coil structure according to the fourth embodiment, and shows a configuration of the power receiving coil structure according to the fourth embodiment in a circuit diagram. FIGS. 19A, 19B, and 19C show the size of the space between the power supply loop conductor 11 and the loop conductor of the power receiving coil structure 204 according to the fifth embodiment. It is a figure which shows the relationship. FIG. 20 is a configuration diagram of a power receiving coil structure according to the sixth embodiment. FIG. 21 is a configuration diagram of another power receiving coil structure according to the sixth embodiment. 22A and 22B are configuration diagrams of still another power receiving coil structure according to the sixth embodiment.

Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. Each embodiment is an exemplification, and needless to say, partial replacement or combination of configurations shown in different embodiments is possible.

<< First Embodiment >>
FIG. 1 is a configuration diagram of a power receiving coil structure according to the first embodiment. The power receiving coil structure 201 is a power receiving coil structure that receives power from a power feeding device including a plurality of power feeding conductor patterns extending in the Y-axis direction in an XYZ orthogonal coordinate system. The power supply conductor pattern will be described later.

The power receiving coil structure 201 includes a first loop conductor 21 and a second loop conductor 22. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 are formed on the XY plane so that a magnetic flux in the Z-axis direction is linked to induce a current. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 have an asymmetric shape when the X-axis direction is the left-right direction.

The first loop conductor 21 and the second loop conductor 22 are connected in series. The capacitor 31 is connected to this series circuit, and an LC resonance circuit is formed that resonates with the inductance of the first loop conductor 21 and the second loop conductor 22 and the capacitance of the capacitor 31.

The first loop conductor 21 has a substantially rectangular shape with the Y axis as the long side direction and the X axis as the short side direction, and the second loop conductor 22 has the X axis as the long side direction and the Y axis as the short side. The direction is a substantially rectangular shape.

The first loop-shaped conductor 21 and the second loop-shaped conductor 22 have one long side and the other short side, and one short side and the other long side along each other, and the current flowing through the conductors along each other. One long side and the other short side, and one short side and the other long side overlap each other so that the directions are the same.

In the example shown in FIG. 1, the first loop-shaped conductor 21 and the second loop-shaped conductor 22 are formed by bending a single conducting wire and connected in series. The first loop conductor 21 and the second loop conductor 22 may be provided by forming a conductor pattern on the substrate.

FIGS. 2A and 2B show the power receiving coil structure 201 divided into two elements. The first loop conductor 21 and the capacitor 31 constitute a resonance circuit, and the second loop conductor 22 and the capacitor 31 constitute a resonance circuit. However, actually, the capacitor 31 and the power receiving circuit 40 are each single.

FIG. 3 is a circuit diagram of the power receiving coil structure 201 and the power receiving circuit 40. An LC resonance circuit is configured by the series circuit of the first loop-shaped conductor 21 and the second loop-shaped conductor 22 and the capacitor 31. The resonance voltage of the resonance circuit is rectified and smoothed by the diode D and the capacitor C1, is made constant by the regulator circuit REG and the capacitor C2, and is supplied to the load.

FIG. 4 is a configuration diagram of the wireless power feeding apparatus. The wireless power supply apparatus 101 is an apparatus that supplies power to a power receiving apparatus located in a spatially separated place via a magnetic field. The wireless power feeder 101 includes a substrate 10 made of an insulator on which a loop conductor 11 for power feeding is formed. The loop-shaped conductor 11 includes a meander-shaped portion composed of a combination of a long path portion 11L extending in the Y-axis direction and a short path portion 11S extending in the X-axis direction.

The loop conductor 11 has an inductance, and an LC resonance circuit that resonates with this inductance and the capacitance of the capacitor 12 is configured. The inverter circuit 13 receives the DC voltage of the DC power supply 9 and supplies a high-frequency current having a frequency equal to the resonance frequency of the LC resonance circuit. Thereby, a magnetic field is generated by the current flowing through the loop-shaped conductor 11. The wireless power feeding apparatus 101 and the power receiving coil structure 201 constitute a wireless power feeding system.

FIG. 5 is a diagram showing a configuration of the inverter circuit 13. Here, a circuit of the entire wireless power feeder is shown. The inverter circuit 13 includes a high-side switch Q1, a low-side switch Q2, and a controller / driver circuit that controls on / off of these. The controller / driver circuit alternately turns on / off the high-side switch Q1 and the low-side switch Q2 at the resonance frequency of the LC resonance circuit. This constitutes a resonant inverter circuit.

6 (A) and 6 (B) are plan views showing the connection between a part of the meander-shaped portion of the loop-shaped conductor 11 of the wireless power feeder and the coil structure for receiving power. 6A and 6B, only the shapes of the first loop-shaped conductor 21 and the second loop-shaped conductor 22 are shown for the coil structure 201 for power reception.

6A and 6B, the cross symbol and the dot symbol represent the direction of the magnetic field generated by the current flowing through the feeding loop conductor 11. When the power receiving coil structure 201 is in the position shown in FIG. 6A, the magnetic flux generated by the long path portion 11L passes in both directions in the coil opening formed by the second loop conductor 22 of the power receiving coil structure 201. . Therefore, the second loop conductor 22 is not coupled to the feeding loop conductor 11. However, the magnetic flux by the long path portion 11L passes in one direction through the coil opening formed by the first loop conductor 21 of the power receiving coil structure 201. Therefore, the power receiving coil structure 201 is coupled to the power feeding loop conductor 11 by the coupling of the first loop conductor 21 and the long path portion 11L.

When the power receiving coil structure 201 is in the position shown in FIG. 6B, the magnetic flux by the long path portion 11L passes in both directions in the coil opening formed by the first loop conductor 21 of the power receiving coil structure 201. . Therefore, the first loop conductor 21 is not coupled to the feeding loop conductor 11. However, the magnetic flux by the two long path portions 11L passes through the coil opening formed by the second loop-shaped conductor 22 of the power receiving coil structure 201. The magnetic flux passing through the coil opening formed by the second loop conductor 22 is unbalanced. For this reason, the power receiving coil structure 201 is coupled to the power feeding loop conductor 11 by coupling the second loop conductor 22 and the long path portion 11L.

In this way, in the XYZ orthogonal coordinate system, the power receiving coil structure 201 that receives power from a power feeding device including a plurality of power feeding conductor patterns extending in the Y axis direction can be located at any position in the X axis direction. The power can be received by rectifying and smoothing the current induced in one or both of the first loop-shaped conductor 21 and the second loop-shaped conductor 22.

FIG. 7 is another configuration diagram of the wireless power feeder. The wireless power feeding apparatus is not limited to the configuration illustrated in FIG. 4. For example, as illustrated in FIG. 7, each of the plurality of power feeding loop conductors 11 a to 11 e may form one closed loop. In the example shown in FIG. 7, capacitors 12a to 12e are connected to a plurality of power feeding loop conductors 11a to 11e to form an LC resonance circuit, and the switching power supply circuit 14 is connected to each of the power feeding loop conductors 11a to 11e. A high frequency current having a frequency equal to the resonance frequency of the LC resonance circuit is supplied to 11e.

<< Second Embodiment >>
FIG. 8 is a configuration diagram of the power receiving coil structure 202 according to the second embodiment. The power receiving coil structure 202 includes a first loop conductor 21 and a second loop conductor 22. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 are formed on the XY plane so that a magnetic flux in the Z-axis direction is linked to induce a current.

The first loop conductor 21 and the second loop conductor 22 share a part of each and are connected in parallel. A capacitor 31 is connected to the parallel circuit, and an LC resonance circuit is configured that resonates with the inductance of the first loop conductor 21 and the second loop conductor 22 and the capacitance of the capacitor 31.

FIG. 9 is a circuit diagram of the power receiving coil structure 202 and the power receiving circuit 40. An LC resonance circuit is configured by the parallel circuit of the first loop-shaped conductor 21 and the second loop-shaped conductor 22 and the capacitor 31. The resonance voltage of the resonance circuit is rectified and smoothed by the diode D and the capacitor C1, is made constant by the regulator circuit REG and the capacitor C2, and is supplied to the load.

Thus, the first loop conductor 21 and the second loop conductor 22 may share a part of each. In addition, the first loop conductor 21 and the second loop conductor 22 may be connected in parallel as described above.

<< Third Embodiment >>
FIG. 10 is an exploded view of the power receiving coil structure according to the third embodiment. The power receiving coil structure of the present embodiment is composed of a first power receiving coil structure 201A and a second power receiving coil structure 201B. Each of the first power receiving coil structure 201 </ b> A and the second power receiving coil structure 201 </ b> B includes a first loop conductor 21 and a second loop conductor 22.

FIG. 11 is a configuration diagram of the power receiving coil structure 203 of the present embodiment. The power receiving coil structure 203 has a first power receiving coil structure 201A and a second power receiving coil structure 201B that are point-symmetrically overlapped in a plan view from the Z-axis direction, and have a rectangular outer shape. With this configuration, a rectangular region can be effectively used, and a power receiving coil structure having a large substantial loop area (coil opening area) can be configured with a limited occupation area.

FIG. 12 is a circuit diagram of the power receiving coil structure 203 and the power receiving circuit 40 of the present embodiment. Two sets of resonance circuits of the series circuit of the first loop-shaped conductor 21 and the second loop-shaped conductor 22 and the capacitor 31 are configured. The resonance voltage of the resonance circuit is rectified and smoothed by the diodes Da and Db and the capacitor C1, is made constant by the regulator circuit REG and the capacitor C2, and is supplied to the load. Thus, two sets of LC resonance circuits may be provided.

<< Fourth Embodiment >>
FIGS. 13A and 13B are plan views for reference showing a connection between a part of the meander-shaped portion of the loop-shaped conductor 11 of the wireless power feeding apparatus and the coil structure for receiving power. In FIGS. 13A and 13B, a power receiving coil structure 201 is the power receiving coil structure shown in the first embodiment. Unlike the example shown in FIG. 6, the power receiving coil structure 201 rotates to the right by 135 °.

13A and 13B, the cross symbol and the dot symbol represent the direction of the magnetic field generated by the current flowing through the feeding loop conductor 11. When the power receiving coil structure 201 is at the position shown in FIG. 13A, the magnetic flux between the two adjacent long path portions 11L causes the coil opening and the first loop conductor 21 of the power receiving coil structure 201 to It passes through most of the coil opening of the two-loop conductor 22. Therefore, the power receiving coil structure 201 is coupled to the power feeding loop conductor 11. On the other hand, when the power receiving coil structure 201 is in the position shown in FIG. 13B, the coil opening and the second loop of the first loop conductor 21 of the power receiving coil structure 201 are arranged on the left and right sides of one long path portion 11L. The coil openings of the conductor 22 are positioned symmetrically. Therefore, the power receiving coil structure 201 is not coupled to the power feeding loop conductor 11.

This embodiment is an example of a power receiving coil structure that can receive power even when the direction of the power receiving coil structure is inclined with respect to the X-axis direction or the Y-axis direction.

FIG. 14 is a configuration diagram of a gradient power receiving coil structure 210 provided in the power receiving coil structure of the present embodiment. The inclined power receiving coil structure 210 includes a third loop conductor 23 and a fourth loop conductor 24.

The third loop-shaped conductor 23 has a right-angled triangular shape in which the linear portion extending in the X-axis direction is the bottom and the linear portion extending in the Y-axis direction is the height. Similarly, the fourth loop-shaped conductor 24 has a right triangle shape in which the linear portion extending in the X-axis direction is the base and the linear portion extending in the Y-axis direction is the height. And the hypotenuse of the right triangle formed by the third loop conductor 23 and the hypotenuse of the right triangle formed by the fourth loop conductor 24 are parallel, and the third loop conductor 23 and the fourth loop conductor 24 are The outer shape forms a square shape.

The third loop conductor 23 and the fourth loop conductor 24 are connected in series so that the directions of the currents flowing in the oblique sides are the same. The arrow in FIG. 14 shows an example of the current direction at a certain moment.

A second capacitor 32 is connected to a series circuit of the third loop conductor 23 and the fourth loop conductor 24. A second resonance circuit is configured by the inductance of the third loop conductor 23 and the fourth loop conductor 24 and the second capacitor 32.

FIG. 15 is a configuration diagram of the power receiving coil structure 204 according to the fourth embodiment. The power receiving coil structure 204 is obtained by stacking the gradient power receiving coil structure 210 shown in FIG. 14 on the power receiving coil structure 203 shown in FIG. 11 in the third embodiment. A right triangle formed by the third loop-like conductor 23 and the fourth loop-like conductor 24 of the inclined power receiving coil structure 210 in a state where the power receiving

coil structures

201A and 201B are inclined by 45 ° with respect to the X-axis direction. Is the Y-axis direction.

FIG. 16 is a circuit diagram of the power receiving coil structure 204 and the power receiving circuit 40 of the present embodiment. In this power receiving coil structure 204, the first resonance circuit is constituted by the first capacitor 31A and the inductance of the first loop conductor and the second loop conductor, and the second loop conductor and the second loop conductor. The first resonance circuit is constituted by the inductance of the conductor and the first capacitor 31B, and the second resonance circuit is constituted by the inductance of the third loop-shaped conductor and the fourth loop-shaped conductor and the second capacitor 32. It is configured. The resonance voltages of these three resonance circuits are rectified and smoothed by the diodes D1A, D1B, D2 and the capacitor C1, are made constant voltage by the regulator circuit REG and the capacitor C2, and are supplied to the load. Here, the diodes D1A and D1B and the capacitor C1 are examples of the “first rectification smoothing circuit” according to the present invention, and the diode D2 and the capacitor C1 are examples of the “second rectification smoothing circuit” according to the present invention.

17 (A) and 17 (B) are diagrams illustrating the operation of the gradient power receiving coil structure 210. FIG. 17A and 17B, the cross symbol and the dot symbol represent the direction of the magnetic field generated by the current flowing through the power feeding loop conductor 11. When the inclined power receiving coil structure 210 is in the position shown in FIG. 17A, the magnetic flux generated around one long path portion 11L causes the coil opening of the third loop conductor 23 of the inclined power receiving coil structure 210 and Currents induced in the third loop conductor 23 and the fourth loop conductor 24 through the coil opening of the fourth loop conductor 24 are added. Therefore, the gradient power receiving coil structure 210 is coupled to the power feeding loop conductor 11. On the other hand, when the power receiving coil structure 201 is at the position shown in FIG. 17B, the magnetic flux between the two adjacent long path portions 11L is caused by the coil opening of the third loop conductor 23 and the fourth loop conductor 24. Through most of the coil opening. However, the current induced in the third loop conductor 23 and the fourth loop conductor 24 is subtracted. Therefore, the inclined power receiving coil structure 210 is not coupled to the power feeding loop conductor 11. However, when the power receiving coil structure 204 is located at the position shown in FIG. 17B, the power receiving

coil structures

201A and 201B are coupled to the power feeding loop conductor 11.

Therefore, the power receiving coil structure 204 of the present embodiment is tilted by 45 °, and at any position in the X-axis direction, one of the power receiving

coil structures

201A and 201B or the gradient power receiving coil structure 210 is placed. Alternatively, power can be received by rectifying and smoothing the current induced in both.

FIG. 18 is a diagram showing a modification of the power receiving coil structure according to the present embodiment, and shows the configuration in a circuit diagram. In the examples shown in FIGS. 10 and 12, the power receiving

coil structures

201A and 201B are configured by a series circuit of the first loop-shaped conductor 21 and the second loop-shaped conductor 22, but as shown in FIG. You may comprise with a parallel circuit.

<< Fifth Embodiment >>
FIGS. 19A, 19B, and 19C are diagrams showing the relationship in size between the lines of the feeding loop-like conductor 11 and the loop-like conductor of the power receiving coil structure 204. FIG. The power receiving coil structure 204 is the power receiving coil structure shown in the fourth embodiment. In FIGS. 19A, 19B, and 19C, w is the distance between the long path portions 11L of the power supply loop conductor 11, and t is the width of the power reception loop conductor of the power receiving coil structure 204. 19A is an example of t = w, FIG. 19B is an example of t <w, and FIG. 19C is an example of t = 2w. In the relationship of FIG. 19A, the coupling coefficient is highest when the two long path portions 11L overlap with two sides of the power receiving loop conductor of the power receiving coil structure. In the relationship of FIG. 19C, the magnetic flux interlinking with the opening of the power receiving loop-shaped conductor of the power receiving coil structure has the same positive and negative amounts regardless of where the power receiving coil structure 204 is in the X-axis direction. Thus, the coupling coefficient becomes zero. The same applies to t> 2w. In the case of the relationship of FIG. 19B, the coupling coefficient is smaller than that of FIG. Therefore, what is necessary is just to define the space | interval of the long path | route part 11L of a meander shape part by the relationship of w <= t <2w.

<< Sixth Embodiment >>
In the sixth embodiment, several modifications of the first to fourth loop conductors shown in the above embodiments will be described.

FIG. 20 is a configuration diagram of a power receiving coil structure according to the sixth embodiment. The power receiving coil structure 206 </ b> A includes a first loop conductor 21 and a second loop conductor 22. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 are formed on the XY plane so that a magnetic flux in the Z-axis direction is linked to induce a current. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 have an asymmetric shape when the X-axis direction is the left-right direction.

The first loop-shaped conductor 21 has a trapezoidal shape in which the linear portion extending in the Y-axis direction has an upper base and a lower base, and the height in the X-axis direction. Further, the second loop-shaped conductor 22 has a trapezoidal shape in which the linear portion extending in the X-axis direction has an upper base and a lower base, and the height in the Y-axis direction. Thus, the first loop conductor 21 and the second loop conductor 22 do not necessarily have to be rectangular.

FIG. 21 is a configuration diagram of another power receiving coil structure according to the sixth embodiment. The power receiving coil structure 206 </ b> B includes a first loop conductor 21 and a second loop conductor 22. The first loop-shaped conductor 21 and the second loop-shaped conductor 22 have an asymmetric shape when the X-axis direction is the left-right direction.

The first loop conductor 21 is long in the Y-axis direction, and the second loop conductor 22 is long in the X-axis direction. Each of them has an oval shape or a rectangular shape with rounded corners and sides. Thus, the first loop conductor 21 and the second loop conductor 22 do not necessarily have to be rectangular. Moreover, you may have roundness.

FIGS. 22A and 22B are configuration diagrams of still another power receiving coil structure according to the sixth embodiment. In FIG. 1 and the like, the first loop-shaped conductor and the second loop-shaped conductor are rectangular. However, as shown in the power receiving coil structure 206C in FIG. On the other hand, a power receiving coil structure having a circular shape as a whole may be configured by overlapping another point receiving symmetrical coil structure. In addition, in the inclined power receiving coil structure 210 shown in FIG. 14, an example in which the right loop triangular third loop conductor 23 and the fourth loop conductor 24 are provided is shown. However, the power receiving coil shown in FIG. As shown in the structure 210C, each may be semicircular.

In addition, in the gradient power receiving

coil structures

210 and 210C shown in FIGS. 14 and 22, the third loop conductor 23 and the fourth loop conductor 24 are connected in series, but they may be connected in parallel.

C1, C2 ... Capacitors D, D1A, D1B, D2 ... Diodes Da, Db ... Diode Q1 ... High-side switch Q2 ... Low-side switch REG ... Regulator circuit 9 ... DC power supply 10 ... Substrate 11 ... Feeding loop conductor 11L ... Long path Part 11S ... Short path part 12 ... Capacitor 13 ... Inverter circuit 21 ... First loop conductor 22 ... Second loop conductor 23 ... Third loop conductor 24 ... Fourth loop conductor 31 ...

Capacitors

31A, 31B ... First Capacitor 32 ... Second capacitor 40 ... Power receiving circuit 101 ... Wireless

power supply apparatus

201, 201A, 201B ... Power receiving coil structure 202 to 204 ... Power receiving

coil structure

206A, 206B, 206C ... Power receiving

coil structure

210, 210C ... Coil structure for inclined power reception

Claims

In the XYZ orthogonal coordinate system, a power receiving coil structure that receives power from a power feeding device including a plurality of power feeding conductor patterns extending in the Y-axis direction,
It has a first loop conductor and a second loop conductor that are formed on the XY plane so that the magnetic flux in the Z-axis direction is linked and the current is induced, and are arranged so as to be asymmetric with respect to the Y-axis. And
A power receiving coil structure including a resonance circuit that uses an inductance of the first loop-shaped conductor and the second loop-shaped conductor as an inductance of an LC resonance circuit.
The first loop conductor has a substantially rectangular shape with the Y axis as the long side direction and the X axis as the short side direction, and the second loop conductor has the X axis as the long side direction and the Y axis as the short side. The direction is a substantially rectangular shape,
The first loop-shaped conductor and the second loop-shaped conductor are formed such that one long side and the other short side, and one short side and the other long side are along each other, and the current flowing through the conductors along each other The power receiving coil structure according to claim 1, wherein the power receiving coil structure is disposed so as to have the same direction.
The power receiving coil structure according to claim 2, wherein the first loop-shaped conductor and the second loop-shaped conductor are formed by bending a single conductive wire and connected in series.
The set of the first loop-shaped conductor and the second loop-shaped conductor is provided with two sets of a first set and a second set, and the first set and the second set overlap in a point symmetry in a plan view from the Z-axis direction, The power receiving coil structure according to claim 2 or 3, wherein the outer shape is a quadrangular shape.
A third loop-shaped conductor having a right triangular shape having a linear portion extending in the X-axis direction as a base and a linear portion extending in the Y-axis direction as a height;
A right-angled triangular fourth loop-shaped conductor having a base extending in the X-axis direction and a height extending in the Y-axis direction;
The hypotenuse of the right triangle formed by the third loop conductor and the hypotenuse of the right triangle formed by the fourth loop conductor are parallel to each other, and the third loop conductor and the fourth loop conductor form a quadrangle. And
The power receiving coil structure according to any one of claims 1 to 4, wherein the third loop-shaped conductor and the fourth loop-shaped conductor are arranged so that directions of currents flowing in the oblique sides are the same.
In the resonance circuit, a first resonance circuit is constituted by an inductance and a first capacitor which the first loop conductor and the second loop conductor have, and the third loop conductor and the fourth loop conductor have The power receiving coil structure according to claim 5, wherein the inductance and the second capacitor constitute a second resonance circuit.
A first rectifying and smoothing circuit for rectifying and smoothing AC power received by the first resonant circuit;
A second rectifying / smoothing circuit for rectifying and smoothing the AC power received by the second resonant circuit;
The power receiving coil structure according to claim 6, comprising:
In a wireless power feeding system configured by a wireless power feeding device that feeds power wirelessly and a power receiving device that receives magnetic power by magnetic coupling with the wireless power feeding device,
The power receiving device comprises the power receiving coil structure according to any one of claims 1 to 7,
The power supply apparatus includes a plurality of power supply conductor patterns extending in a first direction of an XY plane in the XYZ orthogonal coordinate system and arranged in a second direction orthogonal to the first direction.
Wireless power supply system.
The wireless power feeding system according to claim 8, wherein the plurality of power feeding conductor patterns have a meander shape, and an interval between conductors parallel to each other is larger than a line width of the conductors.
When the length of the long side portion of the first loop-shaped conductor and the second loop-shaped conductor is represented by t, and the interval between the feeding conductor patterns is represented by w,
w ≦ t <2w
The wireless power feeding system according to claim 9, wherein: