JPWO2015163296A1 - Wireless power supply system - Google Patents

Abstract

First conductor (21) where magnetic flux in the Z-axis direction intersects, second conductor (22) where magnetic flux in the X-axis direction intersects, third conductor (23) where magnetic flux in the Y-axis direction intersects, substrate (20), first conductor , A capacitor that forms an LC resonance circuit together with the inductance of the second conductor and the third conductor, and at least part of the first conductor (21) is on the first main surface or the second main surface of the substrate (20). And the second conductor (22) and the third conductor (23) are mounted on the first main surface of the substrate (20) so as to stand up from the first main surface of the substrate (20). Is placed. With such a configuration, power can be received even if the relative posture of the power receiving device with respect to the wireless power feeding device is indefinite.

Description

  The present invention relates to a power receiving antenna that wirelessly receives power from a power feeding device.

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

  Patent Document 1 discloses a configuration of a power transmission system in which a plurality of coils, one part of which is sequentially overlapped, are arranged as a short-distance power supply related document to facilitate alignment between a power feeding unit of a power feeding device and a power receiving unit of a power receiving device. Is shown in

International Publication No. 2013/054399 Pamphlet

  As shown in Patent Document 1, a conventional wireless power feeding apparatus is used with a power feeding coil and a power receiving coil arranged so that coil opening surfaces face each other. Therefore, wireless power feeding cannot be performed in a state where the power feeding coil and the power receiving coil are not opposed to each other, or power transmission efficiency is reduced.

  Further, as shown in Patent Document 1, in a wireless power feeding apparatus that is used in a form in which a power receiving coil faces a power feeding coil, the relative posture of the power receiving apparatus with respect to the wireless power feeding apparatus can be kept constant. It is important to maintain power transmission efficiency.

  On the other hand, it may be desired that power can be received even if the relative posture of the power receiving device with respect to the wireless power feeding device is indefinite.

  An object of the present invention is to provide a power receiving antenna that can receive power even if the relative posture of the power receiving device with respect to the wireless power feeding device is indefinite, and that has a simple coil configuration.

(1) The power receiving antenna of the present invention is
In the XYZ orthogonal coordinate system, a first conductor where the magnetic flux in the Z-axis direction intersects, a second conductor where the magnetic flux in the X-axis direction intersects, a third conductor where the magnetic flux in the Y-axis direction intersects,
A substrate on which a first conductor, a second conductor and a third conductor are provided;
A capacitor constituting an LC resonance circuit together with inductances of the first conductor, the second conductor, and the third conductor;
With
In the power receiving antenna in which the current induced in the first conductor, the second conductor, and the third conductor is extracted from the LC resonance circuit as power,
At least a part of the first conductor is formed along the first main surface or the second main surface of the substrate, and at least a part of the second conductor and the third conductor stands up from the first main surface of the substrate. It is characterized by being placed on the first main surface of the substrate.

(2) The first conductor forms a loop in which magnetic flux in the Z-axis direction is linked, the second conductor forms a loop in which magnetic flux in the X-axis direction is linked, and the third conductor is in the Y-axis direction. A loop in which magnetic fluxes are linked is formed, the first conductor is formed along the first main surface or the second main surface of the substrate, and the second conductor and the third conductor are raised from the first main surface of the substrate. Thus, it is preferably placed on the first main surface of the substrate.

(3) The power receiving antenna of the present invention is
In the XYZ orthogonal coordinate system, a first conductor where the magnetic flux in the Z-axis direction intersects, a second conductor where the magnetic flux in the X-axis direction intersects, a third conductor where the magnetic flux in the Y-axis direction intersects,
A substrate on which a first conductor, a second conductor and a third conductor are provided;
A capacitor constituting an LC resonance circuit together with inductances of the first conductor, the second conductor, and the third conductor;
With
In the power receiving antenna in which the current induced in the first conductor, the second conductor, and the third conductor is extracted from the LC resonance circuit as power,
The first conductor forms a loop in which the magnetic flux in the Z-axis direction is linked, the second conductor forms a loop in which the magnetic flux in the X-axis direction is linked, and the third conductor is linked in the Y-axis direction. Forming a loop,
The substrate has a rectangular plate shape having four sides, and cut portions are formed on the four sides (edges).
The first conductor is formed along the first main surface or the second main surface of the substrate, and the second conductor and the third conductor are held in a cut portion of the substrate.

  In any of the above configurations (1) to (3), stable power feeding is possible even in a posture in which the power receiving antenna faces any three-dimensional direction with respect to the power feeding device. Further, each loop-shaped conductor can be easily mounted and each loop-shaped conductor forming portion is simplified, so that the overall size can be reduced.

(4) When the first conductor, the second conductor, and the third conductor are electrically connected in series, the LC resonance circuit can be unified, the circuit configuration is simplified, and a large number of circuit elements are used. Loss can be reduced.

(5) In the above (4), it is preferable that the first conductor, the second conductor, and the third conductor are formed by bending one conductive wire. 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.

(6) In the above (1) to (4), when there are three capacitors constituting three LC resonance circuits together with the first conductor, the second conductor, and the third conductor, these three LC resonance circuits are substantially It is preferable that the resonance frequencies are equal. With this configuration, the three parallel resonance circuits resonate with the frequency of the high-frequency magnetic field generated from the power supply device, and high-efficiency power reception is possible.

(7) In the above (1) to (4), the first conductor, the second conductor, and the third conductor are connected in parallel, and the parallel circuit and the capacitor constitute a single LC resonance circuit. Also good. With this configuration, the number of parts is reduced.

  ADVANTAGE OF THE INVENTION According to this invention, even if the relative attitude | position of the power receiving apparatus with respect to a wireless power feeder is indefinite, it can receive electric power and can comprise the power receiving antenna which made the structure of the coil part easy.

FIG. 1 is a configuration diagram of a power receiving antenna coil unit 201 that is a main part of the power receiving antenna according to the first embodiment. FIG. 2 is a diagram illustrating a connection relationship between three loop conductors and a power receiving circuit. FIG. 3 is a circuit diagram of the power receiving antenna 211 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. FIG. 6A is a plan view 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 power receiving antenna, and FIG. 6B is a front view of the portion. FIG. 7A is a front view illustrating a relationship between a part of the meander shape portion of the wireless power feeding apparatus and the second loop conductor 22 of the power receiving antenna, and FIG. 7B is a diagram of the meander shape portion of the wireless power feeding device. It is a top view shown about the relationship between a part and the 3rd loop-shaped conductor 23 of a receiving antenna. FIG. 8 is a configuration diagram of a power receiving antenna coil portion that is a main part of the power receiving antenna according to the second embodiment. FIG. 9 is a circuit diagram of a power receiving device including the power receiving antenna 213A and the power receiving circuit 40 according to the third embodiment. FIG. 10 is a circuit diagram of a power receiving apparatus including another power receiving antenna 213B and a power receiving circuit 40 according to the third embodiment. FIG. 11 is a configuration diagram of a power receiving antenna according to the fourth embodiment. FIG. 12 is a circuit diagram of the power receiving antenna 214 and the power receiving circuit 40. FIG. 13 is a configuration diagram of a power receiving antenna coil unit, which is a main part of the power receiving antenna according to the fifth embodiment, to which a power receiving circuit is connected.

  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 antenna coil portion which is a main part of the power receiving antenna according to the first embodiment. The power receiving antenna includes a power receiving antenna coil unit 201 and a capacitor connected thereto. The power receiving antenna receives power wirelessly from the power feeding device. An example of the power supply conductor pattern formed in the power supply apparatus will be described later.

  The power receiving antenna coil unit 201 includes a first loop conductor 21, a second loop conductor 22, a third loop conductor 23, and a substrate 20 on which the loop conductors 21, 22, and 23 are provided. In the XYZ rectangular coordinate system, the first loop conductor 21 has the coil axis facing the Z-axis direction, the second loop conductor 22 has the coil axis facing the X-axis direction, and the third loop conductor 23 has the coil axis Y-axis. Turn to the direction. Therefore, the magnetic flux in the Z-axis direction is linked to the first loop-shaped conductor 21, the magnetic flux in the X-axis direction is linked to the second loop-shaped conductor 22, and the magnetic flux in the Y-axis direction is linked to the third loop-shaped conductor 23. Interact.

  As shown in FIG. 1, the power receiving antenna coil unit 201 exists in a cubic space indicated by a broken line. The loop surface (coil opening surface of the loop coil) of the first loop conductor 21 is formed along the upper surface (first main surface) of the substrate 20. The second loop conductor 22 and the third loop conductor 23 are placed on the upper surface of the substrate 20.

  The first loop conductor 21 is a conductor pattern formed on the substrate 20. The second loop-shaped conductor 22 and the third loop-shaped conductor 23 are formed by bending a conductive wire, and are mounted by soldering end portions of the respective conductive wires to lands on the substrate 20. .

  Note that the loop surface of the first loop conductor 21 may be formed along the lower surface (second main surface) of the substrate 20. The first loop conductor 21 may also be formed by bending a conductive wire in the same manner as the second loop conductor 22 and the third loop conductor 23.

  Here, an example of a one-turn loop conductor has been shown, but a plurality of turns may be used, and the same effect is obtained.

  FIG. 2 is a diagram illustrating a connection relationship between the three loop conductors and the power receiving circuit. The three loop conductors 21, 22, and 23 are connected in parallel, and a capacitor 31 is further connected in parallel to the parallel circuit. Thus, an LC resonance circuit is configured, and this LC resonance circuit is connected to the power receiving circuit 40. The resonance frequency of this LC resonance circuit is set to be the frequency of the high-frequency magnetic field generated from the power feeding device.

  FIG. 3 is a circuit diagram of the power receiving antenna 211 and the power receiving circuit 40. The resonance voltage of the LC resonance circuit by the first loop conductor 21, the second loop conductor 22, the third loop conductor 23 and the capacitor 31 is rectified and smoothed by the diode D and the capacitor C1, and is constant by the regulator circuit REG and the capacitor C2. And supplied to the load.

  The capacitor 31 may be mounted on the substrate 20 shown in FIG. The power receiving circuit 40 may also be provided on the substrate 20 on which the power receiving antenna coil unit 201 is configured.

  The power receiving antenna 211 and the power receiving circuit 40 are provided, for example, in a three-dimensional pointing device. The load shown in FIG. 3 is a circuit of a three-dimensional pointing device, and the power receiving antenna 211 and the power receiving circuit 40 supply a power supply voltage to this circuit.

  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 in a spatially separated place via a magnetic field, and is a pad that supplies power to, for example, a three-dimensional pointing device. 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-shaped 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 antenna 211 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.

  FIG. 6A is a plan view showing the coupling between a part of the meander-shaped portion of the loop-shaped conductor 11 of the wireless power feeding apparatus and the power receiving antenna, and FIG. 6B is a front view of that portion. 6A and 6B, the power receiving antenna 211 represents only the shape of the first loop conductor 21 among the three loop conductors.

  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 antenna 211 is at the position shown in FIG. 6A, the two long path portions 11L enter the coil opening formed by the first loop conductor 21 of the power receiving antenna 211 in a plan view. Therefore, the first loop-shaped conductor 21 is strongly coupled with the magnetic flux generated by the two long path portions 11L.

  FIG. 7A is a front view illustrating a relationship between a part of the meander shape portion of the wireless power feeding apparatus and the second loop conductor 22 of the power receiving antenna, and FIG. 7B is a diagram of the meander shape portion of the wireless power feeding device. It is a top view shown about the relationship between a part and the 3rd loop-shaped conductor 23 of a receiving antenna. When the second loop conductor 22 of the power receiving antenna 211 is located at the position shown in FIG. 7A, the magnetic flux of the power feeding device does not interlink with the second loop conductor 22. Further, when the third loop conductor 23 of the power receiving antenna 211 is located at the position shown in FIG. 7B, the magnetic flux of the power feeding device does not interlink with the third loop conductor 23.

  When the posture of the power receiving antenna coil unit 201 with respect to the wireless power feeding apparatus changes, the coupling relationship between the loop conductor of the wireless power feeding apparatus and the loop conductor of the power receiving antenna changes. For example, when the power receiving antenna coil unit 201 is rotationally displaced about the Y axis from the state shown in FIG. 7A, the magnetic flux of the power feeding device is linked to the second loop conductor 22. Further, from the state shown in FIG. 7B, when the power receiving antenna coil unit 201 is rotationally displaced about the X axis, the magnetic flux of the power feeding device is linked to the third loop conductor 23. Therefore, regardless of the posture of the power receiving antenna coil unit 201 with respect to the wireless power feeding device, the magnetic flux of the power feeding device is linked to two of the three loop conductors 21, 22, and 23.

  In this manner, the power receiving antenna can receive power from the wireless power feeding device regardless of the posture of the power receiving antenna coil unit 201 with respect to the wireless power feeding device.

<< Second Embodiment >>
FIG. 8 is a configuration diagram of a power receiving antenna coil portion that is a main part of the power receiving antenna according to the second embodiment. The power receiving antenna includes a power receiving antenna coil unit 202 and a capacitor connected thereto. The power receiving antenna coil unit 202 includes a first loop conductor 21, a second loop conductor 22, and a third loop conductor 23. In the XYZ rectangular coordinate system, the first loop conductor 21 has the coil axis facing the Z-axis direction, the second loop conductor 22 has the coil axis facing the X-axis direction, and the third loop conductor 23 has the coil axis Y-axis. Turn to the direction. Therefore, the magnetic flux in the Z-axis direction is linked to the first loop-shaped conductor 21, the magnetic flux in the X-axis direction is linked to the second loop-shaped conductor 22, and the magnetic flux in the Y-axis direction is linked to the third loop-shaped conductor 23. Interact.

  As shown in FIG. 8, the substrate 20 has a rectangular plate shape having four sides, and cut portions C are formed on the four sides (edges). The loop surface of the first loop conductor 21 is formed along the upper surface (first main surface) of the substrate 20. The second loop conductor 22 and the third loop conductor 23 are held in the cut portion C of the substrate 20.

  The first loop conductor 21 is a conductor pattern formed on the substrate 20. The second loop conductor 22 and the third loop conductor 23 are formed by bending a conductive wire.

  Note that the loop surface of the first loop conductor 21 may be formed along the lower surface (second main surface) of the substrate 20. The first loop conductor 21 may also be formed by bending a conductive wire in the same manner as the second loop conductor 22 and the third loop conductor 23.

  Thus, by assembling the three loop conductors 21, 22, and 23 with the substrate 20 interposed, it can be handled as an integrated power receiving antenna.

<< Third Embodiment >>
FIG. 9 is a circuit diagram of a power receiving device including the power receiving antenna 213A and the power receiving circuit 40 according to the third embodiment. FIG. 10 is a circuit diagram of a power receiving apparatus including another power receiving antenna 213B and a power receiving circuit 40 according to the third embodiment.

  A power receiving antenna 213A shown in FIG. 9 includes a first loop conductor 21, a second loop conductor 22, a third loop conductor 23, and capacitors 31, 32, and 33. The first loop-like conductor 21 and the capacitor 31 constitute a first LC resonance circuit, and the second loop-like conductor 22 and the capacitor 32 constitute a second LC resonance circuit. The conductor 23 and the capacitor 33 constitute a third LC resonance circuit. Both resonant circuits resonate at the frequency of the high-frequency magnetic field generated by the power feeding device. A rectifying / smoothing circuit including diodes D1, D2, D3 and a capacitor C1 is connected to these resonance circuits. The rectified and smoothed voltage is converted to a constant voltage by the regulator circuit REG and the capacitor C2, and supplied to the load.

  As described above, the first loop-shaped conductor 21 and the second loop-shaped conductor 22 may constitute a resonance circuit for each loop-shaped conductor and rectify and smooth their combined output.

  The power receiving antenna 213B shown in FIG. 10 includes three LC resonance circuits including a first loop conductor 21, a second loop conductor 22, a third loop conductor 23, and capacitors 31, 32, and 33. The circuits are connected in parallel. Therefore, equivalently, it acts as one resonance circuit composed of a parallel inductor of three loop conductors 21, 22, 23 and a parallel capacitor of three capacitors 31, 32, 33. And the rectification smoothing circuit by the diode D and the capacitor C1 is connected to the resonance circuit. The rectified and smoothed voltage is converted to a constant voltage by the regulator circuit REG and the capacitor C2, and supplied to the load.

<< Fourth Embodiment >>
FIG. 11 is a configuration diagram of a power receiving antenna coil portion that is a main part of the power receiving antenna according to the fourth embodiment. The power receiving antenna coil unit 204 includes a first loop conductor 21, a second loop conductor 22, a third loop conductor 23, and a substrate 20 on which the loop conductors 21, 22 and 23 are provided. In the XYZ rectangular coordinate system, the first loop conductor 21 has the coil axis facing the Z-axis direction, the second loop conductor 22 has the coil axis facing the X-axis direction, and the third loop conductor 23 has the coil axis Y-axis. Turn to the direction. The three loop conductors 21, 22, and 23 are connected in series.

  FIG. 12 is a circuit diagram of the power receiving antenna 214 and the power receiving circuit 40. The resonant voltage of the LC resonance circuit formed by the first loop-shaped conductor 21, the second loop-shaped conductor 22, the third loop-shaped conductor 23 and the capacitor 31 of the power receiving antenna coil unit 204 is rectified and smoothed by the diode D and the capacitor C1, and the regulator The voltage is made constant by the circuit REG and the capacitor C2, and supplied to the load.

  The capacitor 31 may be mounted on the substrate 20 shown in FIG. The power receiving circuit 40 may also be provided on the substrate 20 on which the power receiving antenna coil unit 204 is configured.

<< Fifth Embodiment >>
FIG. 13 is a configuration diagram of a power receiving antenna coil unit, which is a main part of the power receiving antenna according to the fifth embodiment, to which a power receiving circuit is connected. The power receiving antenna includes a power receiving antenna coil unit 205 and a capacitor connected thereto.

  The power receiving antenna coil unit 205 includes conductors 20X1 and 20X2 extending in the X-axis direction, conductors 20Y1 and 20Y2 extending in the Y-axis direction, and conductors 20Z1 and 20Z2 extending in the Z-axis direction.

  Among these conductors, the conductors 20X1, 20X2, 20Y1, and 20Y2 that intersect the magnetic flux in the Z-axis direction are “first conductors” according to the present invention, and the conductors 20Y1, 20Y2, 20Z1, and 20Z2 that intersect the magnetic flux in the X-axis direction are the present invention. The “second conductor” according to the present invention and the conductors 20X1, 20X2, 20Z1, and 20Z2 where the magnetic fluxes in the Y-axis direction intersect are the “third conductor” according to the present invention.

  Of these conductors, the conductors 20X1, 20X2, and 20Y1 on the XY plane are formed on the upper surface (first main surface) of the substrate 20. The other conductors 20Y2, 20Z1, and 20Z2 are placed on the upper surface of the substrate 20.

  In this manner, even if there are no three independent loop-shaped conductors, stable power feeding is possible in a posture in which the power receiving antenna coil unit 205 faces any three-dimensional direction with respect to the power feeding device.

<< Other embodiments >>
In each of the embodiments described above, the power receiving antenna coil portion is provided with a conductor that extends linearly in each of the XYZ axial directions. However, these may be partially curved or may be shown in each embodiment. Of the conductors, the linear portion may be curved to some extent. That is, you may deform | transform in the range with the same effect as mentioned above.

  Moreover, in each embodiment shown above, although the 1st loop-shaped conductor, the 2nd loop-shaped conductor, and the 3rd loop-shaped conductor showed all the same shape and the same size, these showed the same shape, They do not have to be the same size.

  Moreover, in each embodiment shown above, although the 1st loop-shaped conductor, the 2nd loop-shaped conductor, and the 3rd loop-shaped conductor showed the example which is a loop shape which is less than 1 turn or 1 turn, These may be multi-turn patterns.

C ... Cut-in portions C1, C2 ... Capacitors D, D1, D2, D3 ... 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 portion 11S ... Short path portion 12 ... Capacitor 13 ... Inverter circuit 20 ... Substrate 20X1, 20X2, 20Y1, 20Y2 ... First conductor 20Y1, 20Y2, 20Z1, 20Z2 ... Second conductor 20X1, 20X2, 20Z1, 20Z2 ... Third conductor 21 ... 1st loop conductor 22 ... 2nd loop conductor 23 ... 3rd loop conductors 31, 32, 33 ... Capacitor 40 ... Power receiving circuit 101 ... Wireless power feeder 201 ... Power receiving antenna coil unit 202 ... Power receiving antenna coil unit 205 ... Power receiving Antenna coil section 211... Power receiving antennas 213A, 213B. Power antenna 214 ... power receiving antenna

The present invention relates to a wireless power feeding system composed of the wireless power supply apparatus and a power receiving device.

An object of the present invention may be receiving a indefinite relative posture of the power receiving device for wireless power supply apparatus, and to provide a wireless power feeding system which facilitates the configuration of the coil portion.

(1) The wireless power feeding system of the present invention
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 wireless power feeder includes a power feeding antenna having a meander-shaped conductor formed of a combination of a plurality of long path portions extending in the Y-axis direction and a plurality of short path portions extending in the X-axis direction in an XYZ orthogonal coordinate system. ,
In the XYZ orthogonal coordinate system, the power receiving device includes a first conductor where magnetic flux in the Z-axis direction intersects, a second conductor where magnetic flux in the X-axis direction intersects, and a third conductor where magnetic flux in the Y-axis direction intersects;
A substrate providing the first conductor, the second conductor and the third conductor,
A capacitor to constitute an LC resonance circuit together with the first conductor, the second conductor and the third inductance conductor has,
A receiving-antenna to supra Symbol first conductor, the current induced in the second conductor and the third conductor takes as power from the LC resonant circuit,
With
Wherein at least a portion of said first conductor is formed along the first major surface or second major surface of said substrate, at least a portion of said second conductor and said third conductor is a first main of the substrate It is characterized by being placed on the first main surface of the substrate so as to stand up from the surface.

(2) The first conductor forms a loop in which magnetic flux in the Z-axis direction is linked, the second conductor forms a loop in which magnetic flux in the X-axis direction is linked, and the third conductor is in the Y-axis direction. It is preferable to form a loop in which magnetic fluxes are linked.

(3) pre-Symbol substrate has a rectangular plate shape having four sides cut portion is formed,
Wherein the first conductor is formed along the first major surface or second major surface of said substrate, said second conductor and said third conductor is preferably held in the cut portion of the substrate.

(6) In the above (1) to ( 3 ), the capacitor is three capacitors, and the LC resonance circuit is composed of the three capacitors, the first conductor, the second conductor, and the third conductor. that a three LC resonant circuits, the resonant frequency of the three LC resonant circuit is substantially not equal, it is preferable. With this configuration, the three parallel resonance circuits resonate with the frequency of the high-frequency magnetic field generated from the power supply device, and high-efficiency power reception is possible.

(7) In the above (1) to ( 3 ), a parallel circuit is configured by the first conductor, the second conductor, and the third conductor, and the LC resonance circuit includes the parallel circuit and the capacitor. constructed may be a single LC resonant circuit. With this configuration, the number of parts is reduced.

ADVANTAGE OF THE INVENTION According to this invention, even if the relative attitude | position of the power receiving apparatus with respect to a wireless power feeding apparatus is indefinite, it can receive electric power and can comprise the wireless power feeding system which made the structure of a coil part easy.

Claims (7)

In the XYZ orthogonal coordinate system, a first conductor where the magnetic flux in the Z-axis direction intersects, a second conductor where the magnetic flux in the X-axis direction intersects, a third conductor where the magnetic flux in the Y-axis direction intersects,
A substrate on which the first conductor, the second conductor, and the third conductor are provided;
A capacitor constituting an LC resonance circuit together with inductances of the first conductor, the second conductor and the third conductor;
With
In the power receiving antenna in which the current induced in the first conductor, the second conductor, and the third conductor is extracted from the LC resonance circuit as power,
At least a part of the first conductor is formed along the first main surface or the second main surface of the substrate, and at least a part of the second conductor and the third conductor is formed from the first main surface of the substrate. The power receiving antenna is placed on the first main surface of the substrate so as to stand upright. The first conductor forms a loop in which the magnetic flux in the Z-axis direction is linked, the second conductor forms a loop in which the magnetic flux in the X-axis direction is linked, and the third conductor is in the Y-axis direction. Form a loop that links magnetic flux,
The first conductor is formed along the first main surface or the second main surface of the substrate, and the second conductor and the third conductor stand up from the first main surface of the substrate. The power receiving antenna according to claim 1, which is placed on the first main surface. In the XYZ orthogonal coordinate system, a first conductor where the magnetic flux in the Z-axis direction intersects, a second conductor where the magnetic flux in the X-axis direction intersects, a third conductor where the magnetic flux in the Y-axis direction intersects,
A substrate on which the first conductor, the second conductor, and the third conductor are provided;
A capacitor constituting an LC resonance circuit together with inductances of the first conductor, the second conductor and the third conductor;
With
In the power receiving antenna in which the current induced in the first conductor, the second conductor, and the third conductor is extracted from the LC resonance circuit as power,
The first conductor forms a loop in which the magnetic flux in the Z-axis direction is linked, the second conductor forms a loop in which the magnetic flux in the X-axis direction is linked, and the third conductor is in the Y-axis direction. Form a loop that links magnetic flux,
The substrate has a rectangular plate shape having four sides, and cut portions are formed on the four sides.
The first conductor is formed along a first main surface or a second main surface of the substrate, and the second conductor and the third conductor are held in a cut portion of the substrate. antenna.   The power receiving antenna according to claim 1, wherein the first conductor, the second conductor, and the third conductor are electrically connected in series.   The power receiving antenna according to claim 4, wherein the first conductor, the second conductor, and the third conductor are formed by bending a single conducting wire.   The capacitor is three capacitors that constitute three LC resonance circuits together with the first conductor, the second conductor, and the third conductor, and the three LC resonance circuits have substantially equal resonance frequencies. The power receiving antenna according to any one of?   The parallel circuit is comprised by the said 1st conductor, the said 2nd conductor, and the said 3rd conductor, The single LC resonance circuit is comprised by this parallel circuit and the said capacitor, The any of Claims 1-3 The power receiving antenna according to the above.

Images