JPWO2017169543A1 - Coil antenna, power feeding device, power receiving device, and wireless power supply system - Google Patents

Abstract

The coil antenna (101) includes a plurality of coil conductors (L1, L2) wound around a winding axis (AX) and connected in parallel to each other. The plurality of coil conductors (L1, L2) have a parallel running portion (PL) wound in parallel running as viewed from the winding axis (AX) direction (Z-axis direction). The parallel running portion (PL) has intersections (CR1, CR2, CR3, CR4, CR5, CR6) where the plurality of coil conductors (L1, L2) are not connected and intersect each other.

Description

  The present invention relates to a coil antenna including a plurality of coil conductors, a power feeding device including the coil antenna, a power receiving device, and a wireless power supply system.

  2. Description of the Related Art Conventionally, there is known a magnetic resonance power supply system that enables wireless power supply by magnetically coupling a power feeding coil antenna and a power receiving coil antenna (Patent Document 1).

  For example, Patent Document 1 discloses a power feeding coil antenna having a structure in which two coil conductors connected in parallel run in parallel on a plane and are wound in a spiral shape.

Japanese Patent No. 5221111

  However, in the coil antenna having the above structure, the line length of the coil conductor wound around the outside of the two coil conductors running in parallel is different from the line length of the coil conductor wound inside, so that the outside is wound. The inductance value of the coil conductor is different from the inductance value of the coil conductor wound inside. Therefore, depending on the relative positional relationship between the power feeding coil antenna and the power receiving coil antenna, the coil coil antenna is strongly coupled to one of the two coil conductors having different inductance values. Therefore, the coupling strength varies depending on the relative positional relationship between the power feeding coil antenna and the power receiving coil antenna, and there is a possibility that appropriate wireless power supply may not be performed.

  An object of the present invention is to provide a coil antenna having a small change in coupling strength due to a relative positional relationship with a counterpart coil antenna in a structure including a plurality of coil conductors connected in parallel. It is another object of the present invention to provide a power feeding device, a power receiving device, and a wireless power supply system including the same.

(1) The coil antenna of the present invention is used in a wireless power supply system,
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing portion in a parallel running portion that is wound in parallel when viewed from the winding axis direction.

  In this configuration, a plurality of coil conductors that are wound in parallel are arranged so that the inside and outside arrangements of the coil conductors are interchanged at intersections. It is almost the same. Therefore, the inductance values of the plurality of coil conductors are substantially the same, and a coil antenna with a small change in coupling strength due to the relative positional relationship with the counterpart coil antenna can be realized.

(2) In the above (1), the plurality of coil conductors may be wound in a spiral shape when viewed from the winding axis direction.

(3) In the above (2), it is preferable that the number of the intersections per turn of the parallel running portion is one or more. With this configuration, it is possible to easily reduce the difference in the line lengths of the plurality of coil conductors wound in parallel.

(4) In the above (2) or (3), the plurality of coil conductors have a first portion that is close in distance from the winding axis in the radial direction and a distance from the winding axis in the radial direction. It is preferable that a gap between the coil conductors adjacent to each other in the parallel portion is smaller in the second portion than in the first portion. In this configuration, when viewed from the winding axis direction, the coil conductor is wound sparsely on the inner periphery (first portion) where the magnetic flux density is high, and the coil conductor is wound densely on the outer periphery (second portion) where the magnetic flux density is low. It becomes a structure to be. In general, a coil antenna wound so that the intervals between coil conductors are equal to each other is such that a current flows through the coil antenna on the upper surface (or lower surface) of the coil antenna in the winding axis direction of the coil antenna. The component of the resulting magnetic flux density in the winding axis direction is stronger as it is closer to the winding axis (coil center) in the radial direction, and weaker as it is farther from the winding axis (coil center). According to the above configuration, since the coil conductors are wound so that the distance between the coil conductors becomes closer to the outer periphery from the winding axis in the radial direction, the magnetic flux density is increased on the upper surface (or lower surface) of the coil antenna. The winding axis direction component is uniform. Therefore, a variation in the coupling strength due to the relative positional relationship with the coil antenna of the coupling partner is suppressed, and the coupling antenna with which the coupling coefficient with the coil antenna of the coupling partner is stabilized in a wide range of relative positional relationships. realizable.

(5) In any one of the above (2) to (4), the plurality of coil conductors include a first portion that is close in distance from the winding axis in the radial direction, and a distance from the winding axis in the radial direction. A second portion having a distance farther than the first portion, and the number of intersections per turn of the first portion is greater than the number of intersections per turn of the second portion. Less is preferred. The second part has a longer line length per turn than the first part. Therefore, with this configuration, even if the number of intersections is the same, the difference in the line lengths of the plurality of coil conductors wound in parallel can be more effectively reduced.

(6) In any one of the above (1) to (5), it is preferable that the intersection is separated in a direct current manner. With this configuration, since the local loop of the coil conductor is not formed in the coil antenna, it is possible to suppress a loss caused by the induced current that flows when the magnetic flux is linked to the local loop of the coil conductor.

(7) The power feeding device of the present invention
A power feeding device in a wireless power supply system that wirelessly supplies power from a power feeding device to a power receiving device,
A coil antenna used for coupling with the power receiving device;
A power feeding circuit electrically connected to the coil antenna;
With
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing portion in a parallel running portion that is wound in parallel when viewed from the winding axis direction.

  With this configuration, it is possible to realize a power feeding device for a wireless power transmission system including a coil antenna with a small change in coupling strength due to a relative positional relationship with the counterpart coil antenna.

(8) In the above (7), the power feeding circuit may apply an HF band alternating voltage to the coil antenna.

(9) The power receiving device of the present invention includes:
A power receiving device in a wireless power supply system that wirelessly supplies power from a power feeding device to a power receiving device,
A coil antenna used for coupling with the power feeding device;
A power receiving circuit connected to the coil antenna;
With
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing portion in a parallel running portion that is wound in parallel when viewed from the winding axis direction.

  With this configuration, it is possible to realize a power receiving device of a wireless power transmission system including a coil antenna with a small change in coupling strength due to a relative positional relationship with the counterpart coil antenna.

(10) In the above (9), a resonance circuit may be configured by a capacitance component of the power reception circuit and an inductance component of the coil antenna, and the resonance frequency of the resonance circuit may be a frequency in the HF band.

(11) A wireless power supply system according to the present invention, which includes a power feeding device and a power receiving device,
The power supply device
A coil antenna used for coupling with the power receiving device;
A power feeding circuit electrically connected to the coil antenna;
Have
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing point in a parallel running portion that is wound in parallel when viewed from the winding axis direction,
The power receiving device includes a coil antenna used for coupling with the power feeding device.

  With this configuration, it is possible to realize a wireless power supply system including a power feeding device including a coil antenna with a small change in coupling strength due to a relative positional relationship with the counterpart coil antenna.

(12) In the above (11), the power feeding circuit may apply an HF band alternating voltage to the coil antenna.

(13) The wireless power supply system of the present invention including the power feeding device and the power receiving device
The power receiving device is:
A coil antenna used for coupling with the power feeding device;
A power receiving circuit electrically connected to the coil antenna;
Have
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing point in a parallel running portion that is wound in parallel when viewed from the winding axis direction,
The power feeding device includes a coil antenna used for coupling with the power receiving device.

  With this configuration, it is possible to realize a wireless power supply system including a power receiving device including a coil antenna with a small change in coupling strength due to a relative positional relationship with the counterpart coil antenna.

(14) In the above (13), a resonance circuit may be configured by the capacitance component of the power reception circuit and the inductance component of the coil antenna, and the resonance frequency of the resonance circuit may be a frequency in the HF band.

  ADVANTAGE OF THE INVENTION According to this invention, in the structure provided with the several coil conductor connected in parallel, the coil antenna with a small change of coupling strength by the relative positional relationship with the other party coil antenna is realizable. In addition, a power feeding device, a power receiving device, and a wireless power supply system including the same can be realized.

FIG. 1 is a plan view of a coil antenna 101 according to the first embodiment. FIG. 2 is a plan view showing coil conductors L1 and L2 included in the coil antenna 101. FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is an enlarged plan view of the intersection CR2 shown in FIG. 4A is a cross-sectional view showing a coil antenna 101A different from the coil antenna 101 shown in FIG. 1, and FIG. 4B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 101A. is there. FIG. 5 is a plan view of the coil antenna 102 according to the second embodiment. FIG. 6 is a plan view showing parallel running portions PL1, PL2, and PL3 of a plurality of coil conductors included in the coil antenna 102. FIG. 7A is a cross-sectional view taken along the line BB in FIG. 5, and FIG. 7B is an enlarged plan view of the connection portion PR1 shown in FIG. FIG. 8 is a plan view of the coil antenna 103 according to the third embodiment. FIG. 9 is a plan view showing coil conductors L1, L2, L3, L4, L5, and L6 included in the coil antenna 103. FIG. FIG. 10A is a plan view of the coil antenna 104 according to the fourth embodiment, and FIG. 10B is a plan view of the coil antenna 104 showing a conductor pattern formed on the back surface of the substrate 1. 11A is a cross-sectional view taken along the line CC in FIG. 10A, and FIG. 11B is an enlarged plan view of the intersection CR2 shown in FIG. FIG. 12A is a plan view of a coil antenna 105A according to the fifth embodiment, and FIG. 12B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 105A. FIG. 13A is a plan view of another coil antenna 105B according to the fifth embodiment, and FIG. 13B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 105B. FIG. 14A is a plan view of a coil antenna 106 according to the sixth embodiment, and FIG. 14B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 106. FIG. FIG. 15 is a circuit diagram of a wireless power supply system 401 according to the seventh embodiment. FIG. 16 is a circuit diagram of a wireless power supply system 402 different from the wireless power supply system 401 shown in FIG. FIG. 17 is a circuit diagram of a wireless power supply system 403 different from the wireless power supply systems 401 and 402 shown in FIGS. 14 and 15.

  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. In consideration of ease of explanation or understanding of the main points, the embodiments are shown separately for convenience, but the components shown in different embodiments can be partially replaced or combined. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.

  The present invention is suitable for a system that requires a degree of positional freedom on a plane, such as a mouse and a mouse pad. In each of the embodiments described below, when wireless power feeding is performed to a mouse, the “coil antenna” in the present invention is provided on a mouse pad, for example, and the power receiving side coil antenna is provided on the mouse.

<< First Embodiment >>
FIG. 1 is a plan view of a coil antenna 101 according to the first embodiment. FIG. 2 is a plan view showing coil conductors L1 and L2 included in the coil antenna 101. FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is an enlarged plan view of the intersection CR2 shown in FIG. In FIG. 2, one of the coil conductors is indicated by a broken line for easy understanding of the structure. The coil antenna 101 is a coil antenna used for coupling a power feeding apparatus and a power receiving apparatus that constitute a wireless power supply system, and is provided in either or both of the power feeding apparatus and the power receiving apparatus.

  The coil antenna 101 includes a base material 1 and two coil conductors L1 and L2.

  The two coil conductors L1 and L2 are formed on the surface of the substrate 1 and the like, and are rectangular spiral conductor patterns of about 3 turns wound around the winding axis AX. The two coil conductors L1 and L2 have a parallel running portion PL that is wound in parallel as viewed from the Z-axis direction (corresponding to the “winding axis direction” in the present invention). In the present embodiment, both ends of the two coil conductors L1 and L2 are connected at the first end T1 and the second end T2 of the coil antenna 101. That is, the two coil conductors L1 and L2 are connected in parallel to each other. By connecting two coil conductors L1 and L2 wound in parallel with each other in parallel, the influence of parasitic capacitance between the coil conductors wound in parallel with each other is suppressed, and the self-resonance of the coil antenna The frequency can be increased. The substrate 1 is a rectangular flat plate made of an insulating material, and is a resin sheet such as polyimide (PI) or liquid crystal polymer (LCP). The coil conductors L1, L2 are, for example, Cu foil patterns.

  The parallel running portion PL has six intersections CR1, CR2, CR3, CR4, CR5, and CR6. Intersection locations CR1, CR2, CR3, CR4, CR5, and CR6 are locations where the coil conductor L1 and the coil conductor L2 intersect with each other without being connected. In the present embodiment, for example, as shown in FIG. 3B, the coil conductor L2 jumps over the coil conductor L1 via the coil conductor L2J and interlayer connection conductors V2a and V2b formed on the back surface of the base material 1. (Stretched). In the present embodiment, as shown in FIG. 1 and the like, the number of intersections per turn of the parallel running portion PL is two.

  In the present embodiment, as shown in FIG. 1 and the like, two coil conductors L1 and L2 that are wound in parallel and wound (bifilar winding) are crossed at CR1, CR2, CR3, CR4, CR5, and CR6. The arrangement is such that the inside and outside arrangements of L1 and coil conductor L2 are interchanged. For this reason, the line lengths of the two coil conductors L1, L2 wound in parallel are substantially the same. Therefore, the inductance values and resistance values of the coil conductors L1 and L2 are substantially the same. When the inductance values and resistance values of the coil conductors L1 and L2 are substantially the same, the magnetic flux generated in the coil conductor L1 and the magnetic flux generated in the coil conductor L2 are substantially the same, and variations in magnetic flux density are suppressed. Thereby, it is possible to realize a coil antenna having a small change in coupling strength due to a relative positional relationship with the coil antenna on the other side.

  Further, at the intersections CR1, CR2, CR3, CR4, CR5, and CR6, the coil conductor L1 and the coil conductor L2 are not connected. That is, at the intersections CR1, CR2, CR3, CR4, CR5, and CR6, the coil conductor L1 and the coil conductor L2 are DC separated. Therefore, since the local loop of the coil conductor is not formed in the coil antenna 101, it is possible to suppress the loss due to the induced current that flows when the magnetic flux is linked to the local loop of the coil conductor.

  In the present embodiment, an example is shown in which the number of intersections per turn of the parallel running portion PL is two, but the present invention is not limited to this configuration. If the number of intersecting portions per turn of the parallel running portion PL is one or more, the difference in line length between the two coil conductors L1 and L2 wound in parallel running can be easily reduced.

  In the present embodiment, an example of the coil antenna 101 having six intersections has been described, but the present invention is not limited to this configuration. The number, position, and the like of the intersections can be changed as appropriate within the range where the functions and effects of the present invention are exhibited. If the coil antenna has one or more intersections, the effects and advantages of the present invention can be obtained.

  In the present invention, the “intersection” refers to a portion provided in the middle of the “parallel portion PL wound in parallel” as viewed from the Z-axis direction, and a plurality of coil conductors intersect each other. . That is, as in the bridge portion BE shown in FIG. 2, a portion that intersects with each other when a plurality of coil conductors are drawn from the inner periphery to the outer periphery is excluded from the “intersection” in the present invention. The same applies to the following embodiments.

  Next, a modification of the coil antenna 101 according to the present embodiment will be described. 4A is a cross-sectional view showing a coil antenna 101A different from the coil antenna 101 shown in FIG. 1, and FIG. 4B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 101A. is there. In FIG. 4B, one coil conductor is indicated by a broken line for easy understanding of the structure.

  The coil antenna 101A has intersections CR1, CR2, CR3, CR4, and CR5. As shown in FIGS. 4A and 4B, the intersections CR1, CR2, CR3, CR4, and CR5 are respectively disposed at the corners of the rectangular spiral coil antenna 101A.

  Even with such a configuration, the same operation and effect as the coil antenna 101 shown in the present embodiment are obtained.

<< Second Embodiment >>
In 2nd Embodiment, the example of the coil antenna which has a some intersection location and a some connection location in a parallel running part is shown.

  FIG. 5 is a plan view of the coil antenna 102 according to the second embodiment. FIG. 6 is a plan view showing parallel running portions PL1, PL2, and PL3 of a plurality of coil conductors included in the coil antenna 102. FIG. 7A is a cross-sectional view taken along the line BB in FIG. 5, and FIG. 7B is an enlarged plan view of the connection portion PR1 shown in FIG. In FIG. 6, in order to make the structure easy to understand, the coil conductors L1 and L2 are indicated by solid lines, the coil conductors L3 and L4 are indicated by broken lines, and the coil conductors L5 and L6 are indicated by alternate long and short dash lines.

  The coil antenna 102 according to the present embodiment is different from the coil antenna 101 according to the first embodiment in that it includes six coil conductors L1, L2, L3, L4, L5, and L6. Moreover, the coil antenna 102 is different from the coil antenna 101 in that it has connection points PR1 and PR2 instead of the crossing points CR3 and CR6 in the parallel running portion. Other configurations are substantially the same as those of the coil antenna 101.

  The six coil conductors L1, L2, L3, L4, L5, and L6 are conductor patterns formed on the surface of the substrate 1 and wound around the winding axis AX. The two coil conductors L1, L2 have a parallel portion PL1 that is wound in parallel as viewed from the Z-axis direction. The two coil conductors L3 and L4 have a parallel portion PL2 that is wound in parallel as viewed from the Z-axis direction. Further, the two coil conductors L5 and L6 have a parallel running portion PL3 that is wound in parallel when viewed from the Z-axis direction.

  The two coil conductors L1 and L2 are rectangular spiral conductor patterns of about 5/4 turns wound around the winding axis AX, and the two coil conductors L3 are connected at a connection point PR1 (described in detail later). , L4. The two coil conductors L3 and L4 are rectangular spiral conductor patterns of about 1.5 turns wound around the winding axis AX, and the two coil conductors L5 are connected at a connection point PR2 (described in detail later). , L6. The two coil conductors L5 and L6 are approximately 1/4 turn rectangular loop-shaped conductor patterns wound around the winding axis AX.

  The parallel running portions PL1, PL2, and PL3 according to the present embodiment have four intersections CR1, CR2, CR4, and CR5 and two connection points PR1 and PR2. Intersection locations CR1 and CR2 are locations where the coil conductor L1 and the coil conductor L2 intersect each other, and intersection locations CR4 and CR5 are locations where the coil conductor L3 and the coil conductor L4 intersect each other. The structures of the intersections CR1, CR2, CR4, and CR5 are substantially the same as the intersection CR2 shown in the first embodiment.

  Connection locations PR1, PR2 are locations where a plurality of coil conductors are connected to each other. In this embodiment, for example, as shown in FIG. 7B, the second end of the coil conductor L1, the second end of the coil conductor L2, the first end of the coil conductor L3, and the first end of the coil conductor L4 are connected. They are connected to each other at the location PR1. The second end of the coil conductor L3, the second end of the coil conductor L4, the first end of the coil conductor L5, and the first end of the coil conductor L6 are connected to each other at the connection point PR2.

  That is, both ends of the two coil conductors L1 and L2 are connected to the first end T1 of the coil antenna 102 at the connection location PR1. In this way, the two coil conductors L1, L2 are connected in parallel to each other. Both ends of the two coil conductors L3 and L4 are connected at connection points PR1 and PR2. In this way, the two coil conductors L3 and L4 are connected in parallel to each other. Both ends of the two coil conductors L5 and L6 are connected at the connection point PR2 and the second end T2 of the coil antenna 102. In this way, the two coil conductors L5 and L6 are connected in parallel to each other.

  Then, the two coil conductors L1 and L2 connected in parallel, the two coil conductors L3 and L4 connected in parallel, and the two coil conductors L5 and L6 connected in parallel are connected in series, and a rectangular spiral of about 3 turns. The conductor pattern is formed.

  Even in such a configuration, since the line lengths of the two coil conductors wound in parallel are substantially the same, the same operation and effect as the coil antenna 101 according to the first embodiment can be achieved. Further, the two coil conductors that run in parallel are connected at the connection points PR1 and PR2, thereby suppressing variations in magnetic flux density due to a slight difference in line length between the two coil conductors.

  Note that, as shown in the present embodiment, the coil antenna is not limited to the configuration including two coil conductors, and the coil antenna may include two or more coil conductors. In addition, when providing two or more coil conductors, the effect | action and effect of this invention can be show | played by making at least 2 coil conductors cross | intersect each other in the cross | intersection location among several coil conductors running in parallel.

  Moreover, in this embodiment, although the structure which has three crossing places and three connection places in the parallel running part was shown, it is not limited to this. The number and position of the intersections and connection points provided in the parallel running portion can be changed as appropriate within the scope of the effects and advantages of the present invention. As described above, the operation and effect of the present invention can be achieved as long as the coil antenna has one or more intersections.

<< Third Embodiment >>
In 3rd Embodiment, the example of the coil antenna provided with the coil conductors L3 and L6 which do not have a parallel running part is shown.

  FIG. 8 is a plan view of the coil antenna 103 according to the third embodiment. FIG. 9 is a plan view showing coil conductors L1, L2, L3, L4, L5, and L6 included in the coil antenna 103. FIG. In FIG. 9, for easy understanding of the structure, the coil conductors L1 and L2 are indicated by broken lines, and the coil conductors L4 and L5 are indicated by alternate long and short dash lines.

  The coil antenna 103 includes a base material 1 and six coil conductors L1, L2, L3, L4, L5, and L6.

  The coil conductors L1, L2, L3, L4, L5, and L6 are conductor patterns formed on the surface of the substrate 1 and wound around the winding axis AX. The two coil conductors L1, L2 have a parallel portion PL1 that is wound in parallel as viewed from the Z-axis direction. Further, the two coil conductors L4 and L5 have a parallel running portion PL2 that is wound in parallel running as viewed from the Z-axis direction.

  The two coil conductors L1 and L2 are rectangular loop-shaped conductor patterns of about 3/4 turns wound around the winding axis AX, and are connected to the coil conductor L3 at a connection point PR1 (described in detail later). Is done. The coil conductor L3 is a rectangular loop-shaped conductor pattern of about 1/2 turn wound around the winding axis AX, and is connected to the two coil conductors L4 and L5 at the connection point PR2. The two coil conductors L4 and L5 are rectangular loop-shaped conductor patterns of about 1 turn wound around the winding axis AX, and are connected to the coil conductor L6 at a connection point PR3 (described in detail later). . The coil conductor L6 is a rectangular loop-shaped conductor pattern of about 3/4 turns wound around the winding axis AX.

  The parallel running portions PL1 and PL2 according to the present embodiment have two intersections CR1 and CR2 and three connection points PR1, PR2 and PR3. The intersection CR1 is where the coil conductor L1 and the coil conductor L2 intersect each other, and the intersection CR2 is where the coil conductor L4 and the coil conductor L5 intersect each other. The structures of the intersections CR1 and CR2 are substantially the same as the intersections CR2 shown in the first embodiment.

  Connection locations PR1, PR2, and PR3 are locations where a plurality of coil conductors are connected to each other. The second end of the coil conductor L1, the second end of the coil conductor L2, and the first end of the coil conductor L3 are connected to each other at a connection location PR1. The second end of the coil conductor L3, the first end of the coil conductor L4, and the first end of the coil conductor L5 are connected to each other at the connection location PR2. The second end of the coil conductor L4, the second end of the coil conductor L5, and the first end of the coil conductor L6 are connected to each other at a connection location PR3.

  That is, both ends of the two coil conductors L1 and L2 are connected to the first end T1 of the coil antenna 103 at the connection location PR1. In this way, the two coil conductors L1, L2 are connected in parallel to each other. Both ends of the two coil conductors L4 and L5 are connected in parallel at connection points PR2 and PR3. In this way, the two coil conductors L4 and L5 are connected in parallel to each other.

  Then, the two coil conductors L1 and L2 connected in parallel, the coil conductor L3, the two coil conductors L4 and L5 connected in parallel, and the coil conductor L6 are connected in series, and a rectangular spiral conductor pattern of about 3 turns. Configure.

  As shown in the present embodiment, the coil antenna only needs to have a parallel running portion at least partially, and may include coil conductors L3 and L6 that do not have the parallel running portion. In addition, like the coil antenna 103, a portion of the coil conductor that is close to the winding axis AX (an inner peripheral portion of the coil conductor shown in FIG. 7, for example, the coil conductor L6) has a parallel running portion. Preferably not. With this configuration, magnetic field formation in the opening where the magnetic flux density is relatively high is suppressed, and variations in magnetic flux density due to the relative positional relationship with the coil antenna are suppressed.

  Even in such a configuration, since the line lengths of the two coil conductors are substantially the same, the same operation and effect as the coil antenna 101 according to the first embodiment can be achieved.

<< Fourth Embodiment >>
In 4th Embodiment, the example of the coil antenna in which the coil conductor is formed in both surfaces of the base material 1 is shown.

  FIG. 10A is a plan view of the coil antenna 104 according to the fourth embodiment, and FIG. 10B is a plan view of the coil antenna 104 showing a conductor pattern formed on the back surface of the substrate 1. 11A is a cross-sectional view taken along the line CC in FIG. 10A, and FIG. 11B is an enlarged plan view of the intersection CR2 shown in FIG. In FIG. 10B, the coil conductors L1A and L2A are not shown for easy understanding of the structure.

  The coil antenna 104 according to this embodiment is different from the coil antenna 101 according to the first embodiment in that a coil conductor is also formed on the back surface of the substrate 1. Other configurations are substantially the same as those of the coil antenna 101.

  The coil antenna 104 includes a base material 1 and four coil conductors L1A, L1B, L2A, and L2B.

  The two coil conductors L1A and L2A are formed on the surface of the base material 1, and are rectangular spiral conductor patterns of about 3 turns wound around the winding axis AX. The two coil conductors L1A and L2A have a parallel running portion PLA that is wound in parallel when viewed from the Z-axis direction.

  The two coil conductors L1B and L2B are formed on the surface of the substrate 1 and are rectangular spiral conductor patterns of about 3 turns wound around the winding axis AX. The two coil conductors L1B and L2B have a parallel running portion PLB that is wound in parallel running as viewed from the Z-axis direction.

  In the present embodiment, the coil conductors L1A and L1B are substantially identical conductor patterns, and the coil conductors L1A and L1B are substantially coincident when viewed from the Z-axis direction. That is, the coil conductors L1A and L1B are arranged to face each other in the thickness direction (Z-axis direction) and wound in parallel in the Z-axis direction, as shown in FIG. The coil conductors L2A and L2B are conductor patterns having substantially the same shape, and the coil conductors L2A and L2B are substantially coincident when viewed from the Z-axis direction. That is, the coil conductors L2A and L2B are disposed facing the Z-axis direction and wound in parallel in the Z-axis direction, as shown in FIG.

  The parallel running portions PLA and PLB according to the present embodiment have six intersections CR1, CR2, CR3, CR4, CR5, and CR6. Crossing points CR1, CR2, CR3, CR4, CR5, and CR6 are points where the two coil conductors L1A and L1B and the two coil conductors L2A and L2B cross each other without being connected. In the present embodiment, for example, as shown in FIG. 11B, the coil conductor L1B is placed on the back surface of the base material 1 via the coil conductor L1A and the interlayer connection conductors V1a and V1b formed on the surface of the base material 1. It jumps over (is straddling) the coil conductor L2B to be formed. In addition, the coil conductor L2A jumps over the coil conductor L1A formed on the surface of the base material 1 via the coil conductor L2B formed on the back surface of the base material 1 and the interlayer connection conductors V2a and V2b. )

  That is, the coil conductors L1A and L1B are connected at the first end T1 and the second end T2 of the coil antenna 104 and the intersections CR1, CR2, CR3, CR4, CR5, and CR6. Thus, the two coil conductors L1A and L1B wound in parallel in the Z-axis direction are connected in parallel to each other. The coil conductors L2A and L2B are connected at the first end T1 and the second end T2 of the coil antenna 104 and the intersections CR1, CR2, CR3, CR4, CR5, and CR6. Thus, the two coil conductors L2A and L2B wound in parallel in the Z-axis direction are connected in parallel to each other.

  The two coil conductors L1A and L2A formed on the same plane (the surface of the base material 1) are connected at the first end T1 and the second end T2 of the coil antenna 104. In this way, the two coil conductors L1A and L2A are connected in parallel to each other. The two coil conductors L1B and L2B formed on the same plane (the back surface of the substrate 1) are connected at the first end T1 and the second end T2 of the coil antenna 104. In this way, the two coil conductors L1B and L2B are connected in parallel to each other.

  Even in such a configuration, the line lengths of the two coil conductors L1A and L2A are formed to be substantially the same, and the line lengths of the two coil conductors L1B and L2B are substantially the same. Therefore, the coil antenna 101 according to the first embodiment. The same actions and effects can be achieved.

  In the present embodiment, two coil conductors L1A and L1B that run in parallel in the Z-axis direction are connected in parallel to each other. Therefore, the combined resistance of the coil conductors L1A and L1B is smaller than the resistance of the coil conductors L1A and L1B alone. Therefore, with this configuration, a coil antenna having a low loss and a high Q value can be realized. Similarly, in this embodiment, two coil conductors L2A and L2B that run in parallel in the Z-axis direction are connected in parallel to each other. Therefore, the combined resistance of the coil conductors L2A and L2B is smaller than the resistance of the coil conductors L2A and L2B alone. Therefore, with this configuration, a coil antenna having a low loss and a high Q value can be realized.

  In the present embodiment, two coil conductors L1A and L1B that run parallel to face each other in the Z-axis direction are connected in parallel to each other, and two coil conductors L2A and L2B that run parallel to face each other in the Z-axis direction are connected to each other. Although the example connected in parallel was shown, it is not limited to this structure. The two coil conductors L1A and L1B that run in parallel in the Z-axis direction may not be connected in parallel to each other, and the two coil conductors L2A and L2B that run in parallel in the Z-axis direction may be in parallel with each other. It does not have to be connected. Note that when a plurality of coil conductors that run parallel to each other in the Z-axis direction are not connected in parallel to each other, a capacitance may be formed between the plurality of coil conductors. In addition, in this invention, seeing from the Z-axis direction, the coil conductors (parallel running part) wound in parallel should just be connected mutually in parallel. That is, two coil conductors L1A and L2B that run in parallel when viewed from the Z-axis direction may be connected in parallel to each other, and two coil conductors L1B and L2A that run in parallel when viewed from the Z-axis direction are parallel to each other. It may be connected to.

<< Fifth Embodiment >>
In the fifth embodiment, an example in which the shapes and the like of the two coil conductors L1 and L2 are different from those of the coil antenna 101 according to the first embodiment is shown.

  FIG. 12A is a plan view of a coil antenna 105A according to the fifth embodiment, and FIG. 12B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 105A.

  The coil antenna 105A according to the present embodiment is different from the coil antenna 101 according to the first embodiment in the shape of the coil conductors L1 and L2. The coil antenna 105 </ b> A is different from the coil antenna 101 in that the coil conductor L <b> 1 is formed on the surface of the substrate 1 and the coil conductor L <b> 2 is formed on the back surface of the substrate 1. Other configurations are substantially the same as those of the coil antenna 101.

  The coil conductor L1 is a rectangular spiral conductor pattern of about 3 turns formed on the surface of the substrate 1 and wound around the winding axis AX. The coil conductor L2 is a rectangular spiral conductor pattern of about 3 turns formed on the back surface of the substrate 1 and wound around the winding axis AX. The two coil conductors L1 and L2 have parallel running portions PL that are wound in parallel as seen from the Z-axis direction. In the present embodiment, both ends of the two coil conductors L1 and L2 are connected at the first end T1 and the second end T2 of the coil antenna 105A. That is, the two coil conductors L1 and L2 are connected in parallel to each other.

  The two coil conductors L1 and L2 have a first portion PE1 that is close in distance R1 from the winding axis AX in the radial direction (see an arrow in FIG. 12A) and a distance R2 from the winding axis AX in the radial direction. And a distant second portion PE2 (R1 <R2). In other words, the two coil conductors L1 and L2 have a first part PE1 located on the inner circumference and a second part PE2 located on the outer circumference side than the first part PE1 when viewed from the Z-axis direction.

  As shown in FIG. 12B, the gap between the adjacent coil conductors L1 and L2 in the parallel running portion PL is larger than the first portion PE1 (the gap S1 between the coil conductors L1 and L2 in the first portion). The two portion PE2 (the gap S2 between the coil conductors L1 and L2 in the second portion) is smaller (S1> S2).

  In the present embodiment, when viewed from the Z-axis direction, the coil conductors L1 and L2 are sparsely wound on the inner periphery (first portion PE1) having a high magnetic flux density, and the outer periphery (second portion PE2) having a low magnetic flux density is a coil. The conductors L1 and L2 are densely wound. In other words, the portion where the distance between the coil conductors L1, L2 is close is located closer to the outer periphery from the winding axis AX in the radial direction, and the sparse portion is located closer to the inner periphery from the winding axis AX in the radial direction. doing. In general, a coil antenna wound so that the intervals between coil conductors are equal to each other is such that a current flows through the coil antenna on the upper surface (or lower surface) of the coil antenna in the winding axis direction of the coil antenna. The component of the resulting magnetic flux density in the winding axis direction is stronger as it is closer to the winding axis (coil center) in the radial direction, and weaker as it is farther from the winding axis (coil center). However, in the coil antenna 105A, since the coil conductors L1 and L2 are wound so that the distance between the coil conductors L1 and L2 becomes closer to the outer periphery from the winding axis AX in the radial direction, on the upper surface (or lower surface) of the coil antenna, The winding axis direction component of the magnetic flux density is uniform. Therefore, with this configuration, a change in magnetic flux density due to a shift in relative positional relationship (particularly in the XY plane direction) with the coil antenna of the coupling partner is suppressed. Therefore, a variation in the coupling strength due to the relative positional relationship with the coil antenna of the coupling partner is suppressed, and the coupling antenna with which the coupling coefficient with the coil antenna of the coupling partner is stabilized in a wide range of relative positional relationships. realizable.

  Next, a modification of the coil antenna 105A according to the present embodiment will be described with reference to the drawings. FIG. 13A is a plan view of another coil antenna 105B according to the fifth embodiment, and FIG. 13B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 105B.

  The coil antenna 105B is different from the coil antenna 105A described above in the shape of the coil conductors L1 and L2. Other configurations are the same as those of the coil antenna 105A.

  The number N1 of intersections per turn of the first part PE1 is smaller than the number N2 of intersections per turn of the second part PE2 (N1 <N2). As shown in FIG. 13B, the coil antenna 105B does not have an intersection at the first portion PE1 (N1 = 0).

  The second portion PE2 has a longer line length per turn than the first portion PE1. Therefore, as described above, the number of intersections N2 per turn of the second part PE2 is made larger than the number N1 of intersections per turn of the first part PE1, so that the number of intersections is the same. Even so, the difference in line length between the two coil conductors L1 and L2 wound in parallel can be more effectively reduced.

<< Sixth Embodiment >>
In the sixth embodiment, a coil antenna having three or more intersections per turn will be described.

  FIG. 14A is a plan view of a coil antenna 106 according to the sixth embodiment, and FIG. 14B is a plan view showing coil conductors L1 and L2 provided in the coil antenna 106. FIG.

  The coil antenna 106 according to the present embodiment is different from the coil antenna 101 according to the first embodiment in the number of intersections per turn. The coil antenna 106 is different from the coil antenna 101 in that the coil conductor L1 is formed on the surface of the base material 1 and the coil conductor L2 is formed on the back surface of the base material 1. Other configurations are substantially the same as those of the coil antenna 101.

  The coil conductor L1 is a rectangular spiral conductor pattern of about 3 turns formed on the surface of the substrate 1 and wound around the winding axis AX. The coil conductor L2 is a rectangular spiral conductor pattern of about 3 turns formed on the back surface of the substrate 1 and wound around the winding axis AX. The two coil conductors L1 and L2 have parallel running portions PL that are wound in parallel as seen from the Z-axis direction. In the present embodiment, both ends of the two coil conductors L1 and L2 are connected at the first end T1 and the second end T2 of the coil antenna 106. That is, the two coil conductors L1 and L2 are connected in parallel to each other.

  The parallel running portion PL has 14 intersections CR1, CR2, CR3, CR4, CR5, CR6, CR7, CR8, CR9, CR10, CR11, CR12, CR13, CR14. Crossing points CR1, CR2, CR3, CR4, CR5, CR6, CR7, CR8, CR9, CR10, CR11, CR12, CR13, CR14 are points where the coil conductor L1 and the coil conductor L2 cross each other without being connected. is there. In the present embodiment, as shown in FIG. 14 and the like, the parallel running portion PL of the two coil conductors L1 and L2 has six intersections per turn.

  In the present embodiment, the number of intersections per turn of the parallel running portion PL is six. With this configuration, the difference in line length between the two coil conductors L1 and L2 that are wound in parallel can be more easily reduced than in the case where the number of intersections per turn of the parallel part PL is small. .

<< Seventh Embodiment >>
In the seventh embodiment, an example of a wireless power supply system using the coil antenna of the present invention is shown.

  The “power supply device” in the present invention is a device including the coil antenna and a power supply circuit (described in detail later), and is, for example, the mouse pad corresponding to a wireless power supply system such as a magnetic resonance power supply system. A “power receiving device” in the present invention is a device including the coil antenna and a power receiving circuit (described in detail later), and for example, a power receiving side device (wireless mouse, Mobile phone terminals, so-called smartphones, tablet terminals, notebook PCs and PDAs, wearable terminals, cameras, videos, game machines, toys, and the like).

  The magnetic resonance power supply system is used in the HF band, particularly in the vicinity of 6.78 MHz. Further, the magnetic field type wireless power supply system couples with a power supply partner by magnetic field coupling and supplies power.

  FIG. 15 is a circuit diagram of a wireless power supply system 401 according to the seventh embodiment. FIG. 16 is a circuit diagram of a wireless power supply system 402 different from the wireless power supply system 401 shown in FIG. FIG. 17 is a circuit diagram of a wireless power supply system 403 different from the wireless power supply systems 401 and 402 shown in FIGS. 14 and 15.

  The wireless power supply systems 401, 402, and 403 include a power feeding device 201 and a power receiving device 301, and supply power from the power feeding device 201 to the power receiving device 301 wirelessly.

  The power feeding device 201 includes a power feeding circuit 210, a power feeding coil antenna Lt, and a power feeding coil antenna Lt and a resonance capacitor Ct constituting a resonance circuit 220. The power feeding circuit 210 is electrically connected to the resonance circuit 220. The In the present embodiment, the feeding coil antenna Lt is directly connected (ohmic connection) to the feeding circuit 210. The power feeding coil antenna Lt is used for coupling with a power receiving circuit 310 included in the power receiving device 301.

  In the wireless power supply system 401, a series resonance circuit including one resonance capacitor Ct is configured. As shown in FIG. 15, the resonant capacitor Ct is connected in series to one end of the power feeding coil antenna Lt.

  In the wireless power supply system 402, a series resonant circuit including two resonant capacitors Ct is configured. As shown in FIG. 16, the two resonance capacitors Ct are directly connected to both ends of the feeding coil antenna Lt, respectively. Thus, the power feeding coil antenna Lt may be connected to the power feeding circuit 201 via the resonance capacitor Ct.

  In the wireless power supply system 403, a parallel resonance circuit including one resonance capacitor Ct is configured. As shown in FIG. 17, the resonant capacitor Ct is connected in parallel to the feeding coil antenna Lt.

  The power feeding circuit 210 includes an inverter circuit 211 that converts the DC input voltage Vi into an AC voltage and applies the AC voltage to the resonance circuit 220. Inverter circuit 211 includes switching elements Q1 and Q2, a capacitor C11, a diode D1, and a drive circuit 212. The drive circuit 212 alternately turns on / off the switching elements Q1 and Q2 at an HF band operating frequency (for example, 6.78 MHz). The resonance frequency of the resonance circuit 220 is the operating frequency or a frequency in the vicinity thereof. In this way, the power feeding circuit 210 applies an alternating voltage in the HF band to the power feeding coil antenna Lt. By setting the resonance frequency of the resonance circuit 220 to the operating frequency or a frequency in the vicinity thereof, the power transmission efficiency can be improved and the power transmission loss can be reduced.

  The power receiving device 301 includes a power receiving circuit 310 and a power receiving coil antenna Lr electrically connected to the power receiving circuit 310. In the present embodiment, the power receiving coil antenna Lr is directly connected (ohmic connection) to the power receiving circuit 310. The power receiving coil antenna Lr is used for coupling to a power feeding circuit 210 provided in the power feeding device 201, and an inductance component of the power receiving coil antenna Lr and a capacitance component of the power receiving circuit 310 constitute a resonance circuit 320. The power receiving coil antenna Lr and the power feeding coil antenna Lt are mainly magnetically coupled.

  The power receiving circuit 310 includes a rectifying / smoothing circuit 311 that converts an AC voltage generated in the power receiving coil antenna Lr into a DC voltage, and a load Ro that is driven by the DC output voltage converted by the rectifying / smoothing circuit 311. The rectifying / smoothing circuit 311 includes a rectifying circuit 312 using a diode bridge circuit, smoothing capacitors C21 and C22, and a voltage regulator circuit 313.

  The resonance circuit 320 resonates at the above-described operating frequency in the HF band or a frequency in the vicinity thereof. The resonant voltage of the resonant circuit 320 is full-wave rectified by the rectifier circuit 312, smoothed and stabilized by the smoothing capacitors C21 and C22, and the voltage regulator circuit 213, and a predetermined constant voltage Vo is supplied to the load Ro.

  In the present embodiment, the feeding coil antenna Lt is the coil antenna 101 having the structure shown in the first embodiment, and the power receiving coil antenna Lr is a normal coil antenna. Note that the “ordinary coil antenna” means that the coil conductor has a simple loop shape or spiral shape.

  The feeding coil antenna may be a normal coil antenna, and the receiving coil antenna may be the coil antenna 101 shown in the first embodiment. Further, both the power feeding coil antenna and the power receiving coil antenna may be the coil antenna 101 having the structure shown in the first embodiment. In either case, the power feeding coil antenna and the power receiving coil antenna are mainly magnetically coupled, and power is transmitted mainly via the magnetic field.

  Thus, the coil antenna of the present invention can be used for both a power feeding coil antenna and a power receiving coil antenna.

  With this configuration, it is possible to realize a power feeding device, a power receiving device, and a wireless power supply system including a coil antenna with a small change in coupling strength due to a relative positional relationship with the counterpart coil antenna.

  In the present embodiment, an example in which a resonance circuit is configured by the capacitance component of the power reception circuit 310 and the inductance component of the power reception coil antenna Lr has been described. However, a resonance capacitor is connected in series to the power reception coil antenna Lr. Or you may connect in parallel.

  In the present embodiment, the coil antenna 101 having the structure shown in the first embodiment is the feeding coil antenna Lt and is directly connected (ohmic connection) to the feeding circuit 210. It is not limited. The coil antenna 101 having the structure shown in the first embodiment may be connected to the power feeding circuit 210 by electric field coupling or magnetic field coupling as a relay coil antenna. For example, a coupling coil directly connected to the power feeding circuit 210 and a power receiving coil antenna Lr connected to the power receiving circuit 310 are connected via a coil antenna 101P obtained by modifying the coil antenna 101 having the structure shown in the first embodiment. Thus, they may be connected to each other by electric field coupling or magnetic field coupling. The coil antenna 101P is a closed loop by directly connecting the first end (see T1 in FIG. 1) and the second end (see T2 in FIG. 1) of the coil antenna 101, or the first of the coil antenna 101. The end and the second end are connected via a capacitor to form a closed loop. That is, in the present invention, “electrically connected to the coil antenna” is not limited to a structure that is directly connected (ohmic connection) to the coil antenna, but includes a mode of connection by electric field coupling or magnetic field coupling.

<< Other Embodiments >>
In each of the embodiments described above, an example in which the two coil conductors run in parallel in the parallel running portion is shown, but the invention is not limited to this configuration. The “parallel running portion” in the present invention may be a portion in which two or more coil conductors run in parallel, and the parallel running portion may have, for example, three coil conductors running in parallel. When three or more coil conductors are wound side by side in parallel running parts, the inside and outside arrangements of all the plurality of coil conductors wound in parallel are replaced at the intersection. There may be. In the case where three or more coil conductors are wound in parallel, the parallel running portion has at least two inside / outside arrangements among the plurality of coil conductors wound in parallel. Thus, the effects and advantages of the present invention can be achieved.

  In each embodiment shown above, although the base material 1 showed the example which is a rectangular flat plate, it is not limited to this structure. The planar shape of the substrate 1 can be changed as appropriate, and may be, for example, circular, elliptical, polygonal, T-shaped, L-shaped, or the like. Moreover, the base material 1 is not limited to a flat plate, but may be a three-dimensional structure or the like. Moreover, the main surface of the base material 1 is not limited to a planar shape, and may be a curved surface or the like. As will be described in detail later, the substrate 1 is not essential in the coil antenna of the present invention.

  Moreover, in each embodiment shown above, although the example which forms a some coil conductor in the surface of the base material 1 and the example which forms a some coil conductor in the surface of the base material 1 and the back surface was shown, this structure is shown. It is not limited to. The plurality of coil conductors only need to have a parallel running portion that is wound in parallel when viewed from the Z-axis direction, and the plurality of coil conductors may be formed in multiple layers. The plurality of coil conductors may be formed on different base materials, for example. Moreover, the some coil conductor may be formed in each base material which comprises a laminated body.

  In each of the first, fifth, and sixth embodiments described above, an example in which the plurality of coil conductors is a rectangular spiral conductor pattern of about 3 turns has been described, but the present invention is not limited to this configuration. The outer shape of the plurality of coil conductors may be, for example, a circle, an ellipse, or a polygon. Further, the number of turns of the plurality of coil conductors can be changed as appropriate within the range where the effects and effects of the present invention are achieved. Furthermore, the plurality of coil conductors is not limited to a spiral shape, and may be a loop-shaped conductor pattern. The plurality of coil conductors provided in the coil antenna may be wound coils. That is, the base material is not essential in the coil antenna of the present invention. When the plurality of coil conductors are wound coils, they may be helical.

  Similarly, in each of the second and third embodiments described above, an example is shown in which a plurality of coil conductors are connected in series to form a rectangular spiral conductor pattern of about 3 turns. However, the present invention is not limited to this. It is not something. The outer shape of the plurality of coil conductors connected in series may be, for example, a circle, an ellipse, or a polygon. Further, the number of turns of the plurality of coil conductors connected in series can be changed as appropriate within the range where the operation and effect of the present invention are achieved. Furthermore, the plurality of coil conductors connected in series are not limited to a spiral shape, and may be a loop-shaped conductor pattern. A helical conductor pattern may be configured by laminating a base material on which a looped or spiral coil conductor is formed.

  Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

AX ... winding axis BE ... bridge part CR1, CR2, CR3, CR4, CR5, CR6, CR7, CR8, CR9, CR10, CR11, CR12, CR13, CR14 ... intersection C11 ... capacitors C21, C22 ... smoothing capacitor Ct ... Resonant capacitor D1... Diodes S1, S2... L1L, L1B, L2, L2A, L2B, L2J, L3, L4, L5, L6 between coil conductors, coil conductors PL, PL1, PL2, PL3, PLA, PLB. ... Parallel portions PR1, PR2, PR3 of a plurality of coil conductors ... Connection location Lr ... Power receiving coil antenna Lt ... Power feeding coil antenna PE1 ... First portion PE2 ... Second portion N1 ... Intersection per turn of the first portion Number of points N2 ... Number of intersecting points per turn of the second part R1 ... In the radial direction of the first part The distance R2 from the winding axis ... Distances Q1, Q2 from the winding axis in the radial direction of the second portion ... Switching element Ro ... Load T1 ... The first end T2 of the coil antenna ... The second ends V1a and V1b of the coil antenna , V2a, V2b ... interlayer connection conductor Vi ... DC input voltage Vo ... constant voltage 1 ... base material 101, 102, 103, 104, 105A, 105B, 106 ... coil antenna 201 ... feed device 210 ... feed circuit 211 ... inverter circuit 212 ... Drive circuit 213 ... Voltage regulator circuit 220 ... Resonant circuit 301 ... Power receiving device 310 ... Power receiving circuit 311 ... Rectifier smoothing circuit 312 ... Rectifier circuit 313 ... Voltage regulator circuit 320 ... Resonant circuit 401 ... Wireless power supply system

Claims (14)

A coil antenna used in a wireless power supply system,
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
A coil antenna in which at least two of the plurality of coil conductors have a crossing point in a parallel running portion as seen from the winding axis direction.   The coil antenna according to claim 1, wherein the plurality of coil conductors are wound in a spiral shape when viewed from the winding axis direction.   The coil antenna according to claim 2, wherein the number of the intersections per turn of the parallel running portion is one or more. The plurality of coil conductors include a first portion that is close in distance from the winding axis in the radial direction and a second portion that is farther from the winding axis in the radial direction than the first portion. And
The coil antenna according to claim 2 or 3, wherein a gap between the coil conductors adjacent to each other in the parallel running portion is smaller in the second portion than in the first portion. The plurality of coil conductors include a first portion that is close in distance from the winding axis in the radial direction and a second portion that is farther from the winding axis in the radial direction than the first portion. And
5. The coil antenna according to claim 2, wherein the number of the intersections per turn of the first part is smaller than the number of the intersections per turn of the second part.   The coil antenna according to any one of claims 1 to 5, wherein the intersection is separated in a direct current manner. A power feeding device in a wireless power supply system that wirelessly supplies power from a power feeding device to a power receiving device,
A coil antenna used for coupling with the power receiving device;
A power feeding circuit electrically connected to the coil antenna;
With
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing portion at a parallel running portion wound in parallel running as viewed from the winding axis direction.   The power feeding device according to claim 7, wherein the power feeding circuit applies an HF band alternating voltage to the coil antenna. A power receiving device in a wireless power supply system that wirelessly supplies power from a power feeding device to a power receiving device,
A coil antenna used for coupling with the power feeding device;
A power receiving circuit electrically connected to the coil antenna;
With
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing point at a parallel running portion wound in parallel running as viewed from the winding axis direction. A resonance circuit is configured by the capacitance component of the power reception circuit and the inductance component of the coil antenna.
The power receiving device according to claim 9, wherein a resonance frequency of the resonance circuit is an HF band frequency. In a wireless power supply system composed of a power feeding device and a power receiving device,
The power supply device
A coil antenna used for coupling with the power receiving device;
A power feeding circuit electrically connected to the coil antenna;
Have
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing point in a parallel running portion that is wound in parallel when viewed from the winding axis direction,
The wireless power supply system, wherein the power receiving device includes a coil antenna used for coupling with the power feeding device.   The wireless power supply system according to claim 11, wherein the power feeding circuit applies an HF band alternating voltage to the coil antenna. In a wireless power supply system composed of a power feeding device and a power receiving device,
The power receiving device is:
A coil antenna used for coupling with the power feeding device;
A power receiving circuit electrically connected to the coil antenna;
Have
The coil antenna is
A plurality of coil conductors wound around a winding axis and connected in parallel to each other;
At least two of the plurality of coil conductors have a crossing point in a parallel running portion that is wound in parallel when viewed from the winding axis direction,
The power feeding apparatus is a wireless power supply system including a coil antenna used for coupling with the power receiving apparatus. A resonance circuit is configured by the capacitance component of the power reception circuit and the inductance component of the coil antenna.
The wireless power supply system according to claim 13, wherein a resonance frequency of the resonance circuit is a frequency in an HF band.

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