JP2013005523A - Wireless power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, out of a wireless power supply method using a magnetic resonance based method instead of a conventional electromagnetic induction method, a method configured with a row of resonance coils on a flat plane could cause a coupling coefficient to be greatly varied by a slight change in the interval between the resonance coils, making characteristics adjustment in design or manufacturing difficult, and, hence, there existed virtually no example.SOLUTION: In a wireless power transmission device, power is transmitted without using electric conduction wire between various types of equipment. The wireless power transmission device includes a plurality of resonance coils which resonate at a prescribed frequency and are provided with conduction wire for resonance purpose. The plurality of resonance coils are arranged on a plane, and are provided with soft magnetic materials at positions where the electromagnetic field coupling of the resonance coils adjacent to each other is enhanced. Furthermore, coupling coils are provided which, in a plan view, embrace the abutting sides of adjacent resonance coils in circular form.

Description

  The present invention relates to a wireless power transmission apparatus that transmits electric power between various devices without using an electric conduction wire, and more particularly to a wireless power transmission apparatus based on a system using electromagnetic field coupling.

  Many portable devices such as mobile phones and personal digital assistants are used while incorporating a rechargeable secondary battery and periodically charging them. This charging is performed by connecting a wire with a dedicated connector connected to the portable device, or setting the portable device on a dedicated adapter, but it can be charged in a non-contact manner due to its inconvenience and annoyance. The demand for technology has increased. As a method for transmitting power in a non-contact manner, a method using electromagnetic induction as shown in Patent Document 1 and Patent Document 2 is common. However, the electromagnetic induction method has a very short distance between transmissions and is not easy to use. Therefore, in recent years, a method using magnetic resonance that can increase the transmission distance of electric power has attracted attention.

  As a wireless power supply method using magnetic resonance, Patent Document 3 (Conventional Example 3) proposes a wireless power supply system 900 as shown in FIG. A wireless power supply system 900 illustrated in FIG. 11 includes a power transmission device 901 including a power transmission resonance coil 912, a power source unit 911, and a control unit 916, and a power reception device 902 including a power reception resonance coil 922 and a power reception unit 921. Composed. A power transmission resonance coil 912 using a helical coil and a power reception resonance coil 922 using a helical coil are opposed to each other in the coil axial direction CD, and are transmitted and received as magnetic field energy using magnetic resonance. Further, even when a planar coil is used instead of a helical coil, it is common to transmit and receive the planar coils in the same manner as opposed to each other in the coil axis direction.

WO2008 / 032746 JP 11-95922 A JP 2010-239816 A

  By the way, when it is going to transmit electric power from several places on a plane as shown in patent documents 1 and patent documents 2 using a system using magnetic resonance instead of an electromagnetic induction system, composition like conventional example 3 The wireless power supply system 900 can be arranged side by side, or the resonance coils can be arranged in a plane and the adjacent resonance coils can be electromagnetically coupled to transmit from an arbitrary location. Will do.

  However, the method of arranging a number of wireless power supply systems 900 as in Conventional Example 3 is not practical because it is too expensive to manufacture. In addition, there is almost no conventional method for arranging resonance coils on a plane. This is because when coupling adjacent electromagnetic coils, electromagnetic coupling is performed using a parallel magnetic field, so the coupling coefficient changes greatly due to slight changes in the spacing between the resonant coils. This is because there is a problem that is difficult.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a wireless power transmission device that can strengthen electromagnetic field coupling between resonance coils arranged in a plane and can easily adjust characteristics.

  In order to solve this problem, a wireless power transmission device according to claim 1 of the present invention is a wireless power transmission device that transmits power without using an electrical conduction line between various devices, and resonates at a predetermined frequency. A plurality of resonance coils each having a conducting wire for resonance, the plurality of resonance coils being arranged in a plane, and a soft magnetic material provided at a position for strengthening electromagnetic coupling between the adjacent resonance coils It is characterized by having.

  The wireless power transmission device according to claim 2 of the present invention is characterized in that the resonance coil includes a spiral conductive wire and a capacitor that connects ends of the conductive wire.

  The wireless power transmission device according to claim 3 of the present invention is characterized in that each of the soft magnetic bodies is provided so as to overlap only two resonance coils in a plan view.

  The wireless power transmission device according to claim 4 of the present invention is characterized in that the outer peripheral shape of the conducting wire of each of the resonance coils is a polygon, and no soft magnetic material is provided at corner portions of the polygon. Yes.

  The wireless power transmission device according to claim 5 of the present invention is characterized in that the outer peripheral shape of the conducting wire of each resonance coil is a regular polygonal shape.

  The wireless power transmission device according to claim 6 of the present invention is characterized in that the regular polygon shape is a regular plane filling shape.

  The wireless power transmission device according to claim 7 of the present invention is characterized in that the outer peripheral shape of the conducting wire of each of the resonance coils is circular.

  The wireless power transmission device according to claim 8 of the present invention is characterized in that the resonance coil and the soft magnetic material are insulated.

  A wireless power transmission device according to claim 9 of the present invention is a wireless power transmission device that transmits power between various devices without using an electrical conduction wire, and resonates at a predetermined frequency. The plurality of resonance coils are arranged in a plane, and adjacent to the adjacent resonance coils in a plan view at a position where electromagnetic resonance between the adjacent resonance coils is performed. It is characterized in that a coupling coil is provided around the mating sides.

  The wireless power transmission device according to claim 10 of the present invention is characterized in that the resonance coil includes a spiral conductive wire and a capacitor that connects ends of the conductive wire.

  The wireless power transmission device according to claim 11 of the present invention is characterized in that the coupling coil is formed of a conductive wire connecting the switch and one end and the other end of the switch.

  The wireless power transmission apparatus according to claim 12 of the present invention is characterized in that the switch comprises a field effect transistor.

  The wireless power transmission device according to claim 13 of the present invention is characterized in that the outer peripheral shape of the conducting wire of each resonance coil is a regular polygonal shape.

  The wireless power transmission device according to claim 14 of the present invention is characterized in that the regular polygonal shape is a regular plane filling shape.

  The wireless power transmission device according to claim 15 of the present invention is characterized in that the outer peripheral shape of the conducting wire of each of the resonance coils is circular.

  According to the first aspect of the present invention, since the wireless power transmission device is provided with the soft magnetic material at the position where the electromagnetic coupling between the adjacent resonance coils is strengthened, the generated magnetic field can be strengthened and arranged in a plane. The electromagnetic field coupling between the resonance coils can be strengthened. As a result, even if the spacing between adjacent resonance coils varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced. Therefore, the characteristics can be easily adjusted, and the wireless power transmission device can be easily manufactured.

  According to the invention of claim 2, the wireless power transmission device can be easily resonated at a predetermined frequency because the resonance coil is composed of the spiral conductive wire and the capacitor. As a result, the electromagnetic field coupling between the resonant coils arranged in a plane can be reliably strengthened, and the characteristics can be easily adjusted.

  According to the invention of claim 3, in the wireless power transmission device, since each soft magnetic body is provided so as to overlap only two resonance coils, undesired electromagnetic coupling between adjacent resonance coils is further suppressed. Can do. As a result, the transmission efficiency can be further improved.

  According to the invention of claim 4, the wireless power transmission device suppresses undesired electromagnetic coupling between the adjacent resonance coils because the soft magnetic material is not provided at the polygonal corner of the conducting wire of each resonance coil. Can do. Thereby, transmission efficiency can be improved.

  According to the fifth aspect of the invention, since the outer peripheral shape of the conducting wire of each resonance coil is a regular polygonal shape, the wireless power transmission device can suppress variations in the spacing between adjacent resonance coils. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be strengthened more reliably, and the characteristics can be easily adjusted.

  According to the sixth aspect of the present invention, since the outer peripheral shape of the conducting wire of each resonance coil is a regular plane filling type, the resonance coil can be arranged efficiently and the spacing between adjacent resonance coils varies. Can be suppressed. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be more reliably strengthened, and the characteristics can be adjusted more easily.

  According to the seventh aspect of the invention, since the outer peripheral shape of the conducting wire of each resonance coil is circular, the wireless power transmission device can suppress variations in the spacing between adjacent resonance coils. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be strengthened more reliably, and the characteristics can be easily adjusted.

  According to the eighth aspect of the present invention, since the resonance coil and the soft magnetic material are insulated, the wireless power transmission device can use a soft magnetic material having conductivity. As a result, a soft magnetic material having a high magnetic flux density can be selected, so that the electromagnetic field coupling between the resonance coils arranged in a plane can be made stronger.

  According to the ninth aspect of the present invention, the wireless power transmission device is provided with the coupling coil at a position where the electromagnetic coupling between the adjacent resonance coils is performed, so that the electromagnetic coupling can be performed via the coupling coil. It is possible to strengthen the electromagnetic field coupling between the resonance coils arranged in a plane. As a result, even if the spacing between adjacent resonance coils varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced. Therefore, the characteristics can be easily adjusted, and the wireless power transmission device can be easily manufactured.

  According to the invention of claim 10, the wireless power transmission device can be easily resonated at a predetermined frequency because the resonance coil is composed of the spiral conductive wire and the capacitor. As a result, the electromagnetic field coupling between the resonant coils arranged in a plane can be reliably strengthened, and the characteristics can be easily adjusted.

  According to the eleventh aspect of the present invention, the wireless power transmission device includes the coupling coil including the conductive wire and the switch connecting the one end and the other end of the conductive wire, so that the transmission path can be arbitrarily set by turning the switch ON / OFF. Can be decided. This can suppress undesired electromagnetic field coupling between adjacent resonance coils and improve transmission efficiency.

  According to the twelfth aspect of the present invention, since the switch is made of a field effect transistor in the wireless power transmission device, a switch structure that can be reduced in size with simple wiring is obtained. This facilitates manufacturing of the wireless power transmission device.

  According to the invention of claim 13, since the outer peripheral shape of the conducting wire of each resonance coil is a regular polygonal shape, the wireless power transmission device can suppress variations in the spacing between adjacent resonance coils. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be strengthened more reliably, and the characteristics can be easily adjusted.

  According to the invention of claim 14, in the wireless power transmission device, since the outer peripheral shape of the conducting wire of each resonance coil is a regular plane filling type, the resonance coils can be arranged efficiently and the spacing between adjacent resonance coils varies. Can be suppressed. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be more reliably strengthened, and the characteristics can be adjusted more easily.

  According to the fifteenth aspect of the present invention, since the outer peripheral shape of the conducting wire of each resonance coil is circular, the wireless power transmission device can suppress variations in the spacing between adjacent resonance coils. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be strengthened more reliably, and the characteristics can be easily adjusted.

  Therefore, the wireless power transmission device of the present invention can provide a wireless power transmission device that can strengthen electromagnetic field coupling between resonance coils arranged in a plane and can easily adjust characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram explaining the wireless power transmission apparatus of 1st Embodiment of this invention, Comprising: It is a top view. It is a block diagram explaining the wireless power transmission apparatus of 1st Embodiment of this invention, Comprising: It is sectional drawing in the II-II line | wire shown in FIG. It is a block diagram explaining the wireless power transmission apparatus of 2nd Embodiment of this invention, Comprising: It is a top view. It is a block diagram explaining the wireless power transmission apparatus of 2nd Embodiment of this invention, Comprising: It is sectional drawing in the IV-IV line | wire shown in FIG. It is a block diagram explaining the wireless power transmission apparatus of 3rd Embodiment of this invention, Comprising: It is a top view. It is a block diagram explaining the wireless power transmission apparatus of 3rd Embodiment of this invention, Comprising: It is sectional drawing in the VI-VI line shown in FIG. It is the block diagram explaining the wireless power transmission apparatus of 3rd Embodiment of this invention, Comprising: It is the top view which showed the resonance coil. It is a block diagram explaining the wireless power transmission apparatus of 3rd Embodiment of this invention, Comprising: It is the top view which showed the coupling coil. It is the block diagram explaining the modification 1 in the coordinate input device of embodiment of this invention, Comprising: It is the top view which showed the resonance coil. It is the block diagram explaining the modification 2 in the coordinate input device of embodiment of this invention, Comprising: It is the top view which showed the resonance coil. It is a figure which shows an example of a structure of the wireless power supply system in the prior art example 3. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a configuration diagram illustrating a wireless power transmission apparatus 101 according to the first embodiment of this invention. FIG. 2 is a configuration diagram illustrating the wireless power transmission apparatus 101 according to the first embodiment of the present invention, and is a cross-sectional view taken along the line II-II shown in FIG.

  As shown in FIGS. 1 and 2, the wireless power transmission device 101 according to the first embodiment of the present invention includes a plurality of resonance coils 11, a plurality of soft magnetic bodies 15, and a resonance coil 11 and soft magnetic bodies 15. The substrate 19 is formed.

  As shown in FIGS. 1 and 2, the resonance coil 11 is provided on a base material 19 to be described later, and includes a spiral conductive wire 12 and a capacitor 13 that connects ends of the conductive wire 12. It is formed so as to resonate at the frequency F1. Further, the plurality of resonance coils are arranged in a plane on the base material 19.

  Moreover, the conducting wire 12 is made of a conductive material, for example, preferably using copper or a copper alloy, and as shown in FIG. 1, the outer circumferential shape of the conducting wire 12 is formed to be a square. In addition, although copper or a copper alloy was used suitably as the material of the conducting wire 12, other conductive materials may be used, for example, silver or a silver alloy, nickel or a nickel alloy, aluminum or an aluminum alloy, or the like.

  In addition, the capacitor 13 is preferably mounted with a solder HD as shown in FIG. 2 so as to connect the ends of the conductive wire 12 suitably using a multilayer ceramic chip capacitor which is generally widely used. Although a multilayer ceramic chip capacitor is suitably used for the capacitor 13, a composite capacitor using an inorganic or organic dielectric film may be used.

  In this way, the inductance L of the spiral conductor 12 and the capacitance C of the capacitor 13 are easily resonated at a predetermined frequency F1 using an LC resonance circuit (F = 1 / (2π√ (LC))). be able to.

  The soft magnetic body 15 is made of an insulating material, for example, using a ferrite material, and is disposed at a position where the electromagnetic coupling between the adjacent resonance coils 11 is strengthened as shown in FIG. For this reason, the generated magnetic field can be increased, and the electromagnetic field coupling between the resonance coils 11 arranged in a plane can be increased. In particular, the wireless power transmission apparatus 101 of the present invention shown in FIG. 1 has a configuration in which each soft magnetic body 15 is provided so as to overlap only two resonance coils 11 in plan view (plan view of FIG. 1). It has become. Therefore, the soft magnetic body 15 is not provided in the corner portion of the square. For this reason, undesired electromagnetic field coupling between the adjacent resonance coils 11 can be further suppressed. In addition, although the ferrite type material was used for the soft magnetic body 15, it should just be an insulating soft magnetic material and is not restricted to a ferrite type material.

  The base material 19 is made of glass-filled epoxy resin, and a generally-known single-sided printed wiring board (PCB) is used to connect a metal foil such as copper (Cu) provided on the printed wiring board to the conductive wire 12. In order to obtain the wiring pattern, a conductive wire 12 is formed and used as a base material. Instead of the printed wiring board on one side, a flexible printed wiring board (FPC) made of a material such as polyimide resin (PI) may be used as the base material.

  When power is transmitted to the wireless power transmission apparatus 101 configured as described above, for example, by a method using electromagnetic coupling to the resonance coil 11A shown in FIG. Electric power is transmitted to the adjacent resonance coil 11B in which the field coupling is strengthened. Similarly, power is sequentially transmitted from the resonance coil 11B to the resonance coil 11C, from the resonance coil 11C to the resonance coil 11D, and from the resonance coil 11D to the resonance coil 11E. When a resonance body (not shown) that is electromagnetically coupled to the resonance coil 11E is brought close to the resonance coil 11E, electric power is transmitted to the resonance body by electromagnetic field coupling. In this way, the power transmitted to the resonance coil 11A is transmitted to the resonator by the wireless power transmission device 101. The above transmission path is an example of a transmission path. For example, power is transmitted from the resonance coil 11A to the adjacent resonance coil 11F in which electromagnetic coupling between the coils is strengthened by the soft magnetic body 15, and different transmission paths. In some cases, power is transmitted to the resonance coil 11E through the coil.

  Conventionally, in this transmission, if the distance between the adjacent resonance coils 11 is too close, the coupling coefficient is too strong and the transmission characteristics cannot be optimized. Conversely, if the distance is too far, the electromagnetic field coupling is too weak. Again, transmission characteristics could not be optimized. For this reason, it is necessary to arrange the distances between the resonant coils 11 apart to some extent, but the coupling coefficient changes greatly due to a slight change in the distance between the resonant coils 11, and similarly, the transmission characteristics are optimized. I could not.

  The wireless power transmission apparatus 101 of the present invention strengthens electromagnetic coupling between the resonance coils 11 by disposing the soft magnetic body 15 between the resonance coils 11 that are arranged with a certain distance between the resonance coils 11. The change in the coupling coefficient due to the variation in the spacing between the resonance coils 11 can be reduced. As a result, even if the spacing between adjacent resonance coils 11 varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced, so that the characteristics can be easily adjusted, and the wireless power transmission apparatus 101 can be manufactured easily. Become.

  Moreover, since the outer periphery shape of the conducting wire 12 is a regular polygonal square, it is possible to suppress variations in the spacing between the adjacent resonance coils 11. As a result, the electromagnetic field coupling between the resonant coils 11 arranged in a plane can be more reliably strengthened, and the characteristics can be adjusted more easily.

  Furthermore, since the outer peripheral shape of the conducting wire 12 is a regular polygonal shape filled in a regular plane, the resonance coil 11 can be arranged efficiently, and variations in the spacing between adjacent resonance coils 11 can be suppressed. As a result, the electromagnetic field coupling between the resonance coils arranged in a plane can be more reliably strengthened, and the characteristics can be adjusted more easily.

  As described above, the wireless power transmission apparatus 101 according to the present invention is provided with the soft magnetic body 15 at a position where the electromagnetic coupling between the adjacent resonance coils 11 is strengthened. The electromagnetic field coupling between the resonance coils 11 can be strengthened. As a result, even if the distance between adjacent resonance coils 11 varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced. Therefore, the characteristics can be easily adjusted, and the wireless power transmission apparatus 101 can be easily manufactured.

  In addition, since the resonance coil 11 includes the spiral conductive wire 12 and the capacitor 13, it can be easily resonated at a predetermined frequency F1. As a result, the electromagnetic field coupling between the resonance coils 11 arranged in a plane can be surely strengthened, and the characteristics can be easily adjusted.

  In addition, since each soft magnetic body 15 is provided so as to overlap only two resonance coils 11, undesired electromagnetic coupling between adjacent resonance coils 11 can be further suppressed. As a result, the transmission efficiency can be further improved.

  In addition, since the soft magnetic body 15 is not provided at the polygonal corner of the conducting wire 12 of each resonance coil 11, undesired electromagnetic coupling between the adjacent resonance coils 11 can be suppressed. Thereby, transmission efficiency can be improved.

  Moreover, since the outer periphery shape of the conducting wire 12 of each resonance coil 11 is a regular polygon shape, the dispersion | variation in the space | interval between the adjacent resonance coils 11 can be suppressed. As a result, the electromagnetic field coupling between the resonant coils 11 arranged in a plane can be more reliably strengthened, and the characteristics can be adjusted more easily.

  Moreover, since the outer periphery shape of the conducting wire 12 of each resonance coil 11 is a regular plane filling type, the resonance coil 11 can be arranged efficiently and the variation in the space between the adjacent resonance coils 11 can be suppressed. As a result, the electromagnetic field coupling between the resonant coils 11 arranged in a plane can be more reliably increased, and the characteristics can be adjusted more easily.

[Second Embodiment]
FIG. 3 is a configuration diagram illustrating the wireless power transmission apparatus 102 according to the second embodiment of this invention. FIG. 4 is a configuration diagram illustrating the wireless power transmission apparatus 102 according to the second embodiment of the present invention, and is a cross-sectional view taken along line IV-IV shown in FIG. 3. The wireless power transmission apparatus 102 according to the second embodiment is different from the first embodiment in that an insulator 79 is provided. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 3 and 4, the wireless power transmission apparatus 102 according to the second embodiment of the present invention includes a plurality of resonance coils 11, a plurality of soft magnetic bodies 25, a resonance coil 11, and a soft magnetic body 25. An insulator 79 for insulation and a base material 19 on which the resonance coil 11, the soft magnetic body 25, and the insulator 79 are formed are configured.

  The insulator 79 is made of an insulating material. For example, an organic material is used so that the resonance coil 11 and the soft magnetic body 25 are insulated on the base material 19 as shown in FIGS. 3 and 4. In addition, it is formed in a pattern. The insulator 79 is formed by, for example, screen printing, and a material such as a thermosetting resist that can be printed is preferably used.

  The soft magnetic body 25 is made of a material mainly composed of iron, for example, permalloy (Fe—Ni alloy), and is disposed at a position that strengthens electromagnetic coupling between adjacent resonance coils 11 as shown in FIG. Yes. For this reason, the generated magnetic field can be increased, and the electromagnetic field coupling between the resonance coils 11 arranged in a plane can be increased. Further, since the resonant coil 11 and the soft magnetic body 25 are insulated by the insulator 79, the conductive soft magnetic body 25 can be used. As a result, a soft magnetic material having a high magnetic flux density can be selected, so that the electromagnetic field coupling between the resonance coils 11 arranged in a plane can be made stronger. Although permalloy (Fe—Ni alloy) is used for the soft magnetic body 25, any soft magnetic material may be used, such as Sendust (Fe—Si—Al alloy), which is another iron-based material, or a non-ferrous amorphous magnetic alloy. Etc.

  As described above, the wireless power transmission apparatus 102 according to the present invention is provided with the soft magnetic body 25 at a position where the electromagnetic field coupling between the adjacent resonance coils 11 is strengthened. The electromagnetic field coupling between the resonance coils 11 can be strengthened. As a result, even if the distance between adjacent resonance coils 11 varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced. Therefore, the characteristics can be easily adjusted, and the wireless power transmission apparatus 102 can be easily manufactured.

  Further, since the resonant coil 11 and the soft magnetic body 25 are insulated by the insulator 79, the conductive soft magnetic body 25 can be used. As a result, a soft magnetic material having a high magnetic flux density can be selected, so that the electromagnetic field coupling between the resonance coils 11 arranged in a plane can be made stronger.

[Third Embodiment]
FIG. 5 is a configuration diagram illustrating the wireless power transmission apparatus 103 according to the third embodiment of this invention. FIG. 6 is a configuration diagram illustrating the wireless power transmission apparatus 103 according to the third embodiment of the present invention, and is a cross-sectional view taken along line VI-VI shown in FIG. FIG. 7 is a configuration diagram illustrating the wireless power transmission apparatus 103 according to the third embodiment of the present invention, and is a plan view illustrating the resonance coil 11. FIG. 8 is a configuration diagram illustrating the wireless power transmission apparatus 103 according to the third embodiment of the present invention, and is a plan view illustrating the coupling coil 36. The wireless power transmission apparatus 103 according to the third embodiment is different from the first embodiment in that a coupling coil 36 is provided. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 5 to 8, the wireless power transmission apparatus 103 according to the third embodiment of the present invention includes a plurality of resonance coils 11, a base material 19 on which the resonance coils 11 are formed, and a plurality of coupling coils 36. And an insulating base material 39 on which the coupling coil 36 is formed.

  As shown in FIGS. 5 to 8, the coupling coil 36 is provided on an insulating base 39 to be described later, and includes a switch 38 and a conductive wire 37 connecting one end and the other end of the switch 38. The electromagnetic resonance coupling between the adjacent resonance coils 11 is performed. Further, the coupling coil 36 is provided so as to wrap around the adjacent sides of the adjacent resonance coils 11 in plan view (plan view of FIG. 5). For this reason, electromagnetic field coupling can be performed via the coupling coil 36, and electromagnetic field coupling between the resonance coils 11 arranged in a plane can be strengthened.

  Further, the conductive wire 37 is made of a conductive material, for example, preferably using copper or a copper alloy, and is provided so as to wrap around the adjacent sides of the adjacent resonance coils 11 as shown in FIG. It has been. Although copper or a copper alloy is preferably used as the material of the conductive wire 37, other conductive materials may be used, for example, silver or a silver alloy, nickel or a nickel alloy, aluminum or an aluminum alloy, or the like.

  Further, the switch 38 is preferably soldered and mounted so as to connect one end and the other end of the conductive wire 37 as shown in FIG. 8 using a field effect transistor (FET). Yes. For this reason, a switch structure that can be reduced in size with simple wiring is obtained. Although a field effect transistor is preferably used for the switch 38, a mechanical push switch or the like may be used. For ease of explanation, the wiring pattern to the switch 38 is omitted.

  By turning on the switch 38, electromagnetic field coupling can be performed via the coupling coil 36, and electromagnetic field coupling between the resonance coils 11 arranged in a plane can be strengthened. Further, by turning off the switch 38, it is possible to weaken electromagnetic coupling between the resonance coils 11 arranged in a plane as compared with the case where the switch 38 is turned on. In this way, by turning on / off the switch 38, the strength of electromagnetic coupling between the resonance coils 11 can be arbitrarily determined.

  The insulating base 39 is made of polyimide resin (PI), and a metal foil such as copper (Cu) provided on the flexible printed wiring board using a widely known single-sided flexible printed wiring board (FPC). Are patterned so as to obtain a pattern of the conductive line 37 and a wiring pattern (not shown) to the switch 38 to form a conductive line 37 and a wiring pattern (not shown), and an insulating substrate. It is said. Further, as shown in FIG. 8, the insulating base 39 is provided with a plurality of holes 59 corresponding to the positions of the capacitors 13 shown in FIG. Instead of a single-sided flexible printed wiring board (FPC), a conductive plate having a binder resin and a conductive member is applied to a film substrate such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate). It may be produced by using a method of printing, drying and solidifying.

  As shown in FIG. 6, the base material 19 provided with the resonance coil 11 shown in FIG. 7 and the insulating base material 39 provided with the coupling coil 36 shown in FIG. So that they can be put together and bonded together with an adhesive AD or the like. In this way, the wireless power transmission device 103 shown in FIG. 5 is manufactured.

  When power is transmitted to the wireless power transmission apparatus 103 configured as described above, for example, by a method using electromagnetic coupling to the resonance coil 11A shown in FIG. 5, the coupling coil 36F in which the switch 38 is turned on. Thus, electromagnetic field coupling between the resonance coils is strengthened, and power is transmitted to the adjacent resonance coil 11F. At this time, the switch 38 of the coupling coil 36B provided between the resonance coil 11A and another adjacent resonance coil 11B is turned off.

  Similarly, the coupling coil 36G, the coupling coil 36D, and the coupling coil are sequentially transmitted from the resonance coil 11F to the resonance coil 11G, from the resonance coil 11G to the resonance coil 11D, and from the resonance coil 11D to the resonance coil 11E. The switch 38 of 36E is turned on. Further, the switch 38 of the coupling coil 36 in the transmission path other than the above is turned off. When a resonance body (not shown) that is electromagnetically coupled to the resonance coil 11E is brought close to the resonance coil 11E, electric power is transmitted to the resonance body by electromagnetic field coupling. In this way, the power transmitted to the resonance coil 11A is transmitted to the resonator by the wireless power transmission device 101. The transmission path is an example of the transmission path, and the transmission path can be arbitrarily determined by turning on / off the switch 38 of the coupling coil 36.

  As described above, the wireless power transmission apparatus 103 according to the present invention performs the electromagnetic field coupling through the coupling coil 36 because the coupling coil 36 is provided at a position where the adjacent resonant coils 11 perform electromagnetic field coupling. The electromagnetic field coupling between the resonance coils 11 arranged in a plane can be strengthened. As a result, even if the distance between adjacent resonance coils 11 varies somewhat due to manufacturing errors during manufacturing, the change in coupling characteristics can be reduced. Therefore, the characteristics can be easily adjusted, and the wireless power transmission device 103 can be easily manufactured.

  Further, since the coupling coil 36 includes the conductive wire 37 and the switch 38 that connects one end and the other end of the conductive wire 37, the transmission path can be arbitrarily determined by turning the switch 38 ON / OFF. As a result, undesired electromagnetic coupling between adjacent resonance coils 11 can be suppressed, and transmission efficiency can be improved.

  Further, since the switch 38 is made of a field effect transistor (FET), a switch structure that can be reduced in size with simple wiring is obtained. This makes it easy to manufacture the wireless power transmission apparatus 103.

  In addition, this invention is not limited to the said embodiment, For example, it can deform | transform and implement as follows, These embodiments also belong to the technical scope of this invention.

<Modification 1>
FIG. 9 is a configuration diagram illustrating a first modification of the coordinate input device according to the embodiment of the present invention, and is a plan view illustrating the resonance coil 21.
In the above embodiment, the outer peripheral shape of the conducting wire 12 of the resonance coil 11 is configured to be a square. However, as shown in FIG. 9, the outer peripheral shape of the conducting wire 22 of the resonance coil 21 may be circular. .

<Modification 2>
FIG. 10 is a configuration diagram illustrating a second modification of the coordinate input device according to the embodiment of the present invention, and is a plan view illustrating the resonance coil 31.
In the above embodiment, the outer peripheral shape of the conducting wire 12 of the resonance coil 11 is configured to be a regular plane-filled square. However, as shown in FIG. 10, the outer peripheral shape of the conducting wire 32 of the resonance coil 31 is the same positive. It may be a plane-filled regular hexagon. In addition, the same regular plane filling regular triangle may be used.

<Modification 3>
In the above embodiment, the outer peripheral shape of the conducting wire 12 of the resonance coil 11 is configured to be a regular polygonal square. However, the outer peripheral shape of the conducting wire of the resonance coil may be a regular pentagon having the same regular polygon shape. . In addition, it may be a regular octagon having the same regular polygon shape.

<Modification 4>
In the above embodiment, the resonance coil 11 is constituted by the conducting wire 12 and the capacitor 13. However, the resonance coil 11 may be constituted by only the conducting wire 12 without the capacitor 13.

<Modification 5>
In the first embodiment and the second embodiment, each soft magnetic body 15 is provided so as to overlap only the two resonance coils 11 in a plan view. Some may be connected.

<Modification 6>
In the second embodiment, the insulator 79 is configured such that a material such as a thermosetting resist that can be printed is selected and formed into a pattern by screen printing. However, instead of the insulator 79, a resonance coil is used. An insulating film sheet may be bonded to the base material 19 so as to cover 11.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the object of the present invention.

11, 21, 31, 11A, 11B, 11C, 11D, 11E, 11F, 11G Resonant coil 12, 22, 32 Conductor 13 Capacitor 15, 25 Soft magnetic material 36, 36B, 36D, 36E, 36F, 36G Coupling coil 37 Conductive Line 38 Switch 101, 102, 103 Wireless power transmission device F1 Predetermined frequency

Claims (15)

A wireless power transmission device that transmits power without using an electric conduction wire between various devices,
Resonating at a predetermined frequency, and having a plurality of resonance coils with conducting wires for resonance,
The plurality of resonance coils are arranged in a plane,
A wireless power transmission device, characterized in that a soft magnetic material is provided at a position where electromagnetic coupling between adjacent resonance coils is strengthened.   The wireless power transmission device according to claim 1, wherein the resonance coil includes a spiral conductive wire and a capacitor that connects ends of the conductive wire.   The wireless power transmission device according to claim 2, wherein each soft magnetic body is provided so as to overlap only two resonance coils in a plan view. The outer periphery shape of the conducting wire of each of the resonance coils is a polygon,
The wireless power transmission device according to claim 2, wherein no soft magnetic material is provided at a corner portion of the polygon.   The wireless power transmission device according to any one of claims 2 to 4, wherein an outer peripheral shape of the conducting wire of each of the resonance coils is a regular polygonal shape.   The wireless power transmission apparatus according to claim 5, wherein the regular polygon shape is a regular plane filling shape.   4. The wireless power transmission device according to claim 2, wherein an outer peripheral shape of the conducting wire of each of the resonance coils is a circular shape. 5.   The wireless power transmission device according to claim 1, wherein the resonance coil and the soft magnetic body are insulated. A wireless power transmission device that transmits power without using an electric conduction wire between various devices,
Resonating at a predetermined frequency, and having a plurality of resonance coils with conducting wires for resonance,
The plurality of resonance coils are arranged in a plane,
A radio in which a coupling coil that circulates around the adjacent sides of the adjacent resonance coils in a plan view is provided at a position where electromagnetic coupling between the adjacent resonance coils is performed. Power transmission device.   The wireless power transmission device according to claim 9, wherein the resonance coil includes a spiral conductive wire and a capacitor that connects ends of the conductive wire.   The wireless power transmission device according to claim 9 or 10, wherein the coupling coil includes a switch and a conductive wire that connects one end and the other end of the switch.   The wireless power transmission apparatus according to claim 11, wherein the switch includes a field effect transistor.   The wireless power transmission device according to any one of claims 10 to 12, wherein an outer peripheral shape of the conducting wire of each resonance coil is a regular polygonal shape.   The wireless power transmission device according to claim 13, wherein the regular polygon shape is a regular plane filling shape.   The wireless power transmission device according to any one of claims 10 to 12, wherein an outer peripheral shape of the conducting wire of each of the resonance coils is a circular shape.