Non-contact power supply system

Abstract

A non-contact power feeding system includes a power transmitter (100) having a first capacitor (116) and a power transmitting coil (112) and having a first resonance frequency, a power receiver (205) having a second capacitor (216) and a power receiving coil (212) and having a second resonance frequency, and a repeater (270) that transmits AC power received from the power transmitting coil to the power receiving coil. The repeater includes a repeater power receiving coil portion (250) for receiving the AC power and including at least one coil that determines a first parasitic capacitance (257) for forming a frequency identical to the first resonance frequency, i.e., a first self-resonance frequency, and a repeater power transmitting coil portion (260) for transmitting the AC power and including at least one coil that determines a second parasitic capacitance (267) for forming a frequency identical to the second resonance frequency, i.e., a second self-resonance frequency.

Description

[0001] Citation of relevant applications

[0002] This application is based on Japanese Patent Application No. 2019-224374, filed on December 12, 2019, the contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a contactless power supply system. Background Technology

[0004] Electric vehicles are known to supply power from a power supply coil disposed on the road surface to a power receiving coil on the vehicle side in a non-contact manner. In such electric vehicles, the following technique is known: in order to improve power transmission efficiency, a repeater is included at a location between the power supply coil and the power receiving coil in the vehicle, the repeater having a resonant circuit using coils and capacitors (e.g., International Publication No. 2011 / 108403). Summary of the Invention

[0005] In such repeaters, there is a need to miniaturize the overall device and increase the freedom of deployment to vehicles and roads.

[0006] This disclosure can be implemented in the following ways.

[0007] According to one aspect of this disclosure, a contactless power supply system for a vehicle is provided. The contactless power supply system includes: a power transmitter having a first capacitor and a power transmission coil for transmitting alternating current (AC), and having a first resonant frequency determined by the power transmission coil and the first capacitor; a power receiver having a second capacitor and a power receiving coil for receiving AC, and having a second resonant frequency determined by the power receiving coil and the second capacitor; and a repeater for transmitting AC power received from the power transmission coil to the power receiving coil. The repeater includes: a repeater power receiving coil section for receiving AC power transmitted from the power transmission coil, and including at least one coil for determining a first parasitic capacitance for forming a first self-resonant frequency, which is the same frequency as the first resonant frequency; and a repeater power transmission coil section for transmitting AC power to the power receiver, and including at least one coil for determining a second parasitic capacitance for forming a second self-resonant frequency, which is the same frequency as the second resonant frequency.

[0008] The contactless power supply system according to this method includes a repeater that transmits AC power received from a transmitting coil to a receiving coil. The receiving coil section of the repeater determines a first parasitic capacitance for forming a first self-resonant frequency, which is the same frequency as a first resonant frequency, using at least one coil. The transmitting coil section determines a second parasitic capacitance for forming a second self-resonant frequency, which is the same frequency as a second resonant frequency, using at least one coil. Therefore, the repeater can receive AC power from a transmitting device and transmit AC power to a receiving device without the need for capacitors. Thus, the repeater can be miniaturized, and the flexibility in its configuration can be increased. Attached Figure Description

[0009] The above-mentioned objects, other objects, features, and advantages of this disclosure will become clearer with reference to the accompanying drawings and the following detailed description. The accompanying drawings are described below.

[0010] Figure 1 This is an explanatory diagram showing the structure of a contactless power supply system.

[0011] Figure 2 This is an explanatory diagram showing the circuit structure of a contactless power supply system.

[0012] Figure 3 This is an explanatory diagram showing the structure of the coil contained in the repeater.

[0013] Figure 4 yes Figure 3 A cross-sectional view at position IV-IV.

[0014] Figure 5 yes Figure 3 A cross-sectional view at the VV position.

[0015] Figure 6 This is an explanatory diagram showing the structure of the repeater coil in the second embodiment.

[0016] Figure 7 yes Figure 6 A sectional view at position VII-VII.

[0017] Figure 8 This is an explanatory diagram showing the circuit structure of the contactless power supply system according to the second embodiment.

[0018] Figure 9 This is a diagram showing the structure of the relay receiving coil section in other embodiments.

[0019] Figure 10 This is a diagram showing the structure of the relay receiving coil section in other embodiments.

[0020] Figure 11This is a diagram showing the structure of the relay receiving coil section in other embodiments. Detailed Implementation

[0021] A. First implementation method:

[0022] use Figure 1 and Figure 2 The structure of the contactless power supply system 300 of this embodiment will be described. For example... Figure 1 As shown, the contactless power supply system 300 of this embodiment is a system capable of supplying power to a vehicle 200 from a power transmitter 100 in a contactless manner. The contactless power supply system 300 includes: a power transmitter 100, which is disposed on a road RS; a receiver 205, which is installed in the vehicle 200; and a repeater 270, which receives AC power from the power transmitter 100 and supplies power to the receiver 205.

[0023] The power supply 100 includes a power supply resonant circuit 110, a power supply circuit 120, and a power supply circuit 130. The power supply resonant circuit 110, power supply circuit 120, and power supply circuit 130 are embedded within the road RS. Multiple power supply resonant circuits 110 and 120 are included and are continuously arranged along the extension direction of the road RS, which is the travel direction of the vehicle 200. The power supply circuit 120 and power supply circuit 130 do not need to be embedded within the road RS; for example, they can be positioned on the road RS at locations that will not adversely affect the movement of the vehicle 200. Preferably, the power supply circuit 120 and power supply circuit 130 are located near the power supply resonant circuit 110.

[0024] The power supply circuit 130 supplies DC power to the power transmission circuit 120. The power transmission circuit 120 is an AC conversion circuit with an inverter circuit and a filter circuit. The power transmission circuit 120 converts the DC power supplied from the power supply circuit 130 into high-frequency AC power and supplies it to the power transmission resonant circuit 110.

[0025] The power transmission resonant circuit 110 transmits the alternating current induced in the power transmission coil 112 using electromagnetic induction to the relay receiving coil section 250 of the repeater 270. For example... Figure 2 As shown, the power transmission resonant circuit 110 includes a power transmission coil 112 and a first capacitor 116 that functions as a resonant capacitor. Hereinafter, the resonant frequency determined by the capacitance of the first capacitor 116 and the self-inductance of the power transmission coil 112 is referred to as the first resonant frequency.

[0026] Vehicle 200, for example, consists of vehicles equipped with drive motors, such as electric vehicles and hybrid vehicles. Figure 1As shown, vehicle 200 includes repeater 270, receiver 205 and battery 230. Receiver 205 has a receiving resonant circuit 210 and a receiving circuit 220.

[0027] like Figure 2 As shown, the power receiving resonant circuit 210 includes a power receiving coil 212 and a second capacitor 216 that functions as a resonant capacitor. The power receiving resonant circuit 210 receives alternating current induced in the relay transmission coil section 260 of the repeater 270 from the power receiving coil 212. Hereinafter, the resonant frequency determined by the capacitance of the second capacitor 216 and the self-inductance of the power receiving coil 212 is also referred to as the second resonant frequency.

[0028] The receiving circuit 220 converts the AC power output from the receiving resonant circuit 210 into DC power. The receiving circuit 220 includes, for example, a filter circuit, a rectifier circuit for converting AC power to DC power, and a power conversion circuit for converting DC power suitable for charging the battery 230 as a load. The battery 230 is a secondary battery that outputs DC power to drive a drive motor, which is the drive source of the vehicle 200. The DC power output from the receiving circuit 220 can be used to charge the battery 230. The DC power from the receiving circuit 220 is used for charging an auxiliary battery (not shown), driving a drive motor, or driving auxiliary devices.

[0029] Repeater 270 transmits the AC power received from the transmitting resonant circuit 110 to the receiving resonant circuit 210. For example... Figure 1 As shown, the repeater 270 includes: a repeater receiving coil section 250, which receives AC power supplied from the transmitting coil 112; and a repeater transmitting coil section 260, which supplies AC power to the receiver 205.

[0030] like Figure 3 As shown, in this embodiment, the relay receiving coil section 250 includes two coils: a first relay receiving coil 251 and a second relay receiving coil 252. The relay transmitting coil section 260 includes two coils: a first relay transmitting coil 261 and a second relay transmitting coil 262. The first relay receiving coil 251 and the second relay receiving coil 252, as well as the first relay transmitting coil 261 and the second relay transmitting coil 262, have a generally flat shape and are formed by repeatedly winding copper wires with a generally rectangular cross-sectional shape. The first relay receiving coil 251 and the second relay receiving coil 252, as well as the first relay transmitting coil 261 and the second relay transmitting coil 262, can be obtained, for example, by resin molding a component after cutting a copper plate into a coil shape.

[0031] In this embodiment, such as Figure 3As shown, repeater 270 includes coils in a so-called open-circuit configuration. More specifically, one end 251T1 of the first relay receiving coil 251 and one end 261T1 of the first relay sending coil 261 are electrically connected via wiring C1. The other ends 251T2 of the first relay receiving coil 251 and the first relay sending coil 261 are open. One end 252T1 of the second relay receiving coil 252 and one end 262T1 of the second relay sending coil 262 are electrically connected via wiring C2. The other ends 252T2 of the second relay receiving coil 252 and the second end 262T2 of the second relay sending coil 262 are open.

[0032] like Figure 3 As shown, the first relay receiving coil 251 is a coil wound to the right from the coil center, starting from one end 251T1 located on the outer periphery of the coil and electrically connected to the first relay sending coil 261. The second relay receiving coil 252 is a coil wound to the left from the coil center, starting from one end 252T1 located on the outer periphery of the coil and electrically connected to the second relay sending coil 262. Alternatively, the second relay receiving coil 252 can be a coil wound to the right from one end 252T1 towards the coil center. The structures of the coils in the first and second relay receiving coils 251 and 252 can also be reversed. More specifically, the first relay receiving coil 251 is a coil wound to the left from the coil center, starting from one end 251T1 located on the outer periphery of the coil and electrically connected to the first relay sending coil 261, and the second relay receiving coil 252 is a coil wound to the right from the coil center, starting from one end 252T1 located on the outer periphery of the coil and electrically connected to the second relay sending coil 262. The combination of the coil structure of the relay receiving coil section 250, including the first relay receiving coil 251 and the second relay receiving coil 252, is also referred to as the "first combination".

[0033] The first relay receiving coil 251 and the second relay receiving coil 252 are positioned opposite each other with their surfaces parallel and their axes aligned at the lower part of the vehicle 200. The first relay receiving coil 251 is positioned further down the vehicle 200 than the second relay receiving coil 252, i.e., on the side of the power supply coil 100. The first relay receiving coil 251 and the second relay receiving coil 252 function as resonant coils for magnetic resonance with the power supply coil 112.

[0034] In the first relay receiving coil 251, such as Figure 4As shown, the width W1 of the vertical cross-section of the conductor wiring constituting the coil is greater than the thickness T1. The distance L1 between the conductor wiring of the first relay receiving coil 251 is greater than the distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252. The distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252 refers to the shortest distance between them. The second relay receiving coil 252 is also constructed in the same manner as the first relay receiving coil 251.

[0035] The first relay receiving coil 251 and the second relay receiving coil 252 are fixed in a state where they are close enough to generate a series parasitic capacitance. In other words, the distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252 is adjusted to a degree that generates a series parasitic capacitance. The parasitic capacitance generated in the first relay receiving coil 251 and the second relay receiving coil 252 includes not only the parasitic capacitance connected in series between the first relay receiving coil 251 and the second relay receiving coil 252, but also, for example, parasitic capacitances connected in parallel between the conductor wiring of each coil. In this embodiment, since the parasitic capacitance configured as series is significantly larger than the parasitic capacitance connected in parallel, it is treated as a case where only a series parasitic capacitance is generated. Hereinafter, the combined capacitance of the series parasitic capacitance generated between the first relay receiving coil 251 and the second relay receiving coil 252 is also referred to as the first parasitic capacitance 257.

[0036] In this embodiment, such as Figure 4 As shown, a dielectric material 256 is disposed between the first relay receiving coil 251 and the second relay receiving coil 252. The dielectric material 256 is a ferroelectric material, such as barium titanate. In addition to ferroelectric materials, the dielectric material 256 can also be a common dielectric such as alumina or magnesium olivine, or any dielectric material with a dielectric constant of 1 or higher.

[0037] The relay receiving coil section 250 has a first self-resonant frequency determined by the first relay receiving coil 251, the second relay receiving coil 252, and the first parasitic capacitance 257. The first self-resonant frequency is set to be the same as the first resonant frequency of the power transmission resonant circuit 110 of the power transmitter 100. The series resonant frequency of the first self-resonant frequency is a frequency smaller than the parallel resonant frequency. The first relay receiving coil 251 and the second relay receiving coil 252 are magnetically coupled to the power transmission coil 112 and receive AC power from the power transmitter 100.

[0038] like Figure 3 As shown, the relay power transmission coil section 260 includes a first relay power transmission coil 261 and a second relay power transmission coil 262. As... Figure 3As shown, the first relay power supply coil 261 is a coil wound to the right from the end 261T1, which is located on the outer periphery of the coil and electrically connected to the first relay power supply coil 261, toward the center of the coil. The second relay power supply coil 262 is a coil wound to the left from the end 262T1, which is located on the outer periphery of the coil and electrically connected to the second relay power receiving coil 252, toward the center of the coil. The second relay power supply coil 262 can also be a coil wound to the right from the end 262T1 toward the center of the coil. The structures of the coils of the first relay power supply coil 261 and the second relay power supply coil 262 can also be reversed. More specifically, the first relay power supply coil 261 is a coil wound to the left from the end 261T1, which is located on the outer periphery of the coil and electrically connected to the first relay power receiving coil 251, toward the center of the coil, and the second relay power supply coil 262 is a coil wound to the right from the end 262T1, which is located on the outer periphery of the coil and electrically connected to the second relay power receiving coil 252, toward the center of the coil. The combination of the coil structure of the relay coil section 260, which consists of the first relay coil 261 and the second relay coil 262, is also referred to as the "fourth combination".

[0039] The first relay power supply coil 261 and the second relay power supply coil 262 are positioned opposite each other with their surfaces parallel and their axes aligned within the vehicle 200. The second relay power supply coil 262 is located closer to the receiver 205 than the first relay power supply coil 261, and its axis is aligned with that of the receiver coil 212. The first and second relay power supply coils 261 and 262 function as resonant coils for magnetic resonance with the receiver coil 212. The axes of the first and second relay power supply coils 261 and 262 may also not be aligned with the axes of the first and second relay receiver coils 251 and 252.

[0040] In the first relay power transmission coil 261, such as Figure 5 As shown, the width W2 in the vertical cross-section of the conductor wiring constituting the coil is greater than the thickness T2. The distance L2 between the conductor wirings of the first relay coil 261 is greater than the distance G2 between the first relay coil 261 and the second relay coil 262. The distance G2 between the first relay coil 261 and the second relay coil 262 refers to the shortest distance between the first relay coil 261 and the second relay coil 262. The second relay coil 262 is also constructed in the same manner as the first relay coil 261. In this embodiment, a dielectric material 256 is disposed between the first relay coil 261 and the second relay coil 262.

[0041] The first relay coil 261 and the second relay coil 262 are fixed in a state where they are close enough to generate a parasitic capacitance connected in series. In other words, the distance G2 between the first relay coil 261 and the second relay coil 262 is adjusted to a degree that generates a parasitic capacitance connected in series. In this embodiment, since the parasitic capacitance configured in series is significantly larger than the parasitic capacitance in parallel, it is treated as a case where only a parasitic capacitance is generated in series. Hereinafter, the combined capacitance of the parasitic capacitance generated in series between the first relay coil 261 and the second relay coil 262 is also referred to as the second parasitic capacitance 267.

[0042] The relay power transmission coil section 260 has a second self-resonant frequency determined by the first relay power transmission coil 261, the second relay power transmission coil 262, and the second parasitic capacitance 267. This second self-resonant frequency is set to be the same as the second resonant frequency of the receiving resonant circuit 210 of the receiver 205. The series resonant frequency of the second self-resonant frequency is a frequency smaller than the parallel resonant frequency. The first relay power transmission coil 261 and the second relay power transmission coil 262 are magnetically coupled to the receiving coil 212 and transmit AC power to the receiver 205.

[0043] As explained above, the contactless power supply system 300 according to this embodiment includes a repeater 270 that transmits AC power received from the power supply coil 112 to the power receiving coil 212. The repeater receiving coil section 250, through the first repeater receiving coil 251 and the second repeater receiving coil 252, determines a first parasitic capacitance 257 for forming a first self-resonant frequency that is the same as the first resonant frequency. The repeater power supply coil section 260, through the first repeater power supply coil 261 and the second repeater power supply coil 262, determines a second parasitic capacitance 267 for forming a second self-resonant frequency that is the same as the second resonant frequency. Therefore, the repeater 270 can receive AC power from the power supply 100 and transmit AC power to the power receiving device 205 without the capacitor. Thus, the repeater 270 can be miniaturized, and the flexibility in its configuration can be increased.

[0044] The contactless power supply system 300 according to this embodiment includes an open-circuit coil, which comprises: a first relay receiving coil 251 and a second relay receiving coil 252 that generate a first parasitic capacitance 257 connected in series; and a first relay transmitting coil 261 and a second relay transmitting coil 262 that generate a second parasitic capacitance 267 connected in series. Since the relay receiving coil 250 and the relay transmitting coil 260 are electrically connected, for example, they can be configured separately from each other, at positions where their axes are not aligned, thereby increasing the flexibility of the repeater 270's configuration. The relay receiving coil 250 and the relay transmitting coil 260 resonate using the series parasitic capacitance, thus simplifying circuit design.

[0045] According to the contactless power supply system 300 of this embodiment, each coil of the relay receiving coil section 250 is composed of a first assembly. More specifically, the first relay receiving coil 251 is a coil wound to the right from one end 251T1 on the outer periphery side of the electrically connected coil, and the second relay receiving coil 252 is a coil wound to the left from one end 252T1 on the outer periphery side of the electrically connected coil. In each coil, the electrically connected end is located on the outer periphery side of the coil, so there is no overlap of the conductor wiring in the axial direction of each coil. Therefore, it is easy to perform the processing of each coil starting from the copper plate.

[0046] According to the contactless power supply system 300 of this embodiment, each coil of the relay power transmission coil section 260 is configured in a fourth combination. More specifically, the first relay power transmission coil 261 is a coil wound to the right from one end 261T1 on the outer periphery side of the electrically connected coil, and the second relay power transmission coil 262 is a coil wound to the left from one end 262T1 on the outer periphery side of the electrically connected coil. In each coil, the electrically connected end is located on the outer periphery side of the coil, so there is no overlap of the conductor wiring in the axial direction of each coil. Therefore, it is easy to perform the processing of each coil starting from the copper plate.

[0047] According to the contactless power supply system 300 of this embodiment, the width W1 of the vertical cross-section of the conductor wiring in the first relay receiving coil 251 is greater than the thickness T1. The conductor wiring of the first relay receiving coil 251 and the second relay receiving coil 252 is configured such that the relative areas of the conductor wiring in each coil are increased, while the relative areas of the conductor wiring in each coil are decreased. The distance L1 between the conductor wiring of the first relay receiving coil 251 is greater than the distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252. The distance between the conductor wiring of the first relay receiving coil 251 and the second relay receiving coil 252 is decreased, while the distance between the conductor wiring in each coil is increased. Therefore, the first parasitic capacitance 257 connected in series can be increased through the first relay receiving coil 251 and the second relay receiving coil 252.

[0048] According to the contactless power supply system 300 of this embodiment, the width W2 of the vertical cross-section of the conductor wiring in the first relay power supply coil 261 is greater than the thickness T2. The conductor wiring in the first relay power supply coil 261 and the second relay power supply coil 262 is configured such that the relative areas of the conductor wiring in each coil are increased, while the relative areas of the conductor wiring in each coil are decreased. The distance L2 between the conductor wiring in the first relay power supply coil 261 is greater than the distance G2 between the first relay power supply coil 261 and the second relay power supply coil 262. The distance between the first relay power supply coil 261 and the second relay power supply coil 262 is decreased, while the distance between the conductor wiring in each coil is increased. Therefore, the second parasitic capacitance 267 connected in series can be increased through the first relay power supply coil 261 and the second relay power supply coil 262.

[0049] According to the contactless power supply system 300 of this embodiment, a dielectric material 256 is disposed between the first relay receiving coil 251 and the second relay receiving coil 252, and between the first relay transmitting coil 261 and the second relay transmitting coil 262. Since the first parasitic capacitance 257 and the second parasitic capacitance 267 can be increased by the dielectric material 256, for example, the number of times each coil of the first relay transmitting coil 261 and the second relay transmitting coil 262 is wound can be reduced.

[0050] B. Second implementation method:

[0051] In the contactless power supply system 300 of the second embodiment, a repeater 270b with a coil having a short-circuit configuration is included. The contactless power supply system 300 of the second embodiment differs from the contactless power supply system 300 of the first embodiment in that it includes a repeater 270b instead of a repeater 270; otherwise, its structure is the same as that of the contactless power supply system 300 of the first embodiment. Figure 6 As shown, the repeater 270b includes a relay receiving coil section 250b and a relay sending coil section 260b.

[0052] The relay receiving coil section 250b includes a third relay receiving coil 253, and the relay transmitting coil section 260b includes a third relay transmitting coil 263. In this embodiment, the third relay receiving coil 253 and the third relay transmitting coil 263 have a generally flat shape and are formed by repeatedly winding copper wires having a generally rectangular cross-sectional shape. The third relay receiving coil 253 and the third relay transmitting coil 263 can be obtained, for example, by cutting a copper plate into a coil shape and filling the conductor wires with dielectric material 256. In the third relay receiving coil 253 and the third relay transmitting coil 263, in addition to flat coils, various coils can be used, such as spring-shaped wound coils (also called spring-type coils) formed by spirally winding conductors with a circular or angular cross-sectional shape, and stacked coils formed by stacking multiple flat coils. The dielectric material 256 is disposed at positions corresponding to each type of conductor wire of the coil.

[0053] The third relay receiving coil 253 is disposed at the lower part of the vehicle 200. The third relay sending coil 263 is located further away from the receiver 205 than the third relay sending coil 263, and is configured such that their axes coincide with those of the receiving coil 212. The axis of the third relay receiving coil 253 may also not coincide with the axis of the third relay sending coil 263.

[0054] like Figure 6 As shown, one end 253T1 of the third relay receiving coil 253 is electrically connected to one end 263T1 of the third relay transmitting coil 263 via wiring C31. The third relay receiving coil 253 is a coil wound to the right from the end 253T1, which is located on the outer periphery of the coil and electrically connected to the third relay transmitting coil 263. The other end 253T2 of the third relay receiving coil 253 is electrically connected to the other end 263T2 of the third relay transmitting coil 263 via wiring C32. The third relay transmitting coil 263 is a coil wound to the right from the end 263T1, which is located on the outer periphery of the coil and electrically connected to the third relay receiving coil 253.

[0055] like Figure 7 As shown, the distance L3 between the conductor wires of the third relay receiving coil 253 is adjusted to a degree that reduces the amount of parasitic capacitance that would result in parallel connection. In this embodiment, dielectric material 256 is disposed between the conductor wires of the third relay receiving coil 253. Thus, in this embodiment, the parasitic capacitance that is configured to be connected in parallel between the conductor wires of the third relay receiving coil 253 is increased. Furthermore, the structure of the third relay transmitting coil 263 is the same as that of the third relay receiving coil 253, therefore, its description is omitted.

[0056] The combined capacitance of the parasitic capacitances generated in parallel in the third relay receiving coil 253 is also referred to as the first parasitic capacitance 257b, and the combined capacitance of the parasitic capacitances generated in parallel in the third relay transmitting coil 263 is also referred to as the second parasitic capacitance 267b. Repeater 270b can be... Figure 8 The circuit shown is a circuit representation.

[0057] The relay receiving coil section 250b has a first self-resonant frequency determined by the third relay receiving coil 253 and the first parasitic capacitance 257b. The first self-resonant frequency is set to be the same as the first resonant frequency of the power transmission resonant circuit 110 of the power transmitter 100. The third relay receiving coil 253 functions as a resonant coil for magnetic resonance with the power transmission coil 112, and receives AC power from the power transmitter 100 through magnetic coupling with the power transmission coil 112.

[0058] The relay transmission coil section 260b has a second self-resonant frequency determined by the third relay transmission coil 263 and the second parasitic capacitance 267b. The second self-resonant frequency is set to be the same as the second resonant frequency of the receiving resonant circuit 210 of the receiver 205. The third relay transmission coil 263 functions as a resonant coil for magnetic resonance with the receiving coil 212, and transmits AC power to the receiver 205 through magnetic coupling with the receiving coil 212.

[0059] As explained above, the contactless power supply system 300 according to this embodiment includes a coil in a short-circuit manner. This coil includes a third relay receiving coil 253 that generates a first parasitic capacitance 257b connected in parallel, and a third relay transmitting coil 263 that generates a second parasitic capacitance 267b connected in parallel. Therefore, the repeater 270b can receive AC power from the transmitter 100 and transmit AC power to the receiver 205 without the capacitor being present. Since the relay receiving coil 250b and the relay transmitting coil 260b are electrically connected, they can be configured separately from each other, or at positions where their axes are not aligned, thereby increasing the flexibility in configuring the repeater 270b.

[0060] According to the contactless power supply system 300 of this embodiment, a dielectric material 256 is disposed between the conductor wiring of the third relay receiving coil 253 and between the conductor wiring of the third relay transmitting coil 263. The dielectric material 256 can increase the first parasitic capacitance 257b and the second parasitic capacitance 267b connected in parallel, and, for example, can reduce the number of times each coil of the third relay receiving coil 253 and the third relay transmitting coil 263 is wound.

[0061] C. Other implementation methods:

[0062] (C1) such as Figure 9 As shown, in the relay receiving coil section 250 of the first embodiment described above, a first conductive plate 259 may be included at the center of the first relay receiving coil 251, and a second conductive plate 258 opposite to the first conductive plate 259 may be included at the center of the second relay receiving coil 252. According to this contactless power supply system 300, the relative area between the conductor wiring of the first relay receiving coil 251 and the second relay receiving coil 252 can be increased, and the first parasitic capacitance 257 connected in series can be increased. Each conductive plate 258, 259 can be integrally formed with the coil during the coil forming process, or a flat conductive plate separate from the coil can be installed at the center of the coil. Figure 9 As shown, the first conductive plate 259 has an opening 259c at the axis of the first relay receiving coil 251 for the magnetic flux of the first relay receiving coil 251 to pass through, and the second conductive plate 258 has an opening 258c at the axis of the second relay receiving coil 252 for the magnetic flux of the second relay receiving coil 252 to pass through. Besides providing openings 258c and 259c, each conductive plate 258 and 259 can also be positioned so as not to obstruct the formation of magnetic flux in each coil.

[0063] (C2) In the relay power supply coil section 260 of the first embodiment described above, a third conductive plate may be included at the center of the first relay power supply coil 261, and a fourth conductive plate opposite to the third conductive plate may be included at the center of the second relay power supply coil 262. The structures of the third and fourth conductive plates may also be the same as those of the first conductive plate 259 and the second conductive plate 258. According to this non-contact power supply system 300, the relative area between the conductor wiring of the first relay power supply coil 261 and the second relay power supply coil 262 can be increased, and the second parasitic capacitance 267 can be increased. Each conductive plate may be integrally formed with the coil during the processing of forming the coil, or a flat conductive plate separate from the coil may be installed at the center of the coil. In addition to providing an opening, the third and fourth conductive plates may also be positioned in a position that does not obstruct the formation of magnetic flux in each coil.

[0064] (C3) In the first embodiment described above, the first relay receiving coil 251 and the second relay receiving coil 252 of the relay receiving coil section 250 are configured by a first combination. In contrast, as... Figure 10 As shown, the first relay receiving coil 251 and the second relay receiving coil 252 can also be configured by the following second combination. More specifically, as... Figure 10As shown, the second relay receiving coil 252 is a coil wound to the right from the center of the coil, starting from one end 252T1, which is located on the outer periphery of the coil and electrically connected to the second relay sending coil 262. The first relay receiving coil 251 is a coil wound to the right from the center of the coil, starting from the other end 251T2, which is located on the outer periphery of the coil and is open. Figure 10 As shown, one end 251T1 of the first relay receiving coil 251 extends from the center of the coil to the outer periphery. The first relay receiving coil 251 can also be a coil wound to the left from the other end 251T2 toward the center of the coil. The structures of the coils of the first relay receiving coil 251 and the second relay receiving coil 252 can also be opposite. More specifically, the first relay receiving coil 251 is a coil wound to the right from the center of the coil from the end 251T1, which is located on the outer periphery of the coil and is electrically connected to the first relay sending coil 261, and the second relay receiving coil 252 is a coil wound to the right from the center of the coil from the other end 252T2, which is located on the outer periphery of the coil and is open.

[0065] (C4) In the first embodiment described above, the first relay receiving coil 251 and the second relay receiving coil 252 of the relay receiving coil section 250 are constituted by a first combination. In contrast, as... Figure 11 As shown, the first relay receiving coil 251 and the second relay receiving coil 252 can also be configured by the following third combination. More specifically, as... Figure 11 As shown, the second relay receiving coil 252 is a coil wound to the left from the other end 252T2, which is located on the outer periphery of the coil and is open, toward the center of the coil. Figure 11 As shown, one end 252T1 of the second relay receiving coil 252 extends from the center of the coil to the outer periphery. The first relay receiving coil 251 is a coil wound to the right from the center of the coil, with the other end 251T2, which is located on the outer periphery and is open. Figure 11 As shown, one end 251T1 of the first relay receiving coil 251 extends from the center of the coil to the outer periphery. The first relay receiving coil 251 can also be a coil wound to the left from the other end 251T2 toward the center of the coil. The structures of the coils of the first relay receiving coil 251 and the second relay receiving coil 252 can also be opposite. More specifically, the first relay receiving coil 251 is a coil wound to the left from the other end 251T2, which is located on the outer periphery of the coil and is open, toward the center of the coil, and the second relay receiving coil 252 is a coil wound to the right from the other end 252T2, which is located on the outer periphery of the coil and is open, toward the center of the coil.

[0066] (C5) In the first embodiment described above, the first relay power transmission coil 261 and the second relay power transmission coil 262 of the relay power transmission coil section 260 are configured by a fourth combination. In contrast, the first relay power transmission coil 261 and the second relay power transmission coil 262 may also be configured by a fifth combination. More specifically, the second relay power transmission coil 262 is a coil wound to the right from one end 262T1, which is disposed on the outer periphery of the coil and electrically connected to it, toward the center of the coil. The first relay power transmission coil 261 is a coil wound to the right from the other end 261T2, which is disposed on the outer periphery of the coil and is open, toward the center of the coil. One end 261T1 of the first relay power transmission coil 261 extends from the center of the coil to the outer periphery. The first relay power transmission coil 261 may also be a coil wound to the left from the other end 261T2 toward the center of the coil. The structures of the coils of the first relay power supply coil 261 and the second relay power supply coil 262 can also be opposite. More specifically, the first relay power supply coil 261 is a coil wound to the right from the center of the coil from one end 261T1, which is located on the outer periphery of the coil and is electrically connected to the first relay power receiving coil 251. The second relay power supply coil 262 is a coil wound to the right from the center of the coil from the other end 262T2, which is located on the outer periphery of the coil and is open.

[0067] (C6) In the first embodiment described above, the first relay power transmission coil 261 and the second relay power transmission coil 262 of the relay power transmission coil section 260 are configured by a fourth combination. In contrast, the first relay power transmission coil 261 and the second relay power transmission coil 262 may also be configured by the following sixth combination. More specifically, the second relay power transmission coil 262 is a coil wound to the left from the other end 262T2, which is located on the outer periphery of the coil and is open, toward the center of the coil. One end 262T1 of the second relay power transmission coil 262 extends from the center of the coil to the outer periphery. The first relay power transmission coil 261 is a coil wound to the right from the other end 261T2, which is located on the outer periphery of the coil and is open, toward the center of the coil. One end 261T1 of the first relay power transmission coil 261 extends from the center of the coil to the outer periphery. The first relay power transmission coil 261 may also be a coil wound to the left from the other end 261T2 toward the center of the coil. The structures of the coils of the first relay power transmission coil 261 and the second relay power transmission coil 262 can also be opposite. More specifically, the first relay power transmission coil 261 is a coil wound to the left from the other end 261T2, which is located on the outer periphery of the coil and is open, toward the center of the coil, and the second relay power transmission coil 262 is a coil wound to the right from the other end 262T2, which is located on the outer periphery of the coil and is open, toward the center of the coil.

[0068] (C7) In the above embodiments, the relay receiving coils 250 and 250b are disposed at the lower part of the vehicle 200. However, the relay receiving coils 250 and 250b can also be disposed at any position in the vehicle 200, such as the tires or rims, where they can be magnetically coupled to the power transmission resonant circuit 110. The relay sending coils 260 and 260b can also be disposed at any position in the vehicle 200 where they can be magnetically coupled to the power receiving resonant circuit 210. Both the relay receiving coils and the relay sending coils can also be disposed on the road RS.

[0069] (C8) In the first embodiment described above, examples of the width W1 in the vertical cross-section of the conductor wiring constituting the coil are shown in the first relay receiving coil 251 and the second relay receiving coil 252, and examples of the width W2 of the conductor wiring are shown in the first relay transmitting coil 261 and the second relay transmitting coil 262. In contrast, in at least one of the conductor wirings of the first relay receiving coil 251, the second relay receiving coil 252, the first relay transmitting coil 261, and the second relay transmitting coil 262, the width of the outer periphery of the coil and the width of the center side of the coil are set to be different, for example, the width at the center side of the coil is larger than the width at the outer periphery of the coil, so as to increase the series parasitic capacitance. According to this method, the contactless power supply system 300 can increase the series parasitic capacitance without changing the external area of ​​the coil.

[0070] (C9) In the first embodiment described above, an example is shown in which, in the first relay receiving coil 251, the width W1 in the vertical cross-section of the conductor wiring is greater than the thickness T1, and the distance L1 between the conductor wirings is greater than the distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252. Conversely, in the first relay receiving coil 251, the width W1 in the vertical cross-section of the conductor wiring may also be less than the thickness T1, and the distance L1 between the conductor wirings may be less than the distance G1 between the first relay receiving coil 251 and the second relay receiving coil 252.

[0071] (C10) In the first embodiment described above, an example is shown in which, in the first relay power transmission coil 261, the width W2 of the conductor wiring is greater than the thickness T2, and the distance L2 between the conductor wirings is greater than the distance G2 between the first relay power transmission coil 261 and the second relay power transmission coil 262. Conversely, in the first relay power transmission coil 261, it is also possible that the width W2 of the conductor wiring is less than the thickness T2, and the distance L2 between the conductor wirings is less than the distance G2 between the first relay power transmission coil 261 and the second relay power transmission coil 262.

[0072] (C11) In the first embodiment described above, a dielectric material 256 is disposed between the first relay receiving coil 251 and the second relay receiving coil 252 and between the first relay transmitting coil 261 and the second relay transmitting coil 262, but the dielectric material 256 may not be disposed.

[0073] (C12) In the second embodiment described above, the dielectric material 256 is disposed between the conductor wiring of the third relay receiving coil 253, but the dielectric material 256 may not be disposed.

[0074] (C13) In the first embodiment described above, an example is shown where a dielectric material 256 is disposed between the first relay receiving coil 251 and the second relay receiving coil 252, and between the first relay transmitting coil 261 and the second relay transmitting coil 262. In contrast, it is also possible to dispose of multiple dielectric materials with different dielectric constants between at least one of the first relay receiving coil 251 and the second relay receiving coil 252, and between the first relay transmitting coil 261 and the second relay transmitting coil 262. For example, a dielectric material with a higher dielectric constant could be disposed on the center side of the coil, and a dielectric material with a lower dielectric constant compared to the center side could be disposed on the outer periphery side of the coil, thereby increasing the series parasitic capacitance. According to this method, the contactless power supply system 300 can achieve a larger series parasitic capacitance.

[0075] (C14) In the first to sixth combinations mentioned above, one end 251T1 of the first relay receiving coil 251 is electrically connected to one end 262T1 of the second relay sending coil 262, and one end 252T1 of the second relay receiving coil 252 is electrically connected to one end 261T1 of the first relay sending coil 261.

[0076] This disclosure is not limited to the embodiments described above, and can be implemented through various structures without departing from the above-described spirit. For example, the technical features in the embodiments corresponding to the technical features described in the summary section can be appropriately replaced or combined to solve part or all of the above-described technical problems, or to achieve part or all of the above-described effects. Furthermore, the above-described technical features can be appropriately deleted unless they are described as essential structures in this specification.

Claims

1. A contactless power supply system, wherein the contactless power supply system is a contactless power supply system for vehicles, comprising: A power transmitter having a first capacitor and a power transmission coil for transmitting alternating current, and having a first resonant frequency determined by the power transmission coil and the first capacitor; A power receiver having a second capacitor and a receiving coil for receiving alternating current, and having a second resonant frequency determined by the receiving coil and the second capacitor; as well as A repeater that transmits AC power received from the transmitting coil to the receiving coil. The repeater includes: A relay receiving coil section, the relay receiving coil section being used to receive AC power supplied from the transmitting coil, and including at least one coil for determining a first parasitic capacitance for forming a frequency identical to the first resonant frequency, i.e., a first self-resonant frequency; and The relay transmission coil section is used to transmit AC power to the receiving device, and includes at least one coil for determining a second parasitic capacitance that forms a second self-resonant frequency, which is the same frequency as the second resonant frequency. The at least one coil of the relay receiving coil section is directly electrically connected to the at least one coil of the relay transmitting coil section.

2. The contactless power supply system as described in claim 1, characterized in that, The relay receiving coil section includes two coils: a first relay receiving coil and a second relay receiving coil. The second relay receiving coil is close to and opposite the first relay receiving coil on the receiver side, and is used to generate the first parasitic capacitance connected in series. The relay power transmission coil section includes two coils: a first relay power transmission coil and a second relay power transmission coil. The second relay power transmission coil is close to and opposite the first relay power transmission coil on the power transmitter side, and is used to generate the second parasitic capacitance connected in series. One end of the first relay receiving coil is electrically connected to one end of the first relay transmitting coil, while the other ends of the first relay receiving coil and the first relay transmitting coil are open. One end of the second relay receiving coil is electrically connected to one end of the second relay transmitting coil, while the other ends of the second relay receiving coil and the second relay transmitting coil are open. The series resonant frequency of the first self-resonant frequency is set to be consistent with the frequency of the alternating current supplied from the power transmission coil, and is a frequency smaller than the parallel resonant frequency of the first self-resonant frequency. The series resonant frequency of the second self-resonant frequency is set to be consistent with the frequency of the AC power received by the energized coil, and is a frequency smaller than the parallel resonant frequency of the second self-resonant frequency.

3. The contactless power supply system as described in claim 2, characterized in that, The first relay receiving coil and the second relay receiving coil of the relay receiving coil section constitute at least one of the first combination, the second combination, and the third combination. In the first combination, one coil is a planar coil wound to the right from the end disposed on the outer periphery of the coil and electrically connected, while the other coil is a planar coil with the end to be electrically connected disposed on the outer periphery of the coil. In the second combination, one coil is a planar coil wound to the right from one end located on the outer periphery of the coil and electrically connected, while the other coil is a planar coil with its other end open and located on the outer periphery of the coil. In the third combination, one coil is a planar coil wound to the left from the other end, which is located on the outer periphery of the coil and is open, and the other coil is a planar coil with the other end, which is open, located on the outer periphery of the coil.

4. The contactless power supply system as described in claim 2 or 3, characterized in that, The first relay power transmission coil and the second relay power transmission coil of the relay power transmission coil section constitute at least one of the fourth combination, the fifth combination, and the sixth combination. In the fourth combination, one coil is a planar coil wound to the right from the end located on the outer periphery of the coil and electrically connected, while the other coil is a planar coil with the end to be electrically connected located on the outer periphery of the coil. In the fifth combination, one coil is a planar coil wound to the right from one end located on the outer periphery of the coil and electrically connected, while the other coil is a planar coil with its other end, which is open, located on the outer periphery of the coil. In the sixth combination, one coil is a planar coil wound to the left from the other end, which is located on the outer periphery of the coil and is open, and the other coil is a planar coil with the other end, which is open, located on the outer periphery of the coil.

5. The contactless power supply system as described in claim 2, characterized in that, The relay receiving coil section includes a first conductive plate at the center of the first relay receiving coil and a second conductive plate opposite to the first conductive plate at the center of the second relay receiving coil.

6. The contactless power supply system as described in claim 2, characterized in that, The relay power transmission coil section includes a third conductive plate at the center of the first relay power transmission coil and a fourth conductive plate opposite to the third conductive plate at the center of the second relay power transmission coil.

7. The contactless power supply system as described in claim 2, characterized in that, In at least one of the relay receiving coil section and the relay transmitting coil section, the line width on the outer periphery of the coil is different from the line width on the center side of the coil.

8. The contactless power supply system as described in claim 2, characterized in that, In the first and second relay coils of the relay receiving coil section, The distance L1 between the conductors constituting the coil is greater than the shortest distance G1 between the first relay receiving coil and the second relay receiving coil. The width W1 in the cross-section of the conductor is greater than the thickness T1 in the cross-section of the conductor.

9. The contactless power supply system as described in claim 2, characterized in that, In the first relay power transmission coil and the second relay power transmission coil of the relay power transmission coil section, The distance L2 between the conductors constituting the coil is greater than the shortest distance G2 between the first relay coil and the second relay coil. The width W2 in the cross-section of the conductor is greater than the thickness T2 in the cross-section of the conductor.

10. The contactless power supply system as described in claim 2, characterized in that, A dielectric material is disposed between the first relay receiving coil and the second relay receiving coil in the relay receiving coil section, or between the first relay transmitting coil and the second relay transmitting coil in the relay transmitting coil section.

11. The contactless power supply system as described in claim 10, characterized in that, The dielectric material includes multiple dielectric materials with different dielectric constants.

12. The contactless power supply system as described in claim 1, characterized in that, The relay receiving coil section includes a third relay receiving coil that generates the first parasitic capacitance connected in parallel. The relay transmission coil section includes a third relay transmission coil that generates the second parasitic capacitance connected in parallel. One end of the third relay receiving coil is electrically connected to one end of the third relay transmitting coil, and the other end of the third relay receiving coil is electrically connected to the other end of the third relay transmitting coil. The parallel resonant frequency of the first self-resonant frequency is set to be consistent with the frequency of the AC power supplied from the power transmission coil. The parallel resonant frequency of the second self-resonant frequency is set to be consistent with the frequency of the AC power received by the receiving coil.

13. The contactless power supply system as described in claim 12, characterized in that, In at least one of the third relay receiving coil of the relay receiving coil section or the third relay transmitting coil of the relay transmitting coil section, a dielectric material is disposed between the wires of the coil.

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