Wireless power transmission system

Abstract

To provide a wireless power transmission system capable of improving transmission efficiency when transmitting power from a power transmission unit to a power reception unit.SOLUTION: A wireless power transmission device 10 transmits AC power from a power transmission unit 20 to a power reception unit 30 in a non-contact manner. The power transmission unit 20 includes: first main electrode units 26A and 28A disposed on a power reception unit 30 side; first back-surface side auxiliary electrode units 26B and 28B disposed so as to face the first main electrode units 26A and 28A on a side opposite to the power reception unit 30 side; and first end portion side auxiliary electrode units 26C and 28C disposed at an outer end portion of the first main electrode units 26A and 28A.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wireless power transmission system that transmits AC power in a contactless manner. [Background technology]

[0002] In recent years, wireless power transfer systems that transmit AC power from a power transmitting side to a power receiving side in a contactless manner have been developed. Such wireless power transfer systems are configured to transmit power in a contactless manner by resonating a power transmitting-side resonant circuit and a power receiving-side resonant circuit.

[0003] For example, Patent Document 1 discloses a wireless power transmission device that transmits power contactlessly from a power transmitting side electrical circuit that has a data receiving coil 4 in addition to a power transmitting coil 3 to a power receiving coil 8 in a power receiving side electrical circuit that has a data transmitting coil 9 in addition to a power receiving coil 8 by using magnetic field coupling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-340285 Summary of the Invention [Problem to be solved by the invention]

[0005] The wireless power transmission device described in Patent Document 1 has a problem in that the power transmission efficiency is low when transmitting power from the power transmitting unit to the power receiving unit due to large power loss in the coil that serves to transmit power.

[0006] An object of the present invention is to provide a wireless power transmission system that can improve the transmission efficiency when transmitting power from a power transmitting unit to a power receiving unit. [Means for solving the problem]

[0007] A wireless power transmission system according to a first aspect of the present invention is a wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a contactless manner, and the power transmitting unit includes a first main electrode unit arranged on the power receiving unit side, a first back-side auxiliary electrode unit arranged to face the surface of the first main electrode unit opposite to the power receiving unit side, and a first end-side auxiliary electrode unit arranged on one end side of the first main electrode unit.

[0008] A wireless power transmission system according to a second aspect of the present invention is a wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a contactless manner, and the power receiving unit includes a second main electrode unit arranged on the power transmitting unit side, a second back-side auxiliary electrode unit arranged to face the surface of the second main electrode unit opposite to the power receiving unit side, and a second end-side auxiliary electrode unit arranged on one end side of the second main electrode unit.

[0009] A wireless power transmission system according to a third aspect of the present invention is a wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a contactless manner, in which the power transmitting unit includes a first main electrode unit arranged on the power receiving unit side, a first back-side auxiliary electrode unit arranged to face the power receiving unit across the first main electrode unit, and a first end-side auxiliary electrode unit arranged on one end side of the first main electrode unit, and the power receiving unit includes a second main electrode unit arranged on the power transmitting unit side, a second back-side auxiliary electrode unit arranged to face the power transmitting unit across the second main electrode unit, and a second end-side auxiliary electrode unit arranged on one end side of the second main electrode unit.

[0010] In the wireless power transmission system according to the first or third aspect of the present invention, the first main electrode portion, the first back-side auxiliary electrode portion, and the first end-side auxiliary electrode portion may be integrally formed of a conductive member, and an end portion of the first back-side auxiliary electrode portion opposite the first end-side auxiliary electrode portion may be supported by the first main electrode portion via a support.

[0011] In the wireless power transmission system according to the second or third aspect of the present invention, the second main electrode portion, the second back-side auxiliary electrode portion, and the second end-side auxiliary electrode portion may be integrally formed of a conductive member, and an end portion of the second back-side auxiliary electrode portion opposite the second end-side auxiliary electrode portion may be supported by the second main electrode portion via a support. [Effects of the Invention]

[0012] According to the wireless power transmission system of the first aspect of the present invention, the capacitance between the electrodes in the power transmitting unit can be increased by providing the first back-side auxiliary electrode and the first end-side auxiliary electrode in addition to the first main electrode. Here, when the resonant frequency between the power transmitting unit and the power receiving unit is the same, the transmission loss between the power transmitting unit and the power receiving unit is smaller when the capacitance between the electrodes included in the power transmitting unit is larger than when the capacitance between the electrodes included in the power transmitting unit is smaller. Therefore, the increase in the capacitance between the electrodes in the power transmitting unit makes it possible to improve the transmission efficiency when transmitting AC power from the power transmitting unit to the power receiving unit.

[0013] According to the wireless power transmission system of the second aspect of the present invention, the capacitance between the electrodes in the power receiving unit can be increased by providing the second back-side auxiliary electrode and the second end-side auxiliary electrode in addition to the second main electrode. Here, when the resonant frequency between the power transmitting unit and the power receiving unit is the same, the transmission loss between the power transmitting unit and the power receiving unit is smaller when the capacitance between the electrodes included in the power receiving unit is larger than when the capacitance between the electrodes included in the power receiving unit is smaller. Therefore, the increase in the capacitance between the electrodes in the power receiving unit makes it possible to improve the transmission efficiency when transmitting AC power from the power transmitting unit to the power receiving unit.

[0014] According to a wireless power transmission system according to a third aspect of the present invention, the capacitance between the electrodes in the power transmitting unit and the capacitance between the electrodes in the power receiving unit can be increased by providing first and second rear-side auxiliary electrodes and first and second end-side auxiliary electrodes in addition to the first and second main electrodes. Here, when the resonant frequency between the power transmitting unit and the power receiving unit is constant, the transmission loss between the power transmitting unit and the power receiving unit is smaller when the capacitance between the electrodes included in the power transmitting unit and the capacitance between the electrodes included in the power receiving unit are larger than when the capacitance between the electrodes included in the power receiving unit is smaller. Therefore, by increasing the capacitance between the electrodes included in the power transmitting unit and the capacitance between the electrodes included in the power receiving unit, it is possible to improve the transmission efficiency when transmitting AC power from the power transmitting unit to the power receiving unit. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing an equivalent circuit of the entire wireless power transmission system according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of the power receiving unit and the power transmitting unit. [Figure 3] FIG. 3 is a diagram showing the configuration of the power receiving unit and the power transmitting unit when viewed from the direction A shown in FIG. [Figure 4] FIG. 4 is a semi-logarithmic graph showing the relationship between the transmission efficiency and the index function. [Figure 5] FIG. 5(a) is a diagram showing the configuration of a power transmission coupler according to a first modified example, similar to FIG. 3, and FIG. 5(b) is a diagram showing the configuration of a power transmission coupler according to a second modified example, similar to FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0016] A wireless power transmission system 10 according to one embodiment of the present invention will now be described with reference to the drawings. Fig. 1 is a diagram showing an equivalent circuit of the entire wireless power transmission system 10 according to this embodiment. As shown in Fig. 1, the wireless power transmission system 10 is a power supply system, for example, of an electric field coupling type, that transmits AC power contactlessly by utilizing series resonance, and includes an AC power generation unit 11, a power transmission unit 20, a power receiving unit 30, and a load 17, and has a function of supplying power output from the AC power generation unit 11 to the load 17 via the power transmission unit 20 and the power receiving unit 30.

[0017] As shown in FIG. 1, power supply load 12 has a value Z0 equal to the characteristic impedance of connecting lines 12A and 12B (see FIG. 2) and connecting lines 12C and 12D (see FIG. 2). Inductor 13L corresponds to inductors 13A and 13B (see FIG. 2) and has an element value (inductance) of L1. Resistor 13R represents a resistance associated with the power transmission circuit, primarily inductors 13A and 13B (see FIG. 2), and has an element value of R1. Capacitor 14 is a capacitor with an element value (capacitance) C1 (which can also be expressed as inter-electrode self-capacitance) generated between right electrode 26 (see FIG. 2) and left electrode 28 (see FIG. 2) in power transmission unit 20.

[0018] Capacitor 15 is a capacitor with an element value (capacitance) C2 that occurs between right electrode 36 (see FIG. 2) and left electrode 38 (see FIG. 2) of power receiving unit 30 (this can also be expressed as inter-electrode self-capacitance). Inductor 16L corresponds to inductors 13C and 13D and has an element value L2. Resistor 16R represents a resistance associated with the power receiving circuit, mainly inductors 13C and 13D, and has an element value R2. Load 17 is formed, for example, by a rectifier, a secondary battery, etc. Power transmitting / receiving capacitor 18 is a capacitor formed between left and right electrodes 26 and 28 (see FIG. 2) of power transmitting unit 20 and left and right electrodes 36 and 38 (see FIG. 2) of power receiving unit 30 and has an element value Cm1.

[0019] Fig. 2 is a perspective view showing the configuration of the power transmitting unit 20 and the power receiving unit 30 in this embodiment. Fig. 3 is a diagram showing the configuration of the power transmitting unit 20 and the power receiving unit 30 when viewed from direction A shown in Fig. 2. In Figs. 2 and 3, "X" indicates the horizontal direction parallel to the short side direction of a first main electrode unit 28A (described later), "Y" indicates the horizontal direction parallel to the longitudinal direction of the first main electrode unit 28A, and "Z" indicates the vertical direction. In Fig. 2, the housings 24 and 34 are shown by dashed lines to avoid cumbersome illustration.

[0020] 2 and 3, the wireless power transmission system 10 includes a power transmitting unit 20 and a power receiving unit 30 that are arranged to face each other. Since the power transmitting unit 20 and the power receiving unit 30 have almost the same configuration, the following description will mainly focus on the power transmitting unit 20, and the description of the power receiving unit 30 will be omitted where appropriate.

[0021] The power transmitting unit 20 includes a power transmitting coupler 22 and a housing 24 that houses the power transmitting coupler 22, and is disposed directly below the power receiving unit 30. The power transmitting coupler 22 is composed of a right electrode unit 26 and a left electrode unit 28. The right electrode unit 26 and the left electrode unit 28 are formed symmetrically and have substantially the same configuration. For this reason, the following description will mainly focus on the configuration of the left electrode unit 28, and will omit a description of the right electrode unit 26 as appropriate.

[0022] The left-side electrode portion 28 is made of a conductive member having electrical conductivity, such as aluminum, and is configured by bending a substantially rectangular flat plate into a substantially U-shape, and is configured from: a first main electrode portion 28A located on the power receiving portion 30 side; a first back-side auxiliary electrode portion 28B located on the back side of the first main electrode portion 28A, i.e., directly above the power receiving portion 30, and disposed substantially parallel to the first main electrode portion 28A; and a first end-side auxiliary electrode portion 28C formed between the outer ends of the first main electrode portion 28A and the first back-side auxiliary electrode portion 28B. In the present embodiment, the first main electrode portion 28A, the first back-side auxiliary electrode portion 28B, and the first end-side auxiliary electrode portion 28C are formed in a substantially rectangular shape in a plan view.

[0023] The inner ends of the first main electrode portion 28A of the left electrode portion 28 and the first main electrode portion 26A of the right electrode portion 26 are arranged parallel to each other at a predetermined distance α, thereby forming the above-mentioned capacitor 14 (see Figure 1).

[0024] In addition, the distance β between the outer ends of the first main electrode portions 26A, 28A in both electrode portions 26, 28 is set to be narrower than the near field expressed by λ / (2×π), where λ is the wavelength of the electric field radiated from both electrode portions 26, 28.

[0025] 1, pillars P1 (see FIG. 2) and P2 (see FIG. 3) are attached between both ends in the width direction (i.e., the Y direction) of the first rear-side auxiliary electrode portion 28B near the open end (in other words, the inner end) and the first main electrode portion 26A. These pillars P1 and P2 (hereinafter, referred to as "pillars P" as appropriate unless there is a need to particularly distinguish them) are connected and fixed to the first main electrode portion 28A and the first rear-side auxiliary electrode portion 28B, respectively, using, for example, fixing members such as rivets or a fixing method such as press fitting.

[0026] This keeps the distance between the first rear-side auxiliary electrode portion 28B and the first main electrode portion 28A constant, and allows the opening end side portion of the first rear-side auxiliary electrode portion 28B to be supported by the first main electrode portion 28A.

[0027] An inductor 13B is connected to the inner end of the first main electrode portion 28A via a connection wire 12B. The support pillar P may be made of a conductive member provided so as to be electrically connected to both the first main electrode portion 26A and the first rear-side auxiliary electrode portion 28B, or may be made of an insulating member.

[0028] The housing 24 is formed in a generally box-like shape from a conductive material such as aluminum, and the power transmitting coupler 22 is fixed to the housing 24 via a plurality of insulating resin spacers (not shown), thereby holding and fixing the power transmitting coupler 22 in an insulated state.

[0029] The power receiving unit 30 includes a power receiving coupler 32 and a housing 34 that houses the power receiving coupler 32. The power receiving coupler 32 has substantially the same configuration as the power transmitting coupler 22 described above and is arranged so as to be substantially symmetrical in the up-down direction to the power transmitting coupler 22. The power receiving coupler 32 is also composed of a right electrode unit 36 ​​and a left electrode unit 38 that are arranged so as to be symmetrical in the left-right direction and have substantially the same configuration. In the following explanation, the configuration of the left electrode unit 38 will be mainly described, and an explanation of the right electrode unit 36 ​​will be omitted as appropriate.

[0030] The left-side electrode portion 38 is composed of a second main electrode portion 38A located on the power transmission unit 20 side, a second back-side auxiliary electrode portion 38B located on the back side of the second main electrode portion 38A, i.e., on the opposite side from the power transmission unit 20, and arranged approximately parallel to the second main electrode portion 38A, and a second end-side auxiliary electrode portion 38C formed between the outer end sides of the second main electrode portion 38A and the second back-side auxiliary electrode portion 38B.

[0031] Here, the relationship between capacitor 14 of power transmitting unit 20 and capacitor 15 of power receiving unit 30 and the transmission efficiency ηmax between power transmitting unit 20 and power receiving unit 30 will be described.

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[0032] In the present embodiment, when the element values ​​L1 and L2 are equal and the element values ​​R1 and R2 of the resistors 13R and 16R are equal, the relationship Q=Q1=Q2 is established from the above equations (2) and (3). In this case, a correlation is established between the transmission efficiency ηmax and the product kQ of the coupling coefficient k and the above Q, as shown in Fig. 4. In the following description, the product kQ will be referred to as an index function kQ where appropriate.

[0033] Figure 4 is a semi-logarithmic graph showing the transmission efficiency ηmax on the vertical axis and the index function kQ on the horizontal axis in logarithmic scale. As shown in Figure 4, as the index function kQ increases, the transmission efficiency ηmax also increases. Furthermore, assuming that the coupling coefficient k is constant, increasing the value of Q improves the transmission efficiency ηmax.

[0034] Therefore, it seems possible to improve the transmission efficiency ηmax by increasing the element values ​​L1 and L2 included in the numerators of the above equations (2) and (3). However, increasing the element values ​​L1 and L2 requires dense winding of the coil. Increasing the element values ​​L1 and L2 by densely winding the coil also increases the element values ​​R1 and R2 included in the denominators of the above equations (2) and (3). The effect of increasing the element values ​​R1 and R2 is thus greater than the effect of increasing the element values ​​L1 and L2, resulting in increased transmission loss. Therefore, transmission loss is greater when the element values ​​L1 and L2 are large compared to when they are small, and therefore the transmission efficiency ηmax is lower when the element values ​​L1 and L2 are large than when they are small.

[0035] Therefore, when the resonant frequency in the power transmitting unit 20 and the power receiving unit 30 is constant, if the element value C1 (capacitance) of the capacitor 14 included in the power transmitting unit 20 or the element value C2 (capacitance) of the capacitor 15 included in the power receiving unit 30 is small, the element values ​​L1 and L2 in the inductors 13L and 18L become large, resulting in large transmission losses.

[0036] On the other hand, if the element value C1 of capacitor 14 included in power transmitting unit 20 and the element value C2 of capacitor 15 included in power receiving unit 30 are large, the element values ​​L1 and L2 of inductor 13L and inductor 18L will be small, and the transmission loss between power transmitting unit 20 and power receiving unit 30 will be small.

[0037] Therefore, when the resonant frequencies of the power transmitting unit 20 and the power receiving unit 30 are the same, the transmission loss can be reduced by increasing the element value C1 and the element value C2.

[0038] Incidentally, although the capacitance of capacitor 14 and capacitor 15 can be increased by increasing the area of ​​each electrode unit 26, 28, 36, and 38 (see FIG. 2 ) in power transmitting unit 20 and power receiving unit 30, increasing the area of ​​the electrodes in a plan view increases the installation space for the electrodes, which can cause problems such as making it difficult to secure the installation space. For example, even if it is assumed that part of wireless power transmission system 10, for example, power receiving unit 30 or load 17, is mounted on a moving object such as an electric vehicle, it is difficult to secure a large installation space due to the limited space inside the electric vehicle.

[0039] In this embodiment, by providing each rear-side auxiliary electrode portion 28B, 38B and each end-side auxiliary electrode portion 28C, 38C, the element values ​​C1, C2 of the capacitors 14 and 15 are increased while suppressing an increase in the installation space for the electrodes in a planar view.

[0040] Furthermore, when the power receiving unit 30 of the wireless power transmission system 10 is mounted on a mobile object such as an electric vehicle, it is necessary to hold the electrodes so that they do not deform due to vibrations that occur when the mobile object is running.

[0041] Therefore, in this embodiment, the open end side of first rear-side auxiliary electrode portion 28B is fixedly connected to first main electrode portion 28A via supports P1 and P2, thereby suppressing vibration of left-side electrode portion 28 due to excitation forces generated while the mobile object is traveling, etc. This makes it possible to suppress deformation of first main electrode portion 28A and first rear-side auxiliary electrode portion 28B.

[0042] Furthermore, according to the wireless power transmission system 10, by providing the first back-side auxiliary electrode portion 28B and the first end-side auxiliary electrode portion 28C in addition to the first main electrode portion 28A of the power transmitting unit 20, it is possible to increase the element value (capacitance) C1 of the capacitor 14 in the power transmitting unit 20. Therefore, the increase in the capacitance of the capacitor 14 in the power transmitting unit 20 makes it possible to improve the transmission efficiency when transmitting AC power from the power transmitting unit 20 to the power receiving unit 30.

[0043] Furthermore, according to the wireless power transmission system 10, by providing the second back-side auxiliary electrode portion 38B and the second end-side auxiliary electrode portion 38C in addition to the second main electrode portion 38A of the power receiving unit 30, it is possible to increase the element value (capacitance) C2 of the capacitor 15 in the power receiving unit 30. Therefore, the increase in the capacitance of the capacitor 15 in the power receiving unit 30 makes it possible to improve the transmission efficiency when transmitting AC power from the power transmitting unit 20 to the power receiving unit 30.

[0044] In the above embodiment, an example is described in which, in addition to the main electrodes 28A, 38A, the back-side auxiliary electrodes 28B, 38B and the end-side auxiliary electrodes 28C, 38C are provided in both the power transmitting unit 20 and the power receiving unit 30, but the present invention is not limited to this. For example, only one of the power transmitting unit 20 and the power receiving unit 30 may be provided with back-side auxiliary electrodes and end-side auxiliary electrodes.

[0045] 5(a) and 5(b), a first and second modified examples of the power transmission coupler 22 will be described. In the following description, the same components as those of the power transmission coupler 22 in the above embodiment will be denoted by the same reference numerals as appropriate, and a description thereof will be omitted, with only the different components being described.

[0046] 5(a) is a diagram showing the configuration of a power transmission coupler 42 according to a first modified example of the power transmission coupler 22, as viewed from direction A, similar to FIG. 3. As shown in FIG. 5(a), the power transmission coupler 42 includes a right-side electrode portion 46 and a left-side electrode portion 48. The two electrode portions 46, 48 have the same configuration except for being symmetrical. Therefore, the following description will mainly focus on the left-side electrode portion 48, and will omit a description of the right-side electrode portion 46 as appropriate. The left-side electrode portion 48 includes a first main electrode portion 48A, a first rear-side auxiliary electrode portion 48B, and a first end-side auxiliary electrode portion 48C.

[0047] The first main electrode portion 48A and the first rear-side auxiliary electrode portion 48B have the same configuration as the first main electrode portion 28A and the first rear-side auxiliary electrode portion 28B of the above embodiment. The first end-side auxiliary electrode portion 48C has the same configuration as the first end-side auxiliary electrode portion 28C, except that it is formed so as to be bent inward in a substantially V-shape. When using the power transmitting coupler 42 according to this first modification, a power receiving coupler that is arranged vertically symmetrically with the power transmitting coupler 42 and has the same configuration as the power receiving coupler 42 may be used instead of the power receiving coupler 32 of the above embodiment. In these cases, the same effects as those of the wireless power transmission system 10 according to the above embodiment can be obtained.

[0048] 5(b) is a diagram showing the configuration of a power transmission coupler 52 according to a second modified example of the power transmission coupler 22, as viewed from direction A, similar to FIG. 3. As shown in FIG. 5(b), the power transmission coupler 52 includes a right-side electrode portion 56 and a left-side electrode portion 58. The two electrode portions 56, 58 have the same configuration except for being symmetrical. Therefore, the following description will mainly focus on the left-side electrode portion 58, and the description of the right-side electrode portion 56 will be omitted where appropriate. The left-side electrode portion 58 includes a first main electrode portion 58A, a first rear-side auxiliary electrode portion 58B, and a first end-side auxiliary electrode portion 58C.

[0049] The first main electrode portion 58A and the first rear-side auxiliary electrode portion 58B have the same configuration as the first main electrode portion 28A and the first rear-side auxiliary electrode portion 28B of the above embodiment. The first end-side auxiliary electrode portion 58C has the same configuration as the first end-side auxiliary electrode portion 28C, except that it is formed to be curved outward in a semicircular arc shape.

[0050] When using the power transmitting coupler 52 according to the second modification, the power receiving coupler 32 in the above embodiment may be replaced with a power receiving coupler that is arranged vertically symmetrically with the power transmitting coupler 52 and has the same configuration as the power transmitting coupler 52. In these cases, the same effects as those of the wireless power transmission system 10 according to the above embodiment can be obtained.

[0051] The present invention can be implemented in various forms, including improvements, modifications, and variations based on the knowledge of those skilled in the art, without departing from the spirit of the invention. Furthermore, the invention can be implemented in a form in which any of the features of the invention are replaced with other technology, as long as the same action or effect is achieved. [Explanation of symbols]

[0052] 10 Wireless power transmission system 20 Power Transmission Section 22, 42, 52 Power transmission coupler 24 cabinets 26 Right side electrode section 28 Left side electrode section 28A 1st main electrode section 28B 1st back side auxiliary electrode part 28C First end side auxiliary electrode part 30 Power receiving unit 32 Receiving coupler 34 Case 36 Right side electrode section 38 Left side electrode section 38A 2nd main electrode section 38B 2nd back side auxiliary electrode part 38C Second end side auxiliary electrode part P1,P2,P pillar

Claims

1. A wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a non-contact manner, the power transmitting unit includes a first main electrode unit disposed on the power receiving unit side, a first back-side auxiliary electrode unit disposed to face a surface of the first main electrode unit opposite to the power receiving unit side, and a first end-side auxiliary electrode unit disposed on one end side of the first main electrode unit. Wireless power transmission system.

2. A wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a non-contact manner, the power receiving unit includes a second main electrode unit disposed on the power transmitting unit side, a second back-side auxiliary electrode unit disposed to face a surface of the second main electrode unit opposite to the power receiving unit side, and a second end-side auxiliary electrode unit disposed on one end side of the second main electrode unit. Wireless power transmission system.

3. A wireless power transmission system that transmits AC power from a power transmitting unit to a power receiving unit in a non-contact manner, the power transmitting unit includes a first main electrode unit disposed on the power receiving unit side, a first rear-side auxiliary electrode unit disposed to face the power receiving unit with the main electrode unit therebetween, and a first end-side auxiliary electrode unit disposed on one end side of the first main electrode unit, the power receiving unit includes a second main electrode unit disposed on the power transmitting unit side, a second back-side auxiliary electrode unit disposed to face the power transmitting unit with the second main electrode unit therebetween, and a second end-side auxiliary electrode unit disposed on one end side of the second main electrode unit. Wireless power transmission system.

4. the first main electrode portion, the first rear-side auxiliary electrode portion, and the first end-side auxiliary electrode portion are integrally formed of a conductive member, and an end of the first rear-side auxiliary electrode portion opposite to the first end-side auxiliary electrode portion is supported by the first main electrode portion via a support pillar. The wireless power transmission system according to claim 1 or 3.

5. the second main electrode portion, the second rear-side auxiliary electrode portion, and the second end-side auxiliary electrode portion are integrally formed of a conductive member, and an end of the second rear-side auxiliary electrode portion opposite to the second end-side auxiliary electrode portion is supported by the second main electrode portion via a support pillar. The wireless power transmission system according to claim 2 or 3.

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