Electric field resonance type wireless power transmission device and electric field resonance type wireless power transmission system

Abstract

To provide a field resonant wireless power transmission device and a field resonant wireless power transmission system having a coupler unit of small size and lightweight.SOLUTION: The device comprises a power transmission side electrode unit 301A including a pair of power transmission side electrodes 10, a power transmission side coil L1 disposed at a distance from the power transmission side electrode unit 301A, and a power supply housing 4 for housing a power supply body 41. The power transmission side coil L1 is disposed inside the power supply housing 4, or the power transmission side coil L1 is disposed between the power transmission side electrode unit 301A and the power supply housing 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electric field resonance type wireless power transmission device and an electric field resonance type wireless power transmission system. [Background technology]

[0002] In recent years, with the spread of mobile phones and electric vehicles, there has been active development of electric field resonance type wireless power transmission systems that supply power wirelessly. A technology has been proposed that transmits power wirelessly by creating electric field resonance in a coupler consisting of an electrode on the power transmitting side and an electrode on the power receiving side (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6200446 Summary of the Invention [Problem to be solved by the invention]

[0004] When the resonant coil is integrated with the power transmitting electrode or the power receiving electrode, the coupler including the resonant coil becomes large. If the transmission power is large, the heat generated by the coil increases, and a heat dissipation mechanism is required in the coupler, which causes a problem of the coupler becoming larger. [Means for solving the problem]

[0005] An electric field resonance type wireless power transmitting device and an electric field resonance type wireless power transmission system according to the present invention include an electrode unit including a pair of power transmitting electrodes, and a power transmitting coil arranged spaced apart from the electrode unit. Effect of the Invention

[0006] According to the present invention, the size and weight of the coupler portion can be reduced. [Brief description of the drawings]

[0007] [Figure 1] 1 is a block diagram of an electric field resonance type wireless power transmission system according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a circuit configuration of an electric field resonance type wireless power transmission system according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a cross-sectional view of a coupler body according to one embodiment of the present invention. [Figure 4] FIG. 2 is a perspective view showing a power source, a power transmitting side electrode unit, and a power receiving side electrode unit according to an embodiment of the present invention. [Diagram 5] FIG. 2 illustrates efficiency, reflection, and loss in one embodiment of the present invention. [Figure 6] 13A and 13B are diagrams showing modified examples of the coupler body according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an electric field resonance type wireless power transmitting device and an electric field resonance type wireless power transmission system according to an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same components are given the same reference numerals. In the orthogonal coordinate system XYZ shown in the drawing, the direction parallel to the electrode plane is the X-axis direction, the direction in the plane perpendicular to the X-axis direction is the Y-axis direction, and the direction perpendicular to the electrode plane is the Z-axis direction. Below, the description will be made using this coordinate system as appropriate.

[0009] (Embodiment 1) Hereinafter, an electric field resonance type wireless power transmitting device and an electric field resonance type wireless power transmission system S according to the first embodiment will be described with reference to FIGS.

[0010] 1 shows a block diagram of an electric field resonance type wireless power transmission system S according to one embodiment of the present invention. The electric field resonance type wireless power transmission system S includes an electric field resonance type wireless power transmitting device 1 and an electric field resonance type wireless power receiving device 2.

[0011] First, the configuration of the electric field resonance type wireless power transmitter 1 will be described. The electric field resonance type wireless power transmitter 1 includes a power supply housing 4 and a power transmission side electrode unit 301A. The power supply housing 4 includes a power supply main body 41, a booster 6, a power transmission side coil L1, and a cooling device 42. The power sent from the power supply main body 41 is boosted by the booster 6. The booster 6 boosts the voltage output from the power supply main body 41 and converts it into a voltage suitable for power transmission. The boosted power is transmitted to the power transmission side electrode unit 301A via the power transmission side coil L1. The power transmission side electrode unit 301A includes a power transmission side capacitor C12 and a power transmission side coupler main body 301. The transmitted power is transmitted from the power transmission side coupler main body 301 to the electric field resonance type wireless power receiver 2. The cooling device 42 cools each device provided in the power supply housing 4.

[0012] The configuration of the electric field resonance type wireless power receiving device 2 will be described. The electric field resonance type wireless power receiving device 2 includes a power receiving side coupler body 302, a power receiving side reactance adjustment circuit 32, a step-down unit 8, and a rectifier circuit 9, and is connected to a load 5. The power receiving side coupler body 302 receives power from the power transmitting side coupler body 301 by wireless transmission. The power receiving side coupler body 302 and the power receiving side reactance adjustment circuit 32 constitute a power receiving side electrode unit 302A. The power received by the power receiving side coupler body 302 is transmitted to the load 5 via the power receiving side reactance adjustment circuit 32, the step-down unit 8, and the rectifier circuit 9. The step-down unit 8 converts the transmitted voltage into a voltage suitable for the circuit. The rectifier circuit 9 converts the power transmitted as AC to DC. The load 5 is, for example, a storage battery, which is used in industrial equipment, portable electronic devices, and the like. Examples of industrial equipment include electric vehicles, and examples of portable electronic devices include laptop computers, smartphones, and portable music players.

[0013] The power transmitting side reactance adjustment circuit 31, the power transmitting side coupler body 301, the power receiving side coupler body 302, and the power receiving side reactance adjustment circuit 32 constitute a coupling unit 3, which provides electric field resonance wireless transmission.

[0014] Fig. 2 is a schematic diagram of a circuit configuration of an electric field resonance type wireless power transmission system S according to one embodiment of the present invention. The first power transmitting side plate electrode 11 and the second power transmitting side plate electrode 12 shown in Fig. 2 are held by a power transmitting side coupler main body 301, and the first power receiving side plate electrode 21 and the second power receiving side plate electrode 22 are held by a power receiving side coupler main body 302.

[0015] A first capacitance Cm1 is formed between the first power transmitting side flat plate electrode 11 and the first power receiving side flat plate electrode 21, and a second capacitance Cm2 is formed between the second power transmitting side flat plate electrode 12 and the second power receiving side flat plate electrode 22. A first stray capacitance C11 due to the formation of an electric field is formed between the first power transmitting side flat plate electrode 11 and the second power receiving side flat plate electrode 12, and a second stray capacitance C21 due to the formation of an electric field is formed between the first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22.

[0016] The first power transmitting side flat plate electrode 11 and the second power transmitting side flat plate electrode 12 are collectively referred to as a pair of power transmitting side flat plate electrodes 10. The first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22 are collectively referred to as a pair of power receiving side flat plate electrodes 20. The capacitance formed by the pair of power transmitting side flat plate electrodes 10 and the pair of power receiving side flat plate electrodes 20 is collectively referred to as Cm.

[0017] The first power transmitting side plate electrode 11 is connected to one terminal 401 on the power transmitting side of the power supply main body 41 via the first power transmitting side transmission line 101 and the first power transmitting side coil L11 in this order. The second power transmitting side plate electrode 12 is connected to the other terminal 402 on the power transmitting side of the power supply main body 41 via the second power transmitting side transmission line 102 and the second power transmitting side coil L12 on the power transmitting side in this order. The first power transmitting side transmission line 101 and the second power transmitting side transmission line 102 are connected to each other via a power transmitting side capacitor C12. The first power transmitting side coil L11, the second power transmitting side coil L12 on the power transmitting side, and the power transmitting side capacitor C12 form a power transmitting side reactance adjustment circuit 31.

[0018] The first power transmitting side coil L11 and the second power transmitting side coil L12 are collectively referred to as a power transmitting side coil L1. The first power transmitting side transmission line 101 and the second power transmitting side transmission line 102 are collectively referred to as a pair of power transmitting side transmission lines 100.

[0019] The first power receiving side plate electrode 21 is connected to one terminal 501 on the power receiving side of the load 5 via a first power receiving side transmission line 201 and a first power receiving side coil L21 in this order. The second power receiving side plate electrode 22 is connected to the other terminal 502 on the power receiving side of the load via a second power receiving side transmission line 202 and a second power receiving side coil L22 in this order. The first power receiving side transmission line 201 and the second power receiving side transmission line 202 are connected via a power receiving side capacitor C22. The first power receiving side coil L21, the second power receiving side coil L22, and the power receiving side capacitor C22 form a power receiving side reactance adjustment circuit 32.

[0020] The first power receiving side coil L21 and the second power receiving side coil L22 are collectively referred to as the power receiving side coil L2. The first power receiving side transmission line 201 and the second power receiving side transmission line 202 are collectively referred to as a pair of power receiving side transmission lines 200.

[0021] As described above, the capacitive coupling type wireless power transmission method in which a coil and a capacitor are provided for a coupler is called an electric field resonance method.

[0022] Alternating current is transmitted from the power supply main body 41 shown in Fig. 2. Electric charge is stored in or discharged from the first capacitance Cm1 and the second capacitance Cm2, thereby transmitting power. Power is transmitted to the electric field resonance type wireless power receiving device 2 via the first capacitance Cm1 and the second capacitance Cm2, and power is supplied to the load 5.

[0023] The first power transmitting side transmission line 101 according to the present embodiment has a long distance between the first power transmitting side coil L11 and the power transmitting side capacitor C12 that constitute the reactance adjustment circuit, and the second power transmitting side transmission line 102 according to the present embodiment has a long distance between the second power transmitting side coil L12 and the power transmitting side capacitor C12 that constitute the reactance adjustment circuit. The first power transmitting side coil L11 and the second power transmitting side coil L12 are arranged away from the power transmitting side electrode unit 301A. The first power transmitting side transmission line 101 and the second power transmitting side transmission line 102 are drawn out from a housing having the power transmitting side coupler main body 301.

[0024] The power transmitting side capacitor C12, the first power transmitting side plate electrode 11, the second power transmitting side plate electrode 12, the power transmitting side housing 13 and the handle 17 shown in Fig. 3 and Fig. 4, etc. configure the power transmitting side electrode unit 301A. The first power receiving side coil L21, the second power receiving side coil L22, the power receiving side capacitor C22, the first power receiving side plate electrode 21, the second power receiving side plate electrode 22, etc. configure the power receiving side electrode unit 302A.

[0025] The coupling unit 3 according to this embodiment is of a slot-in type, in which electrodes on the power receiving side face each other with a gap between them and an electrode on the power transmitting side is inserted into the gap. The configuration and operation of this slot-in type will be described below with reference to Fig. 3. In Fig. 3, the X-axis and Y-axis are taken in directions parallel to the electrode plane, and the direction in which the power transmitting side flat electrode is inserted is the X-axis direction. The direction perpendicular to the electrode plane is the Z-axis direction. The Z-axis direction is referred to as the upward direction.

[0026] The electric field resonance type wireless power receiving device 2 has a plate-shaped first power receiving side housing 23 and a second power receiving side housing 24 facing each other. The first power receiving side housing 23 and the second power receiving side housing 24 have a first power receiving side flat plate electrode 21 and a second power receiving side flat plate electrode 22 on the opposing surfaces, respectively. The surfaces of the first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22 are covered with a third high dielectric constant resin 25 and a fourth high dielectric constant resin 26, respectively.

[0027] The electric field resonance type wireless power transmitter 1 has a plate-shaped or box-shaped power transmitter housing 13. The power transmitter housing 13 has a first power transmitter flat plate electrode 11 and a second power transmitter flat plate electrode 12 on its upper and lower surfaces, respectively. The surfaces of the first power transmitter flat plate electrode 11 and the second power transmitter flat plate electrode 12 are covered with a first high dielectric constant resin 15 and a second high dielectric constant resin 16, respectively. Covering the electrodes with these high dielectric constant resins prevents electrical short circuits.

[0028] During power supply, the power transmitting side housing 13 and the first and second power transmitting side plate electrodes 11 and 12 of the electric field resonance type wireless power transmitting device 1 are inserted into the gap 27 between the first power receiving side housing 23 and the second power receiving side housing 24. The first power receiving side plate electrode 21 and the first power transmitting side plate electrode 11 face each other to form the first capacitance Cm1 in Fig. 2, and the second power receiving side plate electrode 22 and the second power transmitting side plate electrode 12 face each other to form the second capacitance Cm2 in Fig. 2.

[0029] The first power transmission side plate electrode 11 and the second power transmission side plate electrode 12 of the electric field resonance type wireless power transmitting device 1 face each other with the power transmission side housing 13 in between, forming a first stray capacitance C11 shown in Fig. 2. Furthermore, a power transmission side capacitor C12 is provided connecting between the first power transmission side transmission line 101 and the second power transmission side transmission line 102. The power transmission side capacitor C12 is smaller than the first power transmission side coil L11, and is therefore provided inside the power transmission side housing 13.

[0030] An AC power is transmitted from the power source on the power transmission side. When a positive voltage is transmitted and a positive charge is accumulated from the power source in the first power transmission side flat plate electrode 11, a negative charge is induced in the first power reception side flat plate electrode 21 through the first capacitance Cm1. Then, the negative voltage is transmitted to the power receiving side. When a negative voltage is transmitted and a negative charge is accumulated from the power source in the first power transmission side flat plate electrode 11, a positive charge is induced in the first power reception side flat plate electrode 21 through the first capacitance Cm1. Then, the positive voltage is transmitted to the power receiving side. Then, AC power is transmitted to the power receiving side. AC power is also transmitted between the second power transmission side flat plate electrode 12 and the second power receiving side flat plate electrode 22 in the same manner. As described above, the power from the power transmission side is transmitted to the power receiving side device through the first capacitance Cm1 and the second capacitance Cm2.

[0031] As shown in Fig. 1, the power transmitting side coil L1, which is a combination of the first power transmitting side coil L11 and the second power transmitting side coil L12, is housed in a power supply housing 4. The power transmitting side electrode unit 301A does not have the power transmitting side coil L1. The power transmitting side coupler main body 301 consists only of the first power transmitting side flat plate electrode 11, the second power transmitting side flat plate electrode 12, and a plate-shaped or box-shaped power transmitting side housing 13. The power transmitting side electrode unit 301A has the power transmitting side coupler main body 301 and a power transmitting side capacitor C12.

[0032] The coupler may be held in the hand for use. FIG. 4 shows a perspective view of an embodiment. For example, a coupler of an electric field resonance type wireless power transmitting device is loaded into a charging coupler of an automobile at a power receiving station. A pair of power transmitting side transmission lines 100 extend from a power source housing 4 to a power transmitting side electrode unit 301A. The pair of power transmitting side transmission lines 100 are connected to a first power transmitting side flat plate electrode 11 and a second power transmitting side flat plate electrode 12 (not shown) via a power transmitting side housing 13. The power transmitting side electrode unit 301A is provided with a handle 17 since it is operated by hand. The power transmitting side electrode unit 301A is inserted into a power receiving side electrode unit 302A.

[0033] The power transmission coil L1 (not shown) is housed in the power supply housing 4.

[0034] According to this embodiment, the handle 17 is simply rod-shaped and does not include a heavy object such as a coil, thereby realizing an electric field resonance type wireless power transmitting device with excellent operability.

[0035] As the power increases, the heat generated by the coil cannot be ignored. In a configuration in which the power transmission coil L1 is provided adjacent to the power transmission coupler body 301, it becomes necessary to provide a cooling structure and a heat dissipation structure in the coupler, which may lead to an increase in size. Furthermore, when the power is high, heat dissipation becomes an issue. For example, if a mechanism is used to dissipate heat in the handle, there is a concern that the handle will become too hot to hold.

[0036] In the electric field resonance type wireless power transmitting device according to the present embodiment, the power transmitting coil L1 is placed inside the power supply housing 4, thereby making it possible to utilize the cooling function of the cooling device 42 provided in the power supply housing 4. This prevents the handle of the power transmitting electrode unit 301A from becoming hot and from becoming large in size.

[0037] If coaxial cables are used for the pair of transmission lines 100 on the power transmission side, the above-mentioned limit distance is shortened. For this reason, it is preferable to use balanced cables as the transmission lines. This makes it possible to suppress the decrease in transmission rate. It is preferable to use cross-linked polyethylene insulated vinyl sheath cables (CV cables) as the balanced cables. These can also be made cheaper than coaxial cables.

[0038] The transmittance, reflectance, and loss conditions of the transmission in this embodiment are shown in Fig. 5. The results of a comparative example in which the first power transmitting side coil L11 and the second power transmitting side coil L12 on the power transmitting side are provided adjacent to the power transmitting side coupler body 301 are shown in Figs. 5A, 5B, and 5C. The conditions according to this embodiment are shown in Figs. 5D, 5E, and 5F. Figs. 5A and 5D show the efficiency. Figs. 5B and 5E show the reflectance. Figs. 5C and 5F show the loss.

[0039] 5A and 5D, in the electric field resonance type wireless power transmitting device according to this embodiment, the efficiency decrease is suppressed to 5%, and the loss increase is suppressed to 3%. Although the efficiency decreases due to the parasitic resistance of the extension, considering the above-mentioned advantages of size, weight, temperature, etc., this decrease in efficiency is negligible.

[0040] It is effective to adopt the electric field resonance type wireless power transmission system according to the present embodiment as a power supply system for an automobile. At a charging station, a driver operates a power transmission coupler and inserts it into a power receiving coupler provided in the automobile. The power transmission coupler is lightweight and can be easily operated by the driver.

[0041] (Variation 1) It is preferable to provide the power transmitting side coil L1 independently rather than providing the power transmitting side coil L1 inside the power supply housing 4. In other words, it is preferable to place the power transmitting side coil L1 between the power transmitting side electrode unit 301A and the power supply housing 4. If the heat generated by the power transmitting side coil L1 is at a level that does not require a cooling device and the weight is not a problem, the entire system can be constructed by regarding the power transmitting side coil L1 as part of the cable.

[0042] (Variation 2) It is also preferable to provide the power transmitting capacitor C12 in the power source housing 4, rather than in the power transmitting electrode unit 301A. This allows the size and weight of the power transmitting electrode unit 301A to be further reduced. (Variation 3) A configuration without the power transmitting side capacitor C12 may also be adopted. In general, in order to achieve resonance, it is necessary to optimize the product of the capacitor capacity and the coil inductance, and a smaller capacitor capacity requires a larger inductance, which results in a larger coil. In this embodiment, the power transmitting side coil L1 is provided inside the power supply housing 4 and does not affect the size and weight of the coupler section, so an increase in the size of the power transmitting side coil L1 is not a problem. The absence of the power transmitting side capacitor C12 makes the power transmitting side electrode unit 301A smaller and lighter.

[0043] (Variation 4) In the first embodiment, only the power transmitting side coil L1 has been described. It is effective to separate the power receiving side coil L2 from the power receiving side electrode unit 302A, and furthermore, to store it inside the housing of the load 5. In many cases, a cooling device is also provided inside the housing of the load 5. In this case, the power receiving side coil L2 can be cooled at the same time. Like the power transmitting side electrode unit 301A, the power receiving side electrode unit 302A can also be made thin and lightweight. Like the third modification, a configuration without the power receiving side capacitor C22 is also preferable.

[0044] (Variation 5) As described above, the first embodiment and the first to fifth modifications have been described, but it is preferable to combine these appropriately. This makes it possible to reduce the size and weight of the power transmitter side electrode unit 301A and the power receiver side electrode unit 302A.

[0045] (Embodiment 2) In the first embodiment, the power transmitting side electrode and the power receiving side electrode are arranged on planes parallel to each other. In the second embodiment, as shown in Fig. 6, the first power transmitting side flat plate electrode 11 and the second power transmitting side flat plate electrode 12 are arranged side by side on the same plane. Similarly, the first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22 are arranged side by side on the same plane.

[0046] An electric field is formed between the first power transmitting side flat plate electrodes 11 and 12, and a first stray capacitance C11 is formed as shown in Fig. 2. An electric field is formed between the first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22, and a second stray capacitance C21 is formed.

[0047] During power supply, it is preferable that the first power transmitting side plate electrode 11 of the electric field resonance type wireless power transmitting device 1 faces the first power receiving side plate electrode 21 of the electric field resonance type wireless power receiving device 2, and the second power transmitting side plate electrode 12 of the electric field resonance type wireless power transmitting device 1 faces the second power receiving side plate electrode 22 of the electric field resonance type wireless power receiving device 2.

[0048] The pair of power transmitting side flat electrodes 10 are connected to a power source body 41 via a first power transmitting side coil L11 or a second power transmitting side coil L12, and the pair of power receiving side flat electrodes 20 are connected to a load 5 via a first power receiving side coil L21 or a second power receiving side coil L22.

[0049] The first power transmitting side flat plate electrode 11 and the second power transmitting side flat plate electrode 12 constitute a power transmitting side coupler main body 301, and the first power receiving side flat plate electrode 21 and the second power receiving side flat plate electrode 22 constitute a power receiving side coupler main body 302.

[0050] In the above-mentioned first and second embodiments, a power transmitting side flat plate electrode and a power receiving side flat plate electrode are used as the power transmitting side and power receiving side electrodes. Here, if the power transmitting side electrode and the power receiving side electrode form a capacitance, the shape of the electrodes is not limited to a flat plate. For example, curved or spherical electrodes can be used.

[0051] The electric field resonance type wireless power transmitting device according to the embodiment described above provides the following advantages.

[0052] The electric field resonance type wireless power transmitter 1 includes a power transmitter electrode unit 301A including a pair of power transmitter electrodes 10, and a power transmitter coil L1 disposed apart from the power transmitter electrode unit 301A.

[0053] By separating the heavy-weight power transmitter coil L1 from the power transmitter electrode unit 301A, the power transmitter electrode unit 301A is made smaller and lighter. In addition, the power transmitter electrode unit 301A does not heat up due to the power transmitter coil L1, which is a heat source. Alternatively, there is no need to provide a cooling device for cooling the power transmitter coil L1, which is a heat source, in the power transmitter electrode unit 301A, and for this reason, the power transmitter electrode unit 301A is made smaller and lighter.

[0054] The electric field resonance type wireless power transmitting device 1 further includes a power supply housing 4 that houses a power supply main body 41, and the power transmitting coil L1 is disposed inside the power supply housing 4.

[0055] The power transmission coil L1, which is a heat generating body, can be cooled by a cooling device 42 provided in the power supply case 4.

[0056] The electric field resonance type wireless power transmitting device 1 further includes a power supply housing 4 that houses a power supply main body 41, and the power transmitting coil L1 is disposed away from the power supply housing 4.

[0057] An increase in the mass and weight of the power supply case 4 can be prevented.

[0058] In the electric field resonance type wireless power transmitting device 1, a pair of power transmitting side transmission lines 100 connecting a pair of power transmitting side plate electrodes 10 and a power transmitting side coil L1 are made of balanced lines.

[0059] The decrease in transmission efficiency is suppressed.

[0060] The electric field resonance type wireless power transmission system S includes the above-mentioned electric field resonance type wireless power transmitting device 1 and an electric field resonance type wireless power receiving device 2 to which power is transmitted from the electric field resonance type wireless power transmitting device 1.

[0061] The power transmitting electrode unit 301A is small and lightweight, the power transmitting coil L1 is cooled by a cooling device 42 provided in the power supply housing 4, and an electric field resonance type wireless power transmission system with high transmission efficiency is obtained.

[0062] The electric field resonance type wireless power transmission system includes an electric field resonance type wireless power receiving device having an electrode unit including a pair of power receiving side flat plate electrodes corresponding to a pair of power transmitting side flat plate electrodes, and a power receiving side coil disposed at a distance from the electrode unit.

[0063] The power-receiving side electrode unit 302A is reduced in size and weight.

[0064] Various embodiments and modifications of the present disclosure are possible without departing from the broad spirit and scope of the present invention. The above-described embodiments are for the purpose of explaining the present invention and do not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims, not the embodiments. Various modifications made within the scope of the claims and the scope of the disclosure equivalent thereto are considered to be within the scope of the present invention. [Explanation of symbols]

[0065] REFERENCE SIGNS LIST 1 electric field resonance type wireless power transmitting device, 2 electric field resonance type wireless power receiving device, 3 coupling section, 4 power supply housing, 5 load, 10 pair of power transmitting side flat plate electrodes, 11 first power transmitting side flat plate electrode, 12 second power transmitting side flat plate electrode, 20 pair of power receiving side flat plate electrodes, 21 first power receiving side flat plate electrode, 22 second power receiving side flat plate electrode, 41 power supply body, 301 power transmitting side coupler body section, 301A power transmitting side electrode unit, 302 power receiving side coupler body section, 302A power receiving side electrode unit, L1 power transmitting side coil, L11 first power transmitting side coil, L12 second power transmitting side coil, L2 receiving side coil, L21 first power receiving side coil, L22 second power receiving side coil, S electric field resonance type wireless power transmission system

Claims

1. a power transmitter electrode unit including a pair of power transmitter electrodes, that is, a first power transmitter electrode and a second power transmitter electrode; a power transmitter coil disposed at a distance from the power transmitter electrode unit, a power transmitting side transmission line connecting the power transmitting side electrode and the power transmitting side coil is made of a balanced line, the power transmitting side transmission line includes a first power transmitting side transmission line connected to the first power transmitting side electrode and a second power transmitting side transmission line connected to the second power transmitting side electrode, the power transmitting side coil includes a first power transmitting side coil connected to the first power transmitting side transmission line and a second power transmitting side coil connected to the second power transmitting side transmission line; the first power transmitting side electrode is connected to one terminal of a power transmitting side of a power supply body that supplies AC current via the first power transmitting side transmission line and the first power transmitting side coil, in that order; and the second power transmitting side electrode is connected to the other terminal of the power transmitting side of the power supply body via the second power transmitting side transmission line and the second power transmitting side coil, in that order. An electric field resonance type wireless power transmission device.

2. The pair of power transmitting electrodes is a pair of flat plate electrodes. The electric field resonance type wireless power transmitting device according to claim 1 .

3. Further comprising a power supply housing that houses the power supply body, The power transmission coil is disposed inside the power supply housing. The electric field resonance type wireless power transmitting device according to claim 1 or 2.

4. Further comprising a power supply housing that houses the power supply body, The power transmitting coil is disposed between the power transmitting electrode unit and the power supply housing. The electric field resonance type wireless power transmitting device according to claim 1 or 2.

5. An electric field resonance type wireless power transmitting device according to any one of claims 1 to 4, an electric field resonance type wireless power receiving device to which power is transmitted from the electric field resonance type wireless power transmitting device; Equipped Electric field resonance type wireless power transmission system.

6. The electric field resonance type wireless power receiving device is a power receiving side electrode unit including a pair of power receiving side electrodes corresponding to the pair of power transmitting side electrodes; a power receiving side coil disposed at a distance from the power receiving side electrode unit; The electric field resonance type wireless power transmission system according to claim 5 .

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