JP2022138850A - Field resonant wireless power transmission device and field resonant wireless power transmission system - Google Patents

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

The present invention relates to an electric field resonance type wireless power transmission device and an electric field resonance type wireless power transmission system.

2. Description of the Related Art In recent years, with the spread of mobile phones, electric vehicles, and the like, development of electric field resonance type wireless power transmission systems that supply power wirelessly has been actively pursued. A technology has been proposed in which electric field resonance is caused by a coupler composed of an electrode on the power transmission side and an electrode on the power reception side, and power is transmitted wirelessly. (Patent Document 1).

Japanese Patent No. 6200446

When the resonance coil is arranged integrally with the power transmission side electrode or the power reception side electrode, the coupler including the resonance coil becomes large. When the transmission power is large, the heat generation of the coil becomes large, and a heat dissipation mechanism is required in the coupler section, which causes a problem that the size of the coupler becomes larger.

An electric field resonance type wireless power transmission 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 transmission side electrodes, and a power transmission side coil spaced apart from the electrode unit.

According to the present invention, the size and weight of the coupler portion can be reduced.

1 is a block diagram of an electric field resonance type wireless power transmission system according to an embodiment of the present invention; FIG. 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; FIG. FIG. 2 is a cross-sectional configuration diagram of a coupler main body according to one embodiment of the present invention; 1 is a perspective view showing a power supply, a power transmission side electrode unit, and a power reception side electrode unit according to an embodiment of the present invention; FIG. FIG. 4 is a diagram showing efficiency, reflection and loss in one embodiment of the invention; It is a figure which shows the modification of the coupler main-body part concerning one Embodiment of this invention.

An electric field resonance type wireless power transmission device and an electric field resonance type wireless power transmission system according to embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same component. In the orthogonal coordinate system XYZ shown in the figure, one direction parallel to the electrode plane is the X-axis direction, the direction in the plane orthogonal to the X direction is the Y-axis direction, and the direction orthogonal to the electrode plane is the Z-axis direction. Hereinafter, description will be made using this coordinate system as appropriate.

(Embodiment 1)
An electric field resonance type wireless power transmission device and an electric field resonance type wireless power transmission system S according to Embodiment 1 will be described below with reference to FIGS. 1 to 5. FIG.

FIG. 1 shows a block diagram of an electric field resonance type wireless power transmission system S according to one embodiment of the present invention. An 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 .

First, the configuration of the electric field resonance type wireless power transmission device 1 will be described. The electric field resonance type wireless power transmission device 1 includes a power supply housing 4 and a power transmission side electrode unit 301A. The power supply housing 4 has a power supply main body 41 , a booster section 6 , a power transmission side coil L<b>1 , and a cooling device 42 . Electric power sent from the power source body 41 is boosted by the booster 6 . The booster 6 boosts the voltage output from the power supply body 41 and converts it into a voltage suitable for power transmission. The boosted electric 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 has a power transmission side capacitor C12 and a power transmission side coupler body portion 301 . The transmitted power is transmitted from the power transmission side coupler main body 301 to the electric field resonance type wireless power receiving device 2 . The cooling device 42 cools each device provided in the power supply housing 4 .

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 portion 302 , a power receiving side reactance adjustment circuit 32 , a step-down portion 8 and a rectifying circuit 9 , and is connected to the load 5 . The power receiving side coupler body section 302 receives power from the power transmission side coupler body section 301 by wireless transmission. The power receiving side coupler body portion 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 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 in alternating current to direct current. The load 5 is, for example, a storage battery, which is used in industrial equipment, portable electronic equipment, and the like. Examples of industrial equipment include electric vehicles, and examples of portable electronic equipment include laptop computers, smart phones, and portable music players.

The power transmission side reactance adjustment circuit 31, the power transmission side coupler body section 301, the power reception side coupler body section 302, and the power reception side reactance adjustment circuit 32 configure the coupling section 3 to provide electric field resonance wireless transmission.

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 transmission side flat plate electrode 11 and the second power transmission side plate electrode 12 shown in FIG. The side plate electrode 22 is held by the power receiving side coupler main body 302 .

A first capacitance Cm1 is formed between the first power transmission side plate electrode 11 and the first power reception side plate electrode 21, and a capacitance Cm1 is formed between the second power transmission side plate electrode 12 and the second power reception side plate electrode 22. A second capacitor Cm2 is formed at . Between the first power transmission side plate electrode 11 and the second power transmission side plate electrode 12, a first stray capacitance C11 is formed due to the formation of the electric field, and the first power reception side plate electrode 21 and the second power reception side plate electrode 21 are formed. A second stray capacitance C<b>21 is formed due to the formation of the electric field between the power receiving side flat plate electrode 22 .

The first power transmission side plate electrode 11 and the second power transmission side plate electrode 12 are collectively referred to as a pair of power transmission side 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 . A capacitance formed by the pair of power transmission side plate electrodes 10 and the pair of power reception side plate electrodes 20 is generally referred to as Cm.

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

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

The first power receiving side flat plate electrode 21 is connected to one terminal 501 on the power receiving side of the load 5 via the first power receiving side transmission line 201 and the 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 the second power receiving side transmission line 202 and the 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. A power receiving side reactance adjustment circuit 32 is formed by the first power receiving side coil L21, the second power receiving side coil L22, and the power receiving side capacitor C22.

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 .

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

Alternating current is transmitted from the power supply body 41 shown in FIG. Electric power is transmitted by storing or discharging electric charges in the first capacitor Cm1 and the second capacitor Cm2. Power is transmitted to the electric field resonance wireless power receiving device 2 via the first capacitor Cm1 and the second capacitor Cm2, and power is supplied to the load 5 .

In the first power transmission side transmission line 101 according to the present embodiment, the length between the first power transmission side coil L11 and the power transmission side capacitor C12 that constitute the reactance adjustment circuit is long. The transmission line 102 on the power transmission side has a long distance between the second coil L12 on the power transmission side and the capacitor C12 on the power transmission side that constitute the reactance adjustment circuit. A first power transmission side coil L11 and a second power transmission side coil L12 are arranged apart from the power transmission side electrode unit 301A. A first power transmission line 101 and a second power transmission line 102 are led out from the housing having the power transmission side coupler body 301 .

The power transmission side capacitor C12, the first power transmission side plate electrode 11, the second power transmission side plate electrode 12, the power transmission side housing 13 and the handle 17 shown in FIGS. 3 and 4 constitute the power transmission 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, and the like constitute the power receiving side electrode unit 302A.

The coupling part 3 according to the present embodiment is of a slot-in type in which electrodes on the power receiving side face each other and have a gap, and an electrode on the power transmitting side is inserted into the gap. The configuration and operation of this slot-in system will be described below with reference to FIG. In FIG. 3, the direction parallel to the electrode plane is taken as the X-axis and the Y-axis, and the direction in which the power transmission side plate electrode is inserted is taken as the X-axis direction. The direction perpendicular to the electrode plane is defined as the Z-axis direction. The Z-axis direction is called the upward direction.

The electric field resonance type wireless power receiving device 2 has a plate-like 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 respectively have a first power-receiving-side flat plate electrode 21 and a second power-receiving-side flat plate electrode 22 on opposing surfaces. 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.

The electric field resonance type wireless power transmission device 1 has a plate-shaped or box-shaped power transmission side housing 13 . The power transmission side housing|casing 13 has the 1st power transmission side plate electrode 11 and the 2nd power transmission side plate electrode 12 on the upper and lower surfaces, respectively. The surfaces of the first power transmission side plate electrode 11 and the second power transmission side plate electrode 12 are covered with a first high dielectric constant resin 15 and a second high dielectric constant resin 16, respectively. Coating the electrodes with these high dielectric constant resins prevents electrical short circuits.

When power is supplied, the power transmission side housing 13, the first power transmission side flat plate electrode 11, and the second power transmission side flat plate electrode 12 of the electric field resonance type wireless power transmission device 1 are connected to the first power reception side housing 23 and the second power reception side. It is inserted into the gap 27 with the housing 24 . The first power receiving side flat plate electrode 21 and the first power transmission side flat plate electrode 11 face each other to form the first capacitance Cm1 in FIG. The flat plate electrode 12 faces to form the second capacitor Cm2 in FIG.

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 transmission device 1 are opposed to each other with the power transmission side housing 13 interposed therebetween, and the first stray capacitance shown in FIG. Form C11. Furthermore, a power transmission side capacitor C12 is provided to connect 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 provided in the power transmission side housing 13 because it is smaller than the first power transmission side coil L11.

Alternating current is transmitted from the power transmission side power source. When a positive voltage is sent out and a positive charge is accumulated in the first power transmission side plate electrode 11 from the power source, a negative charge is induced in the first power reception side plate electrode 21 via the first capacitance Cm1. be. A negative voltage is then transmitted to the power receiving side. When a negative voltage is sent out and negative charges are accumulated in the first power transmission side plate electrode 11 from the power source, positive charges are induced in the first power reception side plate electrode 21 via the first capacitance Cm1. be. Then, a positive voltage is transmitted to the power receiving side. Then, AC power is transmitted to the power receiving side. AC power is similarly transmitted between the second power transmitting side flat plate electrode 12 and the second power receiving side flat plate electrode 22 . As described above, power from the power transmission side is transmitted to the power reception side device through the first capacitor Cm1 and the second capacitor Cm2.

As shown in FIG. 1 , a power transmission side coil L1 that is a combination of the first power transmission side coil L11 and the second power transmission side coil L12 is housed in the power supply housing 4 . The power transmission side coil L1 does not exist in the power transmission side electrode unit 301A. The power transmission side coupler main body 301 consists only of the first power transmission side plate electrode 11, the second power transmission side plate electrode 12, and the plate-like or box-like power transmission side housing 13. As shown in FIG. The power transmission side electrode unit 301A has a power transmission side coupler body portion 301 and a power transmission side capacitor C12.

It is conceivable that the coupler portion may be used by holding it in your hand. FIG. 4 shows a perspective view of one embodiment. This is the case, for example, when a coupler of an electric field resonance type wireless power transmission device is loaded into a charging coupler of an automobile at a power receiving station. A pair of power-transmitting-side transmission lines 100 come out from the power supply housing 4 and extend to the power-transmitting-side electrode unit 301A. A pair of power transmission side transmission lines 100 are connected to the first power transmission side flat plate electrode 11 and the second power transmission side plate electrode 12 (not shown) via the power transmission side housing 13 . The power transmission side electrode unit 301A is provided with a handle 17 because it is operated by hand. The power transmission side electrode unit 301A is inserted into the power reception side electrode unit 302A.

A power transmission side coil L<b>1 (not shown) is housed in the power supply housing 4 .

According to this embodiment, the handle 17 is simply rod-shaped and does not have a weight such as a coil. An electric field resonance type wireless power transmission device with excellent operability is realized.

As the power increases, the heat generated by the coil cannot be ignored. In the case of the configuration in which the power transmission side coil L1 is provided adjacent to the power transmission side coupler body portion 301, it becomes necessary to provide the coupler with a cooling structure and a heat dissipation structure, which may lead to an increase in size. In addition, high power causes heat dissipation problems. For example, if there is a mechanism that dissipates heat to the handle, there is a concern that the handle will become too hot to hold.

In the electric field resonance type wireless power transmission device according to the present embodiment, the cooling function of the cooling device 42 provided in the power supply housing 4 can be used by placing the power transmission side coil L1 in the power supply housing 4. be. Heating of the handle portion of the power transmission side electrode unit 301A and an increase in size can be avoided.

If a coaxial line is used for the pair of transmission lines 100 on the power transmission side, the critical distance between them is shortened. Therefore, it is desirable to use a balanced line as the transmission line. A decrease in transmission rate can be suppressed. A cross-linked polyethylene insulated vinyl sheath cable (CV cable) is preferably used as the balance line. It is also cheaper than coaxial cable.

FIG. 5 shows the transmission transmittance, reflectance, and loss in this embodiment. 5A, 5B, and 5C show the results of a comparative example in which the first power transmission side coil L11 and the power transmission side second power transmission side coil L12 are provided adjacent to the power transmission side coupler main body 301. FIG. The situation according to this embodiment is shown in FIGS. 5D, 5E, and 5F. Figures 5A and 5D show the efficiency. Figures 5B and 5E show the reflectance. Figures 5C and 5F show the losses.

Comparing FIG. 5A and FIG. 5D, in the electric field resonance type wireless power transmission device according to this embodiment, the decrease in efficiency is suppressed to 5% and the increase in loss is suppressed to 3%. Although the efficiency decreases due to the parasitic resistance of the extension, the decrease in efficiency is negligible considering the merits of size, weight, temperature, etc. described above.

It is effective to employ the electric field resonance type wireless power transmission system according to the present embodiment in a power supply system for automobiles. At the charging station, the driver operates the coupler for power transmission and inserts it into the coupler for power reception provided in the vehicle. The power transmission coupler is lightweight and can be easily operated by the driver.

(Modification 1)
It is preferable to make only the power transmission side coil L1 independent instead of providing the power transmission side coil L1 inside the power supply housing 4 . That is, it is preferable to arrange the power transmission side coil L1 between the power transmission side electrode unit 301A and the power supply housing 4 . If the power transmission side coil L1 generates heat without a cooling device and the weight is at a level that does not pose a problem, the power transmission side coil L1 can be regarded as a part of the cable, and the entire system can be constructed.

(Modification 2)
It is also preferable to provide the power transmission side capacitor C12 in the power supply housing 4 instead of providing it in the power transmission side electrode unit 301A. The size and weight of the power transmission side electrode unit 301A can be further reduced.
(Modification 3)
A configuration without the power transmission side capacitor C12 can also be adopted. Generally, in order to achieve resonance, it is necessary to optimize the product of the capacitance of the capacitor and the inductance of the coil, and the smaller the capacitance of the capacitor, the more inductance is required, resulting in an increase in the size of the coil. In this embodiment, since the power transmission side coil L1 is provided in the power supply housing 4 and does not affect the size and weight of the coupler section, increasing the size of the power transmission side coil L1 does not pose a problem. Since there is no power transmission side capacitor C12, the size and weight of the power transmission side electrode unit 301A can be reduced.

(Modification 4)
Embodiment 1 explained only the power transmission side coil L1. It is effective to separate the power-receiving-side coil L2 from the power-receiving-side electrode unit 302A and to house it in the housing of the load 5 . In many cases, a cooling device is provided in the housing of the load 5 as well. In this case, cooling of the power receiving side coil L2 can be performed at the same time. Similarly to the power transmission side electrode unit 301A, the power reception side electrode unit 302A can also be made thin and light. As in Modification 3, a configuration without the power receiving side capacitor C22 is also preferable.

(Modification 5)
Although Embodiment 1 and Modifications 1 to 5 have been described above, it is preferable to combine them as appropriate. It is possible to reduce the size and weight of the power transmission side electrode unit 301A and the power reception side electrode unit 302A.

(Embodiment 2)
In Embodiment 1, the electrodes on the power transmission side and the electrodes on the power reception side are arranged on planes parallel to each other. In the second embodiment, as shown in FIG. 6, the first power transmission side flat plate electrode 11 and the second power transmission 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.

An electric field is formed between the first power transmission side plate electrodes 11 and 12, and a first floating capacitance C11 shown in FIG. 2 is formed. 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, forming a second stray capacitance C21.

During power supply, the first power transmission side flat plate electrode 11 of the electric field resonance type wireless power transmission device 1 faces the first power reception side plate electrode 21 of the electric field resonance type wireless power reception device 2, and the second power transmission side plate electrode 21 of the electric field resonance type wireless power transmission device 1 faces. It is preferable that the power transmission side flat plate electrode 12 has a positional relationship facing the second power reception side plate electrode 22 of the electric field resonance type wireless power receiving device 2 .

The pair of power transmission side flat plate electrodes 10 are connected to the power source body 41 via the first power transmission side coil L11 or the second power transmission side coil L12, and the pair of power reception side plate electrodes 20 are connected to the first power reception side coil. It is connected to the load 5 via the coil L21 or the second power receiving side coil L22.

The first power transmission side plate electrode 11 and the second power transmission side plate electrode 12 constitute the power transmission side coupler main body 301, and the first power reception side plate electrode 21 and the second power reception side plate electrode 22 constitute the power receiving side. A coupler main body 302 is constructed.

In Embodiments 1 and 2, the power transmission side flat plate electrode and the power reception side plate electrode are applied as the power transmission side electrode and the power reception side electrode. Here, the shape of the electrodes is not limited to a flat plate as long as the power transmission side electrode and the power reception side electrode form a capacitor. For example, curved or spherical electrodes can be employed.

The electric field resonance type wireless power transmission device according to the embodiment described above has the following effects.

The electric field resonance type wireless power transmission device 1 includes a power transmission side electrode unit 301A including a pair of power transmission side electrodes 10, and a power transmission side coil L1 spaced apart from the power transmission side electrode unit 301A.

The power transmission side electrode unit 301A is reduced in size and weight by separating the power transmission side coil L1 having a large mass from the power transmission side electrode unit 301A. Moreover, the power transmission side electrode unit 301A does not become hot due to the power transmission side coil L1, which is a heat source. Alternatively, there is no need to provide the power transmission side electrode unit 301A with a cooling device for cooling the power transmission side coil L1, which is a heat source, and for this reason also, the power transmission side electrode unit 301A can be reduced in size and weight.

The electric field resonance type wireless power transmission device 1 further includes a power source housing 4 that houses a power source main body 41 , and a power transmission side coil L<b>1 is arranged inside the power source housing 4 .

The power transmission side coil L<b>1 that is a heating element can be cooled by a cooling device 42 provided in the power supply housing 4 .

The electric field resonance type wireless power transmission device 1 further includes a power source housing 4 that houses a power source main body 41 , and the power transmission side coil L<b>1 is arranged apart from the power source housing 4 .

An increase in the weight of the power supply housing 4 can be prevented.

In the electric field resonance type wireless power transmission device 1, a pair of power transmission side transmission lines 100 connecting a pair of power transmission side plate electrodes 10 and a power transmission side coil L1 is composed of a balanced line.

Reduction in transmission efficiency can be suppressed.

An electric field resonance type wireless power transmission system S includes the above-described electric field resonance type wireless power transmitting device 1 and an electric field resonance type wireless power receiving device 2 to which electric power is transmitted from the electric field resonance type wireless power transmitting device 1 .

The power transmission side electrode unit 301A is small and light, and the power transmission side coil L1 is cooled by the cooling device 42 provided in the power supply housing 4, thereby obtaining an electric field resonance type wireless power transmission system with high transmission efficiency.

An electric field resonance type wireless power transmission system has an electrode unit consisting of a pair of power receiving side flat plate electrodes corresponding to a pair of power transmission side plate electrodes, and a power receiving side coil spaced apart from the electrode unit. Equipped with a powered device

The power receiving side electrode unit 302A is reduced in size and weight.

The disclosure is capable of various embodiments and modifications without departing from the broader spirit and scope of the invention. Moreover, the embodiment described above is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims rather than the embodiments. Various modifications made within the scope of the claims and within the scope of equivalent disclosure are considered to be within the scope of the present invention.

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 transmission side flat plate electrodes 11 first power transmission side flat plate electrode 12 second second Power transmission side plate electrode 20 Pair of power reception side plate electrodes 21 First power reception side plate electrode 22 Second power reception side plate electrode 41 Power supply main body 301 Power transmission side coupler main body 301A Power transmission side electrode unit 302 Power reception side side coupler main body 302A power receiving side electrode unit L1 power transmitting side coil L11 first power transmitting side coil L12 second power transmitting side coil L2 power receiving side coil L21 first power receiving side coil L22 second power receiving side Side coil, S Electric field resonance type wireless power transmission system

Claims (7)

an electrode unit including a pair of power transmission side electrodes;
and a power transmission side coil arranged apart from the electrode unit. The electric field resonance type wireless power transmission device according to claim 1, wherein the pair of power transmission side electrodes is a pair of flat plate electrodes. further comprising a power supply housing that houses the power supply,
3. The electric field resonance type wireless power transmission device according to claim 1, wherein the power transmission side coil is arranged inside the power supply housing. further comprising a power supply housing that houses the power supply,
3. The electric field resonance wireless power transmission device according to claim 1, wherein the power transmission side coil is arranged between the electrode unit and the power supply housing. The electric field resonance type wireless power transmission device according to any one of claims 1 to 4, wherein a power transmission side transmission line connecting the power transmission side plate electrode and the power transmission side coil is composed of a balanced line. an electric field resonance type wireless power transmission device according to any one of claims 1 to 5;
an electric field resonance type wireless power receiving device to which electric power is transmitted from the electric field resonance type wireless power transmitting device;
An electric field resonance type wireless power transmission system. The electric field resonance type wireless power receiving device,
an electrode unit comprising a pair of power receiving side electrodes corresponding to the pair of power transmitting side electrodes;
7. The electric field resonance type wireless power transmission system according to claim 6, further comprising a power receiving side coil arranged apart from the electrode unit.

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