JP2022158383A - Wireless power receiving device, wireless power transmission device, and wireless power transmission system - Google Patents

Abstract

To provide a wireless power receiving device, a wireless power transmission device, and a wireless power transmission system in which a housing for housing electrodes can be made thinner.SOLUTION: A wireless power transmission system 100 includes a wireless power transmission device 1 capable of transmitting electric power by an electric field coupling method, and a wireless power receiving device 2 capable of receiving power transmitted from the wireless power transmission device 1, and the wireless power transmission device 1 includes a power transmission side electrode 10, a power transmission side coil L1 electrically connected to the power transmission side electrode 10, a power transmission side first housing 110 that houses the power transmission side electrode 10, and a power transmission side second housing 120 that houses the power transmission side coil L1, and the wireless power receiving device 2 includes a power receiving side electrode 20, a power receiving side coil L2 electrically connected to the power receiving side electrode 20, a power receiving side first housing 130 that houses the power receiving side electrode 20, and a power receiving side second housing 140 that houses the power receiving side coil L2.SELECTED DRAWING: Figure 3

Description

The present invention relates to a wireless power receiving device, a wireless power transmitting device, and a wireless power transmission system.

2. Description of the Related Art In recent years, with the spread of mobile phones, electric vehicles, and the like, wireless power transmission systems that supply power wirelessly have been actively developed. For example, Patent Documents 1 to 3 describe a wireless power transmission system including a wireless power transmission device and a wireless power reception device having electrodes and coils housed in a housing.

WO2013/046366 JP 2016-115789 A Patent No. 5786949

By the way, in the wireless power transmission system using the electric field coupling method, although the transmission efficiency can be improved by increasing the area of the electrodes, the housing for accommodating the electrodes will be increased in size. For example, when this wireless power transmission system is applied to a device with a limited installation space or a mobile object such as an electric vehicle, it is desirable to further reduce the size of the housing that accommodates the electrodes. The techniques of Patent Documents 1 to 3 have room for improvement in terms of further reducing the thickness of the housing that accommodates the electrodes.

An object of the present invention is to provide a wireless power receiving device, a wireless power transmitting device, and a wireless power transmission system in which a housing that accommodates electrodes can be made thinner.

The present invention comprises a power receiving side electrode, a power receiving side coil electrically connected to the power receiving side electrode, a power receiving side first housing that houses the power receiving side electrode, and a power receiving side first housing that houses the power receiving side coil. The present invention relates to a wireless power receiving device including two housings and capable of receiving electric power by an electric field coupling method.

The second power receiving side housing may have higher electrical conductivity and thermal conductivity than the first power receiving side housing.

The power-receiving-side second housing is formed on the surface of the power-receiving-side first housing, and includes an insertion hole through which a transmission line connecting the power-receiving-side electrode and the power-receiving-side coil is inserted, and a peripheral portion of the insertion hole. At least both ends of the insertion hole in the axial direction may be curved.

The through hole may be formed to extend along the transmission line, and the axial length of the through hole may be longer than the thickness of the surface on which the through hole is formed.

Further, the present invention includes a power transmission side electrode, a power transmission side coil electrically connected to the power transmission side electrode, a power transmission side first housing that accommodates the power transmission side electrode, and a power transmission side that accommodates the power transmission side coil. and a second housing, and relates to a wireless power transmitting device capable of transmitting electric power by an electric field coupling method.

The second power transmission side housing may have higher electrical conductivity and thermal conductivity than the first power transmission side housing.

The power transmission side second housing is formed on a surface on the power transmission side first housing side, and includes an insertion hole through which a transmission line connecting the power transmission side electrode and the power transmission side coil is inserted, and a peripheral portion of the insertion hole. At least both ends of the insertion hole in the axial direction may be curved.

The through hole may be formed to extend along the transmission line, and the axial length of the through hole may be longer than the thickness of the surface on which the through hole is formed.

Further, the present invention includes a wireless power transmission device capable of transmitting electric power by an electric field coupling method, and a wireless power receiving device capable of receiving power transmitted from the wireless power transmission device, wherein the wireless power transmission device includes a power transmission side electrode. a power transmission side coil electrically connected to the power transmission side electrode; a power transmission side first housing that houses the power transmission side electrode; and a power transmission side second housing that houses the power transmission side coil. , the wireless power receiving device includes a power receiving side electrode, a power receiving side coil electrically connected to the power receiving side electrode, a power receiving side first housing that houses the power receiving side electrode, and the power receiving side coil. and a power receiving side second housing.

Advantageous Effects of Invention According to the present invention, it is possible to provide a wireless power receiving device, a wireless power transmitting device, and a wireless power transmission system in which a housing that accommodates electrodes can be made thinner.

1 is a configuration diagram showing a wireless power transmission system according to one embodiment of the present invention; FIG. 1 is a schematic diagram of a circuit configuration of a wireless power transmission system according to one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of the wireless power transmission system according to one embodiment of the present invention cut along the XZ plane shown in FIG. 1; 3 is an enlarged cross-sectional view of an insertion hole and its vicinity of a wireless power receiving device according to an embodiment of the present invention; FIG. 3 is an enlarged cross-sectional view of an insertion hole and its vicinity of a wireless power receiving device according to an embodiment of the present invention; FIG. FIG. 5 is an enlarged cross-sectional view of an insertion hole and its vicinity in a first modification of the wireless power receiving device according to the embodiment of the present invention; FIG. 9 is an enlarged cross-sectional view of an insertion hole and its vicinity in a second modification of the wireless power receiving device according to the embodiment of the present invention;

(Embodiment)
A wireless power transmission system according to an embodiment of the present invention will be described below. It should be noted that the present invention is not limited by the following embodiments. In addition, each drawing referred to in the following description only schematically shows the shape, size, and positional relationship to the extent that the contents of the present invention can be understood. That is, the present invention is not limited only to the shapes, sizes, and positional relationships illustrated in each drawing. 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-axis direction is the Y-axis direction, and the direction orthogonal to the electrode plane is the Z-axis direction. .

First, the overall configuration of a wireless power transmission system 100 according to this embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a configuration diagram of a wireless power transmission system 100. As shown in FIG. FIG. 2 is a schematic diagram of the circuit configuration of the wireless power transmission system 100. As shown in FIG.

A wireless power transmission system 100 includes a wireless power transmission device 1 and a wireless power reception device 2 . The wireless power transmission system 100 may be a system that transmits power in a state where the wireless power transmission device 1 and the wireless power reception device 2 are brought close to each other. It may be a slot-in type coupler that transmits power while inserted. In this embodiment, a wireless power transmission device 1 is provided on the ground of a parking space, and a wireless power reception device 2 is mounted on a mobile object such as an electric vehicle, and wirelessly transmits power to the mobile object parked in the parking space. A system will be described as an example. In this embodiment, the wireless power transmitting device 1 is provided on the ground, and the wireless power receiving device 2 is mounted on a mobile object parked on the ground, so the Z-axis direction is the vertical direction.

The wireless power transmission device 1 will be described. The wireless power transmission device 1 includes a power transmission side electrode 10, a power transmission side coil L1, transmission lines 31 to 34 that are the transmission line 30, a power supply 3, a power transmission side first housing 110, and a power transmission side second housing 120. And prepare. In FIG. 1, the first power transmission side housing 110, the second power transmission side housing 120, the first power receiving side housing 130, and the second power receiving side housing 140, which will be described later, are illustrated with dashed lines.

The power transmission side electrode 10 has a flat power transmission side first electrode 11 and a flat power transmission side second electrode 12 . The power transmission side first electrode 11 and the power transmission side second electrode 12 are arranged on the same plane (on the XY plane in FIG. 1) with a space therebetween.

The power transmission side coil L1 is electrically connected to the power transmission side electrode 10 . The power transmission side coil L1 has a power transmission side first coil L11 and a power transmission side second coil L12.

The power transmission side first coil L11 is connected to the power transmission side first electrode 11 via a transmission line 31, as shown in FIGS. That is, the transmission line 31 connects the power transmission side first electrode 11 and the power transmission side first coil L11.

The power transmission side second coil L12 is connected to the power transmission side second electrode 12 via a transmission line 32, as shown in FIGS. That is, the transmission line 32 connects the power transmission side second electrode 12 and the power transmission side second coil L12.

The power supply 3 is an AC power supply that supplies AC power to the power transmission side coil L1 and the power transmission side electrode 10 . The power supply 3 has terminals 4 and 5 . As shown in FIG. 2, a transmission line 33 is connected to the terminal 4 . A power transmission side first coil L11 is connected to the end of the transmission line 33 opposite to the side to which the terminal 4 is connected. That is, as shown in FIGS. 1 and 2, the power transmission side first electrode 11 is connected to the power source 3 via the transmission line 31, the power transmission side first coil L11, and the transmission line 33 in this order. On the other hand, a transmission line 32 is connected to the terminal 5 . A power transmission side second coil L12 is connected to the end of the transmission line 32 opposite to the side to which the terminal 5 is connected. That is, as shown in FIGS. 1 and 2, the power transmission side second electrode 12 is connected to the power source 3 via the transmission line 32, the power transmission side second coil L12, and the transmission line 34 in this order. Electric power sent from the power source 3 is transmitted to the power transmission side electrode 10 via the transmission line 30 and the power transmission side coil L1.

The power transmission side first housing 110 is box-shaped and accommodates the power transmission side electrode 10 . The power transmission side second housing 120 is box-shaped and accommodates the power transmission side coil L<b>1 and the power source 3 . The power transmission side second housing 120 is arranged at a position adjacent to the power transmission side first housing 110 . In this embodiment, the power transmission side first housing 110 and the power transmission side second housing 120 are connected to each other. The configuration of the power transmission side first housing 110 and the power transmission side second housing 120 will be described later.

The wireless power receiving device 2 will be described. The wireless power receiving device 2 includes a power receiving side electrode 20, a power receiving side coil L2, transmission lines 41 to 44 that are the transmission line 40, a power receiving side first housing 130, and a power receiving side second housing 140. 6. The load 6 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 receiving side electrode 20 has a flat power receiving side first electrode 21 and a flat power receiving side second electrode 22 . The power-receiving-side first electrode 21 and the power-receiving-side second electrode 22 are arranged on the same plane (on the XY plane in FIG. 1) with a space therebetween.

The power receiving side coil L2 is electrically connected to the power receiving side electrode 20 . The power receiving side coil L2 has a power receiving side first coil L21 and a power receiving side second coil L22.

The power receiving side first coil L21 is connected to the power receiving side first electrode 21 via a transmission line 41, as shown in FIGS. That is, the transmission line 41 connects the power receiving side first electrode 21 and the power receiving side first coil L21.

The power receiving side second coil L22 is connected to the power receiving side second electrode 22 via a transmission line 42, as shown in FIGS. That is, the transmission line 42 connects the power receiving side second electrode 22 and the power receiving side second coil L22.

The load 6 has terminals 7 and 8 . As shown in FIG. 2, a transmission line 43 is connected to the terminal 7 . A power-receiving-side first coil L21 is connected to the end of the transmission line 43 opposite to the side to which the terminal 7 is connected. That is, as shown in FIGS. 1 and 2, the power receiving side first electrode 21 is connected to the load 6 via the transmission line 41, the power receiving side first coil L21, and the transmission line 43 in this order. On the other hand, a transmission line 44 is connected to the terminal 8 . A power receiving side second coil L22 is connected to the end of the transmission line 44 opposite to the side to which the terminal 8 is connected. That is, as shown in FIGS. 1 and 2, the power receiving side second electrode 22 is connected to the load 6 via the transmission line 42, the power receiving side second coil L22, and the transmission line 44 in this order.

The power receiving side first housing 130 is box-shaped and accommodates the power receiving side electrode 20 . The power receiving side second housing 140 is box-shaped and accommodates the power receiving side coil L2 and the load 6 . The second power receiving side housing 140 is arranged at a position adjacent to the first power receiving side housing 130 . In this embodiment, the power receiving side first housing 130 and the power receiving side second housing 140 are connected to each other. The detailed configuration of the first power receiving side housing 130 and the second power receiving side housing 140 will be described later.

As shown in FIG. 1, by arranging the power transmission side electrode 10 and the power reception side electrode 20 so as to face each other with a gap, electric power can be transmitted from the wireless power transmission device 1 to the wireless power reception device 2 by the electric field coupling method. state. At the time of power transmission by this electric field coupling method, the power transmitted to the power transmission side electrode 10 of the wireless power transmission device 1 is transmitted to the power reception side electrode 20 of the wireless power reception device 2 . The power transmitted to the power receiving side electrode 20 is transmitted to the load 6 via the transmission line 40 and the power receiving side coil L2.

Next, details of electric power transmission by the electric field coupling method of the wireless power transmission system 100 will be described with reference to FIG.

When power is transmitted from the power source 3 with the power transmission side electrode 10 and the power reception side electrode 20 facing each other, a capacitance _Cm1 is formed between the power transmission side first electrode 11 and the power reception side first electrode 21, A capacitance _Cm2 is formed between the second electrode 12 and the second electrode 22 on the power receiving side. Since AC power is transmitted from the power supply 3 , electric charge is stored in or discharged from the capacitance _{Cm1 and the capacitance Cm2 ,} whereby electric power is transmitted from the wireless power transmission device 1 to the wireless power reception device 2, and the load 6 is supplied with electric power. is supplied. Specifically, when a positive voltage is sent from the power source 3 and a positive charge from the power source 3 is accumulated in the power transmitting side first electrode 11, a negative charge is generated in the power receiving side first electrode 21 via the capacitance _Cm1 . induced. A negative voltage is then transmitted to the wireless power receiving device 2 . When a negative voltage is sent from the power source 3 and negative charges from the power source 3 are accumulated in the power transmitting side first electrode 11, positive charges are induced in the power receiving side first electrode 21 via the capacitance _Cm1 . Then, the positive voltage is transmitted to the wireless power receiving device 2 . Then, AC power is transmitted to the wireless power receiving device 2 . AC power is similarly transmitted between the power transmission side second electrode 12 and the power reception side second electrode 22 . That is, a resonance circuit is formed by the power transmission side coil L1, the power reception side coil L2, the capacitance C _m1 , the capacitance C _m2 , etc., and electric power is transmitted by the electric field coupling method. As described above, the power transmitted from the wireless power transmitting device 1 is transmitted to the wireless power receiving device 2 through the capacitance C _m1 and the capacitance C _m2 .

Next, detailed configurations of the first power receiving side housing 130 and the second power receiving side housing 140 of the wireless power receiving device 2 and the first power transmitting side housing 110 and the second power transmitting side housing 120 of the wireless power transmitting device 1 are described. Description will be made with reference to FIGS. 1 and 3. FIG. FIG. 3 is a cross-sectional view of the wireless power transmission system 100 taken along the XZ plane shown in FIG.

First, the configuration of the first power receiving side housing 130 and the second power receiving side housing 140 of the wireless power receiving device 2 will be described.

The wireless power receiving device 2 of this embodiment is arranged at the bottom of the mobile body. Specifically, the power receiving side second housing 140 is located inside the moving object. On the other hand, the power receiving side first housing 130 needs to form capacitances C _m1 and C _m2 between the power receiving side electrode 20 and the power transmitting side electrode 10 of the wireless power transmitting device 1 when power is supplied. located near it.

The first power receiving side housing 130 includes an electrode holding plate 131 holding the power receiving side electrode 20, a first adjacent plate 132 facing the electrode holding plate 131, and a side plate 133 extending from the electrode holding plate 131 to the first adjacent plate 132. Consists of In an internal space 134 surrounded by the electrode holding plate 131, the first adjacent plate 132, and the side plate 133, the power receiving side first electrode 21, the power receiving side second electrode 22, and part of the transmission lines 41 and 42 are arranged. be.

The electrode holding plate 131 is a surface facing the power transmission side first electrode 11 and the power transmission side second electrode 12 when power is received from the wireless power transmission device 1 . As shown in FIG. 3, a first power receiving electrode 21 and a second power receiving electrode 22 are attached to the inner surface of the electrode holding plate 131 with a gap therebetween. The electrode holding plate 131 is preferably made of insulating non-metal or the like in order to form the capacitances C _m1 and C _m2 . The power receiving side first housing 130 of the present embodiment is made of resin.

The first adjacent plate 132 is a surface adjacent to the power receiving side second housing 140 . Insertion holes 71 and 72, which are insertion holes 70 through which the transmission line 40 is inserted, are formed in the first adjacent plate 132 . Specifically, as shown in FIG. 3, the first adjacent plate 132 is formed with an insertion hole 71 through which the transmission line 41 is inserted and an insertion hole 72 through which the transmission line 42 is inserted.

The second housing 140 on the power receiving side includes a second adjacent plate 141 adjacent to the first adjacent plate 132, a top surface 142 facing the second adjacent plate 141, and a side plate 143 extending from the second adjacent plate 141 to the top surface 142. Consists of In an internal space 144 surrounded by the second adjacent plate 141, the top surface 142, and the side plate 143, the power receiving side coil L2, parts of the transmission lines 41 and 42, the transmission lines 43 and 44, and the load 6 are arranged. be.

The second adjacent plate 141 is connected to the first adjacent plate 132 of the power receiving side first housing 130 . As shown in FIG. 3, the second adjacent plate 141 is formed with insertion holes 81 and 82 which are the insertion holes 80 through which the transmission line 40 is inserted. Specifically, as shown in FIG. 3, the second adjacent plate 141 is formed with an insertion hole 81 through which the transmission line 41 is inserted and an insertion hole 82 through which the transmission line 42 is inserted. The insertion hole 81 is formed at a position where its central axis substantially coincides with the central axis of the insertion hole 71 . The insertion hole 82 is formed at a position where its central axis substantially coincides with the central axis of the insertion hole 72 .

In this embodiment, the power receiving side electrode 20 and the power receiving side coil L2, which constitute the electric circuit of the electric field coupling method on the power receiving side, are accommodated in different housings. With this configuration, the thickness d1 of the first power receiving side housing 130 that accommodates the power receiving side electrode 20 that needs to be opposed to the power transmitting side electrode 10 during power supply can be made thinner.

In addition, it is preferable that the power receiving side second housing 140 has higher electrical conductivity and thermal conductivity than the power receiving side first housing 130 . The power receiving side second housing 140 of the present embodiment is made of metal. The second power receiving side housing 140 of the present embodiment is separate from the moving body and arranged inside the moving body, but may be the moving body itself.

In this embodiment, the power receiving side second housing 140 that houses the power receiving side coil L2 is made of metal and has conductivity, so that noise generated from the power receiving side coil L2 can be shielded. In addition, since the power receiving side second housing 140 has high thermal conductivity, the heat generated from the power receiving side coil L2 can be released to the outside. Deformation or the like of the housing 140 itself can be suppressed.

Next, the detailed structure of the insertion hole 80 formed in the second power receiving side housing 140 will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of the insertion hole 80 of the wireless power receiving device 2 and its vicinity in the area A surrounded by the two-dot chain line shown in FIG. FIG. 4 shows a state in which an alternating current is flowing through the transmission line 41 . The insertion hole 81 and the insertion hole 82 of the insertion hole 80 have the same structure, so the insertion hole 81 shown in FIG. 4 will be described, and the description of the insertion hole 82 will be omitted.

As shown in FIG. 4, at least end portions 812 and 813, which are both ends of the insertion hole 81 in the axial direction DX, of the peripheral portion 811 of the insertion hole 81 are curved. Specifically, in the present embodiment, the insertion hole 81 is formed so as to increase in diameter toward both sides in the axial direction DX. In other words, the peripheral edge portion 811 of the insertion hole 81 formed in the second adjacent plate 141 is formed so as to separate from the central axis of the insertion hole 81 toward both sides in the axial direction DX.

Here, electric field concentration occurring at the peripheral edge portion 811 of the insertion hole 81 when the second power receiving side housing 140 has high conductivity will be described. FIG. 5 is an enlarged cross-sectional view of an insertion hole 81' having a constant diameter in the axial direction DX and its vicinity. End portions 812' and 813', which are both ends in the axial direction DX, of the peripheral edge portion 811' of the insertion hole 81' shown in FIG. formed at right angles. When the electrical conductivity of the second housing 140' on the power receiving side is high and the insertion hole 81' has the shape shown in FIG. Easy to concentrate.

On the other hand, in this embodiment, as shown in FIG. 4, the ends 812 and 813 of the peripheral portion 811 are curved. With this configuration, even when the electrical conductivity of the second power receiving side housing 140 is high, electric field concentration generated at the ends 812 and 813 of the peripheral portion 811 can be suppressed. Therefore, the insertion hole for inserting the transmission line 40 into the first power receiving side housing 130 in which the power receiving side electrode 20 is accommodated while shielding the noise generated from the power receiving side coil L2 in the second power receiving side housing 140 Electric field concentration occurring at 80 can be suppressed.

Next, the power transmission side first casing 110 and the power transmission side second casing 120 of the wireless power transmission device 1 will be described. The wireless power transmission device 1 of this embodiment is installed in a parking space of a mobile object. Specifically, the wireless power transmission device 1 is installed on the ground of the parking space so that the power transmission side first housing 110 is positioned above the power transmission side second housing 120 .

The power transmission side first housing 110 includes an electrode holding plate 111 holding the power transmission side electrode 10, a first adjacent plate 112 facing the electrode holding plate 111, and a side plate 113 extending from the electrode holding plate 111 to the first adjacent plate 112. Consists of In an internal space 114 surrounded by the electrode holding plate 111, the first adjacent plate 112, and the side plate 113, the power transmission side first electrode 11, the power transmission side second electrode 12, and part of the transmission lines 31 and 32 are arranged. be.

The electrode holding plate 111 is a surface facing the power receiving side first electrode 21 and the power receiving side second electrode 22 when power is transmitted to the wireless power receiving device 2 . As shown in FIG. 3 , the power transmission side first electrode 11 and the power transmission side second electrode 12 are attached to the inner surface of the electrode holding plate 111 with a space therebetween. The electrode holding plate 111 is preferably made of insulating non-metal or the like in order to form the capacitances C _m1 and C _m2 . The power transmission side first housing 110 of the present embodiment is made of resin.

The first adjacent plate 112 is a surface adjacent to the power transmission side second housing 120 . The first adjacent plate 112 is formed with insertion holes 51 and 52 which are the insertion holes 50 through which the transmission line 30 is inserted. Specifically, as shown in FIG. 3, the first adjacent plate 112 is formed with an insertion hole 51 through which the transmission line 31 is inserted and an insertion hole 52 through which the transmission line 32 is inserted.

The power transmission side second housing 120 includes a second adjacent plate 121 adjacent to the first adjacent plate 112, a bottom surface 122 facing the second adjacent plate 121, and side plates 123 extending from the first adjacent plate 112 to the bottom surface 122. consists of In an internal space 124 surrounded by the second adjacent plate 121, the bottom surface 122, and the side plate 123, the power transmission side coil L1, parts of the transmission lines 31 and 32, transmission lines 33 and 34, and the power supply 3 are arranged. .

The second adjacent plate 121 is connected to the first adjacent plate 112 of the power transmission side first housing 110 . As shown in FIG. 3, the second adjacent plate 121 is formed with insertion holes 61 and 62, which are the insertion holes 60 through which the transmission line 30 is inserted. Specifically, as shown in FIG. 3, the second adjacent plate 121 is formed with an insertion hole 61 through which the transmission line 31 is inserted and an insertion hole 62 through which the transmission line 32 is inserted. The insertion hole 61 is formed at a position where its central axis substantially coincides with the central axis of the insertion hole 51 . The insertion hole 62 is formed at a position where its central axis substantially coincides with the central axis of the insertion hole 52 . Note that the structure of the insertion hole 60 is the same as the structure of the insertion hole 80 described above, and a description thereof will be omitted.

In this embodiment, the power transmission side electrode 10 and the power transmission side coil L1, which constitute the electric circuit of the electric field coupling method on the power transmission side, are accommodated in different housings. With this configuration, the thickness d2 of the first housing 110 on the power transmission side that houses the electrode 10 on the power transmission side, which needs to be opposed to the electrode 20 on the power reception side during power supply, can be made thinner.

Moreover, it is preferable that the power transmission side second housing 120 has higher electrical conductivity and thermal conductivity than the power transmission side first housing 110 . The power transmission side second housing 120 of the present embodiment is made of metal.

In the embodiment described above, the following modifications can be adopted for the configuration of the insertion hole 80 formed in the second power receiving side housing 140 . The configuration of the insertion hole of the modified example will be described with reference to the above description. Note that, in the following description, components corresponding to those of the second power receiving side housing 140 have the same regularity and are given corresponding reference numerals. The explanation may be omitted or incorporated. In addition, the configuration of the insertion hole 60 formed in the second power transmission side housing 120 can be the same as that of the second power receiving side housing 140 described below.

First, a first modified example will be described with reference to FIG. FIG. 6 is a cross-sectional view showing an insertion hole 80A of a second power receiving side housing 140A and its vicinity according to a first modification.

The second power receiving side housing 140A differs from the second power receiving side housing 140 mainly in the configuration of the insertion hole 80A.

As shown in FIG. 6, the insertion hole 81A is formed in the second adjacent plate 141A, and the transmission line 40 is inserted therethrough. Also, the length d4 of the insertion hole 81A in the axial direction DX is formed longer than the thickness d3 of the second adjacent plate 141A in which the insertion hole 80A is formed.

The insertion hole 81A includes a through hole 814 that penetrates the second adjacent plate 141A, and cylindrical portions 815 that are formed on both sides of the second adjacent plate 141A and extend from the periphery of the through hole 814 in a direction away from the second adjacent plate 141A. , 816 and . Cylindrical portions 815 and 816 are formed so as to increase in diameter with increasing distance from second adjacent plate 141A. For this reason, end portions 812A and 813A, which are both ends in the axial direction DX, of the peripheral portion 811A of the insertion hole 80A are curved.

80 A of insertion holes of a 1st modification may be formed by the following methods, for example. First, through holes 814 are formed in the second adjacent plate 141A. A cylindrical member having an inner diameter substantially equal to that of the through hole 814 is connected to both sides of the second adjacent plate 141A so as to be positioned coaxially with the through hole 814 . By bending the end portion of the tubular member on the side opposite to the second adjacent plate 141A in the direction in which the tubular member expands in diameter, cylindrical portions 815 and 816 that increase in diameter as they move away from the second adjacent plate 141A are formed. be done.

Next, a second modified example will be described with reference to FIG. FIG. 7 is a cross-sectional view showing an insertion hole 80B of a second power receiving side housing 140B and its vicinity according to a second modification.

The second power receiving side housing 140B differs from the second power receiving side housing 140 mainly in the configuration of the insertion hole 80B.

As shown in FIG. 7, the insertion hole 81B is formed in the second adjacent plate 141B, and the transmission line 40 is inserted therethrough. Insertion hole 81B is formed to extend along transmission line 40 . A length d4 of the insertion hole 81B in the axial direction DX is formed longer than a thickness d3 of the second adjacent plate 141B in which the insertion hole 81B is formed. A peripheral edge portion 811B of the insertion hole 81B has curved end portions 812B and 813B, which are both ends in the axial direction DX.

Specifically, the insertion hole 81B is a through hole 814B that penetrates the second adjacent plate 141B, and is formed on both side surfaces of the second adjacent plate 141B in a direction away from the second adjacent plate 141B from the peripheral edge of the through hole 814B. and cylindrical portions 815B and 816B extending to the

The diameters of the cylindrical portions 815B and 816B are constant on the side of the second adjacent plate 141B, and on the side opposite to the second adjacent plate 141B in the axial direction DX, the diameter increases as the distance from the second adjacent plate 141B increases. That is, the insertion hole 81B has a constant diameter on the center side in the axial direction DX, and increases in diameter on both sides in the axial direction DX as it moves away from the second adjacent plate 141B. In addition, as shown in FIG. 7, the length d5 in the axial direction DX of the cylindrical portions 815, 816B on the side of the second adjacent plate 141B is longer than the thickness d3 of the second adjacent plate 141B.

Since the insertion hole 81B is formed to extend along the transmission line 40 with a constant diameter longer than the thickness d3 of the second adjacent plate 141B in the axial direction DX, noise radiated from the transmission line 40 to the outside can be blocked. .

According to this embodiment, the following effects are achieved.

The wireless power receiving device 2 according to the present embodiment includes a power receiving side electrode 20, a power receiving side coil L2 electrically connected to the power receiving side electrode 20, a power receiving side first housing 130 that houses the power receiving side electrode 20, A second power receiving side housing 140 that houses the power receiving side coil L2 is provided, and power can be received by an electric field coupling method.

As a result, the power receiving side electrode 20 and the power receiving side coil L2, which constitute the power receiving side electric field coupling type electric circuit, are housed in different housings, respectively, so that the thickness d1 of the power receiving side first housing 130 can be made thinner. . For example, when the wireless power receiving device 2 is mounted on the bottom of a moving object as in the above embodiment, the power receiving side first housing 130 that accommodates the power receiving side electrode 20 that needs to be opposed to the power transmitting side electrode 10 when power is supplied is provided. Since it can be made thinner, it is possible to suppress a decrease in ground clearance of the moving body.

Further, in the wireless power receiving device 2 according to the present embodiment, the second power receiving side housing 140 has higher electrical conductivity and thermal conductivity than the first power receiving side housing 130 .

As a result, since the power receiving side coil L2 is housed in a housing having higher electrical and thermal conductivity, it is possible to suppress a decrease in transmission efficiency and deformation of the housing due to heat generation of the power receiving side coil L2. Leakage of generated noise to the outside can be suppressed.

Further, in the wireless power receiving device 2 according to the present embodiment, the power receiving side second housing 140 is formed on the second adjacent plate 141 on the power receiving side first housing 130 side, and the power receiving side electrode 20 and the power receiving side coil L2 are connected to each other. An insertion hole 80 through which the transmission lines 41 and 42 to be connected are inserted is provided, and at least both ends 812 and 813 of the insertion hole 80 in the axial direction DX of the peripheral portion 811 of the insertion hole 80 are curved.

As a result, even when the electrical conductivity of the second power receiving side housing 140 is high, the end portions 812 and 813 of the peripheral portion 811 of the insertion hole 80 through which the transmission lines 41 and 42 are inserted are curved. Electric field concentration generated at both ends of the insertion hole can be suppressed.

Further, in the wireless power receiving device 2 according to the present embodiment, the insertion hole 80 is formed to extend along the transmission lines 41 and 42, and the length of the insertion hole 80 in the axial direction DX is equal to the length of the insertion hole 80 formed. is longer than the thickness of the second adjacent plate 141 .

As a result, the emission of noise generated from the transmission line 40 to the outside can be suppressed.

The wireless power transmission device 1 according to the present embodiment includes a power transmission side electrode 10, a power transmission side coil L1 electrically connected to the power transmission side electrode 10, a power transmission side first housing 110 that houses the power transmission side electrode 10, A power transmission side second housing 120 that accommodates the power transmission side coil L1 is provided, and electric power can be transmitted by an electric field coupling method.

As a result, since the power transmission side electrode 10 and the power transmission side coil L1 that constitute the power transmission side electric field coupling type electric circuit are housed in different housings, the thickness d2 of the power transmission side first housing 110 can be made thinner. . For example, when the wireless power transmission device 1 is provided on the ground as in the above embodiment, the power transmission side first housing 110 housing the power transmission side electrode 10 that needs to be opposed to the power reception side electrode 20 during power feeding can be made thinner. Therefore, the height of the wireless power transmission device 1 protruding from the ground can be suppressed.

Further, in the wireless power transmission device 1 according to the present embodiment, the power transmission side second housing 120 has higher electrical conductivity and thermal conductivity than the power transmission side first housing 110 .

As a result, since the power receiving side coil is housed in a housing with higher electrical and thermal conductivity, it is possible to suppress a decrease in transmission efficiency and deformation of the housing due to heat generated by the power transmitting side coil. Leakage of noise to the outside can be suppressed.

Further, in the wireless power transmission device 1 according to the present embodiment, the power transmission side second housing 120 is formed on the second adjacent plate 121 on the side of the power transmission side first housing 110, and connects the power transmission side electrode 10 and the power transmission side coil L1. An insertion hole 60 through which the transmission line 30 to be connected is inserted is provided, and at least both ends in the axial direction of the insertion hole 60 are curved in the peripheral edge portion of the insertion hole 60 .

As a result, even when the electrical conductivity of the second housing 120 on the power transmission side is high, since both axial ends of the periphery of the insertion hole 60 through which the transmission lines 31 and 32 are inserted are curved, the insertion hole 60 It is possible to suppress the concentration of the electric field generated at both ends of the

Further, in the wireless power transmission device 1 according to the present embodiment, the insertion hole 60 is formed to extend along the transmission line 30, and the length of the insertion hole 60 in the axial direction DX is equal to the surface where the insertion hole 60 is formed. longer than the thickness of

As a result, radiation of noise generated from the transmission line 30 to the outside can be suppressed.

A wireless power transmission system 100 according to the present embodiment includes a wireless power transmission device 1 capable of transmitting power by an electric field coupling method, and a wireless power receiving device 2 capable of receiving power transmitted from the wireless power transmission device 1, The wireless power transmission device 1 includes a power transmission side electrode 10, a power transmission side coil L1 electrically connected to the power transmission side electrode 10, a power transmission side first housing 110 that houses the power transmission side electrode 10, and a power transmission side coil L1. The wireless power receiving device 2 houses the power receiving side electrode 20, the power receiving side coil L2 electrically connected to the power receiving side electrode 20, and the power receiving side electrode 20. A power receiving side first housing 130 and a power receiving side second housing 140 that accommodates the power receiving side coil L2 are provided.

As a result, the power transmission side first housing 110 that houses the power transmission side electrode 10 and the power reception side first housing 130 that houses the power reception side electrode 20 can be made thinner.

Although the embodiment of the present invention has been described above, the present invention is not limited to this.

In the above embodiment, the power transmission side first housing 110 is made of resin, but only the electrode holding plate 111 that holds the power transmission side electrode 10 may be made of resin, and the other surfaces may be made of metal. Similarly, in the first power receiving side housing 130, only the electrode holding plate 131 that holds the power receiving side electrode 20 may be made of resin, and the other surfaces may be made of metal.

In the above embodiment, the power transmitting side second housing 120 and the power receiving side second housing 140 are made of metal, but may be made of non-metal such as resin.

In the above embodiment, the peripheral edge portion 811 of the insertion hole 80 and the peripheral edge portion of the insertion hole 60 are curved at least at both ends in the axial direction DX. Thus, in a cross-sectional view, it may be formed substantially perpendicular to the surface of the second adjacent plate 141 on the side of the internal space 144 .

In the above-described embodiments, the power transmission side first housing 110 and the power transmission side second housing 120 or the power reception side first housing 130 and the power reception side second housing 140 are connected to each other, but they are not connected to each other. good too.

In the above embodiments, the power transmission side first housing 110 and the power transmission side second housing 120 or the power reception side first housing 130 and the power reception side second housing 140 are adjacent to each other, but are not adjacent to each other and are separated from each other. can be placed as

In the above embodiment, the power transmission side coil L1, the power reception side coil L2, the capacitance C _m1 , and the capacitance C _m2 are arranged to form a series resonance circuit, but they may be arranged to form a parallel resonance circuit. .

1 wireless power transmission device 2 wireless power reception device 10 power transmission side electrode 20 power reception side electrode 100 wireless power transmission system 110 power transmission side first housing 120 power transmission side second housing 130 power reception side first housing 140 power reception side second housing L1 Power transmission side coil L2 Power reception side coil

Claims (9)

a power receiving electrode;
a power-receiving-side coil electrically connected to the power-receiving-side electrode;
a power-receiving-side first housing that houses the power-receiving-side electrode;
A wireless power receiving device capable of receiving electric power by an electric field coupling method, comprising: a second power receiving side housing that houses the power receiving side coil. The wireless power receiving device according to claim 1, wherein the second power receiving side housing has higher electrical conductivity and higher thermal conductivity than the first power receiving side housing. the power receiving side second housing includes an insertion hole through which a transmission line connecting the power receiving side electrode and the power receiving side coil is inserted;
3. The wireless power receiving device according to claim 2, wherein at least both axial ends of said insertion hole are formed into a curved surface in the periphery of said insertion hole. the insertion hole is formed to extend along the transmission line,
The wireless power receiving device according to claim 3, wherein the axial length of the through hole is longer than the thickness of the surface on which the through hole is formed. a power transmission side electrode;
a power transmission side coil electrically connected to the power transmission side electrode;
a power transmission side first housing that houses the power transmission side electrode;
A wireless power transmission device capable of transmitting power by an electric field coupling method, comprising: a power transmission side second housing that houses the power transmission side coil. The wireless power transmission device according to claim 5, wherein the second power transmission side housing has higher electrical conductivity and higher thermal conductivity than the first power transmission side housing. The power transmission side second housing includes an insertion hole through which a transmission line connecting the power transmission side electrode and the power transmission side coil is inserted,
7. The wireless power transmitting device according to claim 6, wherein at least both axial ends of said insertion hole are formed into a curved surface in the periphery of said insertion hole. the insertion hole is formed to extend along the transmission line,
The wireless power transmitting device according to claim 7, wherein the axial length of the through hole is longer than the thickness of the surface on which the through hole is formed. a wireless power transmission device capable of transmitting electric power by an electric field coupling method;
a wireless power receiving device capable of receiving power transmitted from the wireless power transmitting device;
The wireless power transmission device
a power transmission side electrode;
a power transmission side coil electrically connected to the power transmission side electrode;
a power transmission side first housing that houses the power transmission side electrode;
a power transmission side second housing that houses the power transmission side coil;
The wireless power receiving device
a power receiving electrode;
a power-receiving-side coil electrically connected to the power-receiving-side electrode;
a power-receiving-side first housing that houses the power-receiving-side electrode;
A wireless power transmission system comprising: a second power receiving side housing that houses the power receiving side coil.

Images