Wireless power transmission system

Abstract

To provide a wireless power transmission system and a wireless power transmission system that can flexibly set an extension direction of a wireless power transmission electrode.SOLUTION: In a wireless power transmission system 100, a wireless power transmission device 2 includes an AC power generator 4, a first electrode 21 electrically connected to a first output terminal 210 of the AC power generator 4, a second electrode 22 electrically connected to a second output terminal 220, a first stretched electrode 24 that is not in contact with the first electrode 21, a second stretched electrode 25 that is not in contact with the second electrode 22, a first relay portion 6a arranged between the first electrode 21 and the first stretched electrode 24, and a second relay portion 6b arranged between the second electrode 22 and the second stretched electrode 25. AC power is transmitted between the first electrode 21 and the first stretched electrode 24 via the first relay portion 6a that resonates with the AC power, and AC power is transmitted between the second electrode 22 and the second stretched electrode 25 via the second relay portion 6b that resonates with the AC power.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a wireless power transmission device, a wireless power reception device, and a wireless power transmission system.

Background Art

[0002] In recent years, with the popularization of mobile phones, electric vehicles, etc., the development of magnetic resonance type and electric field resonance type wireless power transmission systems that supply power wirelessly has been actively carried out. Magnetic resonance type wireless power transmission is a technology that generates magnetic resonance with a coupler composed of a coil on the power transmission side and a coupler composed of a coil on the power reception side to transmit power wirelessly. Electric field resonance type wireless power transmission is a technology that generates resonance by LC (coil and capacitor) with a coupler composed of two electrodes on the power transmission side and two electrodes on the power reception side to transmit power wirelessly.

[0003] And, in an electric field resonance type wireless power transmission system, a method of connecting electrodes in multiple stages to perform long-distance power transmission has been proposed. For example, in Patent Document 1, in a wireless power transmission system, a power transmission device has first and second electrodes, a power reception device has third and fourth electrodes, and a fifth electrode and a sixth electrode are arranged as relay devices between the power transmission device and the power reception device, and the relay device describes a technique for adjusting the input impedance of the power transmission device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technology of Patent Document 1, the direction in which power can be efficiently transmitted is limited to the direction in which the electric fields generated between the electrodes of each of the power transmission coupler, the power reception coupler, and the relay coupler are substantially parallel.

[0006] The present invention aims to provide a wireless power transmission device, a wireless power receiving device, and a wireless power transmission system that allow the extension direction of the wireless power transmission electrode to be flexibly set without being limited to a fixed direction. [Means for solving the problem]

[0007] (1) The wireless power transmission device is a wireless power transmission device that transmits alternating current power to a wireless power receiving device by electric field, and comprises: an alternating current power generation unit having a first output terminal and a second output terminal; a first electrode electrically connected to the first output terminal; a second electrode electrically connected to the second output terminal; a first extension electrode arranged in a path through which alternating current power is transmitted via the first electrode, extending the path through which the alternating current power is transmitted, and not in contact with the first electrode; a second extension electrode arranged in a path through which alternating current power is transmitted via the second electrode, extending the path through which the alternating current power is transmitted, and not in contact with the second electrode; a first relay unit arranged insulated between the first electrode and the first extension electrode; and a second relay unit arranged insulated between the second electrode and the second extension electrode, wherein alternating current power is transmitted between the first electrode and the first extension electrode via the first relay unit which resonates with the alternating current power, and alternating current power is transmitted between the second electrode and the second extension electrode via the second relay unit which resonates with the alternating current power.

[0008] (2) In the wireless power transmission device of (1), if the first extension electrode and the second extension electrode are each composed of multiple units, the first relay unit and the second relay unit are also composed of multiple units, and AC power is transmitted between one first extension electrode and the other first extension electrode via the first relay unit, and AC power is transmitted between one second extension electrode and the other second extension electrode via the second relay unit.

[0009] (3) In the wireless power transmission device of (1) or (2), the first relay unit and the second relay unit each have a pair of relay electrodes and a resonant frequency adjustment unit connected between the pair of relay electrodes, and the pair of relay electrodes are electrically coupled to the first electrode, the first extension electrode, the second electrode and the second extension electrode.

[0010] (4) In the wireless power transmission device of (1) to (3), the first extension electrode and the first relay section are arranged in the first direction of the first electrode, the first extension electrode and the first relay section are arranged in the second direction of the first electrode, the second extension electrode and the second relay section are arranged in the first direction of the second electrode, the second extension electrode and the second relay section are arranged in the second direction of the second electrode, the first direction of the first electrode and the first direction of the second electrode are the same direction, and the second direction of the first electrode and the second direction of the second electrode are the same direction.

[0011] (5) In the wireless power transmission devices of (1) to (4), the first electrode, the first extension electrode and the first relay unit are arranged along the path through which AC power is transmitted, the second electrode, the second extension electrode and the second relay unit are arranged along the path through which AC power is transmitted, and the first electrode and the second electrode, the first extension electrode and the second extension electrode, and the first relay unit and the second relay unit each form a pair and are arranged at the same predetermined interval.

[0012] (6) In the wireless power transmission devices of (1) to (5), the first relay section and the second relay section are formed by printed circuit boards.

[0013] (7) The wireless power receiving device receives power by coupling with the wireless power transmitting devices (1) to (6) by an electric field.

[0014] (8)(7) The wireless power receiving device has a receiving electrode that is coupled with the electrode of the wireless power transmitting device by an electric field.

[0015] (9) The wireless power transmission system comprises (1) to (6) wireless power transmission devices and (7) wireless power receiving device.

[0016] In the wireless power transmission system of (10)(9), the electrodes of the wireless power transmission device are arranged on the surface, the wireless power reception device is arranged on the movable body, and the movable body moves while receiving power from the wireless power transmission device on the surface. In the wireless power transmission device, the first electrode, the first extension electrode, and the first relay part are arranged along the path through which AC power is transmitted, and the second electrode, the second extension electrode, and the second relay part are arranged along the path through which AC power is transmitted. The first electrode and the second electrode, the first extension electrode and the second extension electrode, and the first relay part and the second relay part form pairs and are arranged at the same predetermined interval.

Effect of the Invention

[0017] According to the present invention, it is possible to provide a wireless power transmission system and a wireless power transmission system capable of flexibly setting the extension direction of the wireless transmission electrode.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view of the wireless power transmission system according to the first embodiment of the present invention. [Figure 2] It is a cross-sectional view of the relay part according to the first embodiment of the present invention. [Figure 3] It is a schematic diagram showing the configuration from the AC power generation unit to the load according to the first embodiment of the present invention, exemplifying the case where there is no resonance circuit and the load is far from the AC power generation unit. [Figure 4] It is a schematic diagram of an example including a resonance frequency adjustment circuit in the configuration from the AC power generation unit to the load according to the first embodiment of the present invention. [Figure 5] It is a schematic diagram of an example in the case where the load is close to the AC power generation unit in the configuration from the AC power generation unit to the load according to the first embodiment of the present invention. [Figure 6] It is a schematic diagram showing Modification 1 of the first embodiment of the present invention. [Figure 7] It is a schematic diagram showing Modification 2 of the first embodiment of the present invention. [Figure 8] It is a schematic diagram showing Modification 3 of the first embodiment of the present invention. [Figure 9]It is a cross-sectional view showing an example in which a relay part is formed on the back surface of a power transmission electrode according to a modification 4 of the first embodiment of the present invention. [Figure 10] It is a schematic diagram showing a wireless power transmission system in which a relay part has a relay part electric cable according to the second embodiment of the present invention. [Figure 11] It is a block diagram showing a functional configuration and a hardware configuration of an information processing apparatus according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0019] Hereinafter, a wireless power transmission system 200 according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the same reference numerals are assigned to the same components.

[0020] (First Embodiment) FIG. 1 is a conceptual diagram of an application form of a wireless power transmission system 200 according to an embodiment of the present invention. In the example of FIG. 1, the wireless power transmission system 200 according to the present embodiment is connected to, for example, a rechargeable battery that is a load 5 of the self-propelled device 40, and appropriate charging is performed from the AC power generation unit 4 to the load 5 of the self-propelled device 40 via a rectifier circuit 3b not shown in FIG. 1. Note that the load 5 is not limited to a rechargeable battery and may be a motor or the like.

[0021] The wireless power transmission system 200 is an electric field type wireless power transmission system, and includes a relay unit 6 having a relay electrode 61 which is a pair of electrodes electrically connected to each other, and a plurality of wireless power transmission electrodes 20 that are capacitively coupled to the relay electrode 61 of the relay unit 6 and are coupled in series with each other across the relay unit 6. The wireless power transmission electrode 20 is composed of a first electrode 21 and a second electrode 22.

[0022] In Figure 1, a first electrode 21 and a first extension electrode 24 are provided with a first relay section 6a in between. The first electrode 21 is located closer to the AC power generation unit 4, and the first extension electrode 24 is located further away from the AC power generation unit 4. Furthermore, a second electrode 22 and a second extension electrode 25 are provided with a second relay section 6b in between. The second electrode 22 is located closer to the AC power generation unit 4, and the second extension electrode 25 is located further away from the AC power generation unit 4. Power is transmitted from the AC power generation unit 4 to the first electrode 21 and the second electrode 22 through the first output terminal 210 and the second output terminal 220. AC power is transmitted between the first electrode 21 and the first extension electrode 24 via the first relay section 6a, which resonates with AC power. AC power is transmitted between the second electrode 22 and the second extension electrode 25 via the second relay section 6b, which resonates with AC power.

[0023] Furthermore, the wireless power transmission system 200 includes a wireless power receiving device 3 having a first receiving electrode 31 that is electrically coupled to the first electrode 21 or the first extension electrode 24, and a second receiving electrode 32 that is electrically coupled to the second electrode 22 or the second extension electrode 25. The wireless power receiving device 3 transmits power to the load 5. In the example shown in Figure 1, the first receiving electrode 31 is electrically coupled to the first extension electrode 24, and the second receiving electrode 32 is electrically coupled to the second extension electrode 25. When the first receiving electrode 31 and the second receiving electrode 32 of the wireless power receiving device 3 are located closer to the wireless power transmission device 2 than to the relay unit 6, the equivalent circuit of the wireless power transmission, including the wireless power transmission device 2 composed of the first electrode 21 and the second electrode 22, is the same as the equivalent circuit of a conventional wireless power transmission without the relay unit 6. The transmitting electrode and the receiving electrode are electrically coupled, and a capacitance is formed between them.

[0024] The wireless power transmission system 200 may include an information processing device 1, although this will be described in detail later. The information processing device 1 may consist of, for example, a personal computer (PC) or a tablet terminal, and may control the AC power generation unit 4, relay unit 6, etc., through the communication unit 7. In the example shown in Figure 1, an insulating floor 8 is laid on the structural floor 50 of the building, and the wireless power transmission system 200 is installed on top of it.

[0025] AC power is transmitted between the first electrode 21 and the first extension electrode 24 by the first relay section 6a, and AC power is transmitted between the second electrode 22 and the second extension electrode 25 by the second relay section 6b. The relay section 6 extends the power transmission path. The first electrode 21 and the second electrode 22 may both be formed on the same plane. The first power receiving electrode 31 and the second power receiving electrode 32 may also be formed on the same plane. All wireless power transmitting electrodes 20 may be flat.

[0026] Figure 2 shows a cross-section of the first relay section 6a along the line I-I' in Figure 1. The first relay section 6a includes, for example, an insulating substrate 63, a pair of relay electrodes 61, and a resonant frequency adjustment section 62. The insulating substrate 63 is, for example, a glass epoxy substrate. The relay electrodes 61 are, for example, flat electrodes, and a pair of relay electrodes 61 are connected by the resonant frequency adjustment section 62. The resonant frequency adjustment section 62 includes a capacitor and / or an inductor. Generally, it includes an inductor, and the inductor and capacitor may be arranged in parallel. In a simple configuration, only an inductor is provided in series with the pair of relay electrodes 61.

[0027] The resonant frequency adjustment section 62 can be formed by concentrated elements mounted on an insulating substrate 63 or by a conductor pattern on the insulating substrate 63. For example, the resonant frequency adjustment section 62 may be formed by providing a meander line as a conductor pattern as the inductor. Alternatively, depending on the required element values, a configuration in which a pair of relay electrodes 61 are short-circuited by a single linear conductor pattern, a configuration in which a pair of relay electrodes 61 are integrated into a single flat electrode, or a configuration in which the pair of relay electrodes 61 are capacitively coupled.

[0028] The first electrode 21 on the side closer to the AC power generation unit 4 forms a capacitor by facing one of the relay electrodes 61 via an insulating substrate 63, and the first extension electrode 24 on the side further from the AC power generation unit 4 forms a capacitor by facing the other relay electrode 61 via the insulating substrate 63. The first power receiving electrode 31 faces either the first electrode 21 or the first extension electrode 24 and is electrically coupled. Through this electric field coupling, power from the AC power generation unit 4 is transmitted to the first power receiving electrode 31 and then transmitted to the load 5 via a rectifier circuit 3b (not shown in Figure 2).

[0029] The first power receiving electrode 31 is expected to be applied to the self-propelled device 40 shown in Figure 1, etc. A gap is provided between the first power receiving electrode 31 and the first electrode 21.

[0030] In the relay section 6, as shown in Figure 2, the relay electrode 61 may be placed between the first electrode 21 and the first power receiving electrode 31. The first electrode 21 and the first extension electrode 24 are placed on a flat insulating floor 8, and insulating substrates 63 on which the resonant frequency adjustment section 62 and the relay electrode 61 are formed are placed sequentially. The components are stacked sequentially on top of each other, making construction easy. In the relay section 6, the insulating substrate 63 is, for example, a printed circuit board, and functions as a dielectric layer when forming a capacitor between the relay electrode 61 and the first electrode 21, or between the relay electrode 61 and the first extension electrode 24, and also functions as a substrate for forming the resonant frequency adjustment section 62.

[0031] The second relay section 6b has the same configuration as the first relay section 6a, and the relationship between the second relay section 6b and the second electrode 22, and the relationship between the second relay section 6b and the second extension electrode 25 are the same as the relationship between the first relay section 6a and the first electrode 21, and the relationship between the first relay section 6a and the first extension electrode 24. The relay electrode 61 may be placed between the second electrode 22 or the second extension electrode 25 and the second power receiving electrode 32. The surface of the insulating floor 8 is flat, making construction easy. In the relay section 6, the insulating substrate 63 functions as a dielectric layer when a capacitor is formed between the relay electrode 61 and the second electrode 22 or the second extension electrode 25, and also functions as a substrate for forming the resonant frequency adjustment section 62.

[0032] The relay unit 6 may be formed by an insulating substrate 63, a relay electrode 61, and a resonant frequency adjustment unit 62. Alternatively, the size of the first extended electrode 24 and the second extended electrode 25, for example, the width and length, may be standardized and unitized. By connecting multiple units of the first extended electrode 24 and the second extended electrode 25 and the units of the relay unit 6 alternately in a continuous sequence, the distance that the self-propelled device 40 can travel can be extended, and power transmission over a wide range can be achieved.

[0033] The resonant frequency adjustment unit 62 provided in the relay unit 6 is, for example, formed between a pair of relay electrodes 61, and its length can be changed.

[0034] The insulating substrate 63 can also be replaced with air as a dielectric layer. In this case, the gap between the intermediate electrode 61 and the first electrode 21 or the first extended electrode 24 can be held by an insulator, such as a columnar insulator. The pair of intermediate electrodes 61 may be connected, for example, via an inductor acting as a resonant frequency adjustment unit 62.

[0035] Figure 3 shows a wireless power transmission system 200 according to one embodiment of the present invention, in which power is transmitted to the load 5 via a rectifier circuit 3b, and no resonant circuit is provided on either the transmitting side where the AC power generation unit 4 is located or the receiving side where the load 5 is located. As shown in Figure 3, the first relay unit 6a has a relay electrode 61a, a resonant frequency adjustment unit 62a, and an insulating substrate 63a. In Figures 4 to 6, some notations have been omitted as appropriate, but the basic configuration is the same as in Figure 3.

[0036] Figure 4 shows an example configuration of a wireless power transmission system 200 according to one embodiment of the present invention, in which resonant circuits are provided on both the transmitting side, which has an AC power generation unit 4, and the receiving side, which has a rectifier circuit 3b and a load 5, to realize electric field resonance power transmission. In the example of Figure 4, a transmission resonance frequency adjustment circuit 23a is connected between the AC power generation unit 4 on the transmitting side and the first electrode 21, a transmission resonance frequency adjustment circuit 23b is connected between the AC power generation unit 4 on the transmitting side and the second electrode 22, a receiving resonance frequency adjustment circuit 33a is connected between the load 5 on the receiving side and the first receiving electrode 31, and a receiving resonance frequency adjustment circuit 33b is connected between the load 5 on the receiving side and the second receiving electrode 32. In terms of transmission distance, the electric field resonance type shown in Figure 4 is advantageous, while the configuration shown in Figure 3 has the advantage of simplifying the system configuration.

[0037] As shown in Figure 5, the position of the receiving electrode 30, which is connected to the load 5 via the rectifier circuit 3b, can be positioned opposite the wireless power transmission electrode 20 at any position. However, depending on whether the receiving electrode 30 faces the first electrode 21 and second electrode 22 on the side closer to the AC power generation unit 4, as shown in Figure 5, or faces the first extension electrode 24 and second extension electrode 25 on the side further from the AC power generation unit 4, as shown in Figure 3, the number of relay units 6, i.e., the number of capacitors and inductors, that are interposed before reaching the load 5 will differ. Taking this into consideration, the resonant frequency adjustment unit 62 shown in Figure 2, and the power transmission resonant frequency adjustment circuit 23 and power receiving resonant frequency adjustment circuit 33 shown in Figure 4 may be adjusted.

[0038] (Variation 1) In the above, an example was described in which one first extension electrode 24 and one second extension electrode 25 are arranged by electric field coupling. Figure 6 shows a modified example 1 in which two first extension electrodes 24 and two second extension electrodes 25 are arranged by electric field coupling. The first extension electrode 24 and the second extension electrode 25 can be arranged continuously via the relay section 6 of this embodiment, and by arranging the necessary number according to the application, the distance that the self-propelled device 40 can travel can be extended.

[0039] (Modification 2) In the above, an example was described in which the first extended electrode 24 and the second extended electrode 25 are extended parallel to each other in the same direction. A modified example 2 will be described with reference to Figure 7. In the wireless power transmission device 2, the first extended electrode 24a and the first relay section 6a are arranged in the first direction of the first electrode 21, i.e., to the right in Figure 7. On the other hand, the first extended electrode 24c and the first relay section 6e are arranged in the second direction of the first electrode 21, i.e., to the left in Figure 7. Furthermore, the second extended electrode 25a and the second relay section 6b are arranged in the first direction of the second electrode 22, i.e., to the right in Figure 7. In addition, the second extended electrode 25c and the second relay section 6f are arranged in the second direction of the second electrode 22, i.e., to the left in Figure 7. The first direction of the first electrode 21 and the first direction of the second electrode 22 are the same direction, and the second direction of the first electrode 21 and the second direction of the second electrode 22 are the same direction.

[0040] In Figure 7, the first and second directions are opposite to each other, but are not limited to this; the first and second directions may be orthogonal, or they may form any angle, for example, 30 degrees. In Figure 7, similar to the modified example 1 shown in Figure 6, a first stretched electrode 24b is provided in relation to the first stretched electrode 24a, and similarly, a second stretched electrode 25b is provided in relation to the second stretched electrode 25a.

[0041] (Variation 3) In the above, an example was described in which the first extended electrode 24 and the second extended electrode 25 are extended parallel to each other in the same direction. In particular, the relationship between the first electrode 21 and the first extended electrode 24a, etc., will be explained with reference to Figure 8. The first electrode 21, the first extended electrode 24a, and the first relay section 6a are arranged along the path through which AC power is transmitted from the AC power generation unit 4. The second electrode 22, the second extended electrode 25a, and the second relay section 6b are arranged along the path through which AC power is transmitted from the AC power generation unit 4. The first electrode 21 and the second electrode 22, the first extended electrode 24a and the second extended electrode 25a, and the first relay section 6a and the second relay section 6b each form a pair and are arranged at the same predetermined interval d1. With this configuration, when the first power receiving electrode 31 and the second power receiving electrode 32 are arranged on a movable body, AC power can be received without changing the distance between the first power receiving electrode 31 and the second power receiving electrode 32, and they can move smoothly on the first extension electrode 24 and the second extension electrode 25. Furthermore, it is preferable that multiple first extension electrodes 24 and second extension electrodes 25 are provided via the relay unit 6, similar to the embodiment shown in Figure 6.

[0042] (Modification 4) In the embodiments described so far, a ground electrode is not formed near the wireless power transmission electrode 20, but a ground electrode may be formed near or behind the wireless power transmission electrode 20. In this case, the resonance condition can be adjusted by varying the distance between the wireless power transmission electrode 20 and the ground electrode. If the first electrode 21 and the second electrode 22 are arranged in close proximity, the capacitance formed between the two wireless power transmission electrodes can be used to adjust the resonance condition.

[0043] (Variation 5) Next, the configuration of the relay section 6 according to Modification 4 of this embodiment will be described. Figure 9 shows a cross-sectional view of the relay section 6 according to Modification 4, taken along the line I-I' in Figure 1. In the relay section 6 of this example, as shown in Figure 9, the relay electrode 61 may be placed on the back of the first electrode 21, in other words, on the opposite side of the first power receiving electrode 31, with the first electrode 21 in between. In this case, the surface of the first electrode 21 becomes flat, and the movement of the first power receiving electrode 31 becomes easier. In addition, the insulating substrate 63 functions as a dielectric layer when a capacitor is formed between the relay electrode 61 and the first electrode 21 or the first extended electrode 24, and also functions as a substrate for forming the resonant frequency adjustment section 62.

[0044] The relationship between the relay section 6 and the second electrode 22 or the second extended electrode 25 is the same as the relationship between the relay section 6 and the first electrode 21 or the first extended electrode 24. The relay electrode 61 may be placed on the back side of the second electrode 22, in other words, on the opposite side of the first power receiving electrode 31 with the second electrode 22 in between. The surface of the second electrode 22 becomes flat, making it easier to move the second power receiving electrode 32. In addition, the insulating substrate 63 functions as a dielectric layer when a capacitor is formed between the relay electrode 61 and the second electrode 22 or the second extended electrode 25, and also functions as a substrate for forming the resonant frequency adjustment section 62.

[0045] (Second Embodiment) In the first embodiment, the relay unit 6 had a configuration having a relay electrode 61 and a resonant frequency adjustment unit 62 on an insulating substrate 63. In the second embodiment, as shown in Figure 10, the relay unit 6 further has a relay unit electrical cable 64. The relay unit electrical cable 64 connects the pair of relay electrodes 61. As shown in Figure 10, the resonant frequency adjustment unit 62 may be provided in the middle of the relay unit electrical cable 64. Alternatively, the resonant frequency adjustment unit 62 may be mounted on the insulating substrate 63 which is joined to the relay electrodes 61. With this configuration, the relative positional relationship of the first electrode 21, the second electrode 22, the first power receiving electrode 31, and the second power receiving electrode 32 can be flexibly changed via the relay unit electrical cable 64, further improving the degree of freedom in the arrangement of the wireless power transmission system 200.

[0046] (Information processing device) Next, the configuration for adjusting the AC power generation unit 4, the power transmission resonant frequency adjustment circuit 23, the power reception resonant frequency adjustment circuit 33, the resonant frequency adjustment unit 62, etc., in the above-described embodiment will be explained. Here, the above control is assumed to be performed by the information processing device 1. However, it is also possible to adjust manually without using the information processing device 1.

[0047] The information processing device 1, as shown in Figure 11, for example, has a functional configuration consisting of a power transmission / reception information acquisition unit 101, a power transmission control unit 102, and a resonant frequency control unit 103, and a hardware configuration consisting of an input / output unit 104, a communication means 105, and a storage unit 106. The functional configuration of the information processing device 1 can be realized, for example, by executing a software program using a processor such as a CPU provided in the information processing device 1, but it may also be configured as hardware logic. The input / output unit 104 has input / output devices such as a display that outputs the power transmission / reception status and a keyboard for inputting setting information. The information processing device 1 sends commands to each resonant frequency adjustment circuit through the communication means 105. The storage unit 106 stores control programs, control parameters, etc.

[0048] The power transmission and reception information acquisition unit 101 acquires information such as the location of the object having a load 5 to receive power, for example the self-propelled device 40 shown in Figure 1, the power consumption of the load 5, the amount of charge, and other information related to the need for power reception, the impedance of the load 5, the number of relay units 6 between the load 5 and the AC power generation unit 4, and the length and resistance of the wireless power transmission electrode 20. The power transmission control unit 102 controls the output from the AC power generation unit 4. Based on the information acquired by the power transmission and reception information acquisition unit 101, the resonant frequency control unit 103 controls the power transmission resonant frequency adjustment circuit 23, the power reception resonant frequency adjustment circuit 33, and the resonant frequency adjustment unit 62, for example, from the communication means 105 based on the communication unit 7 shown in Figure 1, in order to maximize the power transmission efficiency to the load 5.

[0049] This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of the disclosure are considered to be within the scope of the present invention.

[0050] The following effects can be achieved by the wireless power transmission system 100 and wireless power transmission system 200 according to the embodiments described above. (1) The wireless power transmission device 2 is a wireless power transmission device 2 that transmits AC power to the wireless power receiving device 3 by electric field, and comprises an AC power generation unit 4 having a first output terminal 210 and a second output terminal 220, a first electrode 21 electrically connected to the first output terminal 210, a second electrode 22 electrically connected to the second output terminal 220, a first extension electrode 24 arranged in the path through which AC power is transmitted via the first electrode 21, extending the path through which AC power is transmitted and not in contact with the first electrode 21, and the second electrode 22 The device comprises a second extension electrode 25 positioned in the path through which AC power is transmitted, extending the path through which AC power is transmitted and being in non-contact with the second electrode 22; a first relay section 6a positioned insulated between the first electrode 21 and the first extension electrode 24; and a second relay section 6b positioned insulated between the second electrode 22 and the second extension electrode 25. AC power is transmitted between the first electrode 21 and the first extension electrode 24 via the first relay section 6a, which resonates with AC power, and AC power is transmitted between the second electrode 22 and the second extension electrode 25 via the second relay section 6b, which resonates with AC power.

[0051] This makes it possible to provide a wireless power transmission system 100 in which the extension direction can be arbitrarily determined.

[0052] (2) In the wireless power transmission device 2 of (1), if the first extension electrode 24 and the second extension electrode 25 are each composed of multiple units, the first relay unit 6a and the second relay unit 6b are also composed of multiple units, and AC power is transmitted between one first extension electrode 24 and the other first extension electrode 24 via the first relay unit 6a, and AC power is transmitted between one second extension electrode 25 and the other second extension electrode 25 via the second relay unit 6b.

[0053] This makes it possible to provide a wireless power transmission system 100 in which the transmission distance or extension distance can be arbitrarily determined.

[0054] (3) In the wireless power transmission device 2 of (1) or (2), the first relay unit 6a and the second relay unit 6b each have a pair of relay electrodes 61 and a resonant frequency adjustment unit 62 connected between the pair of relay electrodes 61, and the pair of relay electrodes 61 are electrically coupled to the first electrode 21, the first extension electrode 24, the second electrode 22 and the second extension electrode 25.

[0055] This allows the propagating AC at the relay unit 6 and the power output AC to resonate with each other, enabling longer power transmission distances.

[0056] (4) In the wireless power transmission device 2 of (1) to (3), the first extension electrode 24 and the first relay section 6a are arranged in the first direction of the first electrode 21, the first extension electrode 24 and the first relay section 6a are arranged in the second direction of the first electrode 21, the second extension electrode 25 and the second relay section 6b are arranged in the first direction of the second electrode 22, the second extension electrode 25 and the second relay section 6b are arranged in the second direction of the second electrode 22, the first direction of the first electrode 21 and the first direction of the second electrode 22 are the same direction, and the second direction of the first electrode 21 and the second direction of the second electrode 22 are the same direction.

[0057] This makes it possible to provide a wireless power transmission system 100 that can transmit power simultaneously in multiple different directions.

[0058] (5) In the wireless power transmission device 2 of (1) to (4), the first electrode 21, the first extension electrode 24 and the first relay unit 6a are arranged along the path through which AC power is transmitted, the second electrode 22, the second extension electrode 25 and the second relay unit 6b are arranged along the path through which AC power is transmitted, and the first electrode 21 and the second electrode 22, the first extension electrode 24 and the second extension electrode 25, and the first relay unit 6a and the second relay unit 6b each form a pair and are arranged at the same predetermined interval d1.

[0059] This makes it possible to provide a wireless power transmission system 100 that can transmit power stably.

[0060] (6) In the wireless power transmission device 2 of (1) to (5), the first relay unit 6a and the second relay unit 6b are formed by printed circuit boards.

[0061] This makes it possible to provide a wireless power transmission system 100 that easily incorporates electrical circuits such as insulating layers, capacitors, and inductors.

[0062] (7) The wireless power receiving device 3 receives power by coupling with the wireless power transmitting devices 2 (1) to (6) by an electric field.

[0063] This enables a configuration using flat electrodes, providing a high degree of freedom in power transmission.

[0064] The wireless power receiving device 3 of (8)(7) has a receiving electrode 30 that is coupled with the electrode of the wireless power transmitting device 2 by an electric field.

[0065] This enables a configuration using flat plates, resulting in a simple wireless power receiving device 3.

[0066] (9) The wireless power transmission system 200 comprises the wireless power transmission devices 2 (1) to (6) and the wireless power receiving device 3 (7).

[0067] This enables the realization of a wireless power transmission system 200 with a relatively simple configuration, comprising flat plate electrodes.

[0068] In the wireless power transmission system 200 of (10)(9), the electrodes of the wireless power transmission device 2 are arranged on a surface, the wireless power receiving device 3 is arranged on a movable body, the movable body moves on the surface while receiving power from the wireless power transmission device 2, in the wireless power transmission device 2, the first electrode 21, the first extension electrode 24 and the first relay unit 6a are arranged along the path through which AC power is transmitted, the second electrode 22, the second extension electrode 25 and the second relay unit 6b are arranged along the path through which AC power is transmitted, the first electrode 21 and the second electrode 22, the first extension electrode 24 and the second extension electrode 25, and the first relay unit 6a and the second relay unit 6b each form a pair and are arranged at the same predetermined interval d1.

[0069] This enables a relatively simple, symmetrical layout for wireless power transmission. As a result, the design flexibility of the wireless power transmission system 200 is increased. [Explanation of Symbols]

[0070] 1. Information Processing Device 2. Wireless power transmission device 3. Wireless power receiving device 3b Rectifier circuit 4. AC power generation unit 5 load 6. Relay section 6a First relay section 6b Second relay section 7 Communications Department 8. Insulated floor 20 Wireless power transmission electrodes 21 1st electrode 22 2nd electrode 23 Power transmission resonance frequency adjustment circuit 24 1st stretched electrode 25 Second stretched electrode 30 Power receiving electrode 31. First receiving electrode 32. Second receiving electrode 33. Receiving Resonance Frequency Adjustment Circuit 40 Self-propelled device 50 Structural Floors 61 Relay electrodes 62 Resonant frequency adjustment section 63 Insulating substrate 64. Intermediate section electrical cable 100 Wireless Power Transmission Systems 101 Power transmission and reception information acquisition unit 102 Power transmission control unit 103 Resonant frequency control unit 104 Input / output section 105 Communication methods 106 Storage section 200 Wireless Power Transmission Systems 210 First Output Terminal 220 Second output terminal

Claims

1. A wireless power transmission system comprising a wireless power transmission device and a wireless power receiving device that receives AC power from the wireless power transmission device due to an electric field, A control information processing device for the output of the wireless power transmission system, The system includes a communication unit that communicates between the wireless power transmission system and the information processing device. A wireless power transmission system, The aforementioned wireless power transmission device is AC power generation unit having a first output terminal and a second output terminal, A first electrode electrically connected to the first output terminal, A second electrode electrically connected to the second output terminal, A first extended electrode is positioned in the path through which the AC power is transmitted via the first electrode, extends the path through which the AC power is transmitted, and is not in contact with the first electrode. A second extension electrode is positioned in the path through which the AC power is transmitted via the second electrode, extends the path through which the AC power is transmitted, and is not in contact with the second electrode. A first relay portion is disposed insulated between the first electrode and the first extension electrode, A second relay portion is disposed insulated between the second electrode and the second extension electrode, Equipped with, Between the first electrode and the first extended electrode, the AC power is transmitted via a first relay unit that resonates with the AC power. Between the second electrode and the second extension electrode, the AC power is transmitted via the second relay unit which resonates with the AC power. The first relay unit and the second relay unit each have a pair of relay electrodes and a resonant frequency adjustment unit connected between the pair of relay electrodes. The pair of relay electrodes are electrically coupled to the first electrode, the first extended electrode, the second electrode, and the second extended electrode. The information processing device sends a command through the communication unit to adjust the resonant frequency in the resonant frequency adjustment unit of the wireless power transmission device. A wireless power transmission system characterized by the following features.

2. When the first extension electrode and the second extension electrode are each composed of multiple units, the first relay unit and the second relay unit are also composed of multiple units. The AC power is transmitted between one of the first extended electrodes and the other first extended electrode via the first relay section. The AC power is transmitted between one of the second extended electrodes and the other second extended electrode via the second relay section. The wireless power transmission system according to feature 1.

3. The first extended electrode and the first relay portion are arranged in a first direction of the first electrode, and the first extended electrode and the first relay portion are arranged in a second direction of the first electrode. The second extension electrode and the second relay portion are arranged in the first direction of the second electrode, and the second extension electrode and the second relay portion are arranged in the second direction of the second electrode, The first direction of the first electrode and the first direction of the second electrode are the same direction, and the second direction of the first electrode and the second direction of the second electrode are the same direction. The wireless power transmission system according to claim 2.

4. The first electrode, the first extension electrode, and the first relay section are arranged along the path through which the AC power is transmitted. The second electrode, the second extension electrode, and the second relay section are arranged along the path through which the AC power is transmitted. The first electrode and the second electrode, the first extended electrode and the second extended electrode, and the first relay section and the second relay section each form a pair and are arranged at the same predetermined interval. The wireless power transmission system according to feature 1.

5. The first relay section and the second relay section are formed by a printed circuit board. The wireless power transmission system according to feature 1.

6. The wireless power receiving device, The wireless power transmission device has an electrode that is coupled to a receiving electrode by an electric field. The wireless power transmission system according to feature 1.

7. The electrodes of the wireless power transmission device are arranged on a surface, The wireless power receiving device is arranged on the movable body. The movable body moves on the surface while receiving power from the wireless power transmission device. In the aforementioned wireless power transmission device, The first electrode, the first extension electrode, and the first relay section are arranged along the path through which the AC power is transmitted. The second electrode, the second extension electrode, and the second relay section are arranged along the path through which the AC power is transmitted. The first electrode and the second electrode, the first extended electrode and the second extended electrode, and the first relay section and the second relay section each form a pair and are arranged at the same predetermined interval. The wireless power transmission system according to feature 1.

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