JP6294717B2 - Electric field resonance type wireless power transmission device - Google Patents

Description

  The present invention relates to an electric field resonance type wireless power transmission device that wirelessly transmits electric power by electric field resonance, and more particularly to an electric field resonance type wireless power transmission device that can extend a transmission distance for wireless power transmission.

  The development of technology for wireless power transmission by electromagnetic induction or electromagnetic resonance has been underway. As a technique for performing power transmission by an electromagnetic resonance method, a technique for performing power transmission by using magnetic field coupling between coils is widely known. On the other hand, as a technique for performing power transmission or signal transmission using electric field coupling between electrodes, for example, there is one disclosed in Patent Document 1. The transmission distance of the transmission / reception coupler in Patent Document 1 is about the maximum dimension of the coupler. For example, in the rectangular coupler described in Patent Document 1, the distance of the coupler electrode is 250 mm × 250 mm, and the transmission distance that can ensure good characteristics is about 200 mm. If the transmission distance is longer than this, the transmission efficiency is lowered, and it becomes difficult to send desired power.

  In order to extend the power transmission distance, there is a method using the repeater described in Patent Document 1, but the structure of the repeater is basically the same as that of the power transmission / reception coupler, and the loss caused by the resistance value of the inductor. Will increase with the addition of repeaters. In other words, the addition of a repeater has the disadvantage that the transmission distance is increased but the transmission efficiency is lowered.

  An example of extending the transmission distance is disclosed in Patent Document 2. Patent Document 2 describes a technique in which a minute dipole is formed by a charge on a coupling electrode and a mirror image charge of the ground, and an electromagnetic field generated by the minute dipole is propagated to another coupling electrode disposed at an opposing position. Has been. Here, in order to extend the distance between the two coupling electrodes, a transmission line made of a dielectric or magnetic material is disposed between them. The transmission line is arranged in a direction where the angle formed with the minute dipole is approximately 0 °, and is configured such that a high-frequency electric field propagates as a wave.

JP2013-554363 Japanese Patent No. 5267633

  However, the technique disclosed in Patent Document 2 cannot be applied to a power supply apparatus that wirelessly transmits power to a device such as a rotating body that rotates around an axis, which will be described later. In order to supply electric power to the rotator, it is necessary to make the transmission line coincide with the rotation axis of the rotator, that is, to make the transmission line and the rotation axis common. It is necessary to penetrate the transmission line through the coupling electrode and the ground. However, if the transmission line is passed through the coupling electrode and the ground, the coupling between the coupling electrode and the ground becomes stronger than the coupling between the transmission / reception coupling electrodes, resulting in difficulty in extending the transmission distance. Problems arise. In addition, when considering application to a work lift, which will be described later, since there is a transmission line between the coupling electrodes, the power transmission distance is almost fixed, making it difficult to achieve both extension of the transmission distance and securing the movable range. Problem arises.

  The present invention has been made to solve these problems, and is capable of wirelessly transmitting electric power by electric field resonance to a rotating body and a non-rotating body, and capable of extending the transmission distance. An object is to provide a transmission apparatus.

According to a first aspect of the electric field resonance type wireless power transmission device of the present invention, a power transmission coupler and a power reception coupler each having two electrodes and an inductor connected in series to the two electrodes are provided with a predetermined separation distance. A metal body disposed close to the power transmission coupler and the power receiving coupler, and the two electrodes are a central electrode disposed at the center and an outer peripheral electrode disposed separately from the outer periphery of the central electrode The conductor is a metal column formed in a columnar shape, and a circular through-hole is formed at the center of the center electrode of each of the power transmission coupler and the power reception coupler so that the metal column is not It is characterized by being penetrated by contact .

  Another aspect of the electric field resonance type wireless power transmission device of the present invention further includes a metal wall disposed with a predetermined separation distance between the outer peripheral electrodes of the power transmission coupler and the power reception coupler, The diameter is 1.2 times or less of the diameter of the outer peripheral electrode.

  According to another aspect of the electric field resonance type wireless power transmission device of the present invention, a short plate is provided at each of the end portion on the power transmission coupler side and the end portion on the power reception coupler side of the metal wall, and both end portions of the metal support column are provided. Are connected, and the distance between the power transmission coupler and the short plate adjacent to the power transmission coupler and the distance between the power reception coupler and the short plate adjacent to each other are 1/6 or more of the distance between the power transmission coupler and the power reception coupler, respectively. It is characterized by that.

  In another aspect of the electric field resonance type wireless power transmission device of the present invention, the metal strut and / or the metal wall is cut to be separated into the power transmission coupler side and the power receiving coupler side, and at both ends of the cut ends. An electrode for capacitive coupling is provided.

  In another aspect of the electric field resonance type wireless power transmission device of the present invention, the metal column and the metal wall are curved so that the power transmission coupler and the power reception coupler are arranged at a predetermined angle. And

  Another aspect of the electric field resonance type wireless power transmission device according to the present invention is characterized in that a radial notch is formed in the center electrode and the outer peripheral electrode of the power transmission coupler and / or the power receiving coupler. To do.

According to another aspect of the electric field resonance wireless power transmission device of the present invention, a power transmission coupler and a power reception coupler each having two electrodes and an inductor connected in series to the two electrodes are provided with a predetermined separation distance. A power transmission coupler and a conductor disposed close to the power reception coupler, wherein the two electrodes are formed in a rectangular shape and arranged in parallel, and the conductors are the power transmission coupler and the power reception coupler. metal plates der disposed with a predetermined distance to one or both of the opposite sides to the opposite sides of each of the two electrodes of is, the metal plate, one electrode of the power transmitting coupler These electrodes are arranged along the facing direction so as to be electrically coupled to one electrode of the power receiving coupler .

In another aspect of the electric field resonance type wireless power transmission device of the present invention, a distance between the power transmission coupler and the power reception coupler and the metal plate is 0.1 times or less of a width of the power transmission coupler and the power reception coupler. It is characterized by.

Another aspect of the electric field resonance type wireless power transmission device according to the present invention is a relay coupler having the two electrodes and the inductor having the same shape as the power transmission coupler and the power reception coupler between the power transmission coupler and the power reception coupler. Is arranged.

  According to the present invention, it is possible to provide an electric field resonance type wireless power transmission device capable of wirelessly transmitting electric power by electric field resonance to a rotating body and a non-rotating body and extending a transmission distance. It is possible to realize an application having coupler installation conditions.

It is a perspective view which shows the structure of the electric field resonance type | mold wireless electric power transmission apparatus of 1st Embodiment of this invention. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of the comparative example 1. FIG. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 1st Embodiment. 10 is a graph showing the transmission efficiency of the electric field resonance type wireless power transmission device of Comparative Example 1; 6 is a schematic diagram illustrating an electric field distribution in the electric field resonance type wireless power transmission device of Comparative Example 1. FIG. It is a schematic diagram explaining the electric field distribution in the electric field resonance type | mold wireless electric power transmission apparatus of 1st Embodiment. It is an electric field distribution map in the electric field resonance type wireless power transmission device of a 1st embodiment. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 2nd Embodiment of this invention. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 2nd Embodiment. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 3rd Embodiment. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 3rd Embodiment. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 4th Embodiment. 10 is a cross-sectional view illustrating a configuration of an electric field resonance type wireless power transmission device of Comparative Example 2. FIG. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 4th Embodiment. 10 is a graph showing the transmission efficiency of the electric field resonance type wireless power transmission device of Comparative Example 2. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 5th Embodiment. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 5th Embodiment. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 6th Embodiment. 10 is a perspective view showing a configuration of an electric field resonance type wireless power transmission device of Comparative Example 3. FIG. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 6th Embodiment. 10 is a graph showing the transmission efficiency of the electric field resonance type wireless power transmission device of Comparative Example 3. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 7th Embodiment. It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of the comparative example 4. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 7th Embodiment. 10 is a graph showing the transmission efficiency of the electric field resonance type wireless power transmission device of Comparative Example 4; It is a perspective view which shows the structure of the electric field resonance type | mold wireless power transmission apparatus of 8th Embodiment. It is a graph which shows the transmission efficiency of the electric field resonance type | mold wireless electric power transmission apparatus of 8th Embodiment. It is a schematic diagram which shows an example which applied the electric field resonance type | mold wireless power transmission apparatus of 8th Embodiment to the robot for work. It is a schematic diagram which shows an example which applied the coupler to the work lift in the electric field resonance type | mold wireless electric power transmission apparatus of 8th Embodiment as a rectangular shape.

  An electric field resonance type wireless power transmission device according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description. Further, the input impedances of the AC power supply and the load are all 50Ω unless otherwise noted.

(First embodiment)
An electric field resonance type wireless power transmission apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a configuration of an electric field resonance type wireless power transmission device 100 of the present embodiment. The electric field resonance type wireless power transmission device 100 includes a power transmission coupler 110 that supplies power and a power reception coupler 120 that receives power from the power transmission coupler 110.

  The power transmission coupler 110 includes two electrodes, a disc-shaped center electrode 111 and an outer peripheral electrode 112 formed in an annular shape around the center electrode 111. The center electrode 111 and the outer peripheral electrode 112 are formed in concentric circles whose centers coincide with each other. Similarly, the power receiving coupler 120 also includes a disk-shaped center electrode 121 and an outer peripheral electrode 122 formed in an annular shape around the center electrode 121, and is formed in a concentric shape in which the respective centers coincide with each other.

  In the power transmission coupler 110, one end of each of the inductors 113 and 114 is connected to the center electrode 111 and the outer peripheral electrode 112, and the other end of the inductors 113 and 114 is connected to an AC power source (not shown). Yes. Between the center electrode 111 and the outer peripheral electrode 112 is a capacitive coupling electrode, and a series resonance circuit is formed by the inductors 113 and 114, the central electrode 111, the outer peripheral electrode 112, and an AC power source, and AC power is supplied to the inductors 113 and 114. When supplied, electric field coupling (capacitive coupling) occurs between the center electrode 111 and the outer peripheral electrode 112. The resonant frequency and resonant wavelength of the above series resonant circuit are hereinafter referred to as fc and λc. The diameter of the outer periphery of the outer peripheral electrode 112 is made shorter than λc / (2π), and the center electrode 111 and the outer peripheral electrode 112 are arranged in a region narrower than the diameter λc / (2π). Thereby, the unnecessary radiation from the power transmission coupler can be suppressed.

  Similarly, in power receiving coupler 120, one end of inductors 123 and 124 is connected to center electrode 121 and outer peripheral electrode 122, respectively, and the other end of inductors 123 and 124 is connected to a load (not shown). ing. A series resonance circuit is formed by the inductors 123 and 124, the center electrode 121, the outer peripheral electrode 122, and the load. Similar to the power transmission coupler 110, the diameter of the outer periphery of the outer peripheral electrode 122 is made shorter than λc / (2π), and the center electrode 121 and the outer peripheral electrode 122 are arranged in a region narrower than the diameter λc / (2π). Thereby, unnecessary radiation from the power receiving coupler can be suppressed.

  The electric power coupling (capacitive coupling) between the power transmission coupler 110 and the power receiving coupler 120 can be achieved by disposing the power transmission coupler 110 and the power receiving coupler 120 configured as described above so as to face each other with a predetermined interval therebetween. it can. As a result, the power supplied from the AC power supply to the power transmission coupler 110 can be wirelessly transmitted to the power receiving coupler 120 by electric field coupling, and the power can be supplied to the load connected to the power receiving coupler 120. In addition, since the central electrode 111 and the outer peripheral electrode 112 of the power transmission coupler 110 and the central electrode 121 and the outer peripheral electrode 122 of the power receiving coupler 120 are formed concentrically and have axial symmetry, the central axes coincide with each other. Thus, for example, even when the power receiving coupler 120 is rotated around the central axis, the characteristics do not change, and power transmission can be performed with the same efficiency. In addition, by suppressing the distance between the centers of the power transmission coupler 110 and the power reception coupler 120 to be equal to or less than λc / (2π), the transmission / reception coupler becomes a form of near field coupling, and unnecessary radiation caused by the transmission / reception coupling can be suppressed.

  In the electric field resonance type wireless power transmission device 100 of this embodiment, the radius of the center electrodes 111 and 121 is 70 mm, the radius of the inner periphery of the outer peripheral electrodes 112 and 122 is 225 mm, and the radius of the outer periphery is 240 mm. Accordingly, the width of the outer peripheral electrodes 112 and 122 is 15 mm, and the distance between the outer periphery of the center electrode 111 and the inner periphery of the outer peripheral electrode 112 and the distance between the outer periphery of the center electrode 121 and the inner periphery of the outer peripheral electrode 122 are Both are 155 mm. For example, copper having high electrical conductivity can be used as a material for forming the center electrodes 111 and 121 and the outer peripheral electrodes 112 and 122.

  The inductors 113 and 114 are each formed by using a copper wire having a wire diameter of 1 mm so that the number of turns is 13, the length is 13.4 mm, and the diameter is 21 mm, and the resistance value is 0.5Ω per piece. The inductors 113 and 114 are arranged so that the distance between them is 22.5 mm. The inductors 123 and 124 are formed in the same manner as the inductors 113 and 114.

  The electric field resonance type wireless power transmission device 100 of the present embodiment includes a metal support 130 having a radius of 10 mm in addition to the above-described configuration, and further, through each of the center electrodes 111 and 121, a through-hole 111 a having a radius of 20 mm, 121a is formed. The metal column 130 is disposed so as to penetrate the centers of the through holes 111a and 121a, and has a gap of 10 mm from the inner periphery of the through holes 111a and 121a. Copper can also be used as a material for forming the metal support 130.

  By passing the metal column 130 through the centers of the through holes 111a and 121a as described above, it is possible to extend the distance between the couplers that can wirelessly transmit power from the power transmission coupler 110 to the power reception coupler 120. In the electric field resonance type wireless power transmission device 100 of the present embodiment, the distance between the power transmission coupler 110 and the power reception coupler 120 can be set to, for example, 450 mm.

  On the other hand, the electric field resonance type wireless power transmission device 90 of Comparative Example 1 of the conventional configuration shown in FIG. 2 that does not use the metal support 130 performs power transmission with the same high efficiency as the electric field resonance type wireless power transmission device 100. Therefore, the interval between the power transmission coupler 110 and the power reception coupler 120 needs to be set to 200 mm, for example. In Comparative Example 1 shown in FIG. 2, the center electrodes 111 and 121 of Comparative Example 1 also have through holes 111a in order to have the same configuration as that of the electric field resonance wireless power transmission apparatus 100 except for the presence or absence of the metal support 130. , 121a. In the present embodiment, by using the metal support 130, the distance between the power transmission coupler 110 and the power reception coupler 120 can be extended more than twice as compared with the prior art.

  FIG. 3 shows the transmission efficiency η21 when the distance between the power transmission coupler 110 and the power reception coupler 120 is set to 450 mm using the metal support 130. For comparison, the transmission efficiency η21 in the comparative example 1 shown in FIG. 2 is shown in FIG. 3 and 4, the horizontal axis represents frequency, and changes in transmission efficiency η21 with respect to frequency are shown.

The transmission efficiency η21 indicates the efficiency of power transmission from the power transmission coupler 110 to the power reception coupler 120, and is given by η21 = | S21 | ² using the S parameter S21. 3 and 4, in addition to the transmission efficiency η21, the reflection loss η11 = | S11 | ² , and | S11 |, | S21 | are also shown.

  As shown in FIG. 4, in Comparative Example 1 in which the metal support 130 is not used, when the distance between the power transmission coupler 110 and the power reception coupler 120 is 200 mm, a transmission efficiency of about 96% is obtained at a resonance frequency of about 27 MHz. On the other hand, in this embodiment using the metal support 130, even if the distance between the power transmission coupler 110 and the power reception coupler 120 is extended to 450 mm, a transmission efficiency of about 96% is obtained at a resonance frequency of about 27 MHz. In this embodiment, the power transmission distance can be extended from 200 mm to 450 mm by using the metal support 130 as an electric field mediation medium.

  Next, the electric field distribution in the electric field resonance type wireless power transmission apparatus 100 of the present embodiment in which the metal support 130 is arranged at the center will be described in comparison with the electric field distribution in the comparative example 1 in which the metal support 130 shown in FIG. To do. First, the electric field distribution in Comparative Example 1 in which the metal support 130 is not disposed will be described with reference to FIG. The figure shows the charge distribution in the cross section of each coupler and the electric field distribution between the electrodes when viewed in a cross section passing through the central axis of the power transmission coupler 110 and the power receiving coupler 120.

  When AC power is supplied to the power transmission coupler 110, positive (+) charges and negative (−) charges are alternately distributed to the center electrode 111 and the outer peripheral electrode 112 in half cycles. In addition, the electric field vector changes from the direction of coupling between the center electrode and the outer peripheral electrode to the direction of coupling between the central electrodes and the outer circumferential electrode in a quarter cycle, and between the center electrode and the outer circumferential electrode in the next quarter cycle. One rotation is made in one cycle so as to change from the coupling direction to the coupling direction of the center electrode and the outer peripheral electrode. That is, the electric field coupling is performed between the center electrode 111 and the outer peripheral electrode 112, and the electric coupling is also performed between the power receiving coupler 120 and the electric power receiving coupler 120, for example, at a certain point in time as shown in FIG. Coupling is performed with an electric field distribution as shown in FIG. In the electric field distribution shown in FIG. 5A, negative charges are distributed on the center electrode 121 of the power receiving coupler 120, and positive charges are distributed on the outer peripheral electrode 122. Further, in the electric field distribution shown in FIG. 5B after a quarter cycle, positive charges are distributed in the center electrode 121 and negative charges are distributed in the center electrode 111 of the opposing power transmission coupler.

  On the other hand, FIG. 6 shows an electric field distribution in the electric field resonance type wireless power transmission apparatus 100 of the present embodiment in which the metal support 130 is arranged at the center. 6 shows the charge distribution in the cross section of each coupler and the electric field distribution between the electrodes when viewed in a cross section passing through the central axis of the power transmission coupler 110 and the power receiving coupler 120 as in FIG. FIGS. 6A and 6B show the electric charge and electric field distributions at the time points corresponding to FIGS. 5A and 5B, respectively. The electric charges distributed to the respective electrodes of the power transmission coupler 110 and the power receiving coupler 120 are the same in FIG. 5 when the metal column 130 is not disposed and in FIG. 6 when the metal column 130 is disposed.

  On the other hand, with regard to the electric field distribution, FIG. 6 shows that when the metal support 130 is disposed, each electrode of the power transmission coupler 110 and the power receiving coupler 120 is electrically coupled to the metal support 130. As a result, a flow of electric charge is generated in the metal support 130, and even when the distance between the power transmission coupler 110 and the power receiving coupler 120 is increased, electric power can be transmitted without reducing transmission efficiency due to electric field coupling via the metal support 130. It becomes possible. In the electric field distribution shown in FIG. 6A, strong electric field coupling mainly occurs between the outer peripheral electrode 112 and the center electrode 121 through the metal support 130. In the electric field distribution shown in FIG. 6B, strong electric field coupling mainly occurs between the center electrode 111 and the center electrode 121 via the metal support 130. FIGS. 7A and 7B show the electric field distributions shown in FIGS. 6A and 6B in more detail. In this case, the metal strut hardly contributes to the coupling between the center electrode 111 and the outer peripheral electrode 112 in the power transmission side coupler 110 and the coupling between the center electrode 121 and the outer peripheral electrode 122 in the power receiving side coupler 120, and mainly the transmission / reception coupler. This contributes to an increase in the bond between them.

  In the electric field resonance type wireless power transmission device 100 according to the present embodiment, the metal strut 130 is disposed on the central axis of the power transmission coupler 110 and the power reception coupler 120, thereby reducing the transmission distance between the power transmission coupler 110 and the power reception coupler 120. It is possible to expand to about 2.5 times. In addition, since the power transmission coupler 110 and the power reception coupler 120 of the present embodiment are formed concentrically around the central axis, the power reception coupler 120 is aligned with the rotation axis of the rotation body and the metal support 130. It is possible to wirelessly supply power to the rotating body by arranging.

  As an example, the rotating shaft of a working robot that works while rotating is used as the metal support 130, and the power receiving coupler 120 is installed in the working robot. On the other hand, by connecting the power transmission coupler 110, which is fixed by penetrating the rotating shaft through the through-hole 111a, to the AC power source, the power required for the work robot is wirelessly transmitted from the transmission coupler 110 to the power reception coupler 120. Can be supplied to the working robot.

(Second Embodiment)
An electric field resonance type wireless power transmission apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a perspective view showing the configuration of the electric field resonance type wireless power transmission device 200 of the present embodiment. The electric field resonance type wireless power transmission device 200 includes the metal support 130 as in the first embodiment, and in addition, a metal wall 240 is provided so as to surround the power transmission coupler 110 and the power reception coupler 120. .

  In the present embodiment, the power transmission coupler 110 and the power reception coupler 120 are surrounded by the metal wall 240 so that the electric field coupling is performed between the metal pillar 240 and the metal wall 240. More specifically, strong electric field coupling is applied between the center electrode 111 and the outer peripheral electrode 122 via the metal wall 240. In addition, after 1/4 cycle, strong electric field coupling is applied between the outer peripheral electrode 112 and the outer peripheral electrode 122 through the metal wall 240. The diameter of the metal wall 240 is preferably 1.2 times or less than the diameter of the outer peripheral electrodes 112 and 122. The space | interval (gap) between the outer periphery electrodes 112 and 122 and the metal wall 240 can be 20 mm, for example. The outer peripheral radius of the outer peripheral electrodes 112 and 122 is 240 mm, but the distance from the metal wall 240 is sufficiently small compared with this, preferably 1/10 or less, compared with the coupling between the central electrode and the outer peripheral electrode. Thus, the coupling between the metal wall 240 and the outer peripheral electrode is large, and the effect of extending the transmission distance can be obtained.

  In the electric field resonance type wireless power transmission device 200 of the present embodiment, the metal wall 240 is used as an electric field coupling mediator in addition to the metal support 130, and therefore the power transmission coupler 110 and the metal coupler 130 are connected via the metal support 130 and the metal wall 240. Stronger electric field coupling with the power receiving coupler 120 is realized. As a result, the distance between the power transmission coupler 110 and the power reception coupler 120 can be further increased without reducing the transmission efficiency. FIG. 9 shows the transmission efficiency η21 when the distance between the power transmission coupler 110 and the power reception coupler 120 is 600 mm. FIG. 9 shows a change in the transmission efficiency η21 of the electric field resonance type wireless power transmission device 200 of the present embodiment when the horizontal axis is the frequency.

  9, in addition to the transmission efficiency η21, reflection losses η11, | S11 |, and | S21 | are also shown in the same manner as FIGS. As shown in FIG. 9, in the electric field resonance type wireless power transmission device 200 of the present embodiment, even if the distance between the power transmission coupler 110 and the power reception coupler 120 is 600 mm, the comparative example 1 in which this distance is 200 mm and the distance is 450 mm. The transmission efficiency of about 96% can be realized at the same resonance frequency fc as the electric field resonance type wireless power transmission apparatus 100 of the first embodiment. According to the electric field resonance type wireless power transmission apparatus 200 of the present embodiment, it is possible to extend the transmission distance up to three times that of the first comparative example without reducing the transmission efficiency.

(Third embodiment)
An electric field resonance type wireless power transmission apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a perspective view showing a configuration of the electric field resonance type wireless power transmission device 300 of the present embodiment. The electric field resonance type wireless power transmission device 300 is provided with short plates 351 and 352 on the lower end and the upper end of the metal wall 240 provided in the electric field resonance type wireless power transmission device 200 of the second embodiment, respectively.

  The short plate 351 is connected to the lower end of the metal support 130 and the lower end of the metal wall 240, and the short plate 352 is connected to the upper end of the metal support 130 and the upper end of the metal wall 240. Thereby, the metal support | pillar 130 and the metal wall 240 are electrically short-circuited. By providing the short plates 351 and 352, the electromagnetic waves radiated from the power transmission coupler 110 and the power reception coupler 120 can be prevented from leaking outside.

  However, when the distance between the short plate 351 and the power transmission coupler 110 and the distance between the short plate 352 and the power reception coupler 120 are short, the electric field coupling between them becomes strong, and the electric field coupling between the power transmission coupler 110 and the power reception coupler 120 is achieved. Will become weaker. As a result, the power transmission efficiency from the power transmission coupler 110 to the power reception coupler 120 decreases.

  Therefore, in the electric field resonance type wireless power transmission device 300 of the present embodiment, the distance between the short plates 351 and 352 and the power transmission coupler 110 and the power receiving coupler 120 is equal to or more than 1/6 of the distance between the power transmission coupler 110 and the power receiving coupler 120, respectively. It is said. In the electric field resonance type wireless power transmission device 300 shown in FIG. 10, the distance between the power transmission coupler 110 and the power reception coupler 120 is 600 mm, which is the same as that of the electric field resonance type wireless power transmission device 200 of the second embodiment, and the short plate 351. , 352 and the distance between the power transmission coupler 110 and the power reception coupler 120 are 100 mm.

  FIG. 11 shows the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 300 configured as described above. FIG. 11 shows changes in the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 300 of this embodiment when the horizontal axis is the frequency, and also shows the reflection losses η11, | S11 |, and | S21 |. ing. The electric field resonance type wireless power transmission device 300 of this embodiment also achieves a transmission efficiency of about 95% at the resonance frequency fc, and the electric field resonance type wireless power transmission device 200 of the second embodiment without reducing the transmission efficiency. The same transmission distance can be realized.

(Fourth embodiment)
An electric field resonance type wireless power transmission device according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a cross-sectional view showing the configuration of the electric field resonance type wireless power transmission device 400 of the present embodiment. The electric field resonance type wireless power transmission device 400 according to the present embodiment includes a metal column 430, a metal wall 440, and short plates 351 and 352, similarly to the electric field resonance type wireless power transmission device 300 according to the third embodiment. FIG. 12 shows a cross-sectional view as seen in a cross section passing through the center of the metal support 430.

  The electric field resonance type wireless power transmission device 400 of the present embodiment is different from the electric field resonance type wireless power transmission device 300 of the third embodiment in that a part of the metal support 430 and the metal wall 440 is cut. The metal support 430 and the metal wall 440 are cut, for example, on a plane parallel to the power transmission coupler 110 (power reception coupler 120) so as to block the flow of electric charges in the direction connecting the power transmission coupler 110 and the power reception coupler 120.

  FIG. 13 shows Comparative Example 2 in a state where the metal support 430 and the metal wall 440 are cut. Here, the transmission distance between the power transmission coupler 110 and the power reception coupler 120 is set to 600 mm as in the third embodiment. When the metal column 430 and the metal wall 440 are cut and the flow of charge in the direction connecting the power transmission coupler 110 and the power reception coupler 120 is blocked, the flow of the electric field associated with the flow of charge is also blocked. As a result, the transmission efficiency realized by the metal support 130 and the metal wall 240 in the third embodiment is significantly deteriorated. However, since a capacity corresponding to the gap width is generated in the gap formed by cutting the metal support 430 and the metal wall 440, electric field coupling occurs and slight power transmission is performed.

  Therefore, in the present embodiment, two coupling electrodes 431 and two coupling electrodes 441 arranged to face each other are provided at the cut portions of the metal support 430 and the metal wall 440, respectively. Here, the width of the coupling electrode 431 is 100 mm, and the width of the coupling electrode 441 is 60 mm. By providing the coupling electrodes 431 and 441, a displacement current flows between the two coupling electrodes 431 facing each other and between the two coupling electrodes 441 facing each other, so that the charge flow is recovered. As a result, the flow of the electric field accompanying the flow of electric charge is also restored and the transmission efficiency is improved again.

  FIG. 14 shows the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 400 of the present embodiment. FIG. 15 shows the transmission efficiency η21 of Comparative Example 2 that does not have the coupling electrodes 431 and 441. 14 and 15 show changes in transmission efficiency η21 when the horizontal axis is frequency, and also show reflection losses η11, | S11 |, and | S21 |. In Comparative Example 2 that does not include the coupling electrodes 431 and 441 illustrated in FIG. 15, the transmission efficiency at the resonance frequency fc is significantly degraded to about 9.8%.

  On the other hand, in the electric field resonance type wireless power transmission device 400 of the present embodiment, the coupling electrodes 431 and 441 are provided, and the transmission distance between the power transmission coupler 110 and the power reception coupler 120 is set to 300 mm, so that FIG. As shown, the transmission efficiency at the resonance frequency fc is restored to about 95%. Although the transmission distance needs to be shorter than that in the third embodiment, the transmission distance is extended by about 1.5 times as compared with Comparative Example 1 that does not include the metal support 130 and the metal wall 240.

  In the above description, both the metal support 430 and the metal wall 440 of the electric field resonance type wireless power transmission apparatus 400 of the present embodiment are cut. However, the present invention is not limited to this, and only one of them is cut. It may be a thing. Although the short plates 351 and 352 are provided as in the third embodiment, the present invention is not limited to this, and the short plates 351 and 352 may not be provided as in the second embodiment.

(Fifth embodiment)
An electric field resonance type wireless power transmission apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 16 is a perspective view showing the configuration of the electric field resonance type wireless power transmission device 500 of this embodiment. The electric field resonance type wireless power transmission device 500 has a shape in which the metal column 130 and the metal wall 240 of the electric field resonance type wireless power transmission device 300 of the third embodiment are curved.

  In the electric field resonance type wireless power transmission device 500 according to the present embodiment, the metal support 530 and the metal wall 540 curved with a radius of curvature R = 300 mm are used so that the power transmission coupler 110 and the power reception coupler 120 are at an angle of approximately 90 °. It is arranged. In addition, short plates 351 and 352 are provided at the lower end and the upper end of the metal wall 540, respectively, as in the third embodiment. In the present embodiment, the power transmission coupler 110 and the power reception coupler 120 can be arranged at a predetermined angle, not limited to 90 °, and thereby, for example, a rotating body that rotates on a rotation surface at a predetermined angle, It becomes possible to supply power wirelessly.

  In the electric field resonance type wireless power transmission device 500 of the present embodiment, the transmission distance between the power transmission coupler 110 and the power reception coupler 120 is set to the third by arranging the power transmission coupler 110 and the power reception coupler 120 at an angle of approximately 90 °. If it is made the same as the electric field resonance type wireless power transmission apparatus 300 of the embodiment, the transmission efficiency is lowered. In order to achieve the same high transmission efficiency as that of the electric field resonance type wireless power transmission device 300, the transmission distance between the power transmission coupler 110 and the power reception coupler 120 is preferably about 480 mm. Of course, even if it is shorter than this, good transmission characteristics can be obtained, but physical formation of the metal casing becomes difficult. If the metal support is removed, the transmission characteristics are greatly degraded. In this embodiment, the transmission distance between the power transmission coupler 110 and the power reception coupler 120 is the length between two points where the metal support 530 intersects each coupler surface.

  FIG. 17 shows the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 500 of this embodiment in which the transmission distance is about 480 mm. FIG. 17 shows changes in the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 400 of the present embodiment when the horizontal axis is the frequency, and also shows the reflection losses η11, | S11 |, and | S21 |. ing. In the electric field resonance type wireless power transmission device 500 of this embodiment, the transmission efficiency is about 96% at the resonance frequency fc by setting the transmission distance to about 480 mm. Although the transmission distance needs to be shorter than the electric field resonance type wireless power transmission device 300 of the third embodiment in order to realize high transmission efficiency, the transmission of the comparative example 1 that does not have the metal support shown in FIG. It is possible to stretch up to about 2.4 times the distance.

  In the above description, the electric field resonance type wireless power transmission apparatus 500 according to the present embodiment is provided with the short plates 351 and 352 as in the third embodiment. The plates 351 and 352 may not be provided.

(Sixth embodiment)
An electric field resonance type wireless power transmission device according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 18 is a perspective view showing the configuration of the electric field resonance type wireless power transmission device 600 of this embodiment. The electric field resonance type wireless power transmission device 600 has a structure in which notches are formed in the power transmission coupler 110 and the power reception coupler 120 of the electric field resonance type wireless power transmission device 100 of the first embodiment. In addition, the following description is the same even when the notch part is formed only in any one of the power transmission coupler 110 and the power receiving coupler 120. FIG.

  In the electric field resonance type wireless power transmission device 600 shown in FIG. 18, notches 611a and 612a having a width of 5 mm in the radial direction are formed on the center electrode 611 and the outer peripheral electrode 612 of the power transmission coupler 610, respectively. Similarly, in the power receiving coupler 620, notches 621 a and 622 a having a width of 5 mm are formed in the radial direction in each of the center electrode 621 and the outer peripheral electrode 622. The radial direction of each notch may be different between the power transmission coupler 610 and the power reception coupler 620, and also different between the center electrode 611 and the outer peripheral electrode 612 and between the center electrode 621 and the outer peripheral electrode 622. It's okay.

  For comparison, notch portions similar to those of the electric field resonance type wireless power transmission device 600 are provided in each of the power transmission coupler 110 and the power reception coupler 120 of the electric field resonance type wireless power transmission device 90 of the first comparative example shown in FIG. FIG. 19 shows an electric field resonance type wireless power transmission device 90 ′ of Comparative Example 3 in which is formed.

  FIG. 20 shows the transmission efficiency η21 when using the power transmission coupler 610 and the power reception coupler 620 of the present embodiment in which the notch is formed. FIG. 20 shows changes in the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 600 of the present embodiment when the horizontal axis is the frequency, and also shows reflection losses η11, | S11 |, and | S21 |. ing. For comparison, FIG. 21 shows the transmission efficiency η21 of the electric field resonance type wireless power transmission device 90 'of the third comparative example.

  From FIG. 20, also in the electric field resonance type wireless power transmission device 600 of this embodiment, the transmission efficiency at the resonance frequency fc is about 96%, which is the same as that of the electric field resonance type wireless power transmission device 100 of the first embodiment. . From this, it is shown that a notch can be formed in the power transmission coupler and the power reception coupler without reducing the transmission efficiency. Also, the transmission efficiency η21 of the electric field resonance type wireless power transmission device 90 ′ of Comparative Example 3 shown in FIG. 21 is about 96%, which is almost the same as FIG. 4 showing the transmission efficiency when there is no notch. It has been.

(Seventh embodiment)
An electric field resonance type wireless power transmission device according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 22 is a perspective view showing the configuration of the electric field resonance type wireless power transmission device 700 (700a and 700b) of the present embodiment. In the present embodiment, the shape of the transmission / reception coupler is different from that of the first to sixth embodiments. The power transmission coupler 710 and the power reception coupler 720 of the electric field resonance type wireless power transmission apparatus 700 of this embodiment are each formed by arranging two rectangular metal plates in parallel on the same plane. The power transmission coupler 710 includes rectangular electrodes 711 and 712, to which inductors 713 and 714 are connected, respectively. The power receiving coupler 720 includes rectangular electrodes 721 and 722, to which inductors 723 and 724 are connected, respectively.

  In the electric field resonance type wireless power transmission device 700 shown in FIG. 22, the dimensions of the power transmission coupler 710 and the power reception coupler 720 are 250 mm × 250 mm, and between the rectangular electrodes 711 and 712 and between the rectangular electrodes 721 and 722, Each has a gap of 34 mm.

  Both the power transmission coupler 710 provided with the rectangular electrodes 711 and 712 and the power receiving coupler 720 provided with the rectangular electrodes 721 and 722 do not have axial symmetry. However, it is considered that the rectangular electrode is similar to the rectangular electrode having a larger notch formed in the power transmission / reception coupler of the electric field resonance type wireless power transmission device 600 of the sixth embodiment. Therefore, it can be estimated from the electric field resonance type wireless power transmission device 600 of the sixth embodiment that the transmission distance between the power transmission / reception couplers can be extended by arranging the metal plate in the vicinity of the power transmission / reception coupler using the rectangular electrodes.

  Therefore, in the electric field resonance type wireless power transmission device 700 of this embodiment, the metal plate 760 is disposed in the vicinity of the power transmission coupler 710 and the power reception coupler 720. In the electric field resonance type wireless power transmission device 700a shown in FIG. 22A, the side opposite to the other rectangular electrode 712 (or 711) of one rectangular electrode 711 (or 712) of the power transmission coupler 710, and the power receiving coupler A metal plate 760 is disposed close to the side opposite to the other rectangular electrode 722 (or 721) of one rectangular electrode 721 (or 722) of 720. Further, in the electric field resonance type wireless power transmission device 700b shown in FIG. 22B, two metal plates 760 are arranged on both sides of the power transmission coupler 710 and the power reception coupler 720. The width of the power transmission coupler 710 and the power reception coupler 720 is 250 mm. However, if the distance between the coupler and the metal plate 760 is sufficiently smaller than this, preferably 1/10 or less, the rectangular electrode 711 of the power transmission coupler Compared to the coupling of the electric field between 712 or the coupling of the electric field between the rectangular electrodes 721 and 722 of the power receiving coupler, the coupling between the metal plate and the rectangular electrode is large, and the effect of extending the transmission distance can be obtained.

  On the other hand, an electric field resonance type wireless power transmission apparatus that includes only a power transmission coupler and a power reception coupler made of rectangular electrodes and does not include a metal plate 760 is illustrated in FIG. In the electric field resonance type wireless power transmission device of Comparative Example 4, high transmission efficiency can be obtained when the transmission distance between the power transmission coupler 710 and the power reception coupler 720 is 200 mm.

  In the electric field resonance type wireless power transmission device 700 of the present embodiment, by providing the metal plate 760, the transmission distance between the power transmission coupler 710 and the power reception coupler 720 can be extended as compared with the comparative example 4. In the electric field resonance type wireless power transmission device 700a shown in FIG. 22 (a), the transmission distance can be extended to 300 mm corresponding to about 1.5 times that of the comparative example 4, and the electric field resonance type shown in FIG. In the wireless power transmission device 700b, the transmission distance can be extended to 700 mm corresponding to about 3.5 times that of the fourth comparative example.

  24 and 25 show the transmission efficiencies η21 of the electric field resonance type wireless power transmission apparatuses 700a and 700b and the comparative example 4 of the present embodiment when the transmission distance is set as described above. 24 and 25 show changes in transmission efficiency η21 when the horizontal axis is frequency, and also show reflection losses η11, | S11 |, and | S21 |. 24 and 25, the electric field resonance type wireless power transmission apparatuses 700a and 700b and the comparative example 4 of the present embodiment achieve a transmission efficiency of about 95%. The electric field resonance type wireless power transmission apparatuses 700a and 700b of the present embodiment can extend the transmission distance up to about 1.5 to 3.5 times that of Comparative Example 4 with the same transmission efficiency.

(Eighth embodiment)
An electric field resonance type wireless power transmission device according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 26 is a perspective view showing the configuration of the electric field resonance type wireless power transmission device 800 of this embodiment. The electric field resonance type wireless power transmission device 800 of this embodiment includes a power transmission coupler 110, a power reception coupler 120, and a metal column 130, as in the first embodiment. Although the transmission distance between the power transmission coupler 110 and the power reception coupler 120 can be extended by providing the metal support 130, the present embodiment further includes a relay coupler 870, thereby further extending the transmission distance. Is possible.

  The relay coupler 870 has a center electrode 871 and an outer peripheral electrode 872, and inductors 873 and 874 are connected to each of them. In the relay coupler 870, the inductors 873 and 874 are short-circuited. The center electrode 871, the outer peripheral electrode 872, and the inductors 873 and 874 of the relay coupler 870 can have the same dimensions as the power transmission coupler 110 and the power reception coupler 120, respectively. The relay coupler 870 is disposed between the power transmission coupler 110 and the power reception coupler 120, and the metal struts 130 are passed through the through holes formed in the center electrodes 111, 121, and 871, respectively. The electric field resonance type wireless power transmission apparatus 100 can be further extended.

  In the present embodiment, the transmission distance between the power transmission coupler 110 and the relay coupler 870 and the transmission distance between the relay coupler 870 and the power reception coupler 120 are each 450 mm, and between the power transmission coupler 110 and the power reception coupler 120. The transmission distance can be extended to 900 mm, which is twice as long as the transmission distance of the electric field resonance type wireless power transmission device 100 of the first embodiment. FIG. 27 shows the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 800 of this embodiment. FIG. 27 shows changes in the transmission efficiency η21 of the electric field resonance type wireless power transmission apparatus 800 of the present embodiment when the horizontal axis is frequency, and also shows reflection losses η11, | S11 |, and | S21 |. ing.

  As shown in FIG. 27, in the electric field resonance type wireless power transmission apparatus 800 of this embodiment, it is possible to realize a high transmission efficiency of about 92% even if the transmission distance is greatly extended to 900 mm.

  In addition, although the structure which added the relay coupler 870 to the electric field resonance type | mold wireless power transmission apparatus 100 of 1st Embodiment was demonstrated above, it is not limited to this, It is the same as that of the electric field resonance type wireless power transmission apparatus of other embodiment. It is also possible to add a relay coupler. For example, a metal wall may be provided so as to surround the power transmission coupler 110, the power reception coupler 120, and the relay coupler 870, and short plates may be provided at the upper and lower ends of the metal wall. Alternatively, the metal support and the metal wall may be curved. Furthermore, you may use a rectangular electrode for a power transmission / reception coupler and a relay coupler. The relay coupler can be applied to any of the above embodiments.

  The relay coupler 870 is not necessarily arranged at an intermediate position between the power transmission coupler 110 and the power reception coupler 120, and can be moved up and down within a predetermined range from the intermediate position, for example. An example in which the electric field resonance type wireless power transmission apparatus 800 of this embodiment is applied to a work robot is shown in FIG. Although not shown, the power receiving coupler 120 is supported by a base such as a dielectric, and a rectifier, a DC-DC converter, and a motor are connected to the end of the coupler. The power receiving coupler 120 is provided with a gripping arm 51. As the motor rotates, the power receiving coupler 120 rotates and the gripping arm 51 also rotates. Furthermore, the rotation of the motor is used to drive the gripping arm 51 through gears, cams, and the like. As a result, the gripping arm 51 can grip an arbitrary object within a certain distance from the power receiving coupler 120.

  Similarly, the relay coupler 870 is supported by a base such as a dielectric, and a rectifier, a DC-DC converter, and a motor are connected to the coupler. The relay coupler 870 is provided with a welding arm 52 and a screw fastening arm 53. As the motor rotates, the relay coupler 870 rotates, and the welding arm 52 and the screw fastening arm 53 also rotate. Also, the relay coupler 870, the welding arm 52, and the screw fastening arm 53 can be driven up and down by converting the rotation of the motor into a vertical driving force through a gear, a cam or the like. Further, the rotation of the motor is used to drive the welding arm 52 and the screw fastening arm 53. As a result, the welding arm 52 and the screw tightening arm 53 can perform welding and screw tightening operations on an arbitrary object within a certain distance from the region in which the relay coupler 870 can rotate and move vertically.

  Conventionally, such work robots have used a cable to send electric power to the motor. However, when a cable is used, the range of motion is limited due to cable handling and kinking resistance. With this configuration, there are no restrictions on operation due to cables, and the work area can be greatly expanded. When supplying power to the relay coupler 870, the output terminal of the power receiving coupler 120 is open, so that the output of the power transmission side coupler 110 can be efficiently sent to the relay coupler 870.

  As another example of the present embodiment, FIG. 29 shows an example in which the coupler is rectangular in the electric field resonance type wireless power transmission apparatus 800 and applied to a work lift. Although not shown, the power receiving coupler 720 is supported by a base such as a dielectric, and a rectifier, a DC-DC converter, and a motor are connected to the end of the coupler. The rotation of the motor is used to drive the power receiving coupler 720, that is, the top and bottom of the table through gears, cams and the like. That is, it is possible to place a load on the table and move the load in the vertical direction. Similarly, the relay coupler 870 is supported by a base such as a dielectric, and a rectifier, a DC-DC converter, and a motor are connected to the coupler. The rotation of the motor is used for driving the relay coupler 870, that is, up and down the base through gears, cams and the like. That is, it is possible to place a load on the table and move the load in the vertical direction. Such a work lift is generally accompanied by a wired cable, but with this configuration, it is freed from restrictions on the movable range of the lift associated with the handling of the cable. When power is supplied to the relay coupler 870, the output terminal of the power receiving coupler 720 is open, so that the output of the power transmission side coupler 710 can be efficiently sent to the relay coupler 870.

  In addition, the description in this Embodiment shows an example of the electric field resonance type | mold wireless electric power transmission apparatus which concerns on this invention, and is not limited to this. The detailed configuration, detailed operation, and the like of the electric field resonance type wireless power transmission device in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

100, 200, 300, 400, 500, 600, 700, 800 Field resonance type wireless power transmission device 110, 610, 710 Power transmission coupler 111, 121, 611, 621, 871 Center electrode 111a, 121a Through hole 112, 122, 612 , 622, 872 Peripheral electrodes 113, 114, 123, 124, 713, 714, 723, 724, 873, 874 Inductors 120, 620, 720 Power receiving couplers 130, 430, 530 Metal columns 240, 440, 540 Metal walls 351, 352 Short plate 431, 441 Coupling electrode 611a, 612a, 621a, 622a Notch 711, 712, 721, 722 Rectangular electrode 760 Metal plate 870 Relay coupler

Claims (9)

A power transmission coupler and a power reception coupler each having two electrodes and an inductor connected in series to the two electrodes;
With a predetermined distance and a conductor which is disposed close to said power receiving coupler and the power coupler,
The two electrodes are composed of a central electrode arranged at the center and an outer peripheral electrode arranged apart from the outer circumference of the central electrode,
The conductor is a metal column formed in a columnar shape,
An electric field resonance type wireless power transmission device , wherein a circular through hole is formed at the center of each of the center electrodes of the power transmission coupler and the power receiving coupler, and the metal support is penetrated in a non-contact manner . A metal wall disposed at a predetermined separation distance on the outer peripheral electrode of each of the power transmission coupler and the power reception coupler;
2. The electric field resonance type wireless power transmission device according to claim 1, wherein the diameter of the metal wall is 1.2 times or less of the diameter of the outer peripheral electrode. A short plate is provided on each of the end on the power transmission coupler side of the metal wall and the end on the power reception coupler side, and both ends of the metal support are connected,
The distance between the power transmission coupler and the short board adjacent to the power transmission coupler and the distance between the power reception coupler and the short board adjacent to each other are each 1/6 or more of the distance between the power transmission coupler and the power reception coupler. The electric field resonance type wireless power transmission device according to claim 2. The metal strut and / or the metal wall is cut and separated into the power transmission coupler side and the power receiving coupler side;
4. The electric field resonance type wireless power transmission device according to claim 2, wherein electrodes for capacitive coupling are provided at both ends of the cut. The electric field according to any one of claims 2 to 4, wherein the metal column and the metal wall are curved so that the power transmission coupler and the power reception coupler are arranged at a predetermined angle. Resonance type wireless power transmission device. The electric field resonance according to any one of claims 1 to 4, wherein a notch in a radial direction is formed in the central electrode and the outer peripheral electrode of the power transmission coupler and / or the power reception coupler. Type wireless power transmission device. A power transmission coupler and a power reception coupler each having two electrodes and an inductor connected in series to the two electrodes;
A conductor that is disposed close to the power transmission coupler and the power reception coupler with a predetermined separation distance; and
The two electrodes are formed in a rectangular shape and arranged in parallel,
The conductor is Ri metal plate der disposed with a predetermined distance to one or both of the opposite sides to the opposite sides of each of the two electrodes of the power coupler and the power receiving coupler,
The metal plate is disposed along a direction in which these electrodes face each other so as to be coupled to one electrode of the power transmission coupler and one electrode of the power reception coupler. Wireless power transmission device. 8. The electric field resonance type wireless power transmission according to claim 7, wherein a distance between the power transmission coupler and the power reception coupler and the metal plate is not more than 0.1 times a width of the power transmission coupler and the power reception coupler. 9. apparatus. Between the power coupler and the power receiving coupler, according to claim 7 or 8, characterized in that the relay coupler is disposed with the two electrodes and the inductor having the same shape as the power coupler and the power receiving coupler Electric field resonance type wireless power transmission device.

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