JP2020047896A - Coil pair, power transmission device, power reception device and power transmission system - Google Patents

Abstract

To provide a non-contact power transmission system which can optimize power transmission efficiency.SOLUTION: A power transmission coil for non-contact power transmission includes a power transmission open coil and a power transmission loop coil TL. The power transmission loop coil TL has a series connection in which an outside-inside copper thin film line TCL1, which is wound concentrically from the outer peripheral side toward the inner peripheral side, is connected to an inside-outside copper thin film line TCL2, which is wound concentrically from the inner peripheral side toward the outer peripheral side in the same winding direction as the outside-inside winding line TCL1. Each winding line is wound in a manner that the center of the winding of the outside-inside copper thin film line TCL1 coincides with the center of the winding of the inside-outside copper thin film line TCL2. In the power transmission loop coil TL, both end parts in the above series connection configure a connection terminal O1 and a connection terminal O2, respectively, at the outermost periphery.SELECTED DRAWING: Figure 6

Description

  The present invention belongs to the technical field of a coil pair, a power transmitting device, a power receiving device, and a power transmission system. More specifically, the present invention belongs to the technical field of a non-contact type power transmission coil pair, a non-contact type power transmission device and a power reception device using the coil pair, and a power transmission system.

  In recent years, electric vehicles equipped with a storage battery such as a lithium ion battery have become widespread. In such an electric vehicle, the motor is driven by using the electric power stored in the storage battery to move, so that efficient charging of the storage battery is required. As a method of charging a storage battery mounted on an electric vehicle without physically connecting a charging plug or the like to the electric vehicle, a so-called wireless power transmission using a power receiving coil and a power transmitting coil which are spaced apart from each other and opposed to each other. Research on is being conducted. In general, wireless power transmission methods include an electric field coupling method, an electromagnetic induction method, and a magnetic field resonance method. When these methods are compared in terms of, for example, operating frequency, positional freedom in each of horizontal and vertical directions, transmission efficiency, and the like, as a method of wireless power transmission for charging a storage battery mounted on an electric vehicle, An electric field coupling method using a capacitor or a magnetic field resonance method using a coil is expected to be promising, and research and development on these methods are being actively conducted. As a prior art document that discloses such a background technology, for example, Patent Document 1 below is given. Patent Document 1 discloses a coil that performs power transmission by a magnetic field resonance method using a single-turn (one-turn) loop coil and a 5.5-turn (5.5-turn) open coil. ing.

JP 2011-200045 A

  On the other hand, the wireless power transmission system of the above-described method needs to comply with the regulations such as the Radio Law in the country where the wireless power transmission system is used, for example, because it is used outdoors. . At this time, the above-mentioned regulations regulate the leakage magnetic field to be equal to or lower than a predetermined level in consideration of, for example, the influence on the human body. In addition, in order to enable interconnection use between all the power transmission coils and the power reception coils in order to ensure wide versatility, as a result, both need to use a predetermined range of frequencies. For this reason, the predetermined range of frequencies or frequency bands also needs to follow the recommendations of international organizations such as ISO (International Organization for Standardization) or IEC (International Electrotechnical Commission) as the above regulations. Furthermore, since the lower limit value of the power transmission efficiency taking into account the predetermined positional deviation between the power transmission coil and the power reception coil is also specified by the international organization, as a result, the high power transmission efficiency at a specific frequency is obtained. Is required.

  Accordingly, the present invention has been made in view of the above-described demand, and an example of the problem is a non-contact type power transmission coil pair that can further optimize power transmission efficiency, and a coil pair for the same. An object of the present invention is to provide a non-contact type power transmitting device, a power receiving device, and a power transmission system used.

  In order to solve the above-described problem, the invention according to claim 1 provides a coil pair for non-contact power transmission, a first coil for power transmission or reception, and power to be transmitted during power transmission, A second coil to which received power is output at the time of power reception, and a second coil concentrically laminated with respect to the first coil, wherein the second coil is provided on an outer peripheral side of the second coil. And the outer and inner windings concentrically wound toward the inner circumference side, and the second coil is wound concentrically from the inner circumference side to the outer circumference side and in the same winding direction as the outer and inner winding lines. And an internal / external winding circuit, and both ends of the second coil are external connection terminals at the outermost periphery of the second coil.

  According to the first aspect of the present invention, the second coil concentrically laminated with the first coil has a series connection in which the outer and inner windings and the inner and outer windings are connected, and both ends in the series connection. Since each of the portions is an external connection terminal at the outermost periphery of the coil pair, it is possible to further optimize the power transmission efficiency of the entire coil pair.

  In order to solve the above-described problem, the invention according to claim 2 is the coil pair according to claim 1, wherein the outer and inner windings and the inner and outer windings are respectively formed by the outer and inner windings in the second coil. The winding is performed so that the center of the winding of the winding and the center of the winding of the inner and outer windings coincide with each other.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, each winding line is so arranged that the center of winding of the outer and inner winding lines coincides with the center of winding of the inner and outer winding lines. Is wound, so that transmission efficiency can be improved.

  In order to solve the above problem, according to a third aspect of the present invention, in the coil pair according to the first or second aspect, in the second coil, the outer and inner windings and the inner and outer windings are connected to each other. Are wound in one layer while being insulated from each other.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the outer and inner windings and the inner and outer windings are wound in one layer while being insulated from each other. Since the coil pair is turned, optimization of power transmission efficiency of the entire coil pair and miniaturization of the coil pair can be achieved at the same time.

  According to a fourth aspect of the present invention, there is provided a coil pair according to the first or second aspect, wherein the second coil has a layer on which the outer and inner windings are formed. And the layer on which the inner and outer windings are formed are laminated with an insulating portion interposed therebetween.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 1 or 2, the layer in which the outer and inner windings are formed and the layer in which the inner and outer windings are formed are different from each other. Since they are stacked with the insulating portion interposed therebetween, the power transmission efficiency of the coil pair as a whole can be further optimized.

  According to a fifth aspect of the present invention, there is provided a coil pair according to any one of the first to fourth aspects, wherein the position of the second coil in a radial direction of the coil pair is set. Is the position corresponding to the position of the first coil in the radial direction, and the position in the radial direction of the winding wound around the outermost periphery in the second coil is the outermost periphery in the first coil. The position corresponding to the position in the radial direction of the wound winding, the radial position of the winding wound in the innermost circumference in the second coil, the innermost circumference in the first coil The position corresponds to the position in the radial direction of the wound winding line.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, the position of the second coil in the radial direction of the coil pair is equal to the position of the second coil in the radial direction. The position corresponding to the position of one coil, and the radial position of the coil pair of the winding wound on the outermost circumference in the second coil is the radial direction of the winding wound on the outermost circumference in the first coil. , And the radial position of the innermost winding of the second coil is the radial position of the innermost winding of the first coil. It is a position corresponding to. Therefore, as a result, the winding wound on the outermost circumference in the second coil is separated from the winding wound on the innermost circumference in the second coil, and the power transmission efficiency is effectively reduced. Can be optimized.

  According to a sixth aspect of the present invention, there is provided a coil pair according to any one of the first to fifth aspects, wherein each of the outer and inner windings and the inner and outer windings is provided. The number of times is configured to be not less than one and a half and not more than three times.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, the number of turns of each of the outer and inner winding lines and the inner and outer winding lines is one and a half times or more. Since the number is three or less, power transmission efficiency can be effectively optimized.

  According to a seventh aspect of the present invention, there is provided a coil pair according to any one of the first to sixth aspects, wherein each of the first coils is concentrically wound. The plurality of windings are stacked with an insulating portion interposed therebetween.

  According to the seventh aspect of the invention, in addition to the functions of the first to sixth aspects of the invention, the first coil includes a plurality of winding lines each concentrically wound with the insulating portion interposed therebetween. Therefore, the power transmission efficiency and the reflectivity of the coil pair can be improved.

  In order to solve the above-mentioned problem, the invention according to claim 8 is configured by a power transmission device and a power reception device separated from the power transmission device, and transmits power from the power transmission device to the power reception device in a non-contact manner. The power transmission device included in the power transmission system, wherein the power transmission coil pair as the coil pair according to any one of claims 1 to 7, and an output that outputs power to be transmitted to the power transmission coil pair. Means.

  In order to solve the above-described problem, the invention according to claim 9 includes a power transmission device and a power reception device separated from the power transmission device, and transmits power from the power transmission device to the power reception device in a non-contact manner. In the power receiving device included in the power transmission system, the coil pair according to any one of claims 1 to 7, wherein the power receiving coil pair is disposed to face the power transmitting device, Input means connected to the power receiving coil pair.

  In order to solve the above problem, an invention according to claim 10 is a power transmission device according to claim 8 and a power reception device that is separated from the power transmission device and disposed to face the power transmission coil pair. And a power receiving device that receives the power transmitted from the power transmitting device.

  In order to solve the above problem, an invention according to claim 11 is a power transmission device and the power reception device according to claim 9, wherein the power reception device is separated from the power transmission device and the power reception coil pair is connected to the power transmission device. And a power receiving device that is arranged to face and receives the power transmitted from the power transmitting device.

  According to the invention as set forth in any one of claims 8 to 11, at least one of a power transmission coil body provided in a power transmission device constituting a power transmission system and a power reception coil body provided in a power reception device. Is a coil body according to any one of claims 1 to 7, so that the power transmission efficiency of the entire power transmission system can be optimized.

  According to the present invention, the second coil concentrically laminated with the first coil includes a series connection in which the outer and inner windings and the inner and outer windings are connected, and each of both ends in the series connection is a coil. The outermost portion of the pair serves as an external connection terminal.

  Therefore, the power transmission efficiency of the entire coil pair can be optimized.

FIG. 1 is a block diagram illustrating a schematic configuration of a power transmission system according to a first embodiment. It is a top view (i) showing the structure of the coil of a 1st embodiment. It is a top view (ii) showing the structure of the coil of a 1st embodiment. It is a top view (iii) showing the structure of the coil of a 1st embodiment. It is a top view (iv) showing the structure of the coil of a 1st embodiment. It is a top view (v) showing the structure of the coil of a 1st embodiment. It is a top view (vi) showing the structure of the coil of a 1st embodiment. It is a top view (vii) showing the structure of the coil of a 1st embodiment. FIG. 9 is a cross-sectional view taken along the line A-A ′ in FIGS. 6 to 8. It is a graph which shows the relationship of the reflection / transmission efficiency-frequency as an effect by the structure of the coil of 1st Embodiment. It is a top view (i) showing the structure of the coil of a 2nd embodiment. It is a top view (ii) showing the structure of the coil of a 2nd embodiment. It is a top view (iii) showing the structure of the coil of a 2nd embodiment. It is a top view (iv) showing the structure of the coil of a 2nd embodiment. It is a top view showing the structure of the coil of a 3rd embodiment. It is a top view showing the structure of the coil of a 4th embodiment. It is a top view showing the structure of the coil of a 5th embodiment. It is a top view showing the structure of the coil of a 6th embodiment. FIG. 7 is a graph illustrating the relationship between reflection and transmission efficiency and frequency as an effect of the coil structure of each of the second to sixth embodiments.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. Note that each embodiment described below is a power transmission method that transmits electric power for charging a rechargeable battery mounted on an electric vehicle to an electric vehicle equipped with the rechargeable battery in a non-contact manner by a magnetic field resonance method. This is an embodiment when the present invention is applied to a system.

  Here, the power transmission system based on the magnetic field resonance method of each embodiment includes a power transmission coil for transmitting power, and a power transmission coil that is disposed so as to be spaced apart from (ie opposed to) the power transmission coil and transmitted from the power transmission coil. And a power receiving coil for receiving power. The power transmission coil is configured by concentrically laminating a power transmission loop coil described later and a power transmission open coil described later. The power receiving coil is configured such that a power receiving open coil described later and a power receiving loop coil described later are concentrically stacked.

(I) First Embodiment First, a first embodiment according to the present invention will be described with reference to FIGS.

(I) Overall Configuration and Operation of Power Transmission System of First Embodiment First, the overall configuration and operation of the power transmission system of the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating a schematic configuration of the power transmission system according to the first embodiment.

  As shown in FIG. 1, the power transmission system S of the first embodiment includes a power receiving device R including a power receiving unit RV and the power receiving coil RC, a power transmitting device T including a power transmitting unit TR and the power transmitting coil TC, It consists of. At this time, the power receiving device R is mounted on the electric vehicle and connected to a storage battery (not shown) mounted on the electric vehicle. On the other hand, the power transmission device T is installed on the ground at a position where the electric vehicle moves or stops. Then, when charging the storage battery, the electric vehicle is driven or stopped such that the power receiving coil RC of the power receiving device R and the power transmitting coil TC of the power transmitting device T face each other. When the storage battery is charged by the power transmission system S according to the first embodiment, the power transmission device installed on the ground below the stopped position with respect to the power reception device R mounted on the stopped electric vehicle. The power transmission device T can be configured to transmit power via the T power transmission coil TC. In addition, a power receiving device R mounted on a moving electric vehicle is transmitted via a power transmission coil TC of a plurality of power transmitting devices T installed in a section of a fixed distance on a road on which the electric vehicle is moving. Thus, the power transmission device T may be configured to transmit power continuously. At this time, the power transmitting unit TR corresponds to an example of the “output unit” of the present invention, and the power receiving unit RV corresponds to an example of the “input unit” of the present invention.

  On the other hand, the power transmission coil TC includes a power transmission loop coil TL and a power transmission open coil TO. The power receiving coil RC includes a power receiving open coil RO and a power receiving loop coil RL. At this time, the power to be transmitted is input from the power transmission unit TR to the power transmission loop coil TL. The power transmission open coil TO is stacked concentrically with respect to the power transmission loop coil TL, and both ends thereof are open. On the other hand, the power receiving open coil RO is arranged to face the power transmitting open coil TO, and both ends thereof are open. The power receiving loop coil RL is stacked concentrically with the power receiving open coil RO, and outputs power received from the power transmitting coil TC by a magnetic field resonance method to the power receiving unit RV. At this time, the power transmission coil TC or the power reception coil RC corresponds to an example of the “coil pair” of the present invention, and the power transmission open coil TO or the power reception open coil RO corresponds to an example of the “first coil” of the present invention. The coil TL or the power receiving loop coil RL corresponds to an example of the “second coil” of the present invention.

  In the above configuration, the power transmission unit TR of the power transmission device T outputs power to be transmitted to the power reception device R to the power transmission coil TC while complying with, for example, the above-mentioned regulations in a country where the power transmission system S is used. On the other hand, the power receiving coil RC of the power receiving device R that has received the power from the power transmitting coil TC by the magnetic field resonance method outputs the received power to the power receiving unit RV. Thus, the power receiving unit RV converts an output corresponding to the power (for example, high-frequency power of 85 kHz) into a DC (direct current) current by a power conversion unit (not shown) and outputs the DC current to a storage battery of the electric vehicle. Thereby, the storage battery is charged with a necessary amount of power.

(Ii) Configuration of power transmission coil TC (power reception coil RC) Next, the configuration of the power transmission coil TC and the power reception coil RC of the first embodiment used in the above-described power transmission system S of the first embodiment will be described with reference to FIG. This will be described with reference to FIGS. The power transmission coil TC and the power reception coil RC of the first embodiment have basically the same configuration. That is, the configuration of the power transmission loop coil TL and the configuration of the power reception loop coil RL are basically the same. The configuration of the power transmission open coil TO and the configuration of the power reception open coil RO are basically the same. Furthermore, the positional relationship between the power transmitting loop coil TL and the power transmitting open coil TO in the power transmitting coil TC and the positional relationship between the power receiving loop coil RL and the power receiving open coil RO in the power receiving coil RC are basically the same. Are identical. Therefore, in the following description, the structure of the power transmission coil TC will be described. 2 to 8 are plan views showing the structure of the power transmission coil TC of the first embodiment, and FIG. 9 is a partial cross-sectional view showing the structure of the power transmission coil TC of the first embodiment. 2 to 8 are plan views of the power transmission device T when the power transmission coil TC is viewed from the power transmission unit TR side.

  As shown in a plan view in FIG. 2, the power transmission coil TC of the first embodiment has a power transmission loop coil TL (see FIG. 1) and a power transmission open coil TO (see FIG. 1) in the paper direction of FIG. 2. It is constituted by being laminated on. The power transmission loop coil TL includes a loop coil TCL1 whose planar shape is shown in FIG. 2 and a loop coil TCL2 not shown in FIG. 2 and an insulating film BF1 shown in FIG. 2 (details will be described later). Are stacked in the direction of the paper surface of FIG. The power transmission open coil TO is formed by laminating two coils CL1 and CL2 described later via an insulating film BF3 (details will be described later) not shown in FIG. You. Then, an insulating film BF2 (details will be described later), which is made of the same material as the films BF1 and BF3 and is not shown in FIG. 2, is also stacked between the power transmission loop coil TL and the power transmission open coil TO. . In the first embodiment, the film BF1 is used for insulation between the loop coil TCL1 and the loop coil TCL2 which constitute the power transmission loop coil TL, and the film BF1 is used for insulation between the power transmission loop coil TL and the power transmission open coil TO. Although a film BF2 is used for the insulation and a film BF3 is used for insulation between the coil CL1 and the coil CL2, an insulating material such as a glass epoxy material may be used between the respective layers. it can. In order to efficiently dissipate the heat generated by the power transmission coil TC, for example, a thin film material in which ceramic particles or the like are dispersed can be used for insulation. Furthermore, the centers of the windings of the below-described copper thin film wires constituting the loop coil TCL1, the loop coil TCL2, the coil CL1, and the coil CL2 are the same or substantially the same.

  Then, as shown in FIG. 2, the outermost peripheral end (the center of the right side in FIG. 2) of the loop coil TCL1 of the power transmission loop coil TL is a connection terminal O1 connected to the power transmission unit TR. ing. The loop coil TCL1 is, for example, a copper film wire spirally wound one turn and a half turn (1.5 turns) from the outermost peripheral portion toward the innermost peripheral portion, starting from the connection terminal O1. It is configured. This copper thin film wire constituting the loop coil TCL1 corresponds to an example of the “outer / inner winding circuit” of the present invention. The copper thin film wire forming the loop coil TCL1 has the same width and the same thickness over the entire circumference of the loop coil TCL1. Further, in the loop coil TCL1, linear portions are provided at each of the upper side, lower side, left side, and right side in FIG. 2, and the respective linear portions are connected by curved portions. Here, the distance w between the first turn copper thin film wire and the second turn copper thin film wire of the copper thin film wire constituting the loop coil TCL1 is determined by the position of the loop coil TCL1 itself in the stacking direction. It is desirable that the length be as long as possible in a range where the position overlaps the TCL2 and the coils CL1 and CL2 of the power transmission open coil TO. A via V1 is connected to the innermost peripheral portion of the loop coil TCL1 to form an electrical connection with the loop coil TCL2 stacked immediately below the innermost portion in the paper surface direction of FIG.

  Next, the configuration of the loop coil TCL2 that constitutes the power transmission loop coil TL and that is stacked immediately below the loop coil TCL1 via the film BF1 will be described with reference to FIG. FIG. 3 is a plan view showing only the loop coil TCL2.

  As shown in FIG. 3, the via V1 for forming an electrical connection with the loop coil TCL1 is connected to the innermost peripheral portion of the loop coil TCL2 of the power transmission loop coil TL. That is, the connection between the loop coil TCL1 and the loop coil TCL2 is connected in series. Then, in the loop coil TCL2, for example, a copper thin film wire spirally moves in a counterclockwise direction starting from the via V1 (that is, in the same winding direction as the loop coil TCL1) from the innermost periphery to the outermost periphery. It is configured by winding one and a half turns (1.5 turns). The outermost end (the center of the right side in FIG. 3) is another connection terminal O2 connected to the power transmission unit TR. The copper thin film wire constituting the loop coil TCL2 corresponds to an example of the “inner / outer winding” of the present invention. The copper thin film wire forming the loop coil TCL2 has the same width and the same thickness over the entire circumference of the loop coil TCL2. Further, in the loop coil TCL2, a straight portion is provided at each of the upper side, the lower side, the left side, and the right side in FIG. 3, and the respective straight portions are connected by a curved portion. Here, the distance between the first turn copper thin film wire and the second turn copper thin film wire in the copper thin film wire constituting the loop coil TCL2 is the distance w (see FIG. 2) in the loop coil TCL1. Are identical.

  Here, as a positional relationship between the copper thin film wires constituting the loop coil TCL1 and the loop coil TCL2, respectively, the copper coil of the loop coil TCL1 wound one-half turn (1.5 turns) counterclockwise. The position of the center of the winding of the thin film wire substantially coincides with the position of the center of the winding of the copper thin film wire of the loop coil TCL2 wound one and a half turns (1.5 turns) counterclockwise. Each of the copper thin-film wires is wound so as to perform the same. The loop coil TCL1 and the loop coil TCL2 are connected in series by vias V1 connected to the innermost peripheral portions. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the loop coil TCL1 is connected to the loop coil TCL2 by changing the layer through the via V1 while maintaining the same winding direction. It means that it is wound from the peripheral part to the outermost peripheral part. The outermost ends of the outermost ends are the connection terminals O1 and O2 at positions adjacent to each other.

  Next, the configuration of the coil CL1 that constitutes the power transmission open coil TO and that is stacked immediately below the loop coil TCL2 of the power transmission loop coil TL via the film BF2 will be described with reference to FIG. FIG. 4 is a plan view showing only the coil CL1.

  As shown in FIG. 4, the outermost peripheral end of the coil CL1 constituting the power transmission open coil TO is an open end T1. Then, for example, a copper thin film wire is spirally wound ten turns and a half (10.5 turns) from the outermost peripheral portion toward the innermost peripheral portion in a counterclockwise direction starting from the open end T1. It is configured. In addition, a via V2 for forming an electrical connection with the coil CL2 stacked immediately below in the direction of the paper surface of FIG. 4 is connected to the innermost peripheral portion. The copper thin film wire forming the coil CL1 has the same thickness and the same width all around the coil CL1. Further, in the coil CL1, the upper side, the lower side, the left side, and the right side in FIG. 4 are provided with parallel straight portions, respectively, and the straight portions are respectively connected by substantially concentric arc-shaped curved portions. I have.

  Next, the configuration of the coil CL2 laminated immediately below the coil CL1 via the film BF3 will be described with reference to FIG. FIG. 5 is a plan view showing only the coil CL2.

  As shown in FIG. 5, the coil CL2 which forms the power transmission open coil TO together with the coil CL1 has the via V2 connected to the innermost portion thereof for forming an electrical connection with the coil CL1. . That is, the connection between the coil CL1 and the coil CL2 is a series connection. Then, the coil CL2 is rotated clockwise starting from the via V2 (that is, in a direction opposite to the coil CL1) from the innermost peripheral portion to the outermost peripheral portion, for example, by a two-and-a-half turn of a copper thin film wire in a spiral shape. (2.5 turns). The outermost end is an open end T2. The copper thin film wire constituting the coil CL2 has the same thickness and the same width over the entire circumference of the coil CL2. Further, in the coil CL2, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. 5, respectively, and the respective straight parts are respectively connected by substantially concentric arc-shaped curved parts. I have.

  Here, as for the positional relationship between the copper thin film wires constituting the coil CL1 and the coil CL2, the number of turns differs between ten and a half turns (10.5 turns) and two and a half turns (2.5 turns). However, the position of the copper thin film wire of the coil CL1 wound counterclockwise and the position of the copper thin film wire of the coil CL2 wound clockwise correspond to the coil CL1 and the coil CL2. Each copper thin film wire is wound so as to match when viewed from the center of each winding. The coil CL1 and the coil CL2 are connected in series by the via V2 connected to the innermost peripheral portion. Thereby, the coil CL2 is wound from the innermost peripheral portion to the outermost peripheral portion by turning (turning) the winding from the outermost peripheral portion to the innermost peripheral portion in the opposite direction at the innermost peripheral portion. Will be. Therefore, as a result, as shown in FIGS. 4 and 5, the width of the copper thin film line forming the coil CL1 is smaller than the width of the copper thin film line forming the coil CL2.

  Next, the positional relationship between the copper thin film wires constituting the power transmission loop coil TL (that is, the loop coil TCL1 and the loop coil TCL2) and the power transmission open coil TO (that is, the coil CL1 and the coil CL2) will be described with reference to FIGS. This will be described with reference to FIG.

  First, the positional relationship between the copper thin film wires constituting the loop coil TCL1 and the loop coil TCL2 of the power transmission loop coil TL will be described with reference to FIG. FIG. 6 is a plan view showing an overlapping state of the loop coil TCL1 and the loop coil TCL2. The loop coil TCL1 is indicated by a solid line, and a film BF1 (not shown in FIG. 6) immediately below the loop coil TCL1. The stacked loop coils TCL2 are indicated by broken lines.

  As shown by the broken line in FIG. 6, the copper thin film wire is wound one and a half turns (1.5 turns) in the same winding direction as the loop coil TCL1 from the inner circumference to the outer circumference, and the via V1 is formed at the innermost circumference thereof. In the loop coil TCL2 connected to the loop coil TCL1, the pitch in the winding of the copper thin film wire (that is, the center line of the copper thin film wire adjacent on each side in the radial direction in the winding) Each of the curved portions is formed and the copper thin film wire is wound so that the position of the linear portion is shifted toward the outer peripheral side by one-third of the distance. Is formed in a shape protruding to the outermost peripheral side of the main body. On the other hand, as shown by the solid line in FIG. 6, a copper thin film wire is wound by one and a half turns (1.5 turns) from the outer periphery to the inner periphery, and is connected to the loop coil TCL2 by the via V1 at the innermost periphery. In the loop coil TCL1, each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by one third of the pitch in the winding of the copper thin film wire for each half turn thereof. Is wound, and the connection terminal O1 is shaped to protrude to the outermost peripheral side of the winding. As a result, in the loop coil TL in which the loop coil TCL1 and the loop coil TCL2 are stacked, as shown in FIG. 6, the copper thin film wires constituting the loop loop coil TCL1 and the loop coil TCL2 overlap on each of the left and right sides. It is laminated as follows.

  Next, the positional relationship between the copper thin film wires constituting the loop coil TC2 and the coil CL1 of the power transmission open coil TO will be described with reference to FIG. FIG. 7 is a plan view showing the overlapping state of the loop coil TCL2 and the coil CL1, in which the loop coil TCL2 is laminated by a solid line and directly under the film BF2 (not shown in FIG. 7). Are indicated by broken lines, respectively.

  As shown by a broken line in FIG. 7, a copper thin film wire is wound ten and a half turns (10.5 turns) from the outer periphery to the inner periphery, and a coil CL2 (shown in FIG. The coil CL1 is connected to each of the curved lines so that the position of the linear portion is shifted toward the inner peripheral side by one-fourth of the pitch in the winding of the copper thin film wire every quarter turn. The portion is formed and the copper thin film wire is wound. On the other hand, as shown by the solid line in FIG. 7, the copper thin film wire constituting the loop coil TCL2 is laminated near the outer edge and the inner edge of the coil CL1 along the outer edge and the inner edge, respectively. As a result, in the power transmission open coil TO in which the loop coil TCL2 and the coil CL1 are stacked, as shown in FIG. 7, the copper thin film wires constituting the loop coil TCL2 and the coil CL1 overlap on each of the upper, lower, left, and right sides. Are laminated.

  Finally, the positional relationship between the copper thin film wires constituting the coil CL1 and the coil CL2 of the power transmission open coil TO will be described with reference to FIG. FIG. 8 is a plan view showing the state of overlap between the coil CL1 and the coil CL2. The coil CL1 is shown by a solid line, and the coil CL1 is stacked immediately below the film BF3 (not shown in FIG. 8). Are indicated by broken lines.

  As shown by a broken line in FIG. 8, a coil CL2 is formed by winding a copper thin film wire two and a half turns (2.5 turns) from the inner circumference to the outer circumference and connecting to the coil CL1 by the via V2 at the innermost circumference. In each of the quarter rounds, each curved portion is formed and the copper thin film wire is wound so that the position of the straight line portion is shifted toward the outer peripheral side by one quarter of the pitch in the winding of the copper thin film wire. The outermost end is an open end T2. On the other hand, as shown by the solid line in FIG. 8, the copper thin film wires constituting the coil CL1 are laminated along the vicinity of the outer edge and the inner edge of the coil CL2, and the outermost end is an open end T1. . Thus, the power transmission coil TC in which the power transmission open coil TO formed by stacking the coil CL1 and the coil CL2 and the power transmission loop coil TL formed by stacking the loop coil TCL1 and the loop coil TCL2 are stacked. Then, as shown in FIGS. 6 to 8, on each of the upper, lower, left, and right sides, the copper thin film wire forming the power transmission loop coil TL (the loop coil TCL1 and the loop coil TCL2) and the power transmission open coil TO (the coil CL1 and the coil CL2) ) Are stacked so that the copper thin film wires constituting the respective layers overlap.

  Next, the stacked state of the power transmission loop coil TL and the power transmission open coil TO, the connection state of the loop coil TCL1 and the loop coil TCL2, and the connection state of the coil CL1 and the coil CL2 are shown in FIGS. FIG. 9 is a cross-sectional view taken along the line AA ′ shown in FIG.

  As shown in FIG. 9, on the left side in FIGS. 2 to 8, first, a loop coil TCL1 and a loop coil TCL2 are laminated with a film BF1 interposed therebetween, and each is electrically connected by a via V1. . At the position of the via V1, the loop coil TCL1 and the loop coil TCL2 wound in the same direction are connected across the film BF1. On the other hand, the coil CL1 and the coil CL2 of the power transmission open coil TO are laminated with the film BF3 interposed therebetween, and are electrically connected to each other by the via V2. At the position of the via V2, the above-described counterclockwise winding of the coil CL1 is turned back (turned back) to form the above-described clockwise winding of the coil CL2. On the other hand, the power transmission open coil TO including the coil CL1 and the coil CL2 and the power transmission loop coil TL including the loop coil TCL1 and the loop coil TCL2 are stacked with the film BF2 interposed therebetween. At this time, the power transmission loop coil TL and the power transmission open coil TO are insulated by the film BF2.

(Iii) Manufacturing method of power transmitting coil TC and power receiving coil RC Next, a method of manufacturing the power transmitting coil TC and the power receiving coil RC of the first embodiment will be described.

As the manufacturing method, a first manufacturing method including the following steps (a) -1 to (a) -12, or the following (b) -1 to (b) -14, which is basically the same as the conventional method. The second manufacturing method including the above steps can be used. In addition, since the manufacturing method of the power transmission coil TC and the manufacturing method of the power receiving coil RC are basically the same, the following description will each explain the manufacturing method of the power transmission coil TC.
(A) First manufacturing method (a) -1: A copper thin film is formed on both surfaces of the film BF1.
(A) -2: A resist is applied on each of the copper thin films (both surfaces) formed in (a) -1.
(A) -3: The resist applied in (a) -2 is patterned on the copper thin film wires of the loop coil TCL1 and the loop coil TCL2 on each surface.
(A) -4: After the patterning of (a) -3, an etching process is performed to form a copper thin film wire as the loop coil TCL1 and the loop coil TCL2.
(A) -5: The via V1 is formed to be the power transmission loop coil TL.
(A) -6: A copper thin film is formed on both surfaces of the film BF3.
(A) -7: A resist is applied on each of the copper thin films (both surfaces) formed in (a) -6.
(A) -8: The resist applied in (a) -7 is patterned on the copper thin film wires of the coil CL1 and the coil CL2 on each surface.
(A) -9: After the patterning of (a) -8, an etching process is performed to form a copper thin film wire as the coil CL1 and the coil CL2.
(A) -10: The via V2 is formed to be the power transmission open coil TO.
(A) -11: The power transmission loop coil TL of (a) -5 and the power transmission open coil TO of (a) -10 are attached to each other with the film BF2 interposed therebetween to form the power transmission coil TC. .
(A) -12: The connection terminals O1 and O2 are connected to the power transmission unit TR.
(B) Second production method (b) -1: A copper thin film is formed on both surfaces of the film BF1.
(B) -2: A through hole is formed by a laser or the like at a position corresponding to the via V1.
(B) -3: The whole including the through-hole is subjected to a copper plating process by an electroless copper plating method and an electrolytic copper plating method to form a via V1.
(B) -4: A resist is applied on each of the copper plating (both surfaces) formed in (b) -3.
(B) -5: The resist applied in (b) -4 is patterned on the copper thin film wires of the loop coil TCL1 and the loop coil TCL2.
(B) -6: After the patterning of the above (b) -5, an etching process is performed to form a copper thin film wire as the loop coil TCL1 and the loop coil TCL2 to form the power transmission loop coil TL.
(B) -7: A copper thin film is formed on both surfaces of the film BF3.
(B) -8: A through hole is formed at a position corresponding to the via V2 by a laser or the like.
(B) -9: The whole including the through holes is subjected to a copper plating process by an electroless copper plating method and an electrolytic copper plating method to form a via V2.
(B) -10: A resist is applied on the copper plating (both sides) formed in (b) -9.
(B) -11: The resist applied in (b) -10 is patterned on the copper thin film wires of the coil CL1 and the coil CL2.
(B) -12: After the patterning of the above (b) -11, an etching process is performed to form a copper thin film wire as the coil CL1 and the coil CL2 to form the power transmission open coil TO.
(B) -13: The power transmission loop coil TL of (b) -6 and the power transmission open coil TO of (b) -12 are bonded together with the film BF2 interposed therebetween to form the power transmission coil TC.
(B) -14: The connection terminals O1 and O2 are connected to the power transmission unit TR.

(Iv) Effects of the power transmission system of the first embodiment Next, a case where power transmission is performed using the power transmission system S of the first embodiment including the power transmission coil TC and the power reception coil RC of the first embodiment. Effects will be described with reference to FIG. 10 based on experimental results (simulation results) by the inventor of the present application. FIG. 10 is a graph showing the relationship between reflection / transmission efficiency and frequency as an effect of the structure of the coil of the first embodiment. Further, in the following description, a simulation result of the effect when the power transmission is performed using the power transmission system S of the first embodiment is described as a simulation of the effect when the power transmission is performed using the power transmission system of the related art. This will be described in comparison with the results. Here, as the above-mentioned conventional example, a loop coil having a square shape with one side of 100 millimeters and a single turn (one turn) winding structure, and a coil of 100 millimeters per side which is arranged coaxially with the center axis of the loop coil and is the same as the loop coil. An open coil including a coil having a ten-turn and half-turn (10.5 turn) winding structure and a two-turn and half-turn (2.5 turn) winding structure in a square shape (that is, the power transmission open coil TO of the first embodiment or (An open coil having the same structure as the power receiving open coil RO), and a power transmission system including a power transmitting coil and a power receiving coil.

  In FIG. 10, the relationship between the S parameter (S11) indicating the reflectance and the frequency is indicated by a mark (first embodiment) and a mark (conventional example), and the S parameter (S21) indicating the power transmission efficiency. As shown by a mark (first embodiment) and a mark ● (conventional example) with respect to the frequency, the power transmission system S of the first embodiment including the power transmission coil TC and the power reception coil RC of the first embodiment is used. In this case, the power transmission efficiency (S-parameter S21) is remarkably improved and the reflectance (S-parameter S11) is also remarkably reduced at a frequency (about 1.65 MHz) that is a resonance frequency. You can see that.

  As described above, according to the power transmission using the power transmission system S of the first embodiment including the power transmission coil TC and the power reception coil RC of the first embodiment, the power transmission open coil TO (or the power reception open coil RO) is used. A power transmission loop coil TL (or a power reception loop coil RL) concentrically laminated is wound around a loop coil TCL1 from the outer circumference to an inner circumference, and a loop wound from the inner circumference to the outer circumference. And the coil TCL2 is connected in series, and both ends in the series connection are the connection terminal O1 and the connection terminal O2 at the outermost periphery of the power transmission coil TC (or the power reception coil RC). The power transmission efficiency of the power transmission coil TC (or the power reception coil RC) as a whole can be improved to further optimize the power transmission efficiency.

  Further, since each copper thin film wire is wound such that the center of winding of the loop coil TCL1 and the center of winding of the loop coil TCL2 match, transmission efficiency can be improved.

  Furthermore, since the layer on which the loop coil TCL1 is formed and the layer on which the loop coil TCL2 is formed are laminated with the insulating film BF1 interposed therebetween, the power transmitting coil TC (or the power receiving coil RC) as a whole is Power transmission efficiency can be further optimized.

  Furthermore, the position of the power transmitting loop coil TL (or the power receiving loop coil RL) in the radial direction of the power transmitting coil TC (or the power receiving coil RC) corresponds to the position of the power transmitting open coil TO (or the power receiving open coil RO) in the radial direction. The position in the radial direction of the power transmitting coil TC (or the power receiving coil) of the copper thin film wire wound on the outermost periphery of the power transmitting loop coil TL (or the power receiving loop coil RL) is the power transmitting open coil TO (or the power receiving open coil). RO), the position corresponding to the position in the radial direction of the copper thin film wire wound on the outermost periphery, and the position of the copper thin film wire wound on the innermost periphery in the power transmission loop coil TL (or the power reception loop coil RL). The radial position of the power transmission coil TC (or the power reception coil) is the power transmission open coil TO (or the power reception open coil). RO), the position corresponds to the position in the radial direction of the copper thin film wire wound on the innermost circumference, and consequently, the outermost circumference of the power transmission loop coil TL (or the power reception loop coil RL). The wound copper thin film wire and the innermost wound copper thin film wire are separated by a distance w (see FIG. 2), and the power transmission efficiency can be effectively optimized.

  Further, the power transmission open coil TO (or the power reception open coil RO) is configured by laminating a coil CL1 and a coil CL2 each formed by a plurality of copper thin film wires wound concentrically with an insulating film BF3 interposed therebetween. Therefore, the transmission efficiency and the reflectance of the power as the power transmission coil TC (or the power reception coil RC) can be improved.

(II) Second Embodiment Next, the configuration of a second embodiment, which is another embodiment of the present invention, will be described with reference to FIGS.

  The power transmission system according to the second embodiment described below is different from the power transmission system S according to the first embodiment only in the configuration of the power transmission open coil and the power reception open coil according to the second embodiment. Is the same as in the power transmission system S of the first embodiment. Therefore, in the following description, only the part having the different configuration will be described, and the description of the other similar configuration and the manufacturing method will be omitted. Further, similarly to the power transmission system S of the first embodiment, the configuration of the power transmission open coil of the second embodiment and the configuration of the power reception open coil of the second embodiment are basically the same. Therefore, in the following description, the structure of the power transmission open coil of the second embodiment will be described. 11 to 14 are plan views showing the structure of the power transmission open coil of the second embodiment. In the power transmission device of the second embodiment, the power transmission coil of the second embodiment is viewed from the power transmission unit side of the second embodiment. It is a top view when seeing. At this time, in FIGS. 11 to 14, the same components as those of the power transmission system S of the first embodiment are denoted by the same reference numerals.

  The power transmission coil of the second embodiment has a configuration similar to that of the power transmission loop coil TL of the first embodiment, and a power transmission loop coil of the second embodiment, and a second configuration of each of which is described with reference to FIGS. The power transmission open coil of the second embodiment including the coil CL21 and the coil CL22 of the embodiment is the same insulating film as the power transmission coil TC of the first embodiment (not shown in FIGS. 11 to 14). 11 to 14 in the direction of the paper surface of FIG. Further, the power transmission open coil according to the second embodiment is configured such that the two coils CL21 and CL22 are stacked in the paper direction of FIGS. 11 to 14 via the insulating film. In the second embodiment, an insulating material such as a glass epoxy material or a thin film material in which ceramic particles or the like are dispersed may be used for insulation in addition to the above films. Furthermore, the centers of the windings of the copper thin film wires constituting the power transmission loop coil and the coils CL21 and CL22 of the second embodiment are the same or substantially the same.

  Next, the configuration of a coil CL21 that is laminated immediately below the power transmission loop coil of the second embodiment via the film and that constitutes the power transmission open coil of the second embodiment will be described with reference to FIG. FIG. 11 is a plan view showing only the coil CL21. In FIG. 11, a part of the winding of the copper thin film wire forming the coil CL21 is omitted for clarification of the drawing.

  As shown in FIG. 11, a coil CL <b> 21 configuring the power transmission open coil of the second embodiment has an outermost end portion as an open end T <b> 1. In the coil CL21, for example, a copper thin film wire is spirally wound 17 times and a half (17.5 turns) from the outermost peripheral portion to the innermost peripheral portion in a counterclockwise direction starting from the open end T1. It is configured. In addition, a via V2 for forming an electrical connection with the coil CL22 stacked immediately below in the direction of the paper surface of FIG. 11 is connected to the innermost peripheral portion. The copper thin film wire forming the coil CL21 has the same thickness over the entire circumference of the coil CL21, but the width is formed so as to become wider as the coil CL21 is located inside. Further, in the coil CL21, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. 11, respectively, and the respective straight parts are respectively connected by substantially concentric arc-shaped curved parts. I have. Then, the width of the copper thin film wire forming the coil CL21 is formed to be constant in the above-mentioned straight line portion and to become thicker in the above-mentioned curved portion as it goes inside the coil CL21.

  Next, the configuration of the coil CL22 that is stacked immediately below the coil CL21 via the film will be described with reference to FIG. FIG. 12 is a plan view showing only the coil CL22. In FIG. 12, for the sake of clarity of the drawing, a part of the winding of the copper thin film wire forming the coil CL22 is omitted.

  As shown in FIG. 12, the coil CL22 that constitutes the power transmission open coil of the second embodiment together with the coil CL21 has the via V2 for forming an electrical connection with the coil CL21 at the innermost periphery thereof. It is connected. That is, the connection between the coil CL21 and the coil CL22 is a series connection. Then, the coil CL22 is rotated clockwise starting from the via V2 (that is, in the direction opposite to the coil CL21) from the innermost portion to the outermost portion, for example, by a three-and-a-half turn of a copper thin film wire in a spiral shape. (3.5 turns). The outermost end is an open end T2. The copper thin film wire forming the coil CL22 has the same thickness over the entire circumference of the coil CL22, but the width thereof is formed so as to become thinner toward the outside of the coil CL22. Further, in the coil CL22, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. 12, and the respective straight parts are respectively connected by substantially concentric arc-shaped curved parts. I have. Then, the width of the copper thin film wire forming the coil CL22 is made constant at the straight portion, and is formed so as to become thinner toward the outside of the coil CL22 at the curved portion.

  Here, as the positional relationship between the copper thin film wires constituting the coil CL21 and the coil CL22, respectively, the number of turns is seventeen and a half turns (17.5 turns) and three and a half turns (3.5 turns). Although different, the position of the copper thin film wire of the coil CL21 wound in the counterclockwise direction and the position of the copper thin film wire of the coil CL22 wound in the clockwise direction are the coil CL21 and the coil CL21. Each of the copper thin film wires is wound so as to coincide with each other when viewed from the center of each of the turns of the CL 22. The coil CL21 and the coil CL22 are connected in series by the via V2 connected to the innermost peripheral portion. Thereby, the coil CL22 is wound from the innermost peripheral portion to the outermost peripheral portion by turning (turning) the winding from the outermost peripheral portion to the innermost peripheral portion in the opposite direction at the innermost peripheral portion. Will be. Therefore, as a result, as shown in FIGS. 11 and 12, the width of the copper thin film line forming the coil CL21 is smaller than the width of the copper thin film line forming the coil CL22.

  Next, the positional relationship between the copper thin film wires constituting the power transmission loop coil of the second embodiment and the power transmission open coil (that is, the coil CL21 and the coil CL22) of the second embodiment will be described with reference to FIGS. Will be explained.

  First, the positional relationship between the copper thin film wires constituting the loop coil TCL2 of the power transmission loop coil of the second embodiment and the coil CL21 of the power transmission open coil of the second embodiment will be described with reference to FIG. FIG. 13 is a plan view showing the overlapping state of the loop coil TCL2 and the coil CL21. The loop coil TCL2 is indicated by a solid line, and an insulating film (not shown in FIG. 13) is provided directly below the loop coil TCL2. The stacked coils CL21 are indicated by broken lines.

  As shown by a broken line in FIG. 13, a copper thin film wire is wound seventeen turns and a half (17.5 turns) from the outer periphery to the inner periphery, and the coil CL22 (shown in FIG. The coil CL21 is connected to the coil CL21 so that the position of the linear portion is shifted toward the inner periphery by one-fourth of the pitch in the winding of the copper thin film wire every quarter turn. A curved portion is formed and the copper thin film wire is wound. On the other hand, as shown by the solid line in FIG. 13, the copper thin film wire constituting the loop coil TCL2 is laminated near the outer edge and the inner edge of the coil CL21 along the outer edge and the inner edge, respectively. Thus, in the power transmission coil according to the second embodiment in which the loop coil TCL2 and the coil CL21 are stacked, as shown in FIG. 13, the copper thin film wires forming the loop coil TCL2 and the coil CL21 on the upper, lower, left, and right sides, respectively. Are stacked so as to overlap.

  Next, the positional relationship between the copper thin film wires constituting the coil CL21 and the coil CL22 of the power transmission open coil according to the second embodiment will be described with reference to FIG. FIG. 14 is a plan view showing the state of overlap between the coil CL21 and the coil CL22. The coil CL21 is stacked with a solid line via an insulating film (not shown in FIG. 14). The indicated coils CL22 are indicated by broken lines.

  As shown by the broken line in FIG. 14, the coil CL22 is wound three turns and a half (3.5 turns) from the inner circumference to the outer circumference, and connected to the coil CL21 by the via V2 at the innermost circumference. In each of the quarter rounds, each curved portion is formed and the copper thin film wire is wound so that the position of the straight line portion is shifted toward the outer peripheral side by one quarter of the pitch in the winding of the copper thin film wire. The outermost end is an open end T2. On the other hand, as shown by the solid line in FIG. 14, the copper thin film wires forming the coil CL21 are laminated along the vicinity of the outer edge and the inner edge of the coil CL22, respectively, and the outermost end thereof is an open end T1. . Thus, the second embodiment in which the power transmission open coil of the second embodiment configured by laminating the coil CL21 and the coil CL22 and the power transmission loop coil of the second embodiment including the loop coil TCL2 are laminated. In the power transmission coil of the embodiment, as shown in FIGS. 13 and 14, the copper thin film wire forming the power transmission loop coil of the second embodiment and the copper thin film forming each of the coil CL21 and the coil CL22 are disposed on the upper, lower, left, and right sides. The lines are stacked so as to overlap.

  The effect of the configuration of the power system according to the second embodiment will be described later with reference to FIG.

(III) Third to Sixth Embodiments Next, configurations of third to sixth embodiments, which are still other embodiments of the present invention, will be described with reference to FIGS. 15 to 18, respectively.

  The power transmission system according to the third to sixth embodiments described below is different from the power transmission system according to the second embodiment in the power transmission loop coil and the power reception loop coil according to the third embodiment to the sixth embodiment. Only the configuration of the second embodiment is different from that of the power transmission system according to the second embodiment. Therefore, in the following description, only the configuration of the power transmission loop coil and the power reception loop coil of each embodiment having a different configuration will be described, and other configurations including the power transmission open coil and the power reception open coil and the manufacturing method will be described. Is omitted. Further, similarly to the power transmission system of the second embodiment, the configuration of the power transmission open coil of the third to sixth embodiments and the configuration of the power reception open coil of the third to sixth embodiments are basically the same. Are identical. Therefore, in the following description, each configuration of the power transmission loop coil of each of the third to sixth embodiments will be described.

  15 is a plan view showing the structure of the coil according to the third embodiment, FIG. 16 is a plan view showing the structure of the coil according to the fourth embodiment, and FIG. 17 is a plan view showing the structure of the coil according to the fifth embodiment. FIG. 18 is a plan view showing the structure of the coil according to the sixth embodiment. 15 to 18 are plan views of the power transmission system of each of the third to sixth embodiments when viewed from the power transmission unit side of the power transmission coil of each embodiment. At this time, in FIGS. 15 to 18, the same components as those of the power transmission system of the second embodiment are denoted by the same reference numerals.

  The effects of the configuration of the power system according to the third to sixth embodiments will be collectively described later with reference to FIG.

(I) Regarding the power transmission loop coil of the third embodiment First, the configuration of the power transmission loop coil of the third embodiment will be described with reference to FIG.

  The power transmission coil of the third embodiment has a power transmission loop coil TL3 of the third embodiment whose plan view is shown in FIG. 15 and a power transmission open coil of the second embodiment (see FIGS. 11 to 14; the same applies hereinafter). A power transmission open coil (not shown in FIG. 15) of the third embodiment having a similar configuration is laminated in the paper direction of FIG. 15 via an insulating film not shown in FIG. It is composed. The power transmission loop coil TL3 has a loop coil TCL31 whose planar shape is indicated by a solid line in FIG. 15 and a loop coil TCL32 whose planar shape is indicated by a broken line in FIG. Are laminated in the direction of the paper surface of FIG. In the third embodiment, in addition to the film, an insulating material such as a glass epoxy material can be used between the respective layers. For example, a thin film material in which the ceramic particles and the like are dispersed is used for insulation. You can also. Furthermore, the center of winding of the copper thin film wire forming each of the loop coil TCL31 and the loop coil TCL32 and the center of winding of the copper thin film wire forming the power transmission open coil of the third embodiment are the same or substantially the same. It has been.

  In the above configuration, the loop coil TCL31 of the power transmission loop coil TL3 has the same configuration as the loop coil TCL1 of the first embodiment or the second embodiment as shown in FIG. A structure in which a copper thin film wire O1 is wound one turn and a half (1.5 turns) in a counterclockwise direction including a straight portion and a curved portion, and a via V1 is connected to the innermost portion thereof. Similarly). As shown in FIG. 15, the loop coil TCL32 of the power transmission loop coil TL3 has the same configuration as the loop coil TCL2 of the first or second embodiment (that is, the loop coil TCL32 is opposite to the innermost peripheral portion connected to the via V1). A structure in which a copper thin film wire is wound clockwise one and a half turns (1.5 turns) including a straight line portion and a curved portion, and the outermost end is a connection terminal O2. Have. The loop coil TCL31 and the loop coil TCL32 are stacked via the film, and their innermost peripheral portions are connected via vias V1. That is, the loop coil TCL31 and the loop coil TCL32 wound in the same winding direction in different stacked layers are connected in series via the via V1.

  On the other hand, as shown in FIG. 15, in the power transmission loop coil TL3 of the third embodiment, the copper thin film wire forming the loop coil TCL31 and the copper thin film wire forming the loop coil TCL32 are, for example, 0 in plan view. Wound in different layers so as to be closely spaced at about 0.6 mm. At this time, as shown in FIG. 15, a part of the copper thin film wire forming the loop coil TCL31 and a part of the copper thin film wire forming the loop coil TCL31 (for example, each upper side portion) overlap each other in plan view. It is wound.

(Ii) Power Transmission Loop Coil of Fourth Embodiment Next, the configuration of the power transmission loop coil of the fourth embodiment will be described with reference to FIG.

  The power transmission coil of the fourth embodiment has a configuration similar to that of the power transmission open coil of the fourth embodiment, and a power transmission loop coil TL4 of the fourth embodiment whose plan view is shown in FIG. (Illustration is omitted in FIG. 16) is laminated in the direction of the paper surface of FIG. 16 via an insulating film not illustrated in FIG. The power transmission loop coil TL4 has a loop coil TCL41 whose plane shape is shown by a solid line in FIG. 16 and a loop coil TCL42 whose plane shape is shown by a broken line in FIG. Are laminated in the direction of the paper surface of FIG. In the fourth embodiment, in addition to the film, an insulating material such as a glass epoxy material can be used between the respective layers. For example, a thinned material in which the ceramic particles or the like are dispersed is used for insulation. You can also. Further, the center of the winding of the copper thin film wire constituting each of the loop coil TCL41 and the loop coil TCL42 and the center of the winding of the copper thin film wire constituting the power transmission open coil of the fourth embodiment are the same or substantially the same. It has been.

  In the above configuration, the loop coil TCL41 of the power transmission loop coil TL4 has the same configuration as the loop coil TCL1 of the first or second embodiment as shown in FIG. Further, the loop coil TCL42 of the power transmission loop coil TL4 has the same configuration as the loop coil TCL2 of the first embodiment or the second embodiment as shown in FIG. The loop coil TCL41 and the loop coil TCL42 are stacked via the film, and their innermost peripheral portions are connected via a via V1. That is, the loop coil TCL41 and the loop coil TCL42, which are wound in the same winding direction in different stacked layers, are connected in series via the via V1.

  On the other hand, as shown in FIG. 16, in the power transmission loop coil TL4 of the fourth embodiment, a portion where the copper thin film wire forming the loop coil TCL41 and the copper thin film wire forming the loop coil TCL42 intersect is excluded. So that they do not overlap in plan view. Here, in the loop coil TCL1 and the loop coil TCL2 of the first embodiment, the respective copper thin film wires are wound so that some sides thereof are overlapped in a plan view (see FIG. 6). The point that there is no such overlap is a configuration unique to the loop coil TCL41 and the loop coil TCL42 of the fourth embodiment.

(Iii) Regarding the power transmission loop coil of the fifth embodiment Next, the configuration of the power transmission loop coil of the fifth embodiment will be described with reference to FIG.

  The power transmission coil according to the fifth embodiment has a configuration similar to that of the power transmission open coil according to the fifth embodiment and a power transmission loop coil TL5 according to the fifth embodiment whose plan view is illustrated in FIG. 17. (Not shown in FIG. 17) is laminated in the direction of the paper surface of FIG. 17 via an insulating film not shown in FIG. The power transmission loop coil TL5 includes a loop coil TCL1 of the first embodiment whose planar shape is shown by a solid line in FIG. 17 and a loop coil TCL52 whose planar shape is shown by a broken line in FIG. It is configured by being laminated in the direction of the paper surface of FIG. In the fifth embodiment, in addition to the film, an insulating material such as a glass epoxy material may be used between the respective layers. For example, a thinned material in which the ceramic particles or the like are dispersed is used for insulation. You can also. Furthermore, the center of the winding of the copper thin film wire forming each of the loop coil TCL1 and the loop coil TCL52 and the center of the winding of the copper thin film wire forming the power transmission open coil of the fifth embodiment are the same or substantially the same. It has been.

  In the above configuration, the loop coil TCL52 of the power transmission loop coil TL5 is, as shown in FIG. The structure is such that the copper thin film wire including the portion and the curved portion is wound by a half turn (0.5 turn), and the outermost end thereof is used as the connection terminal O2. On the other hand, as described above, in the loop coil TCL1, the copper thin film wire whose outermost end is the connection terminal O1 is rotated one and a half times in the counterclockwise direction (1. 5 turns) and the via V1 is connected to the innermost periphery of the winding. The loop coil TCL1 and the loop coil TCL52 are stacked via the film, and their innermost peripheral portions are connected via vias V1. That is, the loop coil TCL1 and the loop coil TCL52 wound in the same winding direction in different stacked layers are connected in series via the via V1.

  On the other hand, as shown in FIG. 17, in the power transmission loop coil TL5 of the fifth embodiment, a portion where the copper thin film wire forming the loop coil TCL1 and the copper thin film wire forming the loop coil TCL52 intersect is excluded. So that they do not overlap in plan view.

(Iv) Regarding the power transmission loop coil of the sixth embodiment Finally, the configuration of the power transmission loop coil of the sixth embodiment will be described with reference to FIG.

  The power transmission coil according to the sixth embodiment has a configuration similar to that of the power transmission open coil according to the sixth embodiment, and a power transmission loop coil TL6 according to the sixth embodiment whose plan view is illustrated in FIG. 18. (Not shown in FIG. 18) are laminated in the paper direction of FIG. 18 via an insulating film not shown in FIG. The power transmission loop coil TL6 includes a loop coil TCL61 whose planar shape is indicated by a solid line in FIG. 18 and a loop coil TCL62 whose planar shape is indicated by a broken line in FIG. Are stacked in the direction of the paper surface of FIG. In the sixth embodiment, in addition to the film, an insulating material such as a glass epoxy material may be used between the respective layers. For example, a thin film material in which the ceramic particles or the like are dispersed is used for insulation. You can also. Furthermore, the center of the winding of the copper thin film wire forming each of the loop coil TCL61 and the loop coil TCL62 and the center of the winding of the copper thin film wire forming the power transmission open coil of the sixth embodiment are the same or substantially the same. It has been.

  In the above configuration, as shown in FIG. 18, the loop coil TCL61 of the power transmission loop coil TL6 is such that the copper thin film wire whose outermost peripheral portion is the connection terminal O1 has a counterclockwise shape including a straight portion and a curved portion. The winding is wound twice (2 turns) in the direction, and the via V1 is connected to the innermost portion (on the side closer to the connection terminal O1). As shown in FIG. 18, the loop coil TCL62 of the power transmission loop coil TL6 is arranged in a counterclockwise direction from the innermost periphery (on the side closer to the connection terminal O2 described below) connected to the via V1. The copper thin film wire is wound two turns (two turns) including a straight portion and a curved portion, and the outermost end is a connection terminal O2 adjacent to the connection terminal O1. The loop coil TCL61 and the loop coil TCL62 are stacked via the film, and their innermost peripheral portions are connected via vias V1. That is, the loop coil TCL61 and the loop coil TCL62 wound in the same winding direction in different stacked layers are connected in series via the via V1.

  On the other hand, as shown in FIG. 18, in the power transmission loop coil TL6 of the sixth embodiment, a copper thin film wire forming the loop coil TCL61 and a copper thin film wire forming the loop coil TCL62 are partially (FIG. 18, the copper thin film wires are wound so as to overlap each other in plan view on the right side and the left side.

(IV) Effects of Power Transmission Systems of Third to Sixth Embodiments Next, power transmission is performed using the power transmission systems of the respective embodiments including the power transmission loop coils of the third to sixth embodiments. The effect obtained by performing the above will be described with reference to FIG. 19 and the following table, based on experimental results (simulation results) by the inventor of the present application. FIG. 19 is a graph showing the relationship between reflection / transmission efficiency and frequency as an effect of the coil structure of each of the second to sixth embodiments. In the following description, simulation results of effects obtained when power transmission is performed using the power transmission system of each embodiment will be described while being compared with each other.

At this time, the first transmission efficiency shown in Table 1 is based on the power to be transmitted from the power transmission unit TR to the power transmission coil TC, the power received by the power reception coil RC and output to the power reception unit RV, Is the ratio of On the other hand, the second transmission efficiency is obtained by subtracting the power reflected by the power transmission unit TR from the power to be transmitted input from the power transmission unit TR to the power transmission coil TC, and the power received by the power reception coil RC and output to the power reception unit RV. And the power applied.

  Here, the first transmission efficiency and the second transmission efficiency will be described more specifically using the case of the second embodiment shown in FIG. That is, in the experimental results of the second embodiment illustrated in FIG. 19, the value of the S parameter (S11) indicating the reflectance of the power output from the power transmission unit TR is “−11.7”. Thus, it can be understood that about 6.8% of the power output from the power transmission unit TR is not input to the power transmission coil TC and is reflected by the power transmission unit TR. At this time, in the first transmission efficiency, the reflection is not considered, and in the case of the second embodiment, the value of the S parameter (S21) indicating the transmission efficiency of the power is "-1.1". Therefore, the first transmission efficiency, which is the ratio of the power to be transmitted to the power transmission coil TC to the power to be transmitted to the power receiving unit RV, is 77.6%. On the other hand, regarding the second transmission efficiency, since the reflection of 6.8% returns to the power transmission unit TR, the power input to the power transmission coil TC is 93.2% of the power output from the power transmission unit TR. As a result, the second transmission efficiency between the power transmitting coil TC and the power receiving coil RC is 77.6 / 93.2 ≒ 83.2%.

  In FIG. 19, the relationship between the frequency and the S parameter (S11) indicating the reflectivity of the power is indicated by a mark (second embodiment), a mark (third embodiment), and a mark (fourth embodiment). , The relationship between the S parameter (S21) indicating the power transmission efficiency and the frequency is indicated by a mark (second embodiment), a mark (third embodiment), and a mark (fourth embodiment). As shown in FIG. 6, when the power transmission loop coil TL of the second embodiment having the same configuration as the power transmission loop coil TL of the first embodiment (see FIG. 6) is used and when the power transmission loop coil TL4 of the fourth embodiment is used. The second transmission efficiency is as high as 83% (in the case of the second embodiment) and 82% (in the case of the fourth embodiment), respectively, whereas the second transmission efficiency is high when the power transmission loop coil TL3 of the third embodiment is used. 2 transmission effect There has been a 76 percent. Accordingly, in general, the larger the radial distance (for example, the distance w shown in FIG. 2) between the power transmitting coil (or the power receiving coil) of the two copper thin film wires constituting the power transmitting loop coil (or the power receiving loop coil), the higher the transmission efficiency It turns out that it goes up. On the other hand, at least a part of each of the copper thin film wires overlaps when the power transmission loop coil (or the power reception loop coil) is viewed in a plan view (see the second embodiment), and when it does not overlap ( It can be seen that there is no effect on the transmission efficiency.

  On the other hand, when the second to fourth embodiments are compared with the fifth embodiment, the second transmission efficiency is lower in the fifth embodiment. This indicates that the transmission efficiency of the two copper thin film wires constituting the power transmission loop coil (or the power reception loop coil) is increased with the same number of turns in terms of the transmission efficiency.

  Furthermore, in the case of the sixth embodiment, the second transmission efficiency is the highest at 94%, and as a result, the number of turns of each of the two copper thin film wires constituting the power transmission loop coil (or the power reception loop coil) is two turns ( It can be seen that transmission efficiency is higher in (2 turns). Here, in the case of the sixth embodiment, the first transmission efficiency is lower than, for example, the second and fifth embodiments, but this point is due to the adjustment of the impedance of each power transmission loop coil (or each power reception open coil). It is possible to increase the first transmission efficiency. Regarding the number of turns of the two copper thin film wires constituting the power transmission loop coil (or the power receiving loop coil), according to another experimental result by the inventor of the present application, each of the turns was two and a half turns (2.5 turns). , High transmission efficiency is obtained. On the other hand, when the number of turns is four and a half (4.5 turns), the first transmission efficiency becomes 33% and the second transmission efficiency becomes 75% when the resonance frequency is 1.5 MHz. Was. Further, when the width of each of the two copper thin film wires constituting the power transmission loop coil (or the power receiving loop coil) is increased and the interval between the adjacent copper thin film wires in each winding is reduced, the resonance frequency becomes 1. At 0 MHz, the first transmission efficiency was 5% and the second transmission efficiency was 46%. According to these, it has been found that the transmission efficiency is reduced even if the number of turns is excessively increased, and the transmission efficiency is further reduced if the interval between the copper thin film wires is reduced.

  From the above experimental results, the number of turns of the two copper thin film wires constituting the power transmission loop coil (or the power receiving loop coil) is the same, and is equal to or more than one and a half (1.5 turns) and three or more turns (3 turns). Turn) is the optimal value.

  As described above, according to the power transmission systems of the second to sixth embodiments, the number of turns of two copper thin film wires constituting the power transmission loop coil (or the power reception loop coil) is increased by one and a half (1 rotation). .5 turns) or more and three turns (3 turns) can effectively optimize the power transmission efficiency.

  In each of the above-described embodiments, the loop coils constituting the power transmission loop coil (or the power reception loop coil) are stacked with an insulating film interposed therebetween. In addition, each loop coil may be a jumper wire or the like. May be wound in one layer while being insulated from each other. In this case, it is possible to achieve both optimization of the power transmission efficiency of the entire power transmission coil (or the power reception coil) and miniaturization thereof.

  In each of the above-described embodiments, the open ends of the outermost peripheral portions of the respective coils constituting the power transmission open coil (or the power receiving open coil) are at the same position in the winding, and the respective innermost peripheral portions are also in the winding. Although configured to be at the same position, in addition to this, one or both of the position of the open end and the position of the innermost peripheral portion may be formed at different positions.

  Furthermore, even if the layers on which the coils constituting the power transmission loop coil (or the power reception loop coil) and the power transmission open coil (or the power reception open coil) in each of the above-described embodiments are formed are exchanged (that is, the power transmission unit or the power reception coil). (Even if the positions (orders) of the coils as viewed from the part are interchanged), the same effect as in each embodiment can be obtained.

  Furthermore, in each of the above-described embodiments, a power transmission loop coil or a power reception loop coil, or an end of a power transmission open coil or a power reception open coil which is an open end, further connecting a capacitor in series or in parallel. By adjusting the parasitic capacitance as the power transmission loop coil or the power reception loop coil, or the power transmission open coil or the power reception open coil, the resonance frequency may be reduced. At this time, when a capacitor is connected in series to one of the open ends of the power transmitting open coil and the power receiving open coil, the terminal of the capacitor not connected to any of the open ends may be set as the open end. .

(V) Modification Next, a modification of the present invention will be described. The configuration of the power transmission system S of each embodiment described above may be modified as shown in the following (A) to (G). The inventor of the present invention has confirmed that the same effects as those of the power transmission system S can be obtained even when the respective modifications are added.

(A) As a first variant first of variation, for example, in the power transmission open coil TO (or receiving an open coil RO) of the first embodiment, the coil CL1 and the coil CL2 respective windings constituting each ten half turns (10.5 turns) and two and a half turns (2.5 turns), but other than these, the number of turns of the coil CL1 and the coil CL2 may be different from the above, or the number of turns of the coil CL1 and the number of turns of the coil CL2 may be different. May be the same as the number of turns.

(B) Second Modification Next, as a second modification, in the power transmission open coil TO (or power reception open coil RO) of each embodiment, for example, the power transmission loop coil TL (or power reception loop coil RL) and the coil CL1 are different. Although formed in the layers, they may be formed in the same layer, and the power transmission loop coil TL (or the power reception loop coil RL) and the coil CL1 may be concentrically laminated.

(C) Third Modification Next, as a third modification, the coil CL1 (or the coil CL21) and the coil CL2 (or the coil CL22) of each embodiment are connected to each other by the via V2 at the innermost periphery. However, other than these, the coil CL1 (or the coil CL21) and the coil CL2 (or the coil CL22) may be insulated from each other.

(D) Fourth Modification Next, as a fourth modification, for example, the order of the coil CL1 and the coil CL2 of the first embodiment viewed from the power transmission loop coil TL (or the power reception loop coil RL) of the first embodiment will be described. They may be interchanged.

(E) Fifth Modification Next, as a fifth modification, for example, the position of the power transmission loop coil TL and the position of the power transmission open coil TO in the power transmission coil TC of the first embodiment are exchanged, and the power reception of the first embodiment is performed. The position of the power receiving loop coil RL and the position of the power receiving open coil RO in the coil RC may be exchanged. In the case of the fifth modification, the power transmission loop coil TL of the power transmission coil and the power reception loop coil RL of the power reception coil are arranged to face each other in the entire power transmission system of the fifth modification.

(F) Sixth Modification Next, as a sixth modification, in the coil CL1 (or the coil CL21) and the coil CL2 (or the coil CL22) of each embodiment, the width is increased from the outer circumference to the inner circumference. However, besides these, the widths of the coil CL1 (or the coil CL21) and the coil CL2 (or the coil CL22) may be the same over the entire circumference.

(G) Seventh Modification Finally, as a seventh modification, for example, in the first embodiment, in series or in parallel with the end of the power transmission open coil TO or the power reception open coil TO which is an open end, or power transmission. A capacitor is further connected in parallel with the loop coil TL or the power receiving loop coil RL to adjust the parasitic capacitance of the power transmitting loop coil TO or the power receiving loop coil RO, or the power transmitting open coil TL or the power receiving open coil RL. Thus, the resonance frequency may be reduced. At this time, when a capacitor is connected in series to any open end of the power transmitting open coil TO or the power receiving open coil RO, a terminal of a capacitor not connected to any of the open ends may be set as an open end. Good.

  As described above, the present invention can be used in the field of non-contact power transmission, and is particularly remarkable when applied to the field of power transmission for charging a storage battery mounted on an electric vehicle. The effect is obtained.

S power transmission system T power transmission device R power reception device TR power transmission unit TC power transmission coil RV power reception unit RC power reception coil TL, TL3, TL4, TL5, TL6 power transmission loop coil TO power transmission open coil RO power reception open coil RL power reception loop coil O1, O2 connection Terminals V1, V2 Vias T1, T2 Open end TCL1, TCL2, TCL31, TCL32, TCL41, TCL42, TCL52, TCL61, TCL62 Loop coil CL1, CL2, CL21, CL22 Coil BF1, BF2, BF3 Film

Claims (11)

In a coil pair for non-contact power transmission,
A first coil for transmitting or receiving power,
A second coil to which the power to be transmitted is supplied at the time of power transmission, and the received power is output at the time of power reception, and a second coil concentrically stacked with the first coil;
With
The second coil includes:
Outer and inner windings concentrically wound from the outer periphery to the inner periphery of the second coil;
An inner / outer winding wound concentrically from the inner circumference to the outer circumference of the second coil and in the same winding direction as the outer / inner winding;
Are connected in series,
In the second coil, each of both ends in the series connection is an external connection terminal at an outermost peripheral portion of the second coil. The coil pair according to claim 1,
The outer and inner windings and the inner and outer windings are respectively wound so that the center of the winding of the outer and inner windings in the second coil coincides with the center of the winding of the inner and outer windings. A coil pair, characterized in that: In the coil pair according to claim 1 or 2,
In the second coil, the outer and inner windings and the inner and outer windings are wound in one layer while being insulated from each other. In the coil pair according to claim 1 or 2,
In the second coil, a layer in which the outer and inner windings are formed and a layer in which the inner and outer windings are formed are stacked with an insulating portion interposed therebetween. In the coil pair according to any one of claims 1 to 4,
The position of the second coil in the radial direction of the coil pair is a position corresponding to the position of the first coil in the radial direction,
The position in the radial direction of the winding wound around the outermost circumference in the second coil is a position corresponding to the position in the radial direction of the winding wound around the outermost circumference in the first coil,
The radial position of the winding wound on the innermost circumference of the second coil is a position corresponding to the radial position of the winding wound on the innermost circumference of the first coil. A coil pair. In the coil pair according to any one of claims 1 to 5,
A coil pair, wherein the number of turns of each of the outer and inner windings and the inner and outer windings is one and a half or more and three or less. In the coil pair according to any one of claims 1 to 6,
A coil pair, wherein the first coil is formed by stacking a plurality of windings each concentrically wound with an insulating portion interposed therebetween. In the power transmission device included in a power transmission system configured to include a power transmission device and a power reception device separated from the power transmission device, and to transmit power from the power transmission device to the power reception device in a non-contact manner.
A power transmission coil pair that is the coil pair according to any one of claims 1 to 7,
Output means for outputting power to be transmitted to the power transmission coil pair,
A power transmission device comprising: In the power receiving device included in a power transmission system configured to include a power transmitting device and a power receiving device separated from the power transmitting device, and to transmit power from the power transmitting device to the power receiving device in a non-contact manner.
The power receiving coil pair according to any one of claims 1 to 7, wherein the power receiving coil pair is disposed to face the power transmitting device.
Input means connected to the receiving coil pair,
A power receiving device comprising: A power transmission device according to claim 8,
A power receiving device that is separated from the power transmitting device and disposed to face the power transmitting coil pair, and a power receiving device that receives power transmitted from the power transmitting device;
A non-contact type power transmission system comprising: A power transmission device,
The power receiving device according to claim 9, wherein the power receiving device is separated from the power transmitting device and the power receiving coil pair is arranged to face the power transmitting device, and receives power transmitted from the power transmitting device;
A non-contact type power transmission system comprising: