JP7196436B2 - Coil pair, power transmitting device, power receiving device, and power transmission system - Google Patents

Description

The present invention belongs to the technical field of coil pairs, power transmission devices, power reception devices, and power transmission systems. More specifically, it belongs to the technical field of a coil pair for non-contact power transmission, a non-contact power transmission device, power reception device, and power transmission system using the coil pair.

2. Description of the Related Art In recent years, electric vehicles equipped with a storage battery such as a lithium ion battery have become popular. Since such an electric vehicle moves by driving a motor using electric power stored in a storage battery, efficient charging of the storage battery is required. Therefore, 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 power receiving coil and a power transmitting coil that are separated from each other and facing each other are used, so-called wireless power transmission. Research is being conducted on Methods of wireless power transmission generally include an electric field coupling method, an electromagnetic induction method, a magnetic resonance method, and the like. When these methods are compared in terms of frequency used, horizontal and vertical positional freedom, and transmission efficiency, for example, wireless power transmission methods for charging storage batteries installed in electric vehicles , an electric field coupling method using a capacitor or a magnetic resonance method using a coil is considered promising, and research and development on these methods are being actively carried out. Prior art documents disclosing such background art include, for example, Patent Document 1 below. This patent document 1 discloses a coil that performs power transmission by a magnetic resonance method using a loop coil of one turn (one turn) and an open coil of five and a half turns (5.5 turns). there is

JP 2011-200045 A

However, although Patent Literature 1 describes improving the transmission efficiency of the coil as a whole, it does not mention or consider lowering the resonance frequency of the coil as a whole. Therefore, the technique disclosed in Patent Document 1 does not contribute to lowering the resonance frequency of the coil as a whole. This poses a problem that the length of each coil cannot be shortened in adjusting the resonance frequency, and as a result, power loss and heat generation due to the electrical resistance of each coil cannot be suppressed. .

In addition, lowering the resonance frequency is also required when applying the wireless power transmission system to the laws and regulations of the countries where it is used, but the technology disclosed in the above Patent Document 1 As a result, there is no contribution to the application of the above laws and regulations.

Therefore, the present invention has been made in view of the above problems, and one example of the problem is a coil pair for contactless power transmission capable of lowering the resonance frequency, and the coil pair. An object of the present invention is to provide a contactless power transmitting device, a power receiving device, and a power transmission system using the above.

In order to solve the above problems, the invention according to claim 1 provides a first coil for power transmission or power reception in a coil pair for contactless power transmission, wherein the first coil winding line is wound. and a second coil to which the power to be transmitted is supplied during power transmission and to which the received power is output during power reception, wherein the second coil is laminated concentrically with respect to the first coil. and, the second coil is configured such that the second coil winding line is wound two or more times in one layer concentrically, in the same winding direction, and in the same radial direction in the coil pair. , both ends of the second coil winding line are terminals for external connection, and the position of the second coil in the radial direction of the coil pair corresponds to the position of the first coil in the radial direction. and the position in the radial direction of the second coil winding line wound around the outermost circumference of the second coil is the diameter of the first coil winding line wound around the outermost circumference of the first coil The position in the radial direction of the second coil winding wound on the innermost circumference of the second coil corresponds to the position in the radial direction, and the position in the radial direction is the position on which the second coil is wound on the innermost circumference of the first coil. The position corresponds to the position of the first coil winding line in the radial direction .

According to the first aspect of the present invention, the second coil, which is concentrically laminated with respect to the first coil, is arranged such that the second coil winding lines are arranged concentrically and in the same winding direction and in the same radial direction in the coil pair. Since both ends of the second coil winding line are used as external connection terminals, the resonance frequency of the coil pair as a whole can be reduced.
Further, the position of the second coil winding wound on the outermost circumference in the radial direction of the coil pair corresponds to the position in the radial direction of the first coil winding wound on the outermost circumference. The radial position of the second coil winding wound on the inner circumference corresponds to the radial position of the first coil winding wound on the innermost circumference. As a result, the second coil winding line wound on the outermost circumference is separated from the second coil winding line wound on the innermost circumference, and the resonance frequency can be effectively reduced. can.

In order to solve the above problems, the invention according to claim 2 is the coil pair according to claim 1, wherein the first coil includes a plurality of first coil winding lines each concentrically wound. , and are laminated with an insulating portion interposed therebetween.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the first coil is composed of a plurality of first coil winding lines each concentrically wound with an insulating portion interposed therebetween. Since they are laminated, the transmission efficiency and reflectivity of the coil pair can be improved.

In order to solve the above problems, the invention according to claim 3 provides the coil pair according to claim 2, wherein the first coil includes two first coil winding lines each of which is concentrically wound. are laminated with the insulating portion interposed therebetween, one of the first coil winding lines is concentrically wound from the outer peripheral side to the inner peripheral side of the first coil, and the other of the first coil winding lines One coil winding line is wound concentrically from the inner peripheral side of the first coil toward the outer peripheral side thereof and in a direction opposite to the one of the first coil winding lines, and the one of the first coil winding lines and the innermost peripheral end of the other first coil winding line are connected, and the outermost peripheral end of the one first coil winding line and the other The outermost peripheral end of the first coil winding line is open.

According to the third aspect of the invention, in addition to the effects of the second aspect of the invention, one first coil winding line is concentrically wound from the outer peripheral side to the inner peripheral side of the first coil. Another first coil winding line is wound concentrically from the inner circumference side to the outer circumference side of the first coil and in a direction opposite to the one first coil winding line, and the one first coil winding line The innermost peripheral end of the line and the innermost peripheral end of the other first coil winding line are connected, and the outermost peripheral end of the one first coil winding line and the other first coil winding line are connected. Since the outermost peripheral end of the line is open, the transmission efficiency of the coil pair can be improved while reducing the resonance frequency of the coil pair as a whole.

In order to solve the above problems, the invention according to claim 4 provides the coil pair according to claim 2, wherein the first coil includes two first coil winding lines each of which is concentrically wound. are laminated with the insulating portion interposed therebetween, and both ends of one of the first coil winding lines and both ends of the other first coil winding line are open, and the one and the other first coil winding line are insulated from each other.

According to the invention recited in claim 4, in addition to the effect of the invention recited in claim 2, both ends of one first coil winding line and both ends of the other first coil winding line are Since the first coil winding line is open and the other first coil winding line is insulated from each other, the transmission efficiency of the coil pair is improved while reducing the resonance frequency of the coil pair as a whole. can be improved.

In order to solve the above problems, the invention according to claim 5 provides a coil pair for contactless power transmission, wherein the first coil for power transmission or power reception comprises two concentrically wound coils. The two first coil winding lines are a first coil configured by laminating an insulating portion in between, and a second coil to which the power to be transmitted is supplied during power transmission and to which the received power is output during power reception. and a second coil that is concentrically laminated with respect to the first coil, wherein the second coil winding line of the second coil is concentrically and in the same winding direction and in the same radial direction in the coil pair. , and is configured by winding two or more turns in one layer, both ends of the second coil winding line are used as external connection terminals, both ends of the one first coil winding line, Both ends of the other first coil winding line are open, and the one first coil winding line and the other first coil winding line are insulated from each other.

According to the fifth aspect of the present invention, the second coil, which is concentrically laminated with respect to the first coil, is arranged such that the second coil winding lines are arranged concentrically, in the same winding direction, and in the same radial direction in the coil pair. Since both ends of the second coil winding line are used as external connection terminals, the resonance frequency of the coil pair as a whole can be reduced.
In addition, since the first coil is configured by laminating two first coil winding lines, each of which is concentrically wound, with an insulating portion interposed therebetween, the transmission efficiency and reflectance of the coil pair can be improved. can be done.
Furthermore, both ends of the one first coil winding line and both ends of the other first coil winding line are open, and the one first coil winding line and the other first coil winding line are open. , are insulated from each other, the transmission efficiency of the coil pair can be improved while reducing the resonance frequency of the coil pair as a whole.

In order to solve the above problems, the invention according to claim 6 provides the coil pair according to any one of claims 1 to 5, wherein the second coil has a winding line of the second coil. It is wound more than once and less than or equal to five times.

According to the invention described in claim 6, in addition to the effects of the invention described in any one of claims 1 to 5, the second coil winding line is wound more than once but not more than five times. Since the second coil is composed of the second coil, the transmission efficiency can be improved while effectively reducing the resonance frequency.

In order to solve the above problems, the invention according to claim 7 comprises a power transmitting device and a power receiving device separated from the power transmitting device, and transmits power from the power transmitting device to the power receiving device in a contactless manner. 7. In the power transmission device included in the power transmission system, a power transmission coil pair that is the coil pair according to any one of claims 1 to 6, and an output that outputs power to be transmitted to the power transmission coil pair a means;

In order to solve the above problems, the invention according to claim 8 comprises a power transmitting device and a power receiving device separated from the power transmitting device, and transmits power from the power transmitting device to the power receiving device in a contactless manner. 7. The power receiving device included in a power transmission system comprising: the coil pair according to any one of claims 1 to 6, wherein the power receiving coil pair is arranged to face the power transmitting device; and input means connected to the receiving coil pair.

In order to solve the above problems, the invention according to claim 9 is the power transmission device according to claim 7, and a power reception device that is separated from the power transmission device and arranged to face the power transmission coil pair. a power receiving device that receives power transmitted from the power transmitting device.

In order to solve the above problems, the invention according to claim 10 provides a power transmission device and a power reception device according to claim 8, wherein the power transmission 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 arranged to face each other and receiving power transmitted from the power transmitting device.

According to the invention of any one of claims 7 to 10, at least one of the power transmitting coil pair provided in the power transmitting device and the power receiving coil pair provided in the power receiving device constituting the power transmission system is the coil pair according to any one of claims 1 to 6, it is possible to reduce the resonance frequency of the power transmission system as a whole, thereby suppressing power loss and heat generation.

According to one aspect of the present invention, the second coil, which is concentrically laminated with respect to the first coil, is arranged such that the second coil winding line is concentrically and in the same winding direction and in the same radial direction in the coil pair. Since both ends of the second coil winding line are used as external connection terminals at the outermost periphery of the coil pair, the resonance frequency of the coil pair as a whole is reduced. can do.
Further, the position of the second coil winding wound on the outermost circumference in the radial direction of the coil pair corresponds to the position in the radial direction of the first coil winding wound on the outermost circumference. The radial position of the second coil winding wound on the inner circumference corresponds to the radial position of the first coil winding wound on the innermost circumference. As a result, the second coil winding line wound on the outermost circumference is separated from the second coil winding line wound on the innermost circumference, and the resonance frequency can be effectively reduced. can.
On the other hand, according to another aspect of the present invention, the second coil, which is concentrically laminated with respect to the first coil, the second coil winding line is concentric, in the same winding direction, and in the same radial direction in the coil pair, Since the coil is wound two or more times in one layer, and both ends of the second coil winding line are used as external connection terminals, the resonance frequency of the coil pair as a whole can be reduced.
In addition, since the first coil is configured by laminating two first coil winding lines, each of which is concentrically wound, with an insulating portion interposed therebetween, the transmission efficiency and reflectance of the coil pair can be improved. can be done.
Furthermore, both ends of the one first coil winding line and both ends of the other first coil winding line are open, and the one first coil winding line and the other first coil winding line are open. , are insulated from each other, the transmission efficiency of the coil pair can be improved while reducing the resonance frequency of the coil pair as a whole.

Therefore, when adjusting the resonance frequency of the coil pair, the length of the winding line of each of the plurality of coils can be shortened, and power loss and heat generation due to the electrical resistance of the winding line can be suppressed.

1 is a block diagram showing a schematic configuration of a power transmission system according to a first embodiment; FIG. It is a top view (i) which shows the structure of the coil of 1st Embodiment. It is a top view (ii) which shows the structure of the coil of 1st Embodiment. It is a top view (iii) which shows the structure of the coil of 1st Embodiment. It is a top view (iv) which shows the structure of the coil of 1st Embodiment. 6 is a cross-sectional view of the A-A' portion of FIG. 5; FIG. FIG. 4 is a diagram showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the first embodiment; It is a top view (i) which shows the structure of the coil of 2nd Embodiment. It is a top view (ii) which shows the structure of the coil of 2nd Embodiment. It is a top view (iii) which shows the structure of the coil of 2nd Embodiment. It is a top view (iv) which shows the structure of the coil of 2nd Embodiment. It is a top view (v) which shows the structure of the coil of 2nd Embodiment. FIG. 11 is a plan view showing the structure of the coil of the third embodiment; FIG. 10 is a diagram showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of each of the second embodiment and the third embodiment; It is a top view (i) which shows the structure of the coil of 4th Embodiment. It is a top view (ii) which shows the structure of the coil of 4th Embodiment. It is a top view (iii) which shows the structure of the coil of 4th Embodiment. FIG. 10 is a diagram showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the fourth embodiment;

Next, the form for implementing this invention is demonstrated based on drawing. In each embodiment described below, electric power for charging a rechargeable battery installed in an electric vehicle is wirelessly transmitted to an electric vehicle equipped with the rechargeable battery using a magnetic field resonance method. It is an embodiment when the present invention is applied to a system.

Here, the power transmission system based on the magnetic resonance method of each embodiment includes a power transmission coil that transmits power, and the power transmitted from the power transmission coil. and a power receiving coil that receives power from the The power transmission coil is configured by concentrically stacking a power transmission loop coil, which will be described later, and a power transmission open coil, which will be described later. The power receiving coil is configured by concentrically laminating a power receiving open coil, which will be described later, and a power receiving loop coil, which will be described later.

(I) First embodiment
First, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 6. FIG.

(i) Regarding the overall configuration and operation of the power transmission system of the first embodiment
The overall configuration and operation of the power transmission system of the first embodiment will be described with reference to FIG. Note that FIG. 1 is a block diagram showing a schematic configuration of the power transmission system of 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 is composed 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. When charging the storage battery, the electric vehicle is driven or stopped so 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 charging the above storage battery by the power transmission system S of the first embodiment, the power transmission device installed on the ground below the stop position of the power receiving device R mounted on the stopped electric vehicle is charged. It can be configured to transmit power from the power transmission device T via the transmission coil TC of T. In addition, for a power receiving device R mounted on a moving electric vehicle, power transmission coils TC of a plurality of power transmitting devices T installed in a section of a certain distance on the road on which the electric vehicle is moving can be used. , the power transmission device T may be configured to transmit power continuously. In this case, the power transmission section TR corresponds to an example of the "output means" of the present invention, and the power reception section RV corresponds to an example of the "input means" 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 laminated concentrically with 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 has open ends. The power receiving loop coil RL is concentrically laminated with respect to the power receiving open coil RO, and outputs power received from the power transmitting coil TC by the magnetic 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, 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, and the power transmission loop 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 regulations such as the Radio Law of the country where the power transmission system S is used. . At this time, the above-mentioned laws and regulations regulate the leakage magnetic field to be below a predetermined level in consideration of the influence on the human body, for example. Further, in order to enable interconnection between all the power transmitting devices T and the power receiving devices R, it is necessary for both of them to use frequencies within a predetermined range. The frequency or frequency band in the predetermined range must comply with the recommendations of international organizations such as ISO (International Organization for Standardization) or IEC (International Electrotechnical Commission) as the laws and regulations. In addition, since the above-mentioned international organization defines a lower limit value of transmission efficiency in consideration of a predetermined positional deviation between the power transmission coil TC and the power reception coil RC, high power transmission efficiency is required.

On the other hand, the power receiving coil RC of the power receiving device R that has received power from the power transmitting coil TC by the magnetic field resonance method outputs the received power to the power receiving unit RV. As a result, the power receiving unit RV converts an output corresponding to the power (e.g., high-frequency power of 85 kHz) into a DC (direct current) current by, e.g., a power conversion unit (not shown), and outputs it to the storage battery of the electric vehicle. As a result, the storage battery is charged with the necessary amount of electric power.

(ii) Configuration of power transmitting coil TC (power receiving coil RC)
Next, configurations of the power transmission coil TC and the power reception coil RC of the first embodiment, which are used in the power transmission system S of the first embodiment described above, will be described with reference to FIGS. 2 to 6. FIG. Note that the power transmitting coil TC and the power receiving coil RC of the embodiment basically have 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. Further, the configuration of the power transmission open coil TO and the configuration of the power reception open coil RO are basically the same. Further, the positional relationship within the power transmitting coil TC between the power transmitting loop coil TL and the power transmitting open coil TO, and the positional relationship within the power receiving coil RC between the power receiving loop coil RL and the power receiving open coil RO are basically are identical. Therefore, in the following description, the structure of the power transmitting coil TC will be described. 2 to 5 are plan views showing the structure of the power transmission coil TC of the embodiment, and FIG. 6 is a partial cross-sectional view showing the structure of the power transmission coil TC of the embodiment. 2 to 5 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 the plan view of FIG. 2, in the power transmission coil TC of the embodiment, a power transmission loop coil TL and a power transmission open coil TO (not shown in FIG. 2) are combined with an insulating film BF1 (described in detail later). 2 are laminated in the paper surface direction of FIG. The power transmission open coil TO is configured by laminating two coils CL1 and CL2, which will be described later, in the paper surface direction of FIG. 2 via an insulating film BF2 (described in detail later). In the first embodiment, the film BF1 is used for insulation between the power transmission loop coil TL and the power transmission open coil TO, and the film BF2 is used for insulation between the coil CL1 and the coil CL2. In addition to these, an insulating material such as a glass epoxy material can also be used. Also, in order to efficiently dissipate the heat generated by the power transmission coil TC, a thin film material in which ceramic particles or the like are dispersed may be used. Furthermore, the winding centers of the copper thin film wires, which will be described later, constituting the power transmission loop coil TL, the coil CL1, and the coil CL2, respectively, are the same or substantially the same. The copper thin film wire forming the coil CL1 or the coil CL2 corresponds to an example of the "first coil winding line" of the present invention.

As shown in FIG. 2, the power transmission loop coil TL is configured so that, for example, the copper thin film wire is wound in the same winding direction and in one of the radial directions of the power transmission coil TC (that is, in the direction from the outer peripheral side to the inner peripheral side or in the inner peripheral side). Either one of the directions from the peripheral side to the outer peripheral side) is wound twice (2 turns), and both ends (in the case shown in FIG. 2, the upper center of the right side) are the power transmission coil TC , and are connected to the power transmission unit TR as connection terminals O1 and O2. The copper thin film wire forming the power transmission loop coil TL corresponds to an example of the "second coil winding line" of the present invention. In addition, the copper thin film wires forming the power transmission loop coil TL are mutually insulated at the center of the right side shown in FIG. ing. Further, the copper thin-film wire forming the power transmission loop coil TL has, for example, the same width and the same thickness over the entire circumference of the power transmission loop coil TL. Furthermore, in the power transmission loop coil TL, straight portions are provided on each of the upper, lower, left, and right sides in FIG. 2, and the straight 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 in the copper thin film wire constituting the power transmission loop coil TL is the position of the power transmission loop coil TL itself in the stacking direction. It is desirable that the length is as long as possible within the range where it overlaps with the coil CL1 and the coil CL2.

Next, the configuration of the coil CL1 constituting the power transmission open coil TO, which is laminated directly below the power transmission loop coil TL via the film BF1, will be described with reference to FIG. Note that FIG. 3 is a plan view showing only the coil CL1. Also, in FIG. 3, for the sake of clarity of the drawing, part of the windings of the copper thin film wire forming the coil CL1 is omitted.

As shown in FIG. 3, a coil CL1 that constitutes the power transmission open coil TO has an open end T1 at its outermost peripheral portion. The coil CL1 is counterclockwise starting from the open end T1, and from the outermost peripheral portion to the innermost peripheral portion, for example, a copper thin film wire is spirally wound 17 and a half turns (17.5 turns). configured as follows. A via V is connected to the innermost peripheral portion of the coil CL2 for forming an electrical connection with the coil CL2 which is stacked directly under the coil CL2 in the paper surface direction of FIG. The copper thin film wire forming the coil CL1 has, for example, the same thickness over the entire circumference of the coil CL1, but its width is formed so as to increase toward the inner side of the coil CL1. Furthermore, in the coil CL1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. there is The width of the copper thin film wire that constitutes the coil CL1 is constant in the linear portion, and is formed so as to increase in width in the curved portion toward the inner side of the coil CL1.

Next, the configuration of the coil CL2 layered directly below the coil CL1 via the film BF2 will be described with reference to FIG. Note that FIG. 4 is a plan view showing only the coil CL2. Also, in FIG. 4, for the sake of clarity of the drawing, a part of windings of the copper thin film wire forming the coil CL2 is omitted.

As shown in FIG. 4, the coil CL2, which together with the coil CL1 constitutes the power transmission open coil TO, is connected to the innermost peripheral portion thereof with the via V for forming an electrical connection with the coil CL1. . That is, the coil CL1 and the coil CL2 are connected in series. Then, the coil CL2 is rotated clockwise (that is, in the direction opposite to the coil CL1) starting from the via V, from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire is spirally rotated seventeen and a half times. (17.5 turns) is wound. Further, the outermost peripheral portion thereof is an open end T2. The copper thin film wire forming the coil CL2 has, for example, the same thickness over the entire circumference of the coil CL2, but its width is formed so as to become thinner toward the outside of the coil CL2. Furthermore, 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. there is The width of the copper thin film wire that constitutes the coil CL2 is constant in the straight line portion, and is tapered toward the outer side of the coil CL2 in the curved portion.

Here, as for the positional relationship between the copper thin-film wires constituting the coil CL1 and the coil CL2, since the number of turns of each is 17 and a half turns, the coil CL1 is wound counterclockwise. and the position of the copper thin film wire of the coil CL2, which is wound clockwise, coincide with each other when viewed from the center of the winding of each of the coils CL1 and CL2. A copper thin film wire is wound. The coil CL1 and the coil CL2 are connected in series by vias V connected to their innermost peripheral portions. As a result, the winding of the coil CL1 from the outermost peripheral portion to the innermost peripheral portion is reversed (folded back) at the innermost peripheral portion, so that the coil CL2 is wound from the innermost peripheral portion to the outermost peripheral portion. It means that

Next, the positional relationship between the copper thin film wires forming the power transmission loop coil TL and the power transmission open coil TO (that is, the coil CL1 and the coil CL2) will be described with reference to FIG. Note that FIG. 5 is a plan view showing how the power transmission loop coil TL and the coil CL1 overlap. The coils CL1 of the power transmission open coil TO that are stacked via the power transmission open coils TO are indicated by dashed lines. As described above, the positional relationship between the copper thin film wires forming the coil CL1 and the coil CL2 is exactly the same in FIG.

As shown by the dashed line in FIG. 5, in the coil CL1 wound from the outer circumference to the inner circumference and connected to the coil CL2 by the via V at the innermost circumference, the copper thin film wire 1/4 of the winding pitch (i.e., the radial distance between the center lines of the copper thin film wires adjacent to each other on each side. The same shall apply hereinafter.) Each curved part is formed and the copper thin film wire is wound so as to shift. On the other hand, as shown by the solid line in FIG. 5, the copper thin-film wire (which is wound twice as shown in FIG. 2) forming the power transmission loop coil TL is located at the outer edge of the coil CL1 except for the intersection positions shown in FIG. They are laminated along the vicinity and the vicinity of the inner edge, respectively, and the connection terminal O1 and the connection terminal O2 are shaped to protrude to the outside of the winding. As a result, in the power transmission coil TC in which the power transmission loop coil TL and the power transmission open coil TO (the coil CL1 and the coil CL2) are stacked, the power transmission loop coil TL and the power transmission loop coil TL and the power transmission open coil TO Copper thin film wires forming the open coil TO (the coil CL1 and the coil CL2) are laminated so as to overlap each other.

Next, the lamination state of the power transmission loop coil TL, the coils CL1 and CL2, and the connection state of the coils CL1 and CL2 will be described with reference to FIG. explain.

As shown in FIG. 6, on the left side of FIGS. 2 to 5, the coil CL1 and the coil CL2 are stacked with the film BF2 interposed therebetween, and are electrically connected to each other through vias V. As shown in FIG. At the position of the via V, the counterclockwise winding of the coil CL1 is cut back (folded back) to form the clockwise winding of the coil CL2. On the other hand, the power transmission open coil TO and the power transmission loop coil TL composed of the coil CL1 and the coil CL2 are laminated with the film BF1 (see FIG. 2) interposed therebetween.

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

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-11, or the following (b)-1 to (b)-12 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Copper thin films are formed on both sides of the film BF2.
(a)-2: A resist is applied to each of the copper thin films (both sides) formed in (a)-1 above.
(a)-3: The resist applied in the above (a)-2 is patterned on the copper thin film wires of the coil CL1 and the coil CL2 on each side.
(a)-4: After the patterning of (a)-3 above, an etching process is performed to form copper thin film wires as the coil CL1 and the coil CL2.
(a)-5: The via V is formed to form the power transmission open coil TO.
(a)-6: A copper thin film is formed over one side of the film BF1.
(a)-7: A resist is applied on the copper thin film formed in (a)-6 above.
(a)-8: The resist applied in (a)-7 above is patterned on the copper thin film wire of the transmission loop coil TL.
(a)-9: Etching is performed after the patterning of (a)-8 above to form a copper thin film wire as the power transmission loop coil TL.
(a)-10: The power transmission open coil TO of (a)-5 above and the power transmission loop coil TL of (a)-9 above are pasted together to form a power transmission coil TC.
(a)-11: The connection terminals O1 and O2 are connected to the power transmission unit TR (in the case of the power transmission device T) or the power reception unit RV (in the case of the power reception device R).
(b) Second manufacturing method
(b)-1: Copper thin films are formed on both sides of the film BF2.
(b)-2: A through hole is formed at a position corresponding to the via V by laser or the like.
(b)-3: Copper plating is applied to the entire structure including the through holes by electroless copper plating and electrolytic copper plating to form vias V. FIG.
(b)-4: A resist is applied to one side of the copper plating formed in (b)-3 above.
(b)-5: The resist applied in (b)-4 above is patterned on the copper thin film wire of the coil CL1.
(b)-6: Etching is performed after the patterning of (b)-5 to form a copper thin film wire as the coil CL1.
(b)-7: A copper thin film is formed over one side of the film BF1.
(b)-8: The surface of (b)-7 opposite to the surface on which the copper thin film is formed and the surface of the coil CL1 of (b)-6 are pasted together via the film BF1 (see FIG. 6).
(b)-9: A resist is applied to the thin copper films on both sides of the laminate bonded in (b)-8.
(b)-10: Each of the resists applied on both sides in (b)-9 is patterned on the copper thin film wire of the coil CL2 and the copper thin film wire of the transmission loop coil TL (see FIG. 6).
(b)-11: After the patterning of (b)-10, an etching process is performed to form the copper thin film wire of the coil CL2 and the copper thin film wire of the transmission loop coil TL.
(b)-12: The connection terminals O1 and O2 are connected to the power transmission unit TR (in the case of the power transmission device T) or the power reception unit RV (in the case of the power reception device R).

(iv) Effects of the power transmission system of the first embodiment
Next, experimental results (simulation results) by the inventors of the present application with respect to the effect of 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. will be described with reference to FIG. Note that in the following description, simulation results of effects when power transmission is performed using the power transmission system S of the first embodiment are compared with simulation results of effects when power transmission is performed using the power transmission system of the comparative example. This will be explained while comparing the results. Here, as the above comparative example, a loop coil having a square shape with a side of 100 mm and a one-turn (one-turn) winding structure, and a loop coil having a side of 100 mm arranged coaxially with the central axis of the loop coil and having the same side as the loop coil An open coil including two square-shaped cylindrical coils with a structure of seventeen and a half turns (17.5 turns) (that is, an open coil with the same structure as the power transmission open coil TO or the power reception open coil RO in the first embodiment) and a power transmission system including a power transmission coil and a power reception coil.

In FIG. 7, the relationship between the S parameter (S11) indicating reflectance and the frequency is indicated by the mark (first embodiment) and the ▲ mark (comparative example), and the S parameter (S21) indicating the transmission efficiency and the resonance 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, as indicated by the ■ mark (first embodiment) and the ● mark (comparative example). In the case, it can be seen that the resonance frequency at which the transmission efficiency (S parameter S21) increases and the reflectance (S parameter S11) decreases compared to the comparative example.

As described above, according to 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) Concentrically stacked power transmitting loop coil TL (or power receiving loop coil RT) is configured such that the copper thin-film wires forming it are concentrically and in the same winding direction and in the same radial direction in the power transmitting coil TC (or power receiving coil RC). , and is configured by winding two or more times within one layer, and further, both ends of the copper thin film wire that constitutes the power transmission open coil TO (or the power reception open coil RO) are connected to the power transmission coil TC (or the power reception coil RC ) are formed as the connection terminal O1 and the connection terminal O2, the resonance frequency of the entire power transmission coil TC (or power reception coil RC) can be reduced.

In addition, since the power transmission open coil TO (or the power reception open coil RO), the coil CL1 and the coil CL2, which are respectively wound concentrically, are laminated with the film BF2 interposed therebetween, the power transmission coil TC (or the power reception coil RC) ), the transmission efficiency and reflectance can be improved.

Further, the innermost peripheral portion of the coil CL1 and the innermost peripheral portion of the coil CL2 are connected by a via V, while the outermost peripheral end portion of the coil CL1 and the outermost peripheral end portion of the coil CL2 are respectively open end T1 and open end T1. Since it is the end T2, it is possible to improve the transmission efficiency in power transmission while reducing the resonance frequency of the power transmission coil TC (or the power reception coil RC).

Furthermore, the position in the radial direction of the power transmitting coil TC (or the receiving coil RC) of the copper thin film wire of the power transmitting loop coil TL (or the power receiving loop coil RL) wound on the outermost periphery is the power transmitting loop wound on the outermost periphery. The thin copper wire of the power transmitting loop coil TL (or the power receiving loop coil RL) wound on the innermost circumference at a position corresponding to the position in the radial direction of the copper thin film wire of the open coil TO (or the power receiving open coil RO). corresponds to the position in the radial direction of the copper thin film wire of the power transmission open coil TO (or power reception open coil RO) wound on the innermost circumference. As a result, the copper thin film wire wound on the outermost circumference and the copper thin film wire wound on the innermost circumference of the power transmitting loop coil TL (or the power receiving loop coil RL) are as shown in FIG. , the resonance frequency can be effectively reduced.

(II) Second embodiment
Next, a second embodiment, which is another embodiment of the present invention, will be described with reference to FIGS. 8 to 12. FIG.

The power transmission system of the second embodiment described below differs from the power transmission system S of the first embodiment described above only in the configuration of the power transmission coil and the power reception coil of the second embodiment, and other configurations. And its manufacturing method is the same as that of the power transmission system of the first embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods 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. Furthermore, FIGS. 8 to 12 are plan views showing the structure of the power transmission open coil of the second embodiment. 1 is a plan view when looking at . At this time, in FIGS. 8 to 12, the same member numbers are assigned to the same constituent members as in the power transmission system S of the first embodiment.

As shown in the plan view of FIG. 8, the power transmission coil TC1 of the second embodiment includes the power transmission loop coil TL1 and the power transmission open coil of the second embodiment, not shown in FIG. It is laminated in the paper surface direction of FIG. 8 via an insulating film BF1 similar to that of the coil TC. The power transmission open coil of the second embodiment is configured by laminating two coils CL11 and CL12, which will be described later, in the plane direction of FIG. 8 with the film BF2 of the first embodiment interposed therebetween. Also in the second embodiment, in addition to the film BF1 or the film BF2, 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. Furthermore, the winding centers of the copper thin film wires that respectively constitute the power transmission loop coil and the coils CL11 and CL12 of the second embodiment are the same or substantially the same.

As shown in FIG. 8, the power transmission loop coil TL1 is configured by, for example, winding a copper thin film wire three turns (three turns) in the same winding direction and one of the radial directions of the power transmission coil TC1. Both end portions (in the case shown in FIG. 8, the upper center portion of the right side portion) are drawn out to the outermost peripheral portion of the power transmission coil TC1 to form connection terminals O1 and O2 connected to the power transmission section TR. In addition, the copper thin-film wires forming the power transmission loop coil TL1 are mutually insulated at the center of the right side shown in FIG. ing. Furthermore, the copper thin film wire that constitutes the power transmission loop coil TL1 has, for example, the same width and the same thickness over the entire circumference of the power transmission loop coil TL1. Furthermore, in the power transmission loop coil TL1, straight lines are provided on each of the upper side, lower side, left side, and right side in FIG. 8, and the straight lines are connected by curved lines. Here, the distance between each turn of the thin copper film wire constituting the power transmission loop coil TL1 is within the range where the position of the power transmission loop coil TL1 itself overlaps with the coil CL11 and the coil CL12 in the stacking direction. As with the power transmission loop coil TL of the first embodiment, it is desirable that the length is as long as possible.

Next, the configuration of the coil CL11 constituting the power transmission open coil of the second embodiment, which is laminated directly below the power transmission loop coil TL1 via the film BF1, will be described with reference to FIG. 9 is a plan view showing only the coil CL11.

As shown in FIG. 9, a coil CL11 that constitutes the power transmission open coil of the second embodiment has an open end T11 at the outermost peripheral portion thereof. In the coil CL1, for example, a copper thin film wire is spirally wound ten and a half turns (10.5 turns) counterclockwise starting from the open end T11, from the outermost peripheral portion to the innermost peripheral portion. It is configured. Further, a via V is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL12 which is layered directly under the coil CL12 in the paper surface direction of FIG. The copper thin film wire forming the coil CL1 has, for example, the same width and the same thickness over the entire circumference of the coil CL1. Furthermore, in the coil CL11, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. there is

Next, the configuration of the coil CL12 laminated directly below the coil CL11 via the film BF2 will be described with reference to FIG. 10 is a plan view showing only the coil CL12.

As shown in FIG. 10, the coil CL12, which together with the coil CL11 constitutes the power transmission open coil of the second embodiment, has the via V for forming an electrical connection with the coil CL11 at its innermost peripheral portion. It is connected. That is, the coil CL11 and the coil CL12 are connected in series. Then, the coil CL12 is rotated clockwise starting from the via V (that is, in the direction opposite to the coil CL11), from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirals five and a half turns ( 5.5 turns). Further, the outermost peripheral portion thereof is an open end T12. The copper thin film wire forming the coil CL12 has, for example, the same width and the same thickness over the entire circumference of the coil CL2. Furthermore, in the coil CL12, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. there is

Here, regarding the positional relationship between the copper thin film wires constituting the coil CL11 and the coil CL12, the number of turns of the thin copper wires is different between ten and a half turns and five and a half turns, but they are wound in the counterclockwise direction. The position of the copper thin film wire of the coil CL11 that is wound in the clockwise direction is aligned with the position of the copper thin film wire of the coil CL12 that is wound in the clockwise direction when viewed from the winding center of each of the coils CL11 and CL12. , each copper thin film wire is wound. The coil CL11 and the coil CL12 are connected in series by vias V connected to their innermost peripheral portions. As a result, the winding of the coil CL11 from the outermost peripheral portion to the innermost peripheral portion is reversed (folded back) at the innermost peripheral portion, thereby winding the coil CL12 from the innermost peripheral portion to the outermost peripheral portion. It means that As a result, as shown in FIGS. 9 and 10, the width of the copper thin film wire forming the coil CL11 is narrower than the width of the copper thin film wire forming the coil CL12.

Next, the positional relationship between the copper thin-film wires respectively constituting the power transmission loop coil TL1 and the power transmission open coil of the second embodiment (that is, the coil CL11 and the coil CL12) will be described with reference to FIGS. 11 and 12. . Note that FIG. 11 is a plan view showing the overlapping state of the power transmission loop coil TL1 and the coil CL11. The coils CL11 that are stacked in between are indicated by dashed lines. FIG. 12 is a plan view showing the overlapping state of the coil CL11 and the coil CL12 of the power transmission open coil of the second embodiment. The coils CL12 that are stacked via the coils CL12 are indicated by dashed lines.

As indicated by the dashed line in FIG. 11, in the coil CL11 wound from the outer circumference to the inner circumference and connected to the coil CL12 by the via V at the innermost circumference, the copper thin film wire Each curved portion is formed and the copper thin film wire is wound so that the position of the straight portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding. On the other hand, as indicated by the solid line in FIG. 11, the power transmitting loop coil TL1 is laminated along the width of the coil CL11, and the connecting terminal O1 and the connecting terminal O2 are shaped to protrude outward from the winding. .

Next, as shown by the dashed line in FIG. 12, even in the coil CL12 wound from the inner circumference to the outer circumference and connected to the coil CL11 by the via V at the innermost circumference, copper The copper thin film wire is wound so that each curved portion is formed so that the position of the straight portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin film wire. On the other hand, as indicated by the solid line in FIG. 12, the coil CL11 is laminated along the outer edge of the coil CL12, and vias V connect them in series.

As shown in FIGS. 11 and 12 above, in the power transmission coil TC1 in which the power transmission loop coil TL1 and the coils CL11 and CL12 of the power transmission open coil of the second embodiment are stacked, the power transmission The copper thin film wires forming the loop coil TL1, the coil CL11, and the coil CL12 are laminated so as to substantially overlap each other.

As described above, according to the power transmission using the power transmission system of the second embodiment including the power transmission coil TC1 and the power reception coil RC1 of the second embodiment, power using the power transmission system S of the first embodiment In addition to the effect of transmission, the number of turns of the copper thin film wire that constitutes the power transmission loop coil TL1 is three, so it is possible to effectively reduce the resonance frequency and improve the transmission efficiency.

(III) Third embodiment
Next, a third embodiment, which is still another embodiment of the present invention, will be described with reference to FIGS. 13 and 14. FIG.

In the power transmission system of the third embodiment described below, the power transmission loop coil (and the power receiving loop coil) in the power transmission coil (and the power receiving coil) of the third embodiment is different from the power transmission system of the second embodiment described above. , and other configurations including the power transmission open coil (and power reception open coil) of the third embodiment and the manufacturing method thereof are the same as those of the power transmission system of the second embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods will be omitted. Further, similarly to the power transmission system S of the first embodiment, the configuration of the power transmission loop coil of the third embodiment and the configuration of the power reception loop coil of the third embodiment are basically the same. Therefore, in the following description, the structure of the power transmission loop coil of the third embodiment will be described. Furthermore, FIG. 13 is a plan view showing the structure of the power transmission loop coil of the third embodiment, in which the power transmission coil of the third embodiment is viewed from the power transmission section side of the third embodiment in the power transmission device of the third embodiment. It is a plan view of the case. At this time, in FIG. 13, the same member numbers are assigned to the same constituent members as in the power transmission system S of the first embodiment.

As shown in the plan view of FIG. 13, the power transmission coil TC2 of the third embodiment includes the power transmission loop coil TL2 and the power transmission open coil of the third embodiment (not shown in FIG. 13). It is laminated in the paper surface direction of FIG. 13 via an insulating film BF1 similar to that of the coil TC. Also in the third embodiment, an insulating material such as a glass epoxy material or a thin film material in which ceramic particles or the like are dispersed can be used for insulation other than the film. Furthermore, the winding centers of the copper thin film wires forming the power transmission loop coil TL2 and the coils CL11 and CL12 of the power transmission open coils of the third embodiment are made the same or substantially the same.

As shown in FIG. 13, the power transmission loop coil TL2 is configured by, for example, winding a copper thin film wire in the same winding direction and one of the radial directions of the power transmission coil TC2 for five turns (five turns). Both end portions (in the case shown in FIG. 13, the upper center portion of the right side portion) are drawn out to the outermost peripheral portion of the power transmission coil TC2 to serve as connection terminals O1 and O2 connected to the power transmission section TR. In addition, the copper thin-film wires constituting the power transmission loop coil TL2 are mutually insulated at the center of the right side shown in FIG. ing. Furthermore, the copper thin film wire forming the power transmission loop coil TL2 has, for example, the same width and the same thickness over the entire circumference of the power transmission loop coil TL2. Furthermore, in the power transmission loop coil TL2, straight lines are provided in each of the upper side, lower side, left side, and right side in FIG. 13, and the respective straight lines are connected by curved lines. Here, the distance between each turn of the copper thin film wire constituting the power transmission loop coil TL2 is such that the position of the power transmission loop coil TL2 itself overlaps the coils CL11 and CL12 of the third embodiment in the stacking direction. Within this range, it is desirable that it is as long as possible, like the power transmission loop coil TL of the first embodiment.

As described above, according to power transmission using the power transmission system of the third embodiment that includes the power transmission coil TC2 and the power reception coil RC2 of the third embodiment, power using the power transmission system S of the first embodiment In addition to the effect of transmission, since the number of turns of the copper thin film wire forming the power transmission loop coil TL2 is five, it is possible to further effectively reduce the resonance frequency and improve the transmission efficiency.

(IV) Effects of the power transmission system of the second embodiment and the power transmission system of the third embodiment
Next, the effect of performing power transmission using the power transmission system of the second embodiment including the power transmission coil TC1 and the power reception coil RC1 of the second embodiment, and the power transmission coil TC2 and the power reception coil of the third embodiment The effects of power transmission using the power transmission system of the third embodiment including RC2 will be described based on experimental results (simulation results) by the inventors of the present application with reference to FIG. 14 . Note that in the following description, simulation results of effects when power transmission is performed using the power transmission system of the second embodiment and effects when power transmission is performed using the power transmission system of the third embodiment are described. The simulation results will be described while comparing them with the simulation results of the effect when power transmission is performed using the power transmission system of the comparative example. Here, as the above comparative example, a loop coil having a square shape with a side of 100 mm and a one-turn (one-turn) winding structure, and a loop coil having a side of 100 mm arranged coaxially with the central axis of the loop coil and having the same side as the loop coil A power transmission system including a power transmission coil and a power reception coil having a square shape and having the same configuration as the power transmission open coil of the second embodiment or the third embodiment was used.

In FIG. 14, the relationship between the S parameter (S11) indicating the reflectance and the frequency is indicated by ▲ mark (second embodiment), ★ mark (third embodiment) and ◆ mark (comparative example), and the transmission efficiency is shown. The relationship between the S parameter (S21) and the resonance frequency shown in the power transmitting coil TC1 of the second embodiment is indicated by the ▼ mark (second embodiment), the ● mark (third embodiment), and the ■ mark (comparative example). and power receiving coil RC1 of the second embodiment, and when using the power transmission system of the third embodiment including the power transmitting coil TC2 and the power receiving coil RC2 of the third embodiment, the transmission efficiency (S parameter S21) is higher than that of the comparative example, and the reflectance (S parameter S11) is lower than that of the comparative example.

(V) Fourth embodiment
Finally, a fourth embodiment, which is still another embodiment of the present invention, will be described with reference to FIGS. 15 to 18. FIG.

(i) Concerning the configuration of the power transmitting coil (power receiving coil) of the fourth embodiment
In the power transmission system of the fourth embodiment described below, in contrast to the power transmission system of the first embodiment or the power transmission system of the second embodiment, the power transmission coil (and the power reception coil) of the fourth embodiment Only the configuration of the power transmission open coil (and power reception open coil) is different, and other configurations including the power transmission loop coil (and power reception loop coil) of the fourth embodiment and the manufacturing method thereof are the same as those of the power transmission system of the first embodiment. Or it is the same as the power transmission system of the second embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods will be omitted. Further, similarly to the power transmission system S of the first embodiment or the power transmission system of the second embodiment, the configuration of the power transmission open coil of the fourth embodiment and the configuration of the power reception open coil of the fourth embodiment are basically are identical. Therefore, in the following description, the structure of the power transmission open coil of the fourth embodiment will be described. Further, FIGS. 15 to 17 are plan views showing the structure of the power transmission open coil of the fourth embodiment. 1 is a plan view when looking at . At this time, in FIGS. 15 to 17, the same member numbers are assigned to the same constituent members as those of the power transmission system S of the first embodiment or the power transmission system of the second embodiment.

First, the power transmission system S of the first embodiment or the power transmission system S of the fourth embodiment, which is laminated directly below the power transmission loop coil of the fourth embodiment via the film BF1 similar to that of the power transmission system of the second embodiment. The structure of the coil CL21 that constitutes the power transmission open coil will be described with reference to FIG. 15 . 15 is a plan view showing only the coil CL21.

As shown in FIG. 15, the coil CL21 constituting the power transmission open coil of the fourth embodiment has open ends T21-1 and T21-2 at the outermost and innermost peripheral portions, respectively. . The coil CL21 is counterclockwise starting from the open end T21-1, from the outermost periphery to the innermost periphery, for example, a copper thin film wire spirally wound about ten and a half turns (about 10.5 turns). It is configured to be turned, and its innermost peripheral portion is the open end T21-2. That is, in the power transmission open coil of the fourth embodiment, the coil CL21 and a later-described coil CL22, which constitutes the power transmission open coil of the fourth embodiment together with the coil CL21, are insulated from each other. The via V in the modes and third embodiment does not exist in the power transmission open coil of the fourth embodiment. On the other hand, the copper thin film wire constituting the coil CL21 has, for example, the same thickness over the entire circumference of the coil CL21, but its width is inside the coil CL21, like the coil CL1 of the first embodiment. It is formed to be thicker according to Furthermore, 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. there is The width of the copper thin film wire forming the coil CL21 is constant in the straight line portion, and is formed so as to increase in width toward the inner side of the coil CL21 in the curved portion.

Next, the configuration of the coil CL22 stacked directly below the coil CL21 via the film BF2 similar to that of the power transmission system S of the first embodiment or the power transmission system of the second embodiment will be described with reference to FIG. explain. FIG. 16 is a plan view showing only the coil CL22.

As shown in FIG. 16, the coil CL22, which constitutes the power transmission open coil of the fourth embodiment together with the coil CL21, has an innermost peripheral portion and an outermost peripheral portion, respectively, which are open ends T22-2 and T22-1. It is said that Then, the coil CL22 rotates clockwise starting from the open end T22-2 (that is, in the opposite direction to the coil CL21), from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally spirals about two times. It is wound by half a turn (approximately 2.5 turns), and the outermost peripheral portion thereof is the open end T22-1. In addition, the copper thin film wire forming the coil CL22 has, for example, the same thickness over the entire circumference of the coil CL22, but its width is outside the coil CL22 as in the case of the coil CL2 of the first embodiment. It is formed to be thinner according to Furthermore, 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. there is The width of the copper thin film wire that constitutes the coil CL22 is constant in the straight line portion, and is tapered toward the outer side of the coil CL22 in the curved portion.

On the other hand, as for the positional relationship between the copper thin-film wires respectively constituting the coil CL21 and the coil CL22, the position of the center of winding of the coil CL21 and the position of the center of winding of the coil CL22 are coincident or approximately equal to each other. The coil CL21 and the coil CL22 are stacked so as to match. In addition, the coil CL21 and the coil CL22 have different numbers of turns, about ten and a half turns and about two and a half turns. , and the position (range) of the copper thin film wire portion of the coil CL22 in the radial direction of the coil CL22 match or substantially match each other when viewed from the winding center of each of the coils CL21 and CL22. Wire is wound.

Next, the positional relationship between the copper thin film wires forming the power transmission open coils (that is, the coil CL21 and the coil CL22) of the fourth embodiment will be described with reference to FIG. Note that FIG. 17 is a plan view showing the overlapping state of the coil CL21 and the coil CL22 of the power transmission open coil of the fourth embodiment. The coils CL22 stacked via the coils CL22 are indicated by dashed lines.

As shown by the solid line in FIG. 17, in the coil CL21 wound from the outer circumference to the inner circumference and having open ends T21-1 and T21-2 at both ends, , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. Further, as shown by the dashed line in FIG. 17, even with the coil CL22 wound from the inner circumference to the outer circumference and having open ends T22-2 and T22-1 at both ends, Then, the thin copper wire is wound with each curved portion so that the position of the straight portion is shifted to the outer peripheral side by a quarter of the pitch of the winding of the thin copper wire.

As shown in FIG. 17 above, in the power transmission coil of the fourth embodiment in which the coil CL21 and the coil CL22 of the power transmission open coil of the fourth embodiment are stacked, the coil CL21 and the coil CL22 are arranged on the top, bottom, left, and right sides, respectively. Each copper thin film wire is laminated so as to be substantially overlapped with each other.

(ii) Effects of the power transmission system of the fourth embodiment
Next, a fourth embodiment including the power transmitting coil of the fourth embodiment including the power transmitting coil of the fourth embodiment and the power receiving coil of the fourth embodiment having the same configuration as the power transmitting coil of the fourth embodiment. The effect of power transmission using the power transmission system of the embodiment will be described based on the experimental results (simulation results) by the inventors of the present application with reference to FIG. 18 . Note that in the following description, the simulation results of the effect when power transmission is performed using the power transmission system of the fourth embodiment are compared with the simulation results of the effect when power transmission is performed using the power transmission system of the comparative example. I will explain while comparing with.

Here, in the following description using FIG. 18, a power transmission coil in which the power transmission open coil of the fourth embodiment (see FIGS. 15 to 17) and the power transmission loop coil TL of the first embodiment are concentrically laminated, When power transmission is performed using a power receiving coil in which a power receiving open coil having the same configuration as the power transmitting open coil of the fourth embodiment and a power receiving loop coil having the same configuration as the power transmitting loop coil TL are concentrically laminated. Experimental results will be described as a first example. Further, a power transmission coil in which the power transmission open coil of the fourth embodiment and the power transmission loop coil TL1 of the second embodiment are concentrically laminated, a power reception open coil having the same configuration as the power transmission open coil of the fourth embodiment, and the power transmission Experimental results in the case of performing power transmission using a power receiving coil in which a power receiving loop coil having the same configuration as the loop coil TL1 is concentrically laminated will be described as a second example. Furthermore, as the above comparative example, a loop coil having a square shape with a side of 150 mm and a one-turn (one-turn) winding structure, and a square with a side of 150 mm arranged coaxially with the central axis of the loop coil and having the same side as the loop coil A power transmission system including a power transmission coil and a power reception coil, each having a shape and an open coil having a configuration similar to that of the power transmission open coil of the fourth embodiment, was used.

In FIG. 18, the relationship between the S parameter (S11) indicating the reflectance and the resonance frequency is indicated by a mark (first embodiment), a star (second embodiment), and a mark (comparative example). The relationship between the S parameter (S21) indicating the efficiency and the resonance frequency is indicated by the ▪ mark (first embodiment), the ● mark (second embodiment), and the ▼ mark (comparative example). When the power transmission system of the fourth embodiment including the power transmission coil and the power reception coil is used, the transmission efficiency (S parameter S21) is higher than that of the comparative example and the reflectance (S parameter S11) is generally lower than that of the comparative example. , it can be seen that the transmission efficiency is improved as a whole compared to the comparative example. In addition to this, when the power transmission system of the fourth embodiment is used, the resonance frequency is also lowered, thereby adjusting the resonance frequency as the power transmission system of the fourth embodiment. In this case, the length of each of the copper thin film wires of the coil CL21 and the coil CL22 can be shortened, and power loss and heat generation due to the electrical resistance of the copper thin film wires can be suppressed.

As described above, according to power transmission using the power transmission system of the fourth embodiment including the power transmission coil and the power reception coil of the fourth embodiment, power transmission using the power transmission system S of the first embodiment Effect (resonance by connecting the innermost peripheral portions of the coil CL1 and the coil CL2 of the first embodiment and making the outermost peripheral end portions of the coil CL1 and the coil CL2 the open end T1 and the open end T2) In addition to the effect of achieving both frequency reduction and transmission efficiency improvement), both ends of the coil CL21 and the coil CL22 that constitute the power transmission open coil (or the power reception open coil) are open ends T21-1 and open Since the end T21-2, the open end T22-1, and the open end T22-2 are provided, it is possible to effectively reduce the resonance frequency and improve the transmission efficiency.

In the power transmission system of the second embodiment, the power transmission loop coil TL1 is formed by winding the thin copper wire three times, and in the power transmission system of the third embodiment, the thin copper wire is wound five times. Although the power transmission loop coil TL2 is formed by winding the copper thin-film wire in more than one turn, the power transmission loop coil may also be formed by winding the thin copper wire in more than one turn and five turns or less. The inventors of the present invention have confirmed that the power transmission system of the embodiment or the power transmission system of the fourth embodiment can achieve the same effects (see FIGS. 14 and 18).

Further, in each of the above-described embodiments, for each coil that constitutes the power transmission open coil, the open end of each outermost peripheral portion is at the same position in the winding, and the innermost peripheral portion is also at the same position in the winding. However, in addition to this, either 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 in which the coils constituting the power transmitting open coil or the power receiving open coil in each of the above-described embodiments are formed are replaced (that is, the position of each coil viewed from the power transmitting loop coil or the power receiving loop coil ( Even if the order ) is exchanged), the same effect as each embodiment can be obtained.

Furthermore, in each of the above-described embodiments, a capacitor is further connected in series or in parallel to the power transmitting loop coil or the power receiving loop coil, or the open end of the power transmitting open coil or power receiving open coil. , the power transmitting loop coil or the power receiving loop coil, or the parasitic capacitance of the power transmitting open coil or the power receiving open coil may be adjusted to further lower the resonance frequency. At this time, when a capacitor is connected in series with the open end of either the power transmission open coil or the power reception open coil, the terminal of the capacitor that is not connected to either of the open ends may be the open end. .

INDUSTRIAL APPLICABILITY 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 storage batteries mounted on electric vehicles. effect is obtained.

S Power transmission system R Power receiving device T Power transmitting device V Via RV Power receiving unit RC, RC1, RC2 Power receiving coil TR Power transmitting unit TC, TC1, TC2 Power transmitting coil TL, TL1, TL2 Power transmitting loop coil TO Power transmitting open coil RO Power receiving open coil RL Power receiving Loop coil O1, O2 Connection terminal BF1, BF2 Film CL1, CL2, CL11, CL12, CL21, CL22 Coil T1, T2, T11, T12, T21-1, T21-2, T22-1, T22-2 Open end

Claims (10)

In a coil pair for contactless power transmission,
a first coil for power transmission or power reception , which is formed by winding a first coil winding line ;
a second coil, which is concentrically laminated with respect to the first coil, to which the power to be transmitted is supplied during power transmission and to which the received power is output during power reception;
with
The second coil is configured such that the second coil winding line is wound two or more times in one layer concentrically, in the same winding direction, and in the same radial direction in the coil pair,
Both ends of the second coil winding line are terminals for external connection ,
The position of the second coil in the radial direction of the coil pair corresponds to the position of the first coil in the radial direction,
The radial position of the second coil winding wound around the outermost circumference of the second coil corresponds to the radial position of the first coil winding wound around the outermost circumference of the first coil. is assumed to be equivalent to
The position in the radial direction of the second coil winding wound on the innermost circumference of the second coil corresponds to the radial direction of the first coil winding wound on the innermost circumference of the first coil. A coil pair characterized in that the position corresponds to the position in . In the coil pair according to claim 1,
A coil pair, wherein the first coil is configured by laminating a plurality of the first coil winding lines, each of which is concentrically wound, with an insulating portion interposed therebetween. In the coil pair according to claim 2,
The first coil is configured by stacking two concentrically wound first coil winding lines with the insulating portion sandwiched therebetween,
one of the first coil winding lines is concentrically wound from the outer peripheral side to the inner peripheral side of the first coil,
another of the first coil winding lines is wound concentrically from the inner peripheral side of the first coil toward the outer peripheral side thereof in a direction opposite to the one of the first coil winding lines;
the innermost peripheral end portion of the one of the first coil winding lines and the innermost peripheral end portion of the other first coil winding line are connected,
A coil pair, wherein an outermost peripheral end portion of the one of the first coil winding lines and an outermost peripheral end portion of the other of the first coil winding lines are open. In the coil pair according to claim 2,
The first coil is configured by stacking two concentrically wound first coil winding lines with the insulating portion sandwiched therebetween,
Both ends of one of the first coil winding lines and both ends of the other first coil winding line are open,
A coil pair, wherein the one of the first coil winding lines and the other of the first coil winding lines are insulated from each other. In a coil pair for contactless power transmission,
a first coil for power transmission or power reception, the first coil configured by stacking two concentric first coil winding lines with an insulating portion sandwiched therebetween ;
a second coil, which is concentrically laminated with respect to the first coil, to which the power to be transmitted is supplied during power transmission and to which the received power is output during power reception;
with
The second coil is configured such that the second coil winding line is wound two or more times in one layer concentrically, in the same winding direction, and in the same radial direction in the coil pair,
Both ends of the second coil winding line are terminals for external connection ,
Both ends of one of the first coil winding lines and both ends of the other first coil winding line are open,
A coil pair , wherein the one of the first coil winding lines and the other of the first coil winding lines are insulated from each other . In the coil pair according to any one of claims 1 to 5,
A coil pair, wherein the second coil is configured by winding the second coil winding line more than once but not more than five times. The power transmitting device included in a power transmission system configured by a power transmitting device and a power receiving device separated from the power transmitting device and transmitting power from the power transmitting device to the power receiving device in a contactless manner,
A power transmission coil pair that is the coil pair according to any one of claims 1 to 6;
output means for outputting power to be transmitted to the pair of power transmission coils;
A power transmission device comprising: The power receiving device included in a power transmission system that includes a power transmitting device and a power receiving device that is remote from the power transmitting device and that transmits power from the power transmitting device to the power receiving device in a contactless manner,
The coil pair according to any one of claims 1 to 6, wherein the power receiving coil pair is arranged to face the power transmitting device;
input means connected to the receiving coil pair;
A power receiving device comprising: The power transmission device according to claim 7;
a power receiving device that is spaced apart from the power transmitting device and arranged to face the pair of power transmitting coils, the power receiving device receiving power transmitted from the power transmitting device;
A contactless power transmission system comprising: a power transmission device;
9. The power receiving device according to claim 8, 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 contactless power transmission system comprising:

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