JP6806600B2 - Non-contact power transmission unit and non-contact power transmission system - Google Patents

Description

The present invention relates to a non-contact power transmission unit and a non-contact power transmission system.

Conventionally, a non-contact power transmission device transmits power from a non-contact power transmission unit on the transmitting side to a non-contact power transmission unit on the receiving side in a non-contact manner. The non-contact power transmission unit on the power transmission side or the power reception side includes a power transmission coil that transmits power by electromagnetic induction or the like, and a magnetic field is radiated from the power transmission coil when a current flows through the power transmission coil. Patent Document 1 has a plurality of unit coils obtained by dividing the power transmission coil in order to suppress the influence of the radiated magnetic field radiated from the power transmission coil on the outside, and applies a reverse current to the adjacent unit coils. The flowing radiant magnetic field is offset and suppressed.

Japanese Unexamined Patent Publication No. 2012-134217

By the way, it is desired that the non-contact power transmission unit includes a communication device together with the power transmission coil. In this case, the non-contact power transmission unit tends to install the communication device away from the power transmission coil in order to suppress the influence of the radiated magnetic field by the power transmission coil on the communication device. For this reason, the non-contact power transmission unit has a large unit, and there is room for improvement in this respect.

Therefore, the present invention has been made in view of the above, and provides a non-contact power transmission unit and a non-contact power transmission system capable of suppressing the radiated magnetic field and suppressing the increase in size of the unit. The purpose.

In order to solve the above-mentioned problems and achieve the object, the non-contact power transmission unit according to the present invention is provided on a preset reference line, and follows a communication unit that transmits or receives a signal and the reference line. It is formed in a spiral shape around each coil axis, has a plurality of coil portions provided around the reference line, and is one of at least one set of adjacent coil portions viewed from a direction along the reference line. The coil portion and the other coil portion are provided with a power transmission coil in which a current flows in a reverse direction around the coil axis and power is transmitted in a non-contact manner.

Further, in the non-contact power transmission unit, it is preferable that the plurality of coil portions are formed by winding one lead wire along a direction orthogonal to the reference line.

Further, in the non-contact power transmission unit, it is preferable that the plurality of coil portions are adjacent to each other in a direction intersecting the reference line.

Further, in the non-contact power transmission unit, the plurality of coil portions are positioned so that their coil axes deviate from the reference line and are adjacent to each other when viewed from a direction along the reference line. Is preferable.

Further, in the non-contact power transmission unit, the power transmission coil is provided with an even number of the plurality of coil portions, and in the combination of all the adjacent coil portions, one coil portion and the other coil portion are provided. It is preferable that currents flow in opposite directions around the coil axis.

Further, in the non-contact power transmission unit, the plurality of coil portions are adjacent to each other when their coil axes are located coaxially with the reference line and are viewed from a direction along the reference line. It is preferable that one of the coil portions is located inside and the other coil portion is located outside.

Further, the non-contact power transmission system according to the present invention includes a non-contact power transmission unit on the transmission side that transmits power in a non-contact manner and a power receiving side that receives power transmitted from the non-contact power transmission unit on the transmission side. A non-contact power transmission unit, and at least one of the non-contact power transmission unit on the transmission side or the non-contact power transmission unit on the power receiving side is provided on a preset reference line to transmit or receive a signal. It has a communication unit and a plurality of coil units formed in a spiral shape around each coil axis along the reference line and provided around the reference line, and at least one set when viewed from a direction along the reference line. One of the coil portions and the other coil portion of the coil portions adjacent to each other have a power transmission coil in which a current flows in a reverse direction around the coil axis and power is transmitted in a non-contact manner. It is characterized by.

The non-contact power transmission unit and the non-contact power transmission system according to the present invention include a communication unit provided on a reference line and a plurality of spiral coil portions provided around the reference line, and adjacent coil portions are mutually connected. Current flows in the opposite direction. As a result, the non-contact power transmission unit and the non-contact power transmission system can suppress the radiated magnetic field, and the communication unit can be provided in the center of the plurality of coil units, so that the size of the unit can be suppressed.

FIG. 1 is a cross-sectional view taken along the line XX of FIG. 2 showing a configuration example of the non-contact power transmission system according to the embodiment. FIG. 2 is a front view showing a configuration example of the non-contact power transmission unit according to the embodiment. FIG. 3 is a conceptual diagram showing a radiated magnetic field of the non-contact power transmission unit according to the embodiment. FIG. 4 is a diagram showing the degree of the radiated magnetic field of the non-contact power transmission unit according to the embodiment. FIG. 5 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 6 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 7 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 8 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 9 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 10 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 11 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 12 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 13 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 14 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 15 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 16 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 17 is a schematic view showing a configuration example of the non-contact power transmission unit according to the first modification. FIG. 18 is a schematic view showing a configuration example of the non-contact power transmission unit according to the second modification. FIG. 19 is a schematic view showing a configuration example of the non-contact power transmission unit according to the second modification. FIG. 20 is a schematic view showing a configuration example of the non-contact power transmission unit according to the modified example 3. FIG. 21 is a schematic view showing a configuration example of the non-contact power transmission unit according to the modified example 3.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions or changes of the configuration can be made without departing from the gist of the present invention.

[Embodiment]
The non-contact power transmission unit 1 and the non-contact power transmission system 100 according to the embodiment will be described. The non-contact power transmission system 100 is a system that non-contactly transmits power from a power source (not shown). The non-contact power transmission system 100 is, for example, mounted on a vehicle and, as shown in FIG. 1, a non-contact power transmission unit 1a on the power transmission side that transmits power in a non-contact manner and a non-contact power transmission unit 1a on the power transmission side. It is provided with a non-contact power transmission unit 1b on the power receiving side that receives the power transmitted from. The non-contact power transmission system 100 is installed so that the non-contact power transmission unit 1a on the power transmission side and the non-contact power transmission unit 1b on the power reception side can communicate and transmit power so as to face each other in the coil axis direction.

The non-contact power transmission units 1a and 1b on the power transmission side and the power reception side include a communication coupler 20 provided on the reference line Za and a plurality of spiral coil portions 31 provided around the reference line Za, and are adjacent to each other. Current flows in the opposite directions of the coil portions 31. As a result, the non-contact power transmission units 1a and 1b on the power transmission side and the power reception side can suppress the radiated magnetic field, and the communication coupler 20 can be provided in the center of the plurality of coil portions 31, so that the unit size is increased. Can be suppressed. Hereinafter, the non-contact power transmission units 1a and 1b on the power transmission side and the power reception side will be described in detail. Since the non-contact power transmission unit 1a on the power transmission side and the non-contact power transmission unit 1b on the power reception side have the same configuration, they are simply referred to as the non-contact power transmission unit 1 unless otherwise specified.

The non-contact power transmission unit 1 is a unit that transmits power in a non-contact manner, and includes a substrate 10, a communication coupler 20 as a communication unit, and a power transmission coil 30. The substrate 10 is formed in the shape of a rectangular flat plate, and contains, for example, ferrite, which is a magnetic material having a high magnetic permeability.

The communication coupler 20 is a device that wirelessly transmits or receives a signal. The communication coupler 20 performs wireless communication using, for example, TransferJet (registered trademark), which is a proximity wireless transfer technology. The communication coupler 20 is provided on a preset reference line Za. Here, the reference line Za is, for example, a line that passes substantially in the center of the substrate 10 perpendicularly to the mounting surface 11 of the substrate 10. As shown in FIG. 2, the communication coupler 20 is provided with a plurality of coil portions 31, which will be described later, around the communication coupler 20. A certain distance is provided between the communication coupler 20 and each coil portion 31. As a result, the communication coupler 20 and each coil portion 31 can be electrically insulated. Further, it is possible to suppress the heat generated in each coil portion 31 from being transferred to the communication coupler 20. Therefore, it is possible to prevent the communication performance of the communication coupler 20 from deteriorating.

The power transmission coil 30 is a coil that transmits power in a non-contact manner. The power transmission coil 30 has a plurality of coil portions 31, for example, four coil portions 31a to 31d (see FIG. 2). In the power transmission coil 30, each coil portion 31a to 31d is formed in a spiral shape around the respective coil axis Zb. Here, the coil axis Zb of each coil portion 31a to 31d is a straight line along the reference line Za. In the power transmission coil 30, the lead wire is wound along a direction orthogonal to the reference line Za (coil axis Zb), and the coil portions 31a to 31d are formed in a plane shape. When viewed from the direction of the reference line Za, the power transmission coil 30 has the coil portions 31a to 31d formed in a rectangular shape and the same size. In the power transmission coil 30, the coil portion 31a and the coil portion 31c face each other, and the coil portion 31b and the coil portion 31d face each other. When viewed from the direction of the reference line Za, the power transmission coil 30 has a rectangular shape on the outer circumference of the power transmission coil 30. In the power transmission coil 30, for example, each coil portion 31a to 31d is formed of one lead wire. That is, in the power transmission coil 30, one lead wire is wound around to form four spiral coil portions 31a to 31d.

In the power transmission coil 30, each coil portion 31a to 31d is provided around the reference line Za. For example, in the power transmission coil 30, each coil portion 31a to 31d is provided around the communication coupler 20 through which the reference line Za passes on the mounting surface 11 of the substrate 10. In other words, in the power transmission coil 30, each coil portion 31a is located when the coil axis Zb of each coil portion 31a to 31d is displaced from the reference line Za and is viewed from the direction along the reference line Za. ~ 31d are adjacent to each other. For example, the power transmission coils 30 are adjacent to each other in the direction in which the coil portions 31a to 31d intersect the reference line Za. Typically, the power transmission coils 30 are adjacent to each other in the orthogonal direction in which the coil portions 31a to 31d are orthogonal to the reference line Za.

In the power transmission coil 30, the coil portion 31a is adjacent to the coil portion 31b, the coil portion 31b is adjacent to the coil portion 31c, the coil portion 31c is adjacent to the coil portion 31d, and the coil portion 31d is adjacent to the coil portion 31a. It is mounted on the mounting surface 11 in the state. When viewed from the mounting surface 11 side, one lead wire of the power transmission coil 30 is wound clockwise from the outside to the inside to form the coil portion 31a, which extends from the end portion of the coil portion 31a. The existing conductor is wound counterclockwise from the outside to the inside to form the coil portion 31b, and the conductor extending from the end of the coil portion 31b is wound clockwise from the outside to the inside. The coil portion 31c is formed, and the lead wire extending from the end portion of the coil portion 31c is wound counterclockwise from the outside to the inside to form the coil portion 31d.

As a result, in the power transmission coil 30, in the adjacent coil portions 31, one coil portion 31 and the other coil portion 31 mutually flow a current in the opposite direction around the coil axis Zb. In the power transmission coil 30, for example, when a plurality of coil portions 31 are provided, one coil portion 31 and the other coil portion 31 are mutually centered on the coil axis Zb in a combination of all adjacent coil portions 31. The current flows in the opposite direction. For example, as shown in FIG. 3, the power transmission coil 30 has a clockwise current flowing through the coil portion 31a and a counterclockwise current flowing through the coil portion 31b adjacent to the coil portion 31a when viewed from the mounting surface 11 side. Flow, a clockwise current flows through the coil portion 31c adjacent to the coil portion 31b, and a counterclockwise current flows through the coil portion 31d adjacent to the coil portion 31c. As a result, in the power transmission coil 30, one coil portion 31 and the other coil portion 31 have different magnetic field directions from each other in the adjacent coil portions 31. For example, in the power transmission coil 30, the direction of the magnetic field generated in the coil portion 31a and the direction of the magnetic field generated in the coil portion 31b adjacent to the coil portion 31a are opposite to each other, and the direction of the magnetic field generated in the coil portion 31b is opposite. The direction and the direction of the magnetic field generated in the coil portion 31c adjacent to the coil portion 31b are opposite to each other, and the direction of the magnetic field generated in the coil portion 31c and the direction of the magnetic field generated in the coil portion 31d adjacent to the coil portion 31c are generated. The direction of the magnetic field is opposite. As a result, in the power transmission coil 30, the directions of the magnetic fields in the adjacent coil portions 31 are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 31 (the direction perpendicular to the reference line Za) can be suppressed (cancellation). it can). FIG. 4 shows a radiation magnetic field of a power transmission coil as a comparative example formed of conductors of the same length, in which the directions of the magnetic fields of adjacent coil portions are all the same, and the power transmission coil 30 of the embodiment. Is an example of comparison. According to FIG. 4, it can be seen that the power transmission coil 30 of the embodiment has a radiation magnetic field suppressed by about 10 dB as compared with the power transmission coil of the comparative example. The radiated magnetic field according to the embodiment is a value measured at a position about 30 cm away from the outer peripheral portion of the power transmission coil 30. Similarly, the radiated magnetic field according to the comparative example is a value measured at a position separated from the outer peripheral portion of the power transmission coil of the comparative example by about 30 cm.

As described above, the non-contact power transmission unit 1 and the non-contact power transmission system 100 according to the embodiment include a communication coupler 20 provided on the reference line Za and a plurality of spiral coils provided around the reference line Za. A portion 31 and adjacent coil portions 31 flow in opposite directions to each other. As a result, in the non-contact power transmission unit 1 and the non-contact power transmission system 100, the directions of the currents flowing through the adjacent coil portions 31 are opposite to each other, so that the directions of the magnetic fields of the adjacent coil portions 31 are opposite to each other. Therefore, the non-contact power transmission unit 1 and the non-contact power transmission system 100 can suppress (cancel) the radiated magnetic field in the arrangement direction (direction perpendicular to the reference line Za) of the coil portions 31a to 31d. As a result, the non-contact power transmission unit 1 and the non-contact power transmission system 100 can suppress the radiation magnetic field from affecting the communication coupler 20 and other devices in the vicinity. Therefore, in the non-contact power transmission unit 1 and the non-contact power transmission system 100, the communication coupler 20 can be provided in the center of the plurality of coil portions 31, so that the size of the unit can be suppressed. Further, in the non-contact power transmission unit 1 and the non-contact power transmission system 100, the communication coupler 20 maintains the central position of the power transmission coil 30 even if the non-contact power transmission unit 1 is rotated around the reference line Za. Therefore, the alignment with the communication coupler 20 on the other side can be facilitated, and the installability of the contact power transmission unit 1 can be improved.

Further, in the non-contact power transmission unit 1, the plurality of coil portions 31 are formed by winding one lead wire along a direction orthogonal to the reference line Za. As a result, the non-contact power transmission unit 1 can pass a current through each of the coil portions 31a to 31d by passing a current through one lead wire.

Further, in the non-contact power transmission unit 1, the plurality of coil portions 31 are adjacent to each other in a direction in which they intersect the reference line Za. As a result, the non-contact power transmission unit 1 can be provided with the coil portions 31a to 31d without the coil portions 31a to 31d overlapping in the direction of the reference line Za.

Further, in the non-contact power transmission unit 1, the plurality of coil portions 31 are positioned so that their coil axis Zb deviates from the reference line Za, and are adjacent to each other when viewed from a direction along the reference line Za. .. As a result, the non-contact power transmission unit 1 can be provided with the coil portions 31a to 31d around the communication coupler 20, so that the size of the unit can be suppressed.

Further, in the non-contact power transmission unit 1, the power transmission coil 30 is provided with an even number of a plurality of coil portions 31, and in the combination of all the adjacent coil portions 31, one coil portion 31 and the other coil portion 31 are provided. Currents flow in opposite directions around the coil axis Zb. As a result, the non-contact power transmission unit 1 can effectively suppress the radiated magnetic field because the direction of the magnetic field is opposite in the combination of all the adjacent coil portions 31.

[Modification 1]
Next, a modification 1 of the embodiment will be described. The non-contact power transmission units 1A to 1M according to the first modification are formed from one conducting wire having the same length as the power transmission coil 30 according to the embodiment, and the shape and number of the coil portions are different. In the power transmission coils 30A to 30M, each coil portion is formed in a spiral shape around the respective coil axis Zb. The power transmission coils 30A to 30M are formed in a flat shape by winding one lead wire along an orthogonal direction orthogonal to the reference line Za (coil axis Zb). Each coil portion of the power transmission coils 30A to 30M is provided around the reference line Za. For example, the power transmission coils 30A to 30M are provided with coil portions on the mounting surface 11 of the substrate 10 around the communication coupler 20. In other words, in the power transmission coils 30A to 30M, the coil axes Zb of each coil portion are located offset from the reference line Za, and the coil portions are mutually when viewed from the direction along the reference line Za. Adjacent to. The power transmission coils 30A to 30M are adjacent to each other in the direction in which the coil portions intersect the reference line Za. Typically, the power transmission coils 30A to 30M are adjacent to each other in the orthogonal direction in which the coil portions are orthogonal to the reference line Za. The non-contact power transmission units 1A to 1M according to the first modification schematically show the shapes of the power transmission coils 30A to 30M, and the description common to the embodiment will be omitted.

For example, in the non-contact power transmission unit 1A shown in FIG. 5, in the power transmission coil 30A, one lead wire is wound around to form two spiral coil portions 32a and 32b. In the power transmission coil 30A, the coil portions 32a and 32b are formed in a rectangular shape and have the same size, and the coil portions 32a and the coil portions 32b face each other. When viewed from the direction of the reference line Za, the power transmission coil 30A has a rectangular shape on the outer circumference of the power transmission coil 30A. The power transmission coil 30A is mounted on the mounting surface 11 in a state where the coil portion 32a and the coil portion 32b are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30A, one lead wire is wound clockwise to form a coil portion 32a, and the lead wire extending from the end of the coil portion 32a is counterclockwise. The coil portion 32b is formed by being wound around.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30A, a clockwise current flows through the coil portion 32a, and a counterclockwise current flows through the coil portion 32b. As a result, in the power transmission coil 30A, the direction of the magnetic field generated in the coil portion 32a and the direction of the magnetic field generated in the coil portion 32b are opposite to each other. As a result, in the power transmission coil 30A, the directions of the magnetic fields in the adjacent coil portions 32a and 32b are opposite to each other, so that the radiation in the alignment direction of the coil portions 32a and 32b (direction perpendicular to the reference line Za) The magnetic field can be suppressed (cancelled). As a result, the power transmission coil 30A can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1B shown in FIG. 6, in the power transmission coil 30B, one lead wire is wound around to form eight spiral coil portions 33a to 33h. In the power transmission coil 30B, each coil portion 33a to 33h has a rectangular shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30B has a rectangular shape on the outer circumference of the power transmission coil 30B. In the power transmission coil 30B, three coil portions 33a to 33h are arranged vertically and horizontally along the circumferential direction of the outer circumference. As shown in FIG. 6, the power transmission coil 30B is mounted on the mounting surface 11 so that the coil portions 33a to 33h are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30B, one lead wire is wound counterclockwise to form a coil portion 33a, and the lead wire extending from the end of the coil portion 33a is a clock. The coil portion 33b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 33b is wound counterclockwise to form the coil portion 33c, and the end portion of the coil portion 33c is formed. The lead wire extending from the coil portion 33d is wound clockwise to form the coil portion 33d, and the lead wire extending from the end portion of the coil portion 33d is wound counterclockwise to form the coil portion 33e. , The lead wire extending from the end of the coil portion 33e is wound clockwise to form the coil portion 33f, and the lead wire extending from the end of the coil portion 33f is wound counterclockwise to form the coil. The portion 33g is formed, and the lead wire extending from the end portion of the coil portion 33g is wound clockwise to form the coil portion 33h.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30B, a counterclockwise current flows through the coil portions 33a, 33c, 33e, 33g, and a clockwise current flows through the coil portions 33b, 33d, 33f, 33h. Flows. As a result, in the power transmission coil 30B, the direction of the magnetic field generated in the coil portion 33a and the direction of the magnetic field generated in the coil portion 33b are opposite to each other, and the direction of the magnetic field generated in the coil portion 33b and the direction of the magnetic field generated in the coil portion 33c are generated. The direction of the magnetic field generated in the coil portion 33c is opposite to that of the magnetic field generated in the coil portion 33c, and the direction of the magnetic field generated in the coil portion 33d is opposite to the direction of the magnetic field generated in the coil portion 33d. The direction of the magnetic field generated in the coil unit 33e is opposite to that of the magnetic field generated in the coil unit 33e, and the direction of the magnetic field generated in the coil unit 33f is opposite to the direction of the magnetic field generated in the coil unit 33f. The direction of the magnetic field generated in the coil portion 33g is opposite to that of the magnetic field generated in the coil portion 33g, and the direction of the magnetic field generated in the coil portion 33h is opposite to that of the magnetic field generated in the coil portion 33h. And the direction of the magnetic field generated in the coil portion 33a are opposite to each other. As a result, in the power transmission coil 30B, the directions of the magnetic fields in the adjacent coil portions 33a to 33h are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 33a to 33h can be suppressed. As a result, the power transmission coil 30B can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1C shown in FIG. 7, in the power transmission coil 30C, one lead wire is wound around to form two spiral coil portions 34a and 34b. In the power transmission coil 30C, the coil portions 34a and 34b are formed in a triangular shape and have the same size, and the coil portions 34a and the coil portions 34b face each other. When viewed from the direction of the reference line Za, the power transmission coil 30C has a rectangular shape on the outer circumference of the power transmission coil 30C. The power transmission coil 30C is mounted on the mounting surface 11 in a state where the coil portion 34a and the coil portion 34b are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30C, one lead wire is wound clockwise to form the coil portion 34a, and the lead wire extending from the end portion of the coil portion 34a is counterclockwise. The coil portion 34b is formed by being wound around.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30C, a clockwise current flows through the coil portion 34a, and a counterclockwise current flows through the coil portion 34b. As a result, in the power transmission coil 30C, the direction of the magnetic field generated in the coil portion 34a and the direction of the magnetic field generated in the coil portion 34b are opposite to each other. As a result, in the power transmission coil 30C, the directions of the magnetic fields in the adjacent coil portions 34a and 34b are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 34a and 34b can be suppressed. As a result, the power transmission coil 30C can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1D shown in FIG. 8, one lead wire is wound around the power transmission coil 30D to form four spiral coil portions 35a to 35d. In the power transmission coil 30D, each coil portion 35a to 35d has a trapezoidal shape and is formed to have the same size. When viewed from the direction of the reference line Za, the power transmission coil 30D has a rectangular shape on the outer circumference of the power transmission coil 30D. In the power transmission coil 30D, the coil portion 35a and the coil portion 35c face each other, and the coil portion 35b and the coil portion 35d face each other. As shown in FIG. 8, the power transmission coil 30D is mounted on the mounting surface 11 so that the coil portions 35a to 35d are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30D, one lead wire is wound clockwise to form a coil portion 35a, and the lead wire extending from the end portion of the coil portion 35a is counterclockwise. The coil portion 35b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 35b is wound clockwise to form the coil portion 35c, and is formed from the end portion of the coil portion 35c. The extending lead wire is wound counterclockwise to form the coil portion 35d.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30D, a clockwise current flows through the coil portions 35a and 35c, and a counterclockwise current flows through the coil portions 35b and 35d. As a result, in the power transmission coil 30D, the direction of the magnetic field generated in the coil portion 35a and the direction of the magnetic field generated in the coil portion 35b are opposite to each other, and the direction of the magnetic field generated in the coil portion 35b and the direction of the magnetic field generated in the coil portion 35c are generated. The direction of the magnetic field generated in the coil portion 35c is opposite to that of the magnetic field generated in the coil portion 35c, and the direction of the magnetic field generated in the coil portion 35d is opposite to the direction of the magnetic field generated in the coil portion 35d. The direction of the magnetic field generated in is opposite. As a result, in the power transmission coil 30D, the directions of the magnetic fields in the adjacent coil portions 35a to 35d are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 35a to 35d can be suppressed. As a result, the power transmission coil 30D can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1E shown in FIG. 9, in the power transmission coil 30E, one lead wire is wound around to form eight spiral coil portions 36a to 36h. In the power transmission coil 30E, each coil portion 36a to 36h has a trapezoidal shape and is formed to have the same size. When viewed from the direction of the reference line Za, the power transmission coil 30E has a rectangular shape on the outer circumference of the power transmission coil 30E. In the power transmission coil 30E, the coil portions 36a to 36h are arranged along the circumferential direction of the outer circumference. As shown in FIG. 9, the power transmission coil 30E is mounted on the mounting surface 11 so that the coil portions 36a to 36h are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30E, one lead wire is wound clockwise to form the coil portion 36a, and the lead wire extending from the end of the coil portion 36a is counterclockwise. The coil portion 36b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 36b is wound clockwise to form the coil portion 36c, and is formed from the end portion of the coil portion 36c. The extending wire is wound counterclockwise to form the coil portion 36d, and the wire extending from the end of the coil portion 36d is wound clockwise to form the coil portion 36e. The lead wire extending from the end of the coil portion 36e is wound counterclockwise to form the coil portion 36f, and the lead wire extending from the end portion of the coil portion 36f is wound clockwise to form the coil portion 36f. 36g is formed, and the lead wire extending from the end of the coil portion 36g is wound counterclockwise to form the coil portion 36h.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30E, a clockwise current flows through the coil portions 36a, 36c, 36e, 36g, and the coil portions 36b, 36d, 36f, 36h are counterclockwise. Current flows. As a result, in the power transmission coil 30E, the direction of the magnetic field generated in the coil portion 36a and the direction of the magnetic field generated in the coil portion 36b are opposite to each other, and the direction of the magnetic field generated in the coil portion 36b and the direction of the magnetic field generated in the coil portion 36c are generated. The direction of the magnetic field generated in the coil portion 36c is opposite to that of the magnetic field generated in the coil portion 36c, and the direction of the magnetic field generated in the coil portion 36d is opposite to that of the magnetic field generated in the coil portion 36d. The direction of the magnetic field generated in the coil portion 36e is opposite to that of the magnetic field generated in the coil portion 36e, and the direction of the magnetic field generated in the coil portion 36f is opposite to that of the magnetic field generated in the coil portion 36f. The direction of the magnetic field generated in the coil portion 36g is opposite to that of the magnetic field generated in the coil portion 36g, and the direction of the magnetic field generated in the coil portion 36h is opposite to that of the magnetic field generated in the coil portion 36h. And the direction of the magnetic field generated in the coil portion 36a are opposite to each other. As a result, in the power transmission coil 30E, the directions of the magnetic fields in the adjacent coil portions 36a to 36h are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 36a to 36h can be suppressed. As a result, the power transmission coil 30E can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1F shown in FIG. 10, in the power transmission coil 30F, one lead wire is wound around to form four spiral coil portions 37a to 37d. The power transmission coil 30F is formed so that each coil portion 37a to 37d has a rectangular shape and includes different sizes. In the power transmission coil 30F, the coil portion 37a and the coil portion 37c having the same shape face each other, and the coil portion 37b and the coil portion 37d having the same shape face each other. When viewed from the direction of the reference line Za, the power transmission coil 30F has a rectangular shape on the outer circumference of the power transmission coil 30F. As shown in FIG. 10, the power transmission coil 30F is mounted on the mounting surface 11 so that the coil portions 37a to 37d are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30F, one lead wire is wound clockwise to form the coil portion 37a, and the lead wire extending from the end of the coil portion 37a is counterclockwise. The coil portion 37b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 37b is wound clockwise to form the coil portion 37c, and is formed from the end portion of the coil portion 37c. The extending lead wire is wound counterclockwise to form the coil portion 37d.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30F, a clockwise current flows through the coil portions 37a and 37c, and a counterclockwise current flows through the coil portions 37b and 37d. As a result, in the power transmission coil 30F, the direction of the magnetic field generated in the coil portion 37a and the direction of the magnetic field generated in the coil portion 37b are opposite to each other, and the direction of the magnetic field generated in the coil portion 37b and the direction of the magnetic field generated in the coil portion 37c are generated. The direction of the magnetic field generated in the coil portion 37c is opposite to that of the magnetic field generated in the coil portion 37c, and the direction of the magnetic field generated in the coil portion 37d is opposite to that of the magnetic field generated in the coil portion 37d. The direction of the magnetic field generated in is opposite. As a result, in the power transmission coil 30F, the directions of the magnetic fields in the adjacent coil portions 37a to 37d are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 37a to 37d can be suppressed. As a result, the power transmission coil 30F can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1G shown in FIG. 11, in the power transmission coil 30G, one lead wire is wound around to form 12 spiral coil portions 38a to 38m. In the power transmission coil 30G, each coil portion 38a to 38m has a rectangular shape or a triangular shape, and is formed to have the same shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30G has a rectangular shape on the outer circumference of the power transmission coil 30G. In the power transmission coil 30G, each coil portion 38a to 38m is arranged along the circumferential direction of the outer circumference. For example, as shown in FIG. 11, the power transmission coil 30G is mounted on the mounting surface 11 so that the coil portions 38a to 38m are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30G, one lead wire is wound counterclockwise to form a coil portion 38a, and the lead wire extending from the end of the coil portion 38a is a clock. The coil portion 38b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 38b is wound counterclockwise to form the coil portion 38c, and the end portion of the coil portion 38c is formed. The lead wire extending from the coil portion 38d is wound clockwise to form the coil portion 38d, and the lead wire extending from the end portion of the coil portion 38d is wound counterclockwise to form the coil portion 38e. , The lead wire extending from the end of the coil portion 38e is wound clockwise to form the coil portion 38f, and the lead wire extending from the end of the coil portion 38f is wound counterclockwise to form the coil. The portion 38g is formed, and the lead wire extending from the end of the coil portion 38g is wound clockwise to form the coil portion 38h, and the lead wire extending from the end of the coil portion 38h is counterclockwise. The coil portion 38i is formed by being wound around, and the lead wire extending from the end portion of the coil portion 38i is wound clockwise to form the coil portion 38j, and is formed from the end portion of the coil portion 38j. The extending wire is wound counterclockwise to form the coil portion 38k, and the wire extending from the end of the coil portion 38k is wound clockwise to form the coil portion 38m.

As a result, when the power transmission coil 30G is viewed from the mounting surface 11 side, a counterclockwise current flows through the coil portions 38a, 38c, 38e, 38g, 38i, 38k, and the coil portions 38b, 38d, 38f, 38h, A clockwise current flows through 38j and 38m.

As a result, in the power transmission coil 30G, the direction of the magnetic field generated in the coil portion 38a and the direction of the magnetic field generated in the coil portion 38b are opposite to each other, and the direction of the magnetic field generated in the coil portion 38b and the direction of the magnetic field generated in the coil portion 38c are generated. The direction of the magnetic field generated in the coil portion 38c is opposite to that of the magnetic field generated in the coil portion 38c, and the direction of the magnetic field generated in the coil portion 38d is opposite to that of the magnetic field generated in the coil portion 38d. The direction of the magnetic field generated in the coil portion 38e is opposite to that of the magnetic field generated in the coil portion 38e, and the direction of the magnetic field generated in the coil portion 38f is opposite to that of the magnetic field generated in the coil portion 38f. The direction of the magnetic field generated in the coil portion 38g is opposite to that of the magnetic field generated in the coil portion 38g, and the direction of the magnetic field generated in the coil portion 38h is opposite to that of the magnetic field generated in the coil portion 38h. The direction of the magnetic field generated in the coil portion 38i is opposite to that of the magnetic field generated in the coil portion 38i, and the direction of the magnetic field generated in the coil portion 38i is opposite to that of the magnetic field generated in the coil portion 38j. The direction of the magnetic field generated in the coil portion 38k is opposite to that of the magnetic field generated in the coil portion 38k, and the direction of the magnetic field generated in the coil portion 38k is opposite to the direction of the magnetic field generated in the coil portion 38m. The direction of the magnetic field generated and the direction of the magnetic field generated in the coil portion 38a are opposite to each other. As a result, in the power transmission coil 30G, the directions of the magnetic fields in the adjacent coil portions 38a to 38m are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 38a to 38m can be suppressed. As a result, the power transmission coil 30G can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1H shown in FIG. 12, in the power transmission coil 30H, one lead wire is wound around to form eight spiral coil portions 39a to 39h. In the power transmission coil 30H, each coil portion 39a to 39h has a triangular or trapezoidal shape, and is formed to have the same shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30H has a rectangular shape on the outer circumference of the power transmission coil 30H. In the power transmission coil 30H, the coil portions 39a to 39h are alternately arranged with triangular coil portions 39a and the like and trapezoidal coil portions 39b and the like along the circumferential direction of the outer circumference. For example, as shown in FIG. 12, the power transmission coil 30H is mounted on the mounting surface 11 so that the coil portions 39a to 39h are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30H, one lead wire is wound counterclockwise to form a coil portion 39a, and the lead wire extending from the end of the coil portion 39a is a clock. The coil portion 39b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 39b is wound counterclockwise to form the coil portion 39c, and the end portion of the coil portion 39c is formed. The lead wire extending from the coil portion 39d is wound clockwise to form the coil portion 39d, and the lead wire extending from the end portion of the coil portion 39d is wound counterclockwise to form the coil portion 39e. , The lead wire extending from the end of the coil portion 39e is wound clockwise to form the coil portion 39f, and the lead wire extending from the end of the coil portion 39f is wound counterclockwise to form the coil. The portion 39g is formed, and the lead wire extending from the end portion of the coil portion 39g is wound clockwise to form the coil portion 39h.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30H, a counterclockwise current flows through the coil portions 39a, 39c, 39e, 39g, and a clockwise current flows through the coil portions 39b, 39d, 39f, 39h. Flows. As a result, in the power transmission coil 30H, the direction of the magnetic field generated in the coil portion 39a and the direction of the magnetic field generated in the coil portion 39b are opposite to each other, and the direction of the magnetic field generated in the coil portion 39b and the direction of the magnetic field generated in the coil portion 39c are generated. The direction of the magnetic field generated is opposite to that of the magnetic field generated in the coil portion 39c, and the direction of the magnetic field generated in the coil portion 39d is opposite to the direction of the magnetic field generated in the coil portion 39d. The direction of the magnetic field generated in the coil portion 39e is opposite to that of the magnetic field generated in the coil portion 39e, and the direction of the magnetic field generated in the coil portion 39f is opposite to the direction of the magnetic field generated in the coil portion 39f. The direction of the magnetic field generated in the coil portion 39g is opposite to that of the magnetic field generated in the coil portion 39g, and the direction of the magnetic field generated in the coil portion 39h is opposite to the direction of the magnetic field generated in the coil portion 39h. And the direction of the magnetic field generated in the coil portion 39a are opposite to each other. As a result, in the power transmission coil 30H, the directions of the magnetic fields in the adjacent coil portions 39a to 39h are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 39a to 39h can be suppressed. As a result, the power transmission coil 30H can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1I shown in FIG. 13, in the power transmission coil 30I, one lead wire is wound around to form two spiral coil portions 310a and 310b. In the power transmission coil 30I, the coil portions 310a and 310b are formed in a semicircular shape and have the same size, and the coil portions 310a and the coil portions 310b face each other. The power transmission coil 30I has a circular outer peripheral shape when viewed from the direction of the reference line Za. The power transmission coil 30I is mounted on the mounting surface 11 in a state where the coil portion 310a and the coil portion 310b are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30I, one lead wire is wound counterclockwise to form a coil portion 310a, and the lead wire extending from the end of the coil portion 310a is a clock. The coil portion 310b is formed by being wound around.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30I, a counterclockwise current flows through the coil portion 310a, and a clockwise current flows through the coil portion 310b. As a result, in the power transmission coil 30I, the direction of the magnetic field generated in the coil portion 310a and the direction of the magnetic field generated in the coil portion 310b are opposite to each other. As a result, in the power transmission coil 30I, the directions of the magnetic fields in the adjacent coil portions 310a and 310b are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 310a and 310b can be suppressed. As a result, the power transmission coil 30I can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1J shown in FIG. 14, one lead wire is wound around the power transmission coil 30J to form four spiral coil portions 320a to 320d. In the power transmission coil 30J, the coil portions 320a to 320d are formed in a fan shape and have the same size, the coil portions 320a and the coil portions 320c face each other, and the coil portions 320b and the coil portions 320d face each other. When viewed from the direction of the reference line Za, the power transmission coil 30J has a circular outer peripheral shape. As shown in FIG. 14, the power transmission coil 30J is mounted on the mounting surface 11 so that the coil portions 320a to 320d are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30J, one lead wire is wound clockwise to form the coil portion 320a, and the lead wire extending from the end of the coil portion 320a is counterclockwise. The coil portion 320b is formed by being wound around, and the lead wire extending from the end of the coil portion 320b is wound clockwise to form the coil portion 320c, from the end of the coil portion 320c. The extending lead wire is wound counterclockwise to form the coil portion 320d.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30J, a clockwise current flows through the coil portions 320a and 320c, and a counterclockwise current flows through the coil portions 320b and 320d. As a result, in the power transmission coil 30J, the direction of the magnetic field generated in the coil portion 320a and the direction of the magnetic field generated in the coil portion 320b are opposite to each other, and the direction of the magnetic field generated in the coil portion 320b and the direction of the magnetic field generated in the coil portion 320c are generated. The direction of the magnetic field generated in the coil portion 320c is opposite to that of the magnetic field generated in the coil portion 320c, and the direction of the magnetic field generated in the coil portion 320d is opposite to the direction of the magnetic field generated in the coil portion 320d. The direction of the magnetic field generated in is opposite. As a result, in the power transmission coil 30J, the directions of the magnetic fields in the adjacent coil portions 320a to 320d are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 320a to 320d can be suppressed. As a result, the power transmission coil 30J can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1K shown in FIG. 15, in the power transmission coil 30K, one lead wire is wound around to form eight spiral coil portions 330a to 330h. In the power transmission coil 30K, each coil portion 330a to 330h is formed in a fan shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30K has a circular outer peripheral shape. In the power transmission coil 30K, each coil portion 330a to 330h is arranged along the circumferential direction of the outer circumference. As shown in FIG. 15, the power transmission coil 30K is mounted on the mounting surface 11 so that the coil portions 330a to 330h are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30K, one lead wire is wound counterclockwise to form a coil portion 330a, and the lead wire extending from the end of the coil portion 330a is a clock. The coil portion 330b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 330b is wound counterclockwise to form the coil portion 330c, and the end portion of the coil portion 330c is formed. The lead wire extending from the coil portion 330d is wound clockwise to form the coil portion 330d, and the lead wire extending from the end portion of the coil portion 330d is wound counterclockwise to form the coil portion 330e. , The lead wire extending from the end of the coil portion 330e is wound clockwise to form the coil portion 330f, and the lead wire extending from the end of the coil portion 330f is wound counterclockwise to form the coil. The portion 330g is formed, and the lead wire extending from the end of the coil portion 330g is wound clockwise to form the coil portion 330h.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30K, a counterclockwise current flows through the coil portions 330a, 330c, 330e, and 330g, and a clockwise current flows through the coil portions 330b, 330d, 330f, and 330h. Flows. As a result, in the power transmission coil 30K, the direction of the magnetic field generated in the coil portion 330a and the direction of the magnetic field generated in the coil portion 330b are opposite to each other, and the direction of the magnetic field generated in the coil portion 330b and the direction of the magnetic field generated in the coil portion 330c are generated in the coil portion 330c. The direction of the magnetic field generated in the coil portion 330c is opposite to that of the magnetic field generated in the coil portion 330c, and the direction of the magnetic field generated in the coil portion 330d is opposite to the direction of the magnetic field generated in the coil portion 330d. The direction of the magnetic field generated in the coil unit 330e is opposite to that of the magnetic field generated in the coil unit 330e, and the direction of the magnetic field generated in the coil unit 330f is opposite to the direction of the magnetic field generated in the coil unit 330f. The direction of the magnetic field generated in the coil portion 330g is opposite to that of the magnetic field generated in the coil portion 330g, and the direction of the magnetic field generated in the coil portion 330h is opposite to that of the magnetic field generated in the coil portion 330h. And the direction of the magnetic field generated in the coil portion 330a are opposite to each other. As a result, in the power transmission coil 30K, the directions of the magnetic fields in the adjacent coil portions 330a to 330h are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 330a to 330h can be suppressed. As a result, the power transmission coil 30K can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1L shown in FIG. 16, in the power transmission coil 30L, one lead wire is wound around to form three spiral coil portions 340a to 340c. In the power transmission coil 30L, each coil portion 340a to 340c is formed in a diamond shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30L has a polygonal shape, for example, a regular hexagonal shape on the outer circumference of the power transmission coil 30L. In the power transmission coil 30L, the coil portions 340a to 340c are arranged so that the outer peripheral shape has a regular hexagonal shape. As shown in FIG. 16, the power transmission coil 30L is mounted on the mounting surface 11 so that the coil portions 340a to 340c are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30L, one lead wire is wound counterclockwise to form a coil portion 340a, and the lead wire extending from the end of the coil portion 340a is a clock. The coil portion 340b is formed by being wound around, and the lead wire extending from the end of the coil portion 340b is wound clockwise to form the coil portion 340c.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30L, a counterclockwise current flows through the coil portion 340a, and a clockwise current flows through the coil portions 340b and 340c. As a result, in the power transmission coil 30L, the direction of the magnetic field generated in the coil portion 340a and the direction of the magnetic field generated in the coil portion 340b are opposite to each other, and the direction of the magnetic field generated in the coil portion 340b and the direction of the magnetic field generated in the coil portion 340c are generated. The direction of the magnetic field is the same, and the direction of the magnetic field generated in the coil portion 340c and the direction of the magnetic field generated in the coil portion 340a are opposite. As a result, in the power transmission coil 30L, the directions of the magnetic fields at the adjacent coil portions 340a and 340b, and the coil portions 340a and the coil portion 340c are opposite to each other, so that the radiation in the alignment direction of the coil portions 340a to 340c The magnetic field can be suppressed. As a result, the power transmission coil 30L can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1M shown in FIG. 17, one lead wire is wound around the power transmission coil 30M to form six spiral coil portions 350a to 350f. In the power transmission coil 30M, each coil portion 350a to 350f is formed in a triangular shape and the same size. When viewed from the direction of the reference line Za, the power transmission coil 30M has a polygonal shape, for example, a regular hexagonal shape on the outer circumference of the power transmission coil 30M. In the power transmission coil 30M, each coil portion 350a to 350f is arranged along the circumferential direction of the outer circumference. As shown in FIG. 17, the power transmission coil 30M is mounted on the mounting surface 11 so that the coil portions 350a to 350f are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30M, one lead wire is wound counterclockwise to form a coil portion 350a, and the lead wire extending from the end of the coil portion 350a is a clock. The coil portion 350b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 350b is wound counterclockwise to form the coil portion 350c, and the end portion of the coil portion 350c is formed. The lead wire extending from is wound clockwise to form the coil portion 350d, and the lead wire extending from the end of the coil portion 350d is wound counterclockwise to form the coil portion 350e. , The lead wire extending from the end of the coil portion 350e is wound clockwise to form the coil portion 350f.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30M, a counterclockwise current flows through the coil portions 350a, 350c, 350e, and a clockwise current flows through the coil portions 350b, 350d, 350f. As a result, in the power transmission coil 30M, the direction of the magnetic field generated in the coil portion 350a and the direction of the magnetic field generated in the coil portion 350b are opposite to each other, and the direction of the magnetic field generated in the coil portion 350b and the direction of the magnetic field generated in the coil portion 350c are generated. The direction of the magnetic field generated in the coil portion 350c is opposite to that of the magnetic field generated in the coil portion 350c, and the direction of the magnetic field generated in the coil portion 350d is opposite to the direction of the magnetic field generated in the coil portion 350d. The direction of the magnetic field generated in the coil unit 350e is opposite to that of the magnetic field generated in the coil unit 350e, and the direction of the magnetic field generated in the coil unit 350f is opposite to the direction of the magnetic field generated in the coil unit 350f. The direction of the magnetic field generated in the portion 350a is opposite to that of the direction. As a result, in the power transmission coil 30M, the directions of the magnetic fields in the adjacent coil portions 350a to 350f are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 350a to 350f can be suppressed. As a result, the power transmission coil 30M can suppress the radiated magnetic field that affects the communication coupler 20.

[Modification 2]
Next, a modification 2 of the embodiment will be described. The non-contact power transmission units 1N and 1P according to the second modification are formed from one conducting wire having the same length as the power transmission coil 30 according to the embodiment, and the shape and number of the coil portions are different. In the power transmission coils 30N and 30P, each coil portion is formed in a spiral shape around the respective coil axis Zb. The power transmission coils 30N and 30P are formed in a flat shape by winding one lead wire along an orthogonal direction orthogonal to the reference line Za (coil axis Zb). Each coil portion of the power transmission coils 30N and 30P is provided around the reference line Za. For example, the power transmission coils 30N and 30P are provided with coil portions on the mounting surface 11 around the communication coupler 20 through which the reference line Za passes. In other words, in the power transmission coils 30N and 30P, the plurality of coil portions are formed in an annular shape with different sizes, and the respective coil axis Zb is located coaxially with the reference line Za. When viewed from the direction along the reference line Za, the plurality of coil portions have one coil portion located inside and the other coil portion located outside in the adjacent coil portions. The power transmission coils 30N and 30P are adjacent to each other in the direction in which the coil portions intersect the reference line Za. Typically, the power transmission coils 30N and 30P are adjacent to each other in the orthogonal direction in which the coil portions are orthogonal to the reference line Za. The non-contact power transmission units 1N and 1P according to the second modification schematically show the shapes of the power transmission coils 30N and 30P, and the description common to the embodiment will be omitted.

For example, in the non-contact power transmission unit 1N shown in FIG. 18, in the power transmission coil 30N, one lead wire is wound around to form two spiral coil portions 360a and 360b. In the power transmission coil 30N, the coil axis Zb of each of the coil portions 360a and 360b is located coaxially with the reference line Za. In the power transmission coil 30N, each coil portion 360a and 360b are formed in a rectangular ring shape, and are formed in different sizes. For example, in the power transmission coil 30N, the coil portion 360a is formed smaller than the coil portion 360b, and the coil portion 360a is located inside the coil portion 360b. In the power transmission coil 30N, the communication coupler 20 is located inside the coil portion 360a. When viewed from the direction of the reference line Za, the power transmission coil 30N has a rectangular shape on the outer circumference of the power transmission coil 30N. The power transmission coil 30N is mounted on the mounting surface 11 in a state where the coil portion 360a and the coil portion 360b are adjacent to each other on the inside and the outside. When viewed from the mounting surface 11 side of the power transmission coil 30N, one lead wire is wound clockwise to form a coil portion 360a, and the lead wire extending from the end of the coil portion 360a is counterclockwise. The coil portion 360b is formed by being wound around.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30N, a clockwise current flows through the coil portion 360a, and a counterclockwise current flows through the coil portion 360b. As a result, in the power transmission coil 30N, the direction of the magnetic field generated in the coil portion 360a and the direction of the magnetic field generated in the coil portion 360b are opposite to each other. As a result, in the power transmission coil 30N, the directions of the magnetic fields in the adjacent coil portions 360a and 360b are opposite to each other, so that the radiated magnetic field in the alignment direction of the coil portions 360a and 360b can be suppressed. As a result, the power transmission coil 30N can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1P shown in FIG. 19, one lead wire is wound around the power transmission coil 30P to form four spiral coil portions 370a to 370d. In the power transmission coil 30P, the coil axis Zb of the coil portions 370a to 370d is located coaxially with the reference line Za. In the power transmission coil 30P, each coil portion 370a to 370d is formed in a rectangular ring shape and is formed in a different size. For example, in the power transmission coil 30P, the coil portion 370a is formed smaller than the coil portion 370b, the coil portion 370b is formed smaller than the coil portion 370c, and the coil portion 370c is formed smaller than the coil portion 370d. In the power transmission coil 30P, the coil portion 370a is located inside the coil portion 370b, the coil portion 370b is located inside the coil portion 370c, and the coil portion 370c is located inside the coil portion 370d. In the power transmission coil 30P, the communication coupler 20 is located inside the coil portion 370a. When viewed from the direction of the reference line Za, the power transmission coil 30P has a rectangular shape on the outer circumference of the power transmission coil 30P. As shown in FIG. 19, the power transmission coil 30P is mounted on the mounting surface 11 so that the coil portions 370a to 370d are adjacent to each other on the inner side and the outer side, respectively. When viewed from the mounting surface 11 side of the power transmission coil 30P, one lead wire is wound clockwise to form a coil portion 370a, and the lead wire extending from the end portion of the coil portion 370a is counterclockwise. The coil portion 370b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 370b is wound clockwise to form the coil portion 370c, and is formed from the end portion of the coil portion 370c. The extending lead wire is wound counterclockwise to form the coil portion 370d.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30P, a clockwise current flows through the coil portions 370a and 370c, and a counterclockwise current flows through the coil portions 370b and 370d. As a result, in the power transmission coil 30P, the direction of the magnetic field generated in the coil portion 370a and the direction of the magnetic field generated in the coil portion 370b are opposite to each other, and the direction of the magnetic field generated in the coil portion 370b and the direction of the magnetic field generated in the coil portion 370c are generated. The direction of the magnetic field generated is opposite to that of the magnetic field generated in the coil portion 370c, and the direction of the magnetic field generated in the coil portion 370d is opposite to that of the coil portion 370d. As a result, in the power transmission coil 30P, the directions of the magnetic fields in the adjacent coil portions 370a to 370d are opposite to each other, so that the radiated magnetic field in the arrangement direction of the coil portions 370a to 370d can be suppressed. As a result, the power transmission coil 30P can suppress the radiated magnetic field that affects the communication coupler 20.

[Modification 3]
Next, a modification 3 of the embodiment will be described. The non-contact power transmission units 1Q and 1R according to the third modification are formed of one conducting wire having the same length as the power transmission coil 30 according to the embodiment, and the shape and number of the coil portions are different. The non-contact power transmission units 1Q and 1R according to the third modification have a coil portion in which the coil axis Zb is located coaxially with the reference line Za and a coil portion in which the coil axis Zb is located on an axis different from the reference line Za. Includes both. The non-contact power transmission units 1Q and 1R according to the third modification schematically show the shapes of the power transmission coils 30Q and 30R, and the description common to the embodiment will be omitted.

For example, in the non-contact power transmission unit 1Q shown in FIG. 20, in the power transmission coil 30Q, one lead wire is wound around to form five spiral coil portions 380a to 380e. In the power transmission coil 30Q, the coil axis Zb of the coil portion 380a is located coaxially with the reference line Za, and the coil axis Zb of the coil portions 380b to 380e is located on an axis different from the reference line Za. In the power transmission coil 30Q, the coil portions 380a are formed in a rectangular ring shape, and the coil portions 380b to 380e are formed in a rectangular shape. When viewed from the direction of the reference line Za, the power transmission coil 30Q has a rectangular shape on the outer circumference of the power transmission coil 30Q. In the power transmission coil 30Q, the coil portion 380b and the coil portion 380d face each other with the coil portion 380a interposed therebetween, and the coil portion 380c and the coil portion 380e face each other with the coil portion 380a interposed therebetween. As shown in FIG. 20, the power transmission coil 30Q is mounted on the mounting surface 11 so that the coil portions 380a and the coil portions 380b to 380e are adjacent to each other. Further, the power transmission coil 30Q is mounted on the mounting surface 11 so that the coil portions 380b to 370e are adjacent to each other. When viewed from the mounting surface 11 side of the power transmission coil 30Q, one lead wire is wound clockwise to form a coil portion 380a, and the lead wire extending from the end of the coil portion 380a is counterclockwise. The coil portion 380b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 380b is wound counterclockwise to form the coil portion 380c, and the end portion of the coil portion 380c is formed. The lead wire extending from is wound counterclockwise to form the coil portion 380d, and the lead wire extending from the end of the coil portion 380d is wound counterclockwise to form the coil portion 380e. There is.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30Q, a clockwise current flows through the coil portions 380a, and a counterclockwise current flows through the coil portions 380b to 380e. As a result, in the power transmission coil 30Q, the direction of the magnetic field generated in the coil portion 380a and the direction of the magnetic field generated in each of the coil portions 380b to 380e are opposite to each other. As a result, in the power transmission coil 30Q, the directions of the magnetic fields in the adjacent coil portions 380a and the respective coil portions 380b to 380e are opposite to each other, so that the radiation in the alignment direction of the coil portions 380a and the respective coil portions 380b to 380e The magnetic field can be suppressed. As a result, the power transmission coil 30Q can suppress the radiated magnetic field that affects the communication coupler 20.

Further, in the non-contact power transmission unit 1R shown in FIG. 21, one lead wire is wound around the power transmission coil 30R to form 13 spiral coil portions 390a to 390n. In the power transmission coil 30R, the coil axis Zb of the coil portion 390a is located coaxially with the reference line Za, and the coil axis Zb of the coil portions 390b to 390n is located on an axis different from the reference line Za. In the power transmission coil 30R, the coil portion 390a is formed in a rectangular ring shape, and each coil portion 390b to 390n is formed in a rectangular shape. When viewed from the direction of the reference line Za, the power transmission coil 30R has a rectangular shape on the outer circumference of the power transmission coil 30R. In the power transmission coil 30R, the annular coil portion 390a is arranged in the center, and the coil portions 390b to 390n are arranged around the annular coil portion 390a. As shown in FIG. 21, the power transmission coil 30R is mounted on the mounting surface 11 so that the coil portions 390a and the coil portions 390b to 390n are adjacent to each other. Further, the power transmission coil 30R is mounted on the mounting surface 11 so that the coil portions 390b to 390n are adjacent to each other.

When viewed from the mounting surface 11 side of the power transmission coil 30R, one lead wire is wound clockwise to form a coil portion 390a, and the lead wire extending from the end of the coil portion 390a is counterclockwise. The coil portion 390b is formed by being wound around, and the lead wire extending from the end portion of the coil portion 390b is wound counterclockwise to form the coil portion 390c, and the end portion of the coil portion 390c is formed. The lead wire extending from is wound counterclockwise to form the coil portion 390d, and the lead wire extending from the end of the coil portion 390d is wound counterclockwise to form the coil portion 390e. The lead wire extending from the end of the coil portion 390e is wound counterclockwise to form the coil portion 390f, and the lead wire extending from the end of the coil portion 390f is wound counterclockwise. The coil portion 390 g is formed, and the lead wire extending from the end portion of the coil portion 390 g is wound counterclockwise to form the coil portion 390 h, and the lead wire extending from the end portion of the coil portion 390 h is formed. Is wound counterclockwise to form the coil portion 390i, and the lead wire extending from the end of the coil portion 390i is wound counterclockwise to form the coil portion 390j, and the coil portion 390j is formed. The lead wire extending from the end of the coil portion is wound counterclockwise to form the coil portion 390k, and the lead wire extending from the end portion of the coil portion 390k is wound counterclockwise to form the coil portion 390 m. The coil portion 390n is formed by winding the lead wire extending from the end portion of the coil portion 390m counterclockwise.

As a result, when viewed from the mounting surface 11 side of the power transmission coil 30R, a clockwise current flows through the coil portions 390a, and a counterclockwise current flows through the coil portions 390b to 390n. As a result, in the power transmission coil 30R, the direction of the magnetic field generated in the coil portion 390a and the direction of the magnetic field generated in each of the coil portions 390b to 390n are opposite to each other. As a result, in the power transmission coil 30R, the directions of the magnetic fields of the adjacent coil portions 390a and the coil portions 390b to 390n are opposite to each other, so that the coil portions 390a and the coil portions 390b to 390n are radiated in the alignment direction. The magnetic field can be suppressed. As a result, the power transmission coil 30R can suppress the radiated magnetic field that affects the communication coupler 20.

The plurality of coil portions 31 and the like may not be formed from one lead wire, or may be formed from a plurality of lead wires. In this case, a current is passed through each lead wire at the same time.

Further, the plurality of coil portions 31 and the like may have lead wires laminated in the coil axis Zb direction and wound in two or more stages in a plane shape. Further, the number of the plurality of coil portions 31 and the like is not limited to the illustrated number.

Further, the non-contact power transmission system 100 may include, at least one of the non-contact power transmission units on the power transmission side or the power reception side, a power transmission coil 30 or the like in which a current flows in the reverse direction in the adjacent coil portions 31 or the like. ..

1-1R Non-contact power transmission unit 20 Communication coupler (communication unit)
30 to 30R Power transmission coil 31-390n Coil unit 100 Non-contact power transmission system Za Reference line Zb Coil axis

Claims (5)

A communication unit that is provided on a preset reference line and transmits or receives signals.
The coil portion formed in a spiral shape around each coil axis along the reference line, has a plurality of coil portions provided around the reference line, and has at least one set of adjacent coil portions when viewed from a direction along the reference line. In the coil portion, a power transmission coil in which one of the coil portions and the other coil portion mutually flow a current in the opposite direction around the coil axis and transmit power in a non-contact manner.
A non-contact power transmission unit characterized by comprising. The plurality of coil portions
The non-contact power transmission unit according to claim 1, wherein one lead wire is wound around a direction orthogonal to the reference line. The power transmission coil is
A claim in which an even number of the plurality of coil portions is provided, and in a combination of all the adjacent coil portions, one coil portion and the other coil portion mutually flow a current in the opposite direction around the coil axis. The non-contact power transmission unit according to 1 or 2. The plurality of coil portions
Each of the coil axes is located coaxially with the reference line, and when viewed from a direction along the reference line, one of the coil portions is located inside the adjacent coil portions and the other coil portion is located. The non-contact power transmission unit according to claim 1 or 2, wherein is located on the outside. A non-contact power transmission unit on the power transmission side that transmits power in a non-contact manner,
A non-contact power transmission unit on the power receiving side that receives power transmitted from the non-contact power transmission unit on the power transmission side is provided.
At least one of the non-contact power transmission unit on the power transmission side or the non-contact power transmission unit on the power reception side
A communication unit that is provided on a preset reference line and transmits or receives signals.
The coil portion formed in a spiral shape around each coil axis along the reference line, has a plurality of coil portions provided around the reference line, and has at least one set of adjacent coil portions when viewed from a direction along the reference line. In the coil portion, a power transmission coil in which one of the coil portions and the other coil portion mutually flow a current in the opposite direction around the coil axis and transmit power in a non-contact manner.
A non-contact power transmission system characterized by having.

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