JP5465575B2 - Non-contact power transmission antenna device, power transmission device, power reception device, and non-contact power transmission system - Google Patents

Description

  The present invention relates to a power transmission device used for non-contact power transmission and a non-contact power transmission antenna device disposed in the power reception device, a power transmission device and a power reception device including the non-contact power transmission antenna device, and the power transmission The present invention relates to a contactless power transmission system including a device and a power receiving device.

  As this type of non-contact power transmission system, a non-contact power transmission system (non-contact power supply system) disclosed in Patent Document 1 below is known. In this non-contact power transmission system, an alternating current is passed through the antenna device on the power transmission device side, and an induction magnetic field is formed and supplied to the antenna device on the power reception device side (moving body side). Each antenna device is generally configured to include an antenna coil (a power transmission coil for a power transmission device, a power reception coil for a power reception device), and an adjustment capacitor connected in parallel to the antenna coil. In this case, the antenna coil through which an alternating current flows is composed of litz wires in order to reduce an increase in impedance due to the skin effect.

JP 2008-273434 A (page 3-4, FIG. 1)

  However, the conventional non-contact power transmission antenna device has the following problems. That is, in the conventional non-contact power transmission antenna device, the antenna coil is made of litz wire (wiring formed by twisting a plurality of covered wires (for example, enamel wires)) in order to reduce an increase in resistance value due to the skin effect. Although it comprises, each proximity | contact electric wire which comprises a litz wire has the proximity effect which inhibits the electric current which flows through a surface layer in the adjacent covered electric wire. Therefore, since the surface layer region where the current flows due to the skin effect decreases, the resistance value of the antenna coil increases, the loss in the antenna coil increases, and it is difficult to improve the Q value. There are challenges. Here, the Q value means a value represented by ωL / R (ω = 2πf, f: frequency of current flowing through the antenna coil, L: inductance of the antenna coil, R: loss of the antenna coil. Including resistance).

  In addition, when the antenna coil is configured with a litz wire, a crimp terminal is generally attached to each end of the litz wire when connecting to the adjustment capacitor, and the adjustment capacitor electrode is used by using this crimp terminal. A configuration in which the screw is directly screwed to the connection or a configuration in which the connection is made via a terminal block or the like is adopted. In this case, in this connection structure, each end of the antenna coil is in point contact with each electrode of the capacitor, so that the loss is caused by an increase in contact resistance between the antenna coil and the adjustment capacitor. There is also a problem to be solved that the Q value further increases and the improvement of the Q value becomes more difficult.

  The present invention has been made to solve such a problem, and a main object of the present invention is to provide a non-contact power transmission antenna device capable of reducing the loss in the antenna coil and improving the Q value. Another main object is to provide a power transmission device and a power reception device including the antenna device, and a non-contact power transmission system including the power transmission device and the power reception device.

  In order to achieve the above object, an antenna device for non-contact power transmission according to claim 1 includes an antenna coil configured with a conductor line formed in a loop shape, and a capacitor connected in parallel to the antenna coil. A non-contact power transmission antenna device, wherein the antenna coil is formed of a strip-shaped conductive metal plate as the conductor line, and the capacitor has a columnar outer shape and electrodes are formed on each planar end surface. And both ends of the antenna coil face each other in parallel with each other when the antenna coil is bent or twisted, and the capacitor is disposed between the both ends of the antenna coil. One end surface is in surface contact with one end portion of the both end portions, and the other end surface of each end surface is the end portion of the both end portions. Chino is disposed in the other state where the end portion in surface contact with the.

  The contactless power transmission antenna device according to claim 2 is the contactless power transmission antenna device according to claim 1, wherein at least one of the both ends of the antenna coil is the antenna coil. Is disposed in the inner region surrounded by the conductor line of the antenna coil.

  To achieve the above object, a power transmission device according to claim 3 is a non-contact power transmission antenna device according to claim 1 or 2, and a signal generation that generates an AC signal and supplies the AC signal to the non-contact power transmission antenna device. Department.

  In order to achieve the above object, a power receiving device according to claim 4 rectifies the AC voltage generated in the antenna coil of the non-contact power transmission antenna device according to claim 1 and the non-contact power transmission antenna device. And a DC voltage generator for smoothing and generating a DC voltage.

  To achieve the above object, a non-contact power transmission system according to claim 5 includes the power transmission device according to claim 3 and the power reception device according to claim 4, wherein the antenna coil of the power transmission device and the power reception device The antenna coil is electromagnetically coupled.

  According to the antenna device for non-contact power transmission according to claim 1, the litz wire is used as the conductor line by using one strip-shaped conductive metal plate having a large surface area as the conductor line constituting the antenna coil. Since the proximity effect can be avoided as compared with the configuration, the resistance value of the conductive metal plate (that is, the resistance value of the antenna coil) can be sufficiently reduced even in the frequency region where the skin effect occurs. In addition, the Q value can be improved by reducing the resistance value.

  According to the antenna device for non-contact power transmission according to claim 2, at least one of both end portions of the antenna coil is bent inside the antenna coil formed in a loop shape, whereby the conductor line of the antenna coil is Since the capacitor is disposed in the inner region surrounded by the antenna, the outer shape of the device is reduced as compared with the configuration in which the capacitor is disposed in the outer region surrounded by the conductor line of the antenna coil (non-contact power transmission antenna). The device can be miniaturized).

  According to the power transmission device according to claim 3, by providing the non-contact power transmission antenna device according to claim 1, it is possible to reduce the loss generated in the non-contact power transmission antenna device, and thereby the power transmission. Efficiency can be improved. Further, since the non-contact power transmission antenna device according to the second aspect is provided, the non-contact power transmission antenna device can be miniaturized, and as a result, the power transmission device itself can be miniaturized.

  According to the power receiving device of the fourth aspect, by providing the non-contact power transmission antenna device according to the first aspect, it is possible to reduce the loss generated in the non-contact power transmission antenna device. Efficiency can be improved. In addition, since the non-contact power transmission antenna device according to the second aspect is provided, the non-contact power transmission antenna device can be miniaturized. As a result, the power receiving device itself can also be miniaturized.

  According to the non-contact power transmission system according to claim 5, each of the non-contact power transmission antennas of the power transmission device and the power reception device includes the power transmission device according to claim 3 and the power reception device according to claim 4. Loss generated in the apparatus can be reduced, thereby improving power transmission efficiency. Further, as a result of the miniaturization of the non-contact power transmission antenna device, the power transmission device and the power receiving device itself can also be miniaturized, whereby the entire system can be miniaturized.

1 is a configuration diagram showing a configuration of a power transmission system 1. FIG. 3 is an exploded perspective view showing configurations of a transmission antenna device 12 and a reception antenna device 41. FIG. The transmitting antenna device 12 and the receiving antenna device 41 in a state where the capacitor 22 (52) is disposed between both end portions 31a, 31b (61a, 61b) of the conductive metal plate 31 (61) constituting the antenna coil 21 (51). It is a perspective view which shows the structure. It is a disassembled perspective view which shows the structure of 12 A of transmission antenna apparatuses and 41 A of receiving antenna apparatuses. It is a perspective view which shows the structure of the transmission antenna apparatus 12B and the receiving antenna apparatus 41B. It is a perspective view which shows the structure of 12 C of transmission antenna apparatuses and 41 C of receiving antenna apparatuses. It is a perspective view which shows the structure of transmitting antenna apparatus 12D and receiving antenna apparatus 41D.

  Hereinafter, an embodiment of a non-contact power transmission system will be described with reference to the accompanying drawings.

  A non-contact power transmission system (hereinafter also simply referred to as “power transmission system”) 1 illustrated in FIG. 1 includes a power transmission device 2 and a power reception device 3 as an example, and the power reception device 3 receives power from the power transmission device 2 in a contactless manner. In addition, the received power can be output to the load (in this example, a battery as an example) 4.

  As shown in FIG. 1, the power transmission device 2 includes a signal generation unit 11 and a transmission non-contact power transmission antenna device (hereinafter also referred to as “transmission antenna device”) 12. The signal generator 11 generates and outputs an AC signal S1.

  As shown in FIG. 1 as an example, the transmission antenna device 12 includes an antenna coil 21 and a capacitor 22 and is supplied with an AC signal S1 from the signal generator 11 via a coaxial cable (not shown). Specifically, as shown in FIG. 2, for example, the antenna coil 21 has a rectangular shape in a plan view in a state where both end portions 31 a and 31 b are separated from each other as one conductor metal plate 31 as a conductor line. It is configured as a one-turn coil by bending it into (an example of a loop shape) (by bending it at a right angle). In the antenna coil 21, the conductive metal plate 31 is bent into a quadrangular shape so that both end portions 31a and 31b are located at one same corner, and one end portion 31a of the both end portions 31a and 31b is also formed. Is bent toward the inside of the antenna coil 21 so as to be parallel to one side (the lower side in the figure) of the antenna coil 21 including the other end 31b. Each end 31a, 31b has the same number of through holes 31c as the screw holes (in this example, as an example, according to the positions of the screw holes provided in the electrodes described later formed at the respective ends of the capacitor 22). 2) formed. Further, the distance L1 between the end portions 31a and 31b is defined to be equal to the total length of the capacitor 22.

  As an example, as shown in FIG. 2, the capacitor 22 is configured by a columnar (capacitor-type vacuum capacitor) in which the capacitance can be changed (in this example, a columnar shape). The capacitor 22 has both end portions 22a and 22b in the length direction as electrodes (as an example in which electrodes are formed at both end portions 22a and 22b, both end portions 22a and 22b themselves are formed as electrodes. Example) Two screw holes 22c are formed as an example on the end surfaces of the end portions 22a and 22b formed in a planar shape. In addition, although the whole area of both ends 22a and 22b is formed as an electrode, a part of both ends 22a and 22b can also be formed as an electrode.

  As shown in FIG. 3, the capacitor 22 has one end 22 a in surface contact with one end 31 a of the conductive metal plate 31 and the other end 22 b of the other end of the conductive metal plate 31. Each end of the conductive metal plate 31 is in surface contact with the end portion 31b of each of the conductive metal plates 31 in a state where the screw holes 22c of the end portions 22a and 22b communicate with the corresponding through holes 31c of the end portions 31a and 31b. It is mounted between the portions 31a and 31b, and in this mounted state, the screw 13 is screwed into each screw hole 22c through the through hole 31c, so that the end surface of one end 22a is one of the conductive metal plates 31. The end portion 31a of the capacitor 22 is in close contact with the other end portion 31a and the end surface of the other end portion 22b is in close contact with the other end portion 31b of the conductive metal plate 31, that is, the end portions 22a and 22b of the capacitor 22 are Each end 31a, 31 of the conductive metal plate 31 And a very low state of contact resistance, is mounted on the antenna coil 21.

  With this configuration, the capacitor 22 is connected in parallel to the antenna coil 21. The capacitor 22 is disposed between one end 31a of the conductive metal plate 31 bent toward the inner side of the antenna coil 21 and the other end 31b facing the end 31a. Thus, the antenna coil 21 is disposed in an inner region surrounded by the conductive metal plate 31 (an inner region of a virtual rectangle formed by the outer edge of the antenna coil 21 having a square shape in plan view).

  As shown in FIG. 1, the power reception device 3 includes a non-contact power transmission antenna device (hereinafter also referred to as “reception antenna device”) 41 and a DC voltage generation unit 42.

  As an example, the receiving antenna device 41 includes an antenna coil 51 and a capacitor 52 as shown in FIG. Specifically, as shown in FIG. 2, for example, the antenna coil 51 includes a single band-shaped conductive metal plate 61 as a conductor line between both ends 61a and 61b, as in the antenna coil 21. It is configured as a one-turn coil by bending it into a square shape (an example of a loop shape) in a plan view (an example of a loop shape). In the antenna coil 51, the conductive metal plate 61 is bent into a quadrangular shape so that both end portions 61a and 61b are positioned at one same corner, and one end portion 61a of the both end portions 61a and 61b is further formed. Is bent toward the inside of the antenna coil 51 so as to be parallel to one side (the lower side in the figure) of the antenna coil 51 including the other end 61b. Each end 61a, 61b has the same number of through holes 61c as the screw holes (in this example, as an example, according to the positions of the screw holes provided in the electrodes described later formed at the respective ends of the capacitor 52. 2) formed. Further, the distance L2 between the end portions 61a and 61b is defined to be equal to the total length of the capacitor 52.

  As an example, as shown in FIG. 2, the capacitor 52 is configured by a columnar (capacitor-shaped vacuum capacitor) in which the capacitance can be changed (in this example, a columnar shape). The capacitor 52 has both end portions 52a and 52b in the length direction as electrodes (as an example in which electrodes are formed at both end portions 52a and 52b, both end portions 52a and 52b themselves are formed as electrodes. For example, two screw holes 52c are formed as an example on the end surfaces of the end portions 52a and 52b formed in a planar shape. In addition, although the whole area of both ends 52a and 52b is formed as an electrode, a part of both ends 52a and 52b can also be formed as an electrode.

  As shown in FIG. 3, the capacitor 52 has one end portion 52 a in surface contact with one end portion 61 a of the conductive metal plate 61 and the other end portion 52 b having the other end of the conductive metal plate 61. Each end of the conductive metal plate 61 is in surface contact with the end portion 61b of the metal plate 61, and the screw holes 52c of the end portions 52a and 52b and the corresponding through holes 61c of the end portions 61a and 61b communicate with each other. It is mounted between the portions 61a and 61b, and in this mounted state, the screw 13 is screwed into each screw hole 52c through the through hole 61c, so that the end surface of one end 52a is one of the conductive metal plates 61. The end portion 61a of the capacitor 52 is in close contact with the other end portion 61a and the end surface of the other end portion 52b is in close contact with the other end portion 61b of the conductive metal plate 61. Each end 61a, 61 of the conductive metal plate 61 And a very low state of contact resistance, is mounted on the antenna coil 51.

  With this configuration, the capacitor 52 is connected to the antenna coil 51 in parallel. The capacitor 52 is disposed between one end 61a of the conductive metal plate 61 bent toward the inside of the antenna coil 51 and the other end 61b facing the end 61a. Thus, the antenna coil 51 is disposed in an inner region surrounded by the conductive metal plate 61 (an inner region of a virtual rectangle formed by the outer edge of the antenna coil 51 having a square shape in plan view).

  In addition, since the basic configuration of the receiving antenna device 41 is the same as that of the transmitting antenna device 12, the configuration has been described with reference to FIGS. Thus, the antenna coil 51 and the capacitor 52 of the reception antenna device 41 are not limited to the same configuration as the antenna coil 21 and the capacitor 22 of the transmission antenna device 12. That is, even when the conductive metal plate 61 having the same dimensions (the same width, thickness, and length) as the conductive metal plate 31 is used, the length of each side of the antenna coil 51 is set to each of the antenna coils 21. The antenna coil 51 may be made of a conductive metal plate 61 having a dimension different from that of the conductive metal plate 31 (different in at least one of width, thickness and length). (The length and width of each side) can be made different from those of the antenna coil 21. In addition, the capacitor 52 may have the same shape as the capacitor 22 or may have a different shape. Further, the capacitance value of the capacitor 52 may be defined to be the same as or different from the capacitance value of the capacitor 22.

  The DC voltage generation unit 42 includes, as an example, a rectifier circuit and a smoothing circuit (both not shown), and rectifies and smoothes an AC voltage generated in the antenna coil 51 constituting the receiving antenna device 41 to generate a DC voltage. V1 is generated. The DC voltage generator 42 supplies the generated DC voltage V <b> 1 to the load 4.

  Next, the operation of the power transmission system 1 will be described.

  In the power transmission system 1, first, in a state where the signal generation unit 11 outputs the AC signal S <b> 1 with low power, the capacitance value of the capacitor 22 on the transmission antenna device 12 side is adjusted, and the power transmission device 2 side The matching state of the transmitting antenna device 12 is shifted to a good state, and the capacitance value of the capacitor 52 on the receiving antenna device 41 side is adjusted to shift the matching state of the receiving antenna device 41 on the power receiving device 3 side to a good state. Let

  Next, the power of the AC signal S1 output from the signal generator 11 is increased to a specified power. Thereby, power transmission is performed with high efficiency from the power transmitting device 2 to the power receiving device 3 via the antenna coil 21 and the antenna coil 51 electromagnetically coupled to the antenna coil 21. As a result, the load ( The DC voltage V1 is output with high efficiency to the battery (4) (the battery is charged).

  According to the transmission antenna device 12, the power transmission device 2 including the transmission antenna device 12, and the power transmission system 1 including the power transmission device 2, the conductor line constituting the antenna coil 21 has a large surface area as described above. By using one strip-shaped conductive metal plate 31, it is possible to avoid the proximity effect as compared with the configuration using a litz wire as a conductor line, so in the frequency region where the skin effect occurs. In addition, the resistance value of the conductive metal plate 31 with respect to the AC signal S1 (that is, the resistance value of the antenna coil 21) can be sufficiently reduced, and the Q value can be improved by reducing the resistance value.

  Further, both end portions of the antenna coil 21 (that is, both end portions 31a and 31b of the conductive metal plate 31 constituting the antenna coil 21) face each other in a parallel state, and the capacitor 22 is arranged between the both end portions 31a and 31b. In addition, the contact resistance between the antenna coil 21 and the capacitor 22 can be sufficiently reduced by providing the end portions 22a and 22b of the capacitor 22 in surface contact with the end portions 31a and 31b. As a result, the Q value can be further improved.

  Therefore, according to the transmission antenna device 12, the power transmission device 2 including the transmission antenna device 12, and the power transmission system 1 including the power transmission device 2, loss generated in the transmission antenna device 12 can be reduced. Thereby, the power transmission efficiency can be improved. Further, since the antenna coil 21 can be manufactured by punching and bending a metal plate as compared with manufacturing using a litz wire, the manufacturing can be automated. Thus, the cost of the antenna coil 21 can be reduced.

  In the power transmission system 1, similarly to the transmission antenna device 12, the reception antenna device 41 also has a single band-shaped conductive metal plate having a large surface area as a conductor line constituting the antenna coil 51 as described above. 61 is used. Accordingly, the reception antenna device 41 can avoid the proximity effect in the same manner as the transmission antenna device 12, so that the resistance value of the conductive metal plate 61 (that is, the frequency range in which the skin effect occurs) The resistance value of the antenna coil 51 can be sufficiently reduced, and the Q value can be improved by reducing the resistance value.

  Further, both end portions of the antenna coil 51 (that is, both end portions 61a and 61b of the conductive metal plate 61 constituting the antenna coil 51) face each other in a parallel state, and a capacitor 52 is disposed between the both end portions 61a and 61b. In addition, the contact resistance between the antenna coil 51 and the capacitor 52 can be sufficiently reduced by providing the end portions 52a and 52b of the capacitor 52 in surface contact with the end portions 61a and 61b. As a result, the Q value can be further improved.

  Therefore, according to the receiving antenna device 41, the power receiving device 3 including the receiving antenna device 41, and the power transmission system 1 including the power receiving device 3, loss generated in the receiving antenna device 41 can be reduced. As a result, the power transmission efficiency can be further improved. Also, the antenna coil 51 can be manufactured by punching and bending a metal plate in the same manner as the antenna coil 21 as compared with manufacturing using a litz wire, so that the manufacturing is automated. As a result, the cost of the antenna coil 51 can be reduced.

  In the transmitting antenna device 12, one end 31a of the conductive metal plate 31 is bent inside the antenna coil 21 formed in a loop shape as described above, and the capacitor 22 is connected to the one end 31a. And the other end 31b of the conductive metal plate 31 (the end opposite to the one end 31a), thereby being surrounded by the conductive metal plate 31 as a conductor line of the antenna coil 21. Arranged in the inner region. Therefore, according to the transmission antenna device 12, the outer shape of the device can be reduced (the transmission antenna device 12 can be reduced in size). As a result, the power transmission device 2 including the transmission antenna device 12, and further the power transmission device 2 can be provided. The entire power transmission system 1 provided can be reduced in size.

  Similarly, also in the receiving antenna device 41, one end 61a of the conductive metal plate 61 is bent inside the antenna coil 51 as described above, and the capacitor 52 is electrically conductive with the one end 61a. An inner region surrounded by the conductive metal plate 61 as a conductor line of the antenna coil 51 by being disposed between the other end portion 61b of the metal plate 61 (the end portion facing the one end portion 61a). It is arranged. Therefore, according to the receiving antenna device 41, the outer shape of the device can be reduced (the receiving antenna device 41 can be downsized). As a result, the power receiving device 3 including the receiving antenna device 41, and further the power receiving device 3 can be provided. The entire power transmission system 1 provided can be reduced in size.

  In the transmission antenna device 12 described above, the conductive metal plate 31 is bent into a quadrangular shape so that both end portions 31 a and 31 b are located at one same corner, and one end portion 31 a is placed inside the antenna coil 21. The capacitor 22 is arranged between the one end 31a and the other end 31b, and the receiving antenna device 41 has the same end portions 61a and 61b. The conductive metal plate 61 is folded into a square shape in a state of being located at the corner, and one end 61a is bent toward the inside of the antenna coil 51, so that the one end 61a and the other end 61b Although the configuration in which the capacitor 52 is arranged between them is adopted, a configuration like the transmission antenna device 12A and the reception antenna device 41A shown in FIG. 4 can also be adopted.Hereinafter, the transmitting antenna device 12A and the receiving antenna device 41A configured as shown in FIG. 4 will be described. In addition, about the structure same as the above-mentioned transmission antenna apparatus 12 and the receiving antenna apparatus 41, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the transmitting antenna device 12A shown in FIG. 4, the conductive metal plate 31 is bent into a quadrangular shape so that both end portions 31a and 31b of the conductive metal plate 31 are located at the central portion of one side, and each end portion 31a, The antenna coil 21 is formed by bending the wire 31b toward the inside at a right angle, and the capacitor 22 is disposed between the both end portions 31a and 31b. In the receiving antenna device 41A shown in the figure, the conductive metal plate 61 is bent into a quadrangular shape so that both end portions 61a and 61b of the conductive metal plate 61 are located at the center of one side, and each end portion The antenna coil 51 is formed by bending 61a and 61b at right angles toward the inside, and the capacitor 52 is disposed between the both end portions 61a and 61b.

  Transmitting antenna device 12A and receiving antenna device 41A adopting this configuration, power transmitting device 2 including transmitting antenna device 12A, power receiving device 3 including receiving antenna device 41A, and power transmission including power transmitting device 2 and power receiving device 3 Also in the system 1, only the arrangement position of the capacitor 22 with respect to the antenna coil 21 and the arrangement position of the capacitor 52 with respect to the antenna coil 51 are different, and the transmission antenna apparatus 12A and the transmission antenna apparatus 12 have the same other configurations, and reception. Since the antenna device 41A and the receiving antenna device 41 have the same configuration, the transmitting antenna device 12, the receiving antenna device 41, the power transmitting device 2 including the transmitting antenna device 12, and the power receiving device including the receiving antenna device 41 are used. Device 3, and power transmission device 2 and power receiving device 3. It is possible to achieve the same effect as the transmission system 1.

  In the transmission antenna device 12 and the reception antenna device 41, and the transmission antenna device 12A and the reception antenna device 41A described above, the antenna coil 21 and the antenna coil 51 are formed in a square shape in plan view. It can also be formed in an elliptical shape or a circular shape (a bending process for bending into a circular shape) like the transmitting antenna device 12B and the receiving antenna device 41B shown in FIG. Note that the transmitting antenna device 12B and the receiving antenna device 41B are different from each other only in the shapes of the antenna coil 21 and the antenna coil 51 as described above. Since it is the same as the transmitting antenna device 12A and the receiving antenna device 41A, the same components are denoted by the same reference numerals and redundant description is omitted.

  Even in the case where the planar view shape of the antenna coils 21 and 51 is a shape other than the square shape in the plan view as in the transmission antenna device 12B and the reception antenna device 41B, other configurations other than the shapes of the coils 21 and 51 are provided. Is the same as the transmission antenna device 12 and the reception antenna device 41 described above, the transmission antenna device 12 and the reception antenna device 41 described above, the power transmission device 2 including the transmission antenna device 12, and the power reception device including the reception antenna device 41. 3 and the same effect as the power transmission system 1 including the power transmission device 2 and the power reception device 3 can be obtained.

  Further, in each of the transmission antenna devices 12, 12 </ b> A, 12 </ b> B and the reception antenna devices 41, 41 </ b> A, 41 </ b> B described above, at least one of both end portions 31 a, 31 b of the conductive metal plate 31 is bent inside the antenna coil 21. The capacitors 22 and 52 are arranged inside the antenna coils 21 and 51 by bending at least one of the both end portions 61a and 61b of the conductive metal plate 61 inside the antenna coil 51, and the device is Although a preferable configuration for reducing the size is adopted, when there is a sufficient installation space, a configuration in which at least one of both end portions 31a and 31b of the conductive metal plate 31 is bent to the outside of the antenna coil 21, or conductive Bending at least one of both end portions 61 a and 61 b of the conductive metal plate 61 outside the antenna coil 51. It is also possible to adopt a configuration.

  For example, in the transmitting antenna device 12B and the receiving antenna device 41B shown in FIG. 5, both end portions 31a and 31b of the conductive metal plate 31 are bent to the outside of the antenna coil 21, and both end portions 61a and 61b of the conductive metal plate 61 are By bending the antenna coil 51 to the outside, it can be configured as a transmitting antenna device 12C and a receiving antenna device 41C shown in FIG. In the transmitting antenna device 12C and the receiving antenna device 41C, the capacitor 22 is disposed between both end portions 31a and 31b bent to the outside of the antenna coil 21, and both end portions 61a and 61b bent to the outside of the antenna coil 51. Since the capacitor 52 is disposed between the antenna coil 21 and the antenna coil 51 having a circular shape in plan view, the outer region of the antenna coil 21 and the antenna coil 51 (the outer side of the virtual circle formed by the outer edges of the antenna coil 21 and the antenna coil 51 having a circular shape in plan view). The capacitor 22 and the capacitor 52 are arranged in the region.

  Like the transmitting antenna device 12C and the receiving antenna device 41C, at least one of both end portions 31a and 31b of the conductive metal plate 31 is bent to the outside of the antenna coil 21, or both end portions 61a of the conductive metal plate 61. , 61b, when adopting a configuration in which the outside of the antenna coil 51 is bent, except that the capacitors 22 and 52 are disposed in the outer region of the antenna coils 21 and 51 as described above. These are the same as the transmission antenna device 12 and the reception antenna device 41 described above. For this reason, at least one of the both end portions 31a and 31b of the conductive metal plate 31 is bent to the outside of the antenna coil 21, and at least one of the both end portions 61a and 61b of the conductive metal plate 61 is the antenna coil 51. According to the transmission antenna device such as the transmission antenna device 12C and the reception antenna device 41C such as the reception antenna device 41C that adopt the configuration of bending outside the transmission antenna, the transmission antenna of the above-described effects produced by the transmission antenna device 12 and the reception antenna device 41 Other effects can be obtained in the same manner except for the effect that the device 12 and the receiving antenna device 41 can be miniaturized.

  In each of the transmission antenna devices 12, 12A, 12B, and 12C and the reception antenna devices 41, 41A, 41B, and 41C, the conductive metal plate 31 and the conductive metal plate 61 are bent at a right angle or circularly. As shown in FIG. 7, the antenna coils 21 and 51 are formed by using the conductive metal plates 31 and 61 formed into a one-turn planar coil by punching out a metal flat plate as shown in FIG. In the case of the transmitting antenna device 12D and the receiving antenna device 41D constituting the coil 21 and the antenna coil 51, as shown in the figure, the portions near the end portions 31a and 31b in the conductive metal plate 31, and the conductive metal Twisting and deforming the vicinity of each end 61a, 61b of the plate 61 from the state indicated by the alternate long and short dash line to the state indicated by the solid line Ri, each end 31a, or are opposed to 31b, also it is possible to use a construction in which each end 61a, and 61b or to the counter.

  Also in the transmission antenna device 12D and the reception antenna device 41D, a single strip having a large surface area is provided in the same manner as the transmission antenna devices 12, 12A, 12B, and 12C and the reception antenna devices 41, 41A, 41B, and 41C. Are used, and both end portions 31a and 31b of the conductive metal plate 31 constituting the antenna coil 21 and the respective end portions 22a and 22b of the capacitor 22 (not shown in FIG. 7). 3), and both ends 61a and 61b of the conductive metal plate 61 constituting the antenna coil 51 and the respective ends 52a and 52b of the capacitor 52 (not shown in FIG. 7). 3), the transmission antenna devices 12, 12A, 12B, 12C, and Similarly to the receiving antenna devices 41, 41A, 41B, 41C, the resistance value of the conductive metal plates 31, 61 (that is, the resistance value of the antenna coils 21, 51) can be sufficiently reduced, and the resistance value can be reduced. The Q value can also be improved. Therefore, also in the transmission antenna device 12D and the reception antenna device 41D, the power transmission efficiency can be improved.

DESCRIPTION OF SYMBOLS 1 Power transmission system 2 Power transmission apparatus 3 Power receiving apparatus 12, 12A, 12B, 12C, 12D Transmission antenna apparatus 21, 51 Antenna coil 22 Capacitor 31, 61 Conductive metal plate 41, 41A, 41B, 41C, 41D Transmission antenna apparatus 51 Antenna Coil 52 Capacitor S1 AC signal

Claims (5)

An antenna coil formed by forming a conductor line in a loop;
A non-contact power transmission antenna device comprising a capacitor connected in parallel to the antenna coil,
The antenna coil is composed of a strip-shaped conductive metal plate as the conductor line,
The capacitor has a columnar outer shape and electrodes are formed on each planar end surface,
Both ends of the antenna coil face each other in a parallel state by bending or twisting the antenna coil,
In the capacitor, between the both end portions of the antenna coil, one end surface of each end surface is in surface contact with one end portion of the both end portions, and the other of the end surfaces is An antenna device for non-contact power transmission which is disposed in a state where the end surface is in surface contact with the other end portion of the both end portions.   2. The capacitor according to claim 1, wherein the capacitor is disposed in an inner region surrounded by the conductor line of the antenna coil by bending at least one of the both end portions of the antenna coil to the inside of the antenna coil. Non-contact power transmission antenna device.   3. A power transmission device comprising: the contactless power transmission antenna device according to claim 1; and a signal generation unit that generates an AC signal and supplies the AC signal to the contactless power transmission antenna device.   The antenna device for non-contact power transmission according to claim 1 or 2, and a DC voltage generator for rectifying and smoothing an AC voltage generated in the antenna coil of the antenna device for non-contact power transmission and generating a DC voltage. A power receiving device.   A non-contact power transmission system comprising the power transmission device according to claim 3 and the power reception device according to claim 4, wherein the antenna coil of the power transmission device and the antenna coil of the power reception device are electromagnetically coupled.

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