JP2013115069A - Antenna for electric power transmission, electric power transmission device, and contactless type electric power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna for electric power transmission capable of securely transmitting electric power to an electric power reception device side wherever an antenna on the side of the electric power reception device is when used for an electric power transmission device.SOLUTION: Side parts A1, A5 forming parts of a transmission antenna 12 constituted by winding a conductor 6 by one turn or two or more turns are positioned in a plane PL2 crossing a plane PL1 containing other side parts A2, A3, and A4 constituting the remaining parts of the transmission antenna 12 to constitute a structure which is plane-asymmetrical on the whole.

Description

  The present invention relates to a power transmission antenna used for contactless power transmission, a power transmission device including the power transmission antenna, and a contactless power transmission device including the power transmission device and a power reception device.

  As this type of non-contact power transmission device, a non-contact power transmission device disclosed in Patent Document 1 below is known. In this non-contact power transmission device, a planar coil is used as a transmission antenna (power transmission antenna) used for a power transmission device and a reception antenna used for a power reception device. This planar coil is configured as a loop antenna by winding a conducting wire a plurality of turns.

Japanese Unexamined Patent Publication No. 2011-66336 (page 4, FIG. 2-3)

  However, the following non-contact power transmission devices have the following problems to be solved. That is, in this non-contact type power transmission device, since planar coils are used as transmission and reception antennas used in the power transmission device and the power reception device, the antennas face each other in a parallel state. Power is transmitted with good power transmission efficiency, but when one antenna is placed at a specific position with respect to one antenna, When the receiving antenna on the power receiving device side is located in a plane that divides the transmitting antenna on the device side into two so as to be plane-symmetric, the coupling coefficient between the coils for both powers is as close to zero as possible. The power transmission efficiency is greatly reduced. That is, this non-contact power transmission apparatus has a problem to be solved that the power transmission efficiency may be significantly reduced depending on the position of the reception antenna with respect to the transmission antenna. This problem may occur not only in the power transmission by the electromagnetic induction method but also in the power transmission by the magnetic field resonance method having a high tolerance for the positional deviation between the two coils.

  The present invention has been made to solve such a problem. When used in a power transmission device, the present invention is for power transmission that can reliably transmit power to the power receiving device side regardless of the position of the antenna on the power receiving device side. The main purpose is to provide an antenna. Another main object is to provide a power transmission device including the power transmission antenna and a non-contact power transmission device including the power transmission device.

  In order to achieve the above object, the power transmission antenna according to claim 1, wherein the power transmission antenna comprises one or more turns constituting a ring coil formed by winding the lead wire for one turn or two or more turns. The side portion is located in the second surface of any one of the plane and the curved surface that intersects the first surface of any one of the plane and the curved surface including the other side portions constituting the remaining portion of the conducting wire for one turn. At the same time, it has a non-plane symmetry structure as a whole.

  The power transmission antenna according to claim 2 is the power transmission antenna according to claim 1, wherein the annular coil is formed by winding the conductive wire in two or more turns, and constitutes a part of the annular coil. The one or more sides to be positioned are located in the second surface intersecting the first surface including the other sides constituting the remaining portion of the annular coil.

  According to a third aspect of the present invention, there is provided a power transmission device according to the first or second aspect, a signal generation unit that generates an alternating current signal and outputs the alternating current signal to the power transmission antenna, the power transmission antenna, A power transmission antenna and a matching unit for matching the signal generation unit are provided between the power generation antenna and the signal generation unit.

  According to a fourth aspect of the present invention, there is provided a non-contact power transmission device according to the third aspect, a power receiving antenna that electromagnetically couples with the power transmission antenna of the power transmission device to generate an AC voltage, and the power receiving device. And a power receiving device having a DC voltage generating unit that rectifies and smoothes the AC voltage generated in the antenna for generating a DC voltage.

  The power transmission antenna according to claim 1, wherein the conductor for one turn includes side portions included in the first surface and the second surface intersecting each other, and the power transmission antenna as a whole has a non-plane symmetry structure. Therefore, the power receiving apparatus is always coupled to the receiving antenna of the power receiving apparatus with a certain degree of coupling (medium degree or higher coupling degree) without being greatly affected by the direction and position of the power receiving apparatus. Therefore, according to this power transmission antenna, it is possible to reliably avoid the occurrence of a situation in which the degree of coupling between the power receiving device and the receiving antenna becomes extremely small due to the orientation and position of the power receiving device.

  In the power transmission antenna according to claim 2, one or more sides constituting a part of the annular coil formed by winding and winding the conducting wire for two or more turns constitute the remaining part of the annular coil. Since it is located in the 2nd surface which cross | intersects the 1st surface including the edge part of this, it is greatly influenced by the direction and position of a power receiving apparatus similarly to the antenna for electric power transmission of Claim 1. Therefore, it is always coupled with the receiving antenna of the power receiving apparatus with a certain degree of coupling (medium degree or more coupling degree), so the coupling degree with the receiving antenna of the power receiving apparatus due to the orientation and position of the power receiving apparatus. It is possible to reliably avoid the occurrence of such a situation that becomes extremely small.

  According to the power transmission device according to claim 3 and the non-contact power transmission device according to claim 4 provided with the power transmission device, in a room in which the power transmission antenna is formed around (that is, the power transmission antenna) Even if the orientation and position of a power receiving device such as a portable terminal with a built-in receiving antenna are changed in a nearby space, the occurrence of a situation in which the power received by the power receiving device is extremely reduced is reliably avoided. Meanwhile, the transmitted power can be transmitted to the power receiving device.

1 is a block diagram of a contactless power transmission device 1. FIG. 4 is an explanatory diagram for explaining a configuration of a transmission antenna 12. FIG. 3 is a circuit diagram of a first matching unit 13 of the power transmission device 2. FIG. 4 is a circuit diagram of a second matching unit 22 of the power receiving device 3. FIG. It is explanatory drawing for demonstrating the structure of other transmission antenna 12A. It is explanatory drawing for demonstrating the structure of the other transmission antenna 12B. It is explanatory drawing for demonstrating the structure of other transmission antenna 12C.

  Hereinafter, embodiments of a power transmission antenna, a power transmission device, and a non-contact power transmission device will be described with reference to the accompanying drawings.

  1 includes a power transmission device 2 and a power reception device 3, and the power transmission device 2 transmits power to the power reception device 3 (the power transmission device 2 is connected to the power transmission device 2). The power receiving device 3 receives the transmitted power transmitted from the power transmitting device 2 in a contactless manner and supplies the received transmitted power to the load (battery in this example) 4. It is configured to be possible.

  In this example, as an example, the power transmission device 2 is configured to transmit power to a portable terminal as the power reception device 3 existing in the room 5 as illustrated in FIG. 3 is supplied to a load (battery) 4 built in itself.

  As illustrated in FIGS. 1 and 2, the power transmission device 2 includes a signal generation unit 11, a transmission antenna 12, and a first matching unit 13. The signal generator 11 generates and outputs an AC signal S1. The signal generator 11 is configured to be able to change the output power value of the AC signal S1. Specifically, the signal generator 11 is in any one of a state in which the AC signal S1 is output at a specified power value W1a and a state in which the AC signal S1 is output at a power value W1b that is less than the specified power value W1a. It is possible to operate with.

  The transmission antenna 12 is an antenna for power transmission, and as an example, as shown by a thick line in FIG. 2, the conductor 6 is wound one turn or along the wall surface of the room 5 for two or more turns (in this example, As an example, it is configured as an annular coil by winding two or more turns in a superimposed manner (the same applies to the following transmission antennas 12A and 12B). Specifically, for a rectangular parallelepiped room 5 composed of a lower wall surface (floor) 5a, an upper wall surface (ceiling) 5b, and four wall surfaces (side walls) 5c, 5d, 5e, 5f, Side A1 composed of the conductive wire 6 disposed along the joint between the two wall surfaces 5c and 5f, and side A2 composed of the conductive wire 6 disposed along the joint between the wall 5c and the lower wall 5a A side portion A3 composed of a conductive wire 6 disposed along a path (diagonal line of the wall surface 5d) from the end portion on the wall surface 5d side of the side portion A2 to the upper end of the joint portion between the two wall surfaces 5d and the wall surface 5e, 5e and a side A4 composed of a conductive wire 6 disposed along a joint between the upper wall surface 5b and a side A5 composed of a conductive wire 6 disposed along a joint between the wall surface 5f and the upper wall 5b. It is configured.

  In addition, the transmission antenna 12 configured by winding the conducting wire 6 so as to surround the room 5 in this way has side portions A1 and A5 that constitute a part of the transmission antenna 12 (a part of the annular coil). 12 intersects with a plane PL1 (a plane as a first surface with diagonal lines) including other sides A2, A3, and A4 constituting the remaining 12 portions, and a straight line L1 (a straight line indicated by a one-dot chain line in FIG. 2). The other side portions A2, A3 and A4 are bent along a straight line L1 so as to be positioned in the plane (another plane as the second surface) PL2. The transmitting antenna 12 is plane symmetric with respect to the part formed by the sides A2, A3, and A4, but the lengths of the sides A1 and A5 are different from each other, and thus the transmission antenna 12 is configured by the sides A1 and A5. The portion to be processed is non-plane symmetric. For this reason, the transmission antenna 12 has a non-plane symmetry structure as a whole.

  In addition, the transmission antenna 12 is electromagnetically coupled to a reception antenna 21 (described later) disposed in the power receiving device 3. Specifically, the transmitting antenna 12 forms a pair of resonators (a pair of self-resonant coils) together with the receiving antenna 21, and resonates in an electromagnetic field.

  As shown in FIGS. 1 and 2, the first matching unit 13 is a matching unit on the power transmission side, and is disposed between the signal generation unit 11 and the transmission antenna 12 (specifically, the signal generation unit 11 and the transmission antenna 12), the impedance on the signal generator 11 side is matched with the impedance (input impedance) of the transmission antenna 12 that changes according to the distance between the reception antenna 21 and the transmission antenna 12. (The signal generator 11 and the transmission antenna 12 are shifted to a matching state).

  In this example, as an example, as shown in FIG. 3, the first matching unit 13 includes a variable capacitor 13a connected in parallel with the transmission antenna 12 and a series with respect to the transmission antenna 12. And a variable capacitor 13b connected in series to a parallel circuit including the antenna 12 and the variable capacitor 13a. With this configuration, the first matching unit 13 adjusts the capacitances of the variable capacitors 13a and 13b, so that the transmission antenna 12 (specifically, the input impedance of the transmission antenna 12 viewed from the signal generation unit 11 side) is adjusted. And the signal generator 11 (specifically, the output impedance on the signal generator 11 side viewed from the transmission antenna 12 side) are matched.

  As shown in FIG. 1, the power receiving device 3 includes a receiving antenna 21, a second matching unit 22, and a rectifying unit 23. The receiving antenna 21 is a power receiving antenna and, as an example, is configured by an annular planar coil as shown in FIG. In FIG. 2, the receiving antenna 21 is shown by a solid line so that the shape is clear, but the receiving antenna 21 is actually disposed inside the power receiving device 3. The reception antenna 21 is electromagnetically coupled to the transmission antenna 12 of the power transmission device 2 (that is, due to an electromagnetic field generated by the transmission antenna 12), and generates an induced voltage V1 between both ends thereof.

  The second matching unit 22 is a matching unit on the power receiving side, and is disposed between the receiving antenna 21 and the rectifying unit 23 (specifically, a transmission path that connects the receiving antenna 21 and the rectifying unit 23). The impedance (output impedance) of the receiving antenna 21 is matched with the impedance on the rectifying unit 23 side (the receiving antenna 21 and the rectifying unit 23 are shifted to the matching state).

  In this example, as an example, as shown in FIG. 4, the second matching unit 22 includes a variable capacitor 22 a connected in parallel to the reception antenna 21 and a series connection to the reception antenna 21 (that is, the reception antenna 21 and And a variable capacitor 22b connected in series to a parallel circuit composed of the variable capacitor 22a, and is configured in the same circuit as the first matching unit 13. With this configuration, the second matching unit 22 adjusts the capacitances of the variable capacitors 22a and 22b, so that the receiving antenna 21 (specifically, the output impedance of the receiving antenna 21 viewed from the rectifying unit 23 side) and The rectifying unit 23 (specifically, the input impedance of the rectifying unit 23 viewed from the receiving antenna 21 side) is matched. In this example, it is assumed that the capacitance of each of the variable capacitors 22a and 22b is set in advance in the second matching unit 22 so that the receiving antenna 21 and the rectifying unit 23 are matched.

  The rectifying unit 23 is an example of a DC voltage generating unit. As shown in FIG. 1, the rectifying unit 23 inputs an induced voltage V1 generated in the receiving antenna 21 through the second matching unit 22, and based on the induced voltage V1. The DC voltage Vo supplied to the battery 4 is generated. Specifically, the rectifying unit 23 includes a rectifying circuit and a smoothing circuit, and rectifies and smoothes the induced voltage (AC voltage) V1 output from the second matching unit 22 to generate the DC voltage Vo. The generated DC voltage Vo is supplied (output) to the battery 4. Moreover, it can replace with the rectification | straightening part 23 and can comprise a voltage generation part with an AC-DC converter, for example.

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

  First, in the power transmission device 1, matching adjustment with respect to the power transmission device 2 is performed prior to power transmission at the specified power value W1a.

  In this matching adjustment, first, the signal generation unit 11 of the power transmission device 2 is caused to output the AC signal S1 with power of the power value W1b (for example, 1 W) (the AC signal S1 is output with low power). Thereby, the transmission power is output from the power transmission device 2 to the power reception device 3 via the first matching unit 13 and the transmission antenna 12. In the power receiving device 3, the induced voltage V <b> 1 is generated in the receiving antenna 21 that is electromagnetically coupled to the transmitting antenna 12. Therefore, the rectifying unit 23 rectifies this induced voltage V <b> 1 output through the second matching unit 22, Generation of the DC voltage Vo is started. This DC voltage Vo is supplied to the battery 4.

  In this state, since the first matching unit 13 is not adjusted, in the power transmission device 2, the signal generator 11 and the transmission antenna 12 are not matched (in a mismatched state). For this reason, due to being in an inconsistent state, the power transmission device 2 is in a state where power loss occurs. However, since the power of the AC signal S1 output from the signal generator 11 is low power (power value W1b), the loss generated in the power transmission device 2 in the mismatched state is suppressed to an extremely small state.

  Next, by performing an operation on the first matching unit 13, power transmission side matching adjustment for matching the signal generation unit 11 and the transmission antenna 12 is performed. In this power transmission side matching adjustment, for example, a reflected power measuring instrument (not shown) is interposed between the signal generating unit 11 and the first matching unit 13, and the first matching unit measured by the reflected power measuring instrument. The capacitances of the variable capacitors 13a and 13b of the first matching unit 13 are adjusted so that the reflected power value from 13 is equal to or less than a predetermined threshold value (so as to be in a matching state).

  By performing this power transmission side matching adjustment, in the power transmission device 2, the signal generation unit 11 and the transmission antenna 12 are in a matching state. Therefore, the power transmission device 2 shifts to a state in which power loss generated during the power transmission operation is extremely small. . As a result, the transmission power having the power value W1b is transmitted from the power transmission device 2 to the power reception device 3 with little loss, and the power reception device 3 generates the DC voltage Vo having the power value W1b based on the transmission power. The battery 4 is supplied.

  Finally, the AC signal S1 is output at a specified power value W1a (for example, 100 W) to the signal generator 11 of the power transmission device 2. In this case, in the power transmission device 2, since the signal generation unit 11 and the transmission antenna 12 are already in a matched state, the power of the AC signal S1 output from the signal generation unit 11 is almost as it is (in a state with very little loss). Power is transmitted from the transmission antenna 12 as transmitted power.

  In this power transmission device 2, the transmission antenna 12 disposed around the room 5 is not a general planar annular coil (annular coil in which all parts are located in one plane), but the transmission antenna 12. The side portions A1 and A5 constituting a part of the non-planar shape are positioned in the plane PL2 intersecting the plane PL1 including the other side portions A2, A3 and A4 constituting the remaining part of the transmitting antenna 12. Since it is an annular coil and the lengths of the side portions A1 and A5 are different from each other, it is configured as a non-plane symmetrical structure as a whole.

  For this reason, in a transmission antenna constituted by a general planar annular coil, when the power receiving device 3 is rotated or moved in the room 5, it is coupled with the receiving antenna 21 in a specific direction or position. Although the degree becomes extremely large, the degree of coupling with the receiving antenna 21 becomes extremely small in another specific direction or a specific position (that is, the transmission antenna has strong directivity). On the other hand, the transmitting antenna 12 configured as described above includes side portions included in different planes PL1 and PL2 and is configured to have a non-symmetrical structure as a whole. Without being greatly affected by the position, it is always coupled to the receiving antenna 21 of the power receiving apparatus 3 with a certain degree of coupling (medium degree or more). That is, the transmission antenna 12 has characteristics close to so-called omnidirectionality.

  Thereby, according to this transmission antenna 12, due to the orientation and position of the power receiving device 3, it is possible to reliably avoid the occurrence of a situation in which the degree of coupling of the power receiving device 3 with the receiving antenna 21 becomes extremely small. it can.

  In addition, according to the power transmission device 2 including the transmission antenna 12 and the power transmission device 1 including the power transmission device 2, the power transmission device 1 includes the transmission antenna 12 in the room 5 formed around the transmission antenna 12 (that is, in the vicinity of the transmission antenna 12). Even if the direction and position of the power receiving device 3 such as a portable terminal incorporating the receiving antenna 21 are changed in the space), the occurrence of a situation in which the power received by the power receiving device 3 is extremely reduced is reliably avoided. However, the transmitted power can be transmitted to the power receiving device 3.

  In addition, although the transmission antenna 12 including the side portions included in the two different planes PL1 and PL2 has been described, the transmission antenna may have a configuration including the side portions included in three or more planes. . As an example, a transmission antenna 12A having side portions included in three planes will be described with reference to FIG.

  The transmitting antenna 12A is a conductor wire disposed along the joint portion of the side wall A1, the wall surface 5c and the lower wall surface 5a, which is composed of the conductor wire 6 disposed along the joint portion between the two wall surfaces 5c and 5f of the room 5. 6 and a conductor 6 arranged along a path (diagonal line of the wall surface 5d) from the end of the side portion A2 on the wall surface 5d side to the upper end of the joint between the two wall surfaces 5d and 5e. Consists of conducting wires 6 arranged along a path from the upper end of the joining portion of the side portion A3, the wall surface 5d and the wall surface 5e to the site (point) B near the wall surface 5f in the joining portion of the wall surface 5e and the lower wall surface 5a. Along the side A4, the side A5 composed of the conductor 6 disposed along the path from the part B to the lower end of the joint between the wall surface 5e and the wall surface 5f, along the joint between the wall surface 5e and the wall surface 5f. Side composed of the arranged conductor 6 A6, and is provided with a configured side portion A7 in conductor 6 which is disposed along the junction of the wall 5f and the upper wall surface 5b.

  In addition, the transmission antenna 12A configured by winding the conducting wire 6 so as to surround the room 5 in this way constitutes another part of the side parts A1, A6, and A7 that constitute a part of the transmission antenna 12A. Sides A3 and A4 are straight lines with a plane PL1 (a plane including the lower wall surface 5a. A plane as a hatched first surface) including the other sides A2 and A5 constituting the remaining part of the transmitting antenna 12A. The side A1 is positioned so as to be located in a plane (another plane as the second surface) PL2 intersecting with L1 and in a plane (a plane as the other second surface) PL3 intersecting with the plane PL1 and the straight line L2. , A6, and A7, a part of the transmission antenna 12A is connected to the straight line L1 (the wall surface 5f and the lower wall surface 5a with respect to the other side portions A2 and A5 (the plane PL1 including the other side portions A2 and A5). Part), and side A3 For some configured transmitting antenna 12A in 4 it is configured by bending in the other side portion A2 linearly relative (plane PL1) L2 (line indicated by the continuous lines in FIG. 5).

  When the part (point) B moves in the direction of the wall surface 5f and reaches the lower end of the joint between the wall surface 5e and the wall surface 5f, the side portion A5 defining the plane PL1 together with the side portion A2 disappears. . Therefore, in this configuration, the transmission antenna 12A includes side portions (side portions A1, A6, A7 and side portions A3, A4) included in two planes PL2 and PL3 that intersect with each other below the lower wall surface 5a. It becomes the composition.

  Further, the transmitting antenna 12A is plane-symmetric with respect to the portion formed by the side portions A1, A5, and A6, but the side portions A3 and A4 are configured by the side portions A3 and A4 because their lengths are different from each other. The portion to be processed is non-plane symmetric. For this reason, the transmitting antenna 12A has a non-plane symmetry structure as a whole.

  Therefore, this transmitting antenna 12A is also provided with sides included in different planes PL1, PL2, and PL3, and is configured in a non-symmetrical structure as a whole in the same manner as the transmitting antenna 12 described above. As a result of being able to be coupled to the receiving antenna 21 of the power receiving apparatus 3 with a certain degree of coupling (medium degree or higher coupling) at all times without being greatly affected by the direction and position of the power receiving apparatus 3 located at Occurrence of a situation in which the degree of coupling of the power receiving device 3 with the receiving antenna 21 becomes extremely small due to the orientation and position of the power receiving device 3 can be reliably avoided.

  In addition, the transmission antennas 12 and 12A having side portions included in different planes have been described, but the transmission antenna includes a side portion included in each of the plane and the curved surface, and is included in different curved surfaces. A configuration including a side portion can also be adopted. As an example, a transmitting antenna 12B having a curved surface and sides included in the plane will be described with reference to FIG.

  The transmission antenna 12B is configured by winding only the wall surface 5f in the above-described room 5 around the room 51 formed as a curved surface as shown in FIG. 6, and the two wall surfaces 5c and 5f of the room 51 are wound around the room 51. Side A1 composed of the conductive wire 6 disposed along the joint portion, side portion A2 composed of the conductive wire 6 disposed along the joint portion of the wall surface 5c and the lower wall surface 5a, and the wall surface 5d of the side portion A2. Joining of side part A3, wall surface 5e, and upper wall surface 5b composed of conducting wire 6 arranged along a path (diagonal line of wall surface 5d) from the end on the side to the upper end of the joint portion of two wall surfaces 5d and 5e The side part A4 comprised by the conducting wire 6 arrange | positioned along the part and the side part A5 comprised by the conducting wire 6 arrange | positioned along the junction part of the wall surface 5f and the upper wall surface 5b are provided.

  Further, in the transmission antenna 12B configured by winding the conducting wire 6 so as to surround the room 51 in this way, the side portions A1 and A5 constituting a part of the transmission antenna 12B constitute the remaining part of the transmission antenna 12B. The curved line lies in a curved surface CU1 that intersects the plane PL1 (the plane as the first surface with diagonal lines) including the other sides A2, A3, and A4 and the curve L1 (curved line indicated by the alternate long and short dash line). It is configured by being bent at L1 (it can be said that it is configured by being bent by a straight line (not shown) connecting both ends of the curve L1). In addition, the transmitting antenna 12B is plane symmetric with respect to the portion formed by the side portions A2, A3, and A4, but the side portions A1 and A5 have different lengths and different shapes (one is a straight line). And the other is a curved line), so that the portion constituted by the side portions A1 and A5 is non-plane symmetric. For this reason, the transmitting antenna 12B is configured as a non-plane-symmetric structure as a whole.

  Therefore, similarly to the above-described transmission antennas 12 and 12A, the transmission antenna 12B also includes a side part included in a plane or curved surface (in this example, the curved surface CU1 as the second surface) different from the plane PL1, and is non-hollow as a whole. Since it is configured in a plane-symmetric structure, power is always received with a certain degree of coupling (medium degree or higher degree of coupling) without being greatly affected by the direction and position of the power receiving device 3 located in the room 51. As a result of being able to be coupled to the receiving antenna 21 of the device 3, it is possible to reliably avoid the occurrence of a situation in which the degree of coupling of the power receiving device 3 with the receiving antenna 21 becomes extremely small due to the orientation and position of the power receiving device 3. can do.

  Further, the transmission antennas 12, 12A, and 12B configured by winding the conductive wire 6 for one turn or two or more turns have been described. However, in the configuration in which the conductive wire 6 is wound for two or more turns, the conductive wire 6 for at least one turn is provided. In the same manner as the transmission antennas 12, 12 </ b> A, and 12 </ b> B described above, one or more side portions constituting a part thereof and other side portions constituting the remaining portion are respectively located in planes intersecting with each other. In addition, the transmission antenna as a whole may have a non-symmetrical structure so that the transmission antenna is located on a plane and a curved surface that intersect with each other, or further disposed on a curved surface that intersects each other. it can.

  The transmission antenna 12 as an example will be described with reference to FIG. As shown in FIG. 7, the transmitting antenna 12C is provided around a room 52 formed by forming the lower wall surface 5a, the upper wall surface 5b, and the wall surfaces 5c, 5d, 5e, and 5f in the above-described room 5 into the same square shape. The conductive wire 6 is wound for two turns, and for one turn (first turn), a side portion composed of the conductive wire 6 disposed along the joint between the wall surface 5c of the room 52 and the lower wall surface 5a. A1, a side composed of a conductive wire 6 disposed along a joint portion between the wall surface 5d and the lower wall surface 5a, and a side composed of a conductive wire 6 disposed along a joint portion between the two wall surfaces 5d and 5e. Side A4 composed of the conductor 6 disposed along the joint between the portion A3, the wall surface 5e and the upper wall 5b, and the conductor 6 disposed along the joint between the two wall surfaces 5e and 5f. Side A5 and wall surface 5f and below And a composed side portion A6 in conductor 6 which is disposed along the junction of the surface 5a.

  Further, for one turn (first turn) of the transmitting antenna 12C configured as described above, the side portions A3, A4 and A5 constituting a part thereof constitute the remaining portion for the one turn. Fold along a straight line L1 so as to be located in a plane PL2 as a second surface that intersects the plane PL1 (the first surface including the lower wall surface 5a) including the other sides A1, A2, A6 at the straight line L1. It is composed by being bent.

  In addition, the remaining one turn (second turn) is disposed so as to overlap the side A7 constituted by the conductive wire 6 disposed so as to overlap the side A1 of the first turn and the side A2 of the first turn. Conductor 6 arranged along a side (diagonal line of wall surface 5e) from side A8 composed of conductive wire 6 and the end of side A8 on the wall surface 5e side to the upper end of the joint of two wall surfaces 5e, 5f. And a conductor 6 arranged along a path (diagonal line of the wall surface 5f) from the end of the side wall 9f on the wall surface 5f side to the lower end of the joint portion of the two wall surfaces 5f, 5c. Side A10.

  Further, for the remaining one turn (second turn) of the transmitting antenna 12C configured as described above, the side portions A7 and A10 constituting a part thereof constitute the remaining portion for the one turn. The straight line L2 is positioned so as to be located in the plane PL3 as the other second surface that intersects with the plane PL4 as the other first surface including the other sides A8 and A9 at the straight line L2 (straight line indicated by the alternate long and short dash line). It is bent and composed.

  In addition, the transmitting antenna 12C configured by the first turn and the second turn has a symmetrical structure in both the first turn and the second turn, but the shape is different between the first turn and the second turn. In addition, because of the configuration in which the respective symmetry planes intersect (that is, the configuration in which the entire transmission antenna 12C has no symmetry plane), the overall configuration is a non-plane symmetry.

  Therefore, the transmission antenna 12C is also not less influenced by the direction and position of the power receiving device 3 located in the room 52, and is always more than a certain degree of coupling, similarly to the transmission antennas 12, 12A, 12B. As a result of being able to couple to the receiving antenna 21 of the power receiving device 3 with (medium or higher degree of coupling), the degree of coupling of the power receiving device 3 with the receiving antenna 21 is extremely high due to the orientation and position of the power receiving device 3. Occurrence of such a situation that it becomes smaller can be avoided reliably.

  In addition, as described above, the transmission antenna may have a configuration including sides that are included in different curved surfaces. For example, in the transmission antenna 12B illustrated in FIG. 6, the sides A2, A3, and A4 are provided. By forming the plane PL1 including a curved surface including sides A2, A3a (sides indicated by bold broken lines) and A4, the transmitting antenna includes the curved surface intersecting each other and the side included in the curved surface CU1. Can also be configured.

  In the above example, a transmission antenna having a configuration including two or more sides in one plane or curved surface has been described. Although not illustrated, for example, one arc-shaped side of an annular coil By bending the remaining one arc-shaped side portion, a transmitting antenna constituted by two side portions respectively included in two curved surfaces (first surface and second surface) intersecting each other is formed. You can also.

  Further, each of the transmission antennas 12, 12A, 12B, 12C, the power transmission device 2, and the power transmission device 1 is not limited to the case where the portable terminal is the power reception device 3, but various electric devices (electric razor, electric The present invention can also be applied to the case where the power receiving device 3 is a toothbrush, a battery-driven vehicle, or the like.

DESCRIPTION OF SYMBOLS 1 Electric power transmission apparatus 2 Power transmission apparatus 3 Power receiving apparatus 4 Battery A1-A10 Side part 6 Conductor 11 Signal generation part 12 Transmission antenna 13 1st matching part 21 Reception antenna 22 2nd matching part 23 Rectification part PL1-PL4 Plane S1 AC signal V1 Induction voltage Vo DC voltage

Claims (4)

  One or more sides constituting one part of the conducting wire for one turn constituting an annular coil constituted by winding the conducting wire for one turn or two or more turns constitute the remaining part of the conducting wire for one turn. For power transmission, which is located in the second surface of any one of the plane and the curved surface intersecting the first surface of either the flat surface or the curved surface including other sides, and is configured as a non-symmetrical structure as a whole antenna. The annular coil is formed by winding the conductive wire over two turns or more,
The one or more side portions constituting a part of the annular coil are configured to be located in the second surface intersecting the first surface including the other side portions constituting the remaining part of the annular coil. The antenna for power transmission according to claim 1.   The power transmission antenna according to claim 1 or 2, a signal generation unit that generates an AC signal and outputs the AC signal to the power transmission antenna, and is disposed between the power transmission antenna and the signal generation unit. A power transmission device including the power transmission antenna and a matching unit that matches the signal generation unit. A power transmission device according to claim 3;
A power receiving antenna that electromagnetically couples with the power transmission antenna of the power transmission device to generate an AC voltage, and a DC voltage generator that rectifies and smooths the AC voltage generated in the power receiving antenna and generates a DC voltage. A non-contact power transmission device comprising: a power receiving device including:

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