JP5465484B2 - Power transmission device and contactless power transmission system - Google Patents

Description

The present invention, the power transmission device including a transmission antenna that is used for power transmission, to a contactless power transmission system provided with a transmission equipment in our whistle.

  As this type of contactless power transmission system, a contactless power transmission system used in a data carrier system disclosed in Patent Document 1 below is known. The data carrier system includes a power receiving device (responder) and a power transmitting device (interrogator) that transmits a high-frequency carrier wave to transmit power to the power receiving device and transmits / receives data to / from the power receiving device. Yes. In addition, the power transmission device includes a monitoring unit for monitoring the strength of power transmitted from an antenna (specifically, a coil functioning as an antenna) and a matching for impedance matching between the antenna and the transmission circuit. Means and a conversion table means for instructing a plurality of capacitors arranged in the matching means as a continuous combined capacity. Therefore, according to this contactless power transmission system, the intensity of power transmitted from the antenna is monitored by the monitoring means, and based on this, the capacitor combined capacity of the matching means is adjusted to obtain the largest power. Since it can be matched to a point, it is possible to shift to an optimum matching state with respect to variations in manufacturing of the antenna, changes with time, changes in humidity and temperature, and the like.

Japanese Patent Laid-Open No. 10-303790 (page 2-4, FIG. 1)

  By the way, in the conventional contactless power transmission system used in the data carrier system described above, the inductance of the coil constituting the antenna is fixed, and the combined capacity of the plurality of capacitors arranged in the matching means is adjusted. However, there is also a demand for a configuration in which the matching state is changed by changing the inductance of the coil constituting the antenna.

The present invention has been made to solve the above problems, the power transmitting apparatus inductance of the coil with a transmission antenna can be changed to provide a contactless power transmission system provided with a transmission equipment in our Yobuko The main purpose.

Power transmission device according to claim 1, wherein to achieve the above object, the conductor line antenna element at least part of the region to each other is formed in parallel of those conductor lines are formed in the formed co-looped , the conductor line interposed a capacitor, a pair of contacts for contacting respective said parallel each part, and by sliding the same time the pair of contacts along the parallel each part, of the pair It comprises a transmitting antenna and a slide Organization for changing the contact position of the parallel each part of the contact, and a signal generating unit for supplying an AC signal to the antenna element via the pair of contacts .

To achieve the above object, a non-contact power transmission system according to claim 2 is configured by the power transmission device according to claim 1 and a conductor line formed in a loop shape, and at least a part of the conductor line. An antenna element formed in parallel with each other, a capacitor interposed in the conductor line, a pair of contacts in contact with the parallel parts, and the pair of contacts at the same time along the parallel parts A receiving antenna provided with a slide mechanism that changes the contact position of the pair of contacts with the parallel parts by sliding, and an AC signal generated between the pair of contacts of the receiving antenna is a DC voltage. conversion to and a power receiving device includes a DC voltage generating unit for outputting to.

According to the power transmission device of the first aspect, the position of each contact with respect to each parallel part of the antenna element can be finely adjusted simultaneously by sliding the pair of contacts with the slide mechanism. And the transmitting antenna can be finely adjusted reliably and easily.

According to the non-contact power transmission system according to claim 2 , even if the power receiving device is arranged at various distances with respect to the power transmitting device, each antenna element is provided by each slide mechanism in both the power transmitting device and the power receiving device. The position of each contact with respect to each parallel part in the can be fine-tuned, and it is always possible to make a pinpoint transition to the matching state according to the distance between each device, so that power transmission is always performed with high efficiency Can do. Moreover, according to this power transmission system, the range of the distance between the power transmission device and the power reception device that can transmit power satisfactorily can be sufficiently widened.

1 is a configuration diagram showing a configuration of a power transmission system 1. FIG. 2 is a perspective view showing configurations of a transmission antenna 12 and a reception antenna 41. FIG. It is a perspective view which shows the structure of the slide mechanisms 25 and 55. FIG. It is explanatory drawing for demonstrating the other structure of the transmission antenna.

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

  A contactless power transmission system (hereinafter also simply referred to as “power transmission system”) 1 shown 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 to receiving power, the received power can be output to a 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 antenna (hereinafter also referred to as “transmission antenna”) 12. The signal generator 11 generates an AC signal S1 and outputs it between a pair of contacts 23 and 24, which will be described later, connected via a pair of wiring members 13 and 14.

  As shown in FIGS. 1, 2, and 3, the transmission antenna 12 includes an antenna element 21, a capacitor 22, a pair of contacts 23 and 24, and a slide mechanism 25. As an example, the antenna element 21 includes a loop-shaped conductor pattern (an example of a conductor line) 27 formed on the surface of a circuit board 26 as shown in FIG. In this case, as shown in the figure, the conductor pattern 27 is formed such that at least some of the portions 27a and 27b are parallel to each other. In this example, as an example, the conductor pattern 27 is formed in a square shape (square or rectangular) in plan view, so that the portions 27a and 27b constituting a pair of opposing sides are formed in parallel. Hereinafter, the respective portions 27a and 27b are also referred to as parallel portions 27a and 27b. Note that the planar shape of the conductor pattern 27 is not limited to a square, and as long as at least some of the portions are formed in parallel, the shape of the remaining portions may be any shape such as an arc shape or a square shape. It can be a shape.

  The capacitor 22 is interposed in the conductor pattern 27 as shown in FIG. Specifically, as shown in FIG. 2, the capacitor 22 is formed such that a part of the conductor pattern 27 is formed at an open end, and is connected across the open end. In the figure, a chip capacitor is used as the capacitor 22, but it goes without saying that a capacitor having a lead terminal may be used. The pair of contacts 23 and 24 are formed into an elastic tongue piece as an example using a conductive material. Further, as will be described later, the contact 23 comes into contact with one parallel portion 27 a of the conductor pattern 27, and the contact 24 comes into contact with the other parallel portion 27 b of the conductor pattern 27.

  As an example, the slide mechanism 25 includes a slide member 31 and a pair of guide rails 32 and 33 as shown in FIGS. In this case, as an example, the slide member 31 is composed of a rod-like body having both ends formed in a T shape in plan view. The pair of guide rails 32 and 33 are arranged on the surface side of the circuit board 26 where the conductor pattern 27 is formed, in parallel with the parallel portions 27a and 27b and at a distance from the surface. In addition, the pair of guide rails 32 and 33 has one end portion of the slide member 31 accommodated in the concave groove 32a of the guide rail 32 disposed on the parallel portion 27a side, and is disposed on the parallel portion 27b side. The other end of the slide member 31 is accommodated in the concave groove 33a of the guide rail 33, so that the slide member 31 is slidably held in a state perpendicular to the parallel portions 27a and 27b of the conductor pattern 27. doing. A pair of contacts 23 and 24 extend in the direction of the parallel portions 27a and 27b at the same interval as the parallel portions 27a and 27b on the inner side of each end portion of the slide member 31. The tip is in contact with the parallel part 27a, and the tip of the contactor 24 is attached in contact with the parallel part 27b. With this configuration, the slide mechanism 25 changes the contact position of each contactor 23, 24 with respect to the parallel portions 27a, 27b by sliding the slide member 31 in the direction of the arrow (the direction along the parallel portions 27a, 27b). Let

  As shown in FIG. 1, the power receiving device 3 includes a receiving antenna (hereinafter also referred to as “receiving antenna”) 41 and a DC voltage generating unit 42, and is configured to output a DC voltage V <b> 1 to the load 4. ing.

  As shown in FIGS. 1, 2, and 3, the receiving antenna 41 includes an antenna element 51, a capacitor 52, a pair of contacts 53 and 54, and a slide mechanism 55. The basic configuration is the same as that of the transmitting antenna 12. Yes. As an example, the antenna element 51 includes a loop-shaped conductor pattern (an example of a conductor line) 57 formed on the surface of the circuit board 56 as shown in FIG. In this case, as shown in the figure, the conductor pattern 57 is formed such that at least some of the portions 57a and 57b are parallel to each other. In this example, similarly to the transmission antenna 12, the conductor pattern 57 is formed in a square shape in plan view, so that the portions 57a and 57b constituting a pair of opposing sides are formed in parallel. Hereinafter, the respective portions 57a and 57b are also referred to as parallel portions 57a and 57b. Note that the planar shape of the conductor pattern 57 is not limited to a square shape as in the case of the conductor pattern 27, and as long as at least some of the portions are formed in parallel, the shape of the remaining portions is The shape can be any shape such as an arc shape or a square shape.

  The capacitor 52 is interposed in the conductor pattern 27 as shown in FIG. Specifically, as shown in FIG. 2, in the capacitor 52, a part of the conductor pattern 57 is formed at an open end, and is connected across the open end. The pair of contacts 53 and 54 are formed into an elastic tongue piece as an example using a conductive material. Further, as will be described later, the contact 53 contacts one parallel portion 57 a of the conductor pattern 57, and the contact 54 contacts the other parallel portion 57 b of the conductor pattern 57.

  As an example, the slide mechanism 55 includes a slide member 61 and a pair of guide rails 62 and 63 as shown in FIGS. In this case, as an example, the slide member 61 is composed of a rod-like body having both ends formed in a T shape in plan view. The pair of guide rails 62 and 63 are arranged on the surface side of the circuit board 56 on which the conductor pattern 57 is formed, in parallel with the parallel portions 57a and 57b and at a distance from the surface. Further, the pair of guide rails 62, 63 are disposed on the side of the parallel part 57b, with one end of the slide member 61 being accommodated in a concave groove 62a of the guide rail 62 provided on the side of the parallel part 57a. The other end of the slide member 61 is accommodated in the groove 63a of the guide rail 63, so that the slide member 61 is slidably held in a state perpendicular to the parallel portions 57a and 57b of the conductor pattern 57. doing. A pair of contacts 53, 54 extend at the same interval as the parallel portions 57 a, 57 b and in the direction of the parallel portions 57 a, 57 b on the inner side of each end of the slide member 61. The tip is in contact with the parallel part 57a, and the tip of the contactor 54 is attached in contact with the parallel part 57b. With this configuration, the slide mechanism 55 changes the contact position of each contactor 53, 54 with respect to the parallel portions 57a, 57b by sliding the slide member 61 in the direction of the arrow (the direction along the parallel portions 57a, 57b). Let

  The DC voltage generator 42 includes, as an example, a rectifier circuit and a smoothing circuit (both not shown). Further, the DC voltage generation unit 42 is connected to the contacts 53 and 54 via the pair of wiring members 43 and 44 and is generated in the coil portion that constitutes the antenna element 51 located between the contacts 53 and 54. The AC voltage is rectified and smoothed to generate a DC voltage V1.

  Next, the operation of the power transmission system 1 will be described. As an example, an example in which the power receiving device 3 connected to the battery 4 is moved together with the battery 4 to the vicinity of the power transmitting device 2 to charge the battery 4 in a state where the power transmitting device 2 is disposed in advance at a predetermined position. explain.

  In this 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 slide mechanism 25 on the transmission antenna 12 side is operated to transmit the transmission antenna 12 on the power transmission device 2 side. The matching state of the receiving antenna 41 is moved to a good state, and the sliding mechanism 55 on the receiving antenna 41 side is operated to shift the matching state of the receiving antenna 41 on the power receiving device 3 side to a good state.

  Specifically, while the voltage value of the DC voltage V <b> 1 output from the DC voltage generator 42 to the load 4 is monitored, the slide member 31 of the slide mechanism 25 is slid to contact the contact 23 of the antenna element 21. And the inductance of the coil portion L1 between one open end to which the capacitor 22 is connected and the coil portion L2 between the contact position of the contact 24 on the antenna element 21 and the other open end to which the capacitor 22 is connected. By simultaneously changing the inductance and the inductance of the coil portion L3 between the pair of contacts 23 and 24 in the antenna element 21, the impedance of the antenna element 21 is changed, and the slide member 61 of the slide mechanism 55 is slid. The contact position of the contact 53 in the antenna element 51 and the capacitor 52 are connected. The inductance of the coil portion L4 between the open end of the coil portion, the inductance of the coil portion L5 between the contact position of the contact 54 on the antenna element 51 and the other open end to which the capacitor 52 is connected, and the pair of the antenna element 51 By changing the inductance of the coil portion L6 between the contacts 53 and 54 at the same time and changing the impedance of the antenna element 51, the matching state is shifted to a good state. In the antenna elements 21 and 51 of this example, the impedance is increased by sliding the slide members 31 and 61 toward the capacitors 22 and 52.

  In the power transmission system 1, the slide mechanisms 25 and 55 can finely adjust the positions of the contacts 23 and 24 with respect to the antenna element 21 and the positions of the contacts 53 and 54 with respect to the antenna element 51. The power transmission device 2 and the power reception device 3 can be pinpointed to a good matching state. Therefore, even if the power receiving device 3 is arranged at various distances with respect to the power transmitting device 2, not only the power transmitting device 2 but also the power receiving device 3 is always good according to the length of the distance between the devices 2 and 3. As a result, the range of the distance between the power transmitting device 2 and the power receiving device 3 that can transmit power with high efficiency is expanded.

  Next, the power of the AC signal S1 output from the signal generator 11 is increased to a specified power. As a result, power is transmitted from the power transmitting device 2 to the power receiving device 3 with high efficiency, and as a result, the DC voltage V1 is output to the load (battery) 4 with high efficiency (the battery is charged). )

  As described above, in this transmission antenna 12, the parallel portions 27 a and 27 b are formed on at least a part of the transmission antenna 12 constituted by the loop-shaped conductor pattern 27, and the slide mechanism 25 contacts the parallel portions 27 a and 27 b, respectively. The pair of contacts 23 and 24 are configured to be slidable along the parallel portions 27a and 27b. Also, in this receiving antenna 41, parallel portions 57a and 57b are formed in at least a part of the receiving antenna 41 formed of the loop-shaped conductor pattern 57, and a pair of contacts that respectively contact the parallel portions 57a and 57b by the slide mechanism 55. Are configured to be slidable along the parallel portions 57a and 57b.

  Therefore, according to the transmission antenna 12 and the reception antenna 41, the positions of the contacts 23 and 24 with respect to the antenna element 21 are finely adjusted simultaneously by sliding the slide members 31 and 61 of the slide mechanisms 25 and 55. In addition, the positions of the contacts 53 and 54 with respect to the antenna element 51 can be finely adjusted simultaneously. That is, the impedance of each antenna 12, 41 can be finely adjusted reliably and easily.

  Further, according to the power transmission device 2 including the transmission antenna 12, as described above, since the positions of the contacts 23 and 24 with respect to the antenna element 21 can be finely adjusted simultaneously, the signal generator 11 and the transmission antenna 12 can be adjusted. Can be finely adjusted reliably and easily. Further, according to the power receiving device 3 including the receiving antenna 41, as described above, the positions of the contacts 53 and 54 with respect to the antenna element 51 can be finely adjusted simultaneously. 42 can be finely adjusted reliably and easily.

  Further, according to the power transmission system 1 including the power transmission device 2 and the power reception device 3, even if the power reception device 3 is arranged at various distances with respect to the power transmission device 2, the power transmission device 2 and the power reception device 3 By operating the slide members 31 and 61 of the slide mechanisms 25 and 55 on both sides, the positions of the contacts 23 and 24 with respect to the antenna element 21 and the positions of the contacts 53 and 54 with respect to the antenna element 51 are finely adjusted. And since it can always be made to shift to the alignment state according to the length of the distance between each apparatus 2 and 3 pinpoint, electric power transmission can always be performed with high efficiency. Moreover, according to this power transmission system 1, the range of the distance between the power transmission apparatus 2 and the power receiving apparatus 3 which can transmit electric power satisfactorily can be expanded sufficiently.

  Note that the present invention is not limited to the configuration shown in the above embodiment. For example, the example in which the antenna elements 21 and 51 are configured in one turn has been described above, but it is needless to say that the antenna elements 21 and 51 may be configured in a plurality of turns of two or more turns. As an example, a schematic diagram of an example in which the antenna element 21 of the transmission antenna 12 is configured to have three turns is shown in FIG. Also in this configuration, the contact members 23 and 24 are brought into contact with the pair of parallel portions 27a and 27b in the conductor pattern 27 constituting the antenna element 21, and the slide member 31 of the slide mechanism 25 to which the both contacts 23 and 24 are attached is provided. By sliding the, the impedance of the antenna element 21 can be finely adjusted. In addition, the conductor pattern 27 shown with the broken line in FIG. 4 is the conductor pattern 27 formed in the back surface side of the circuit board 26, and is connected with the conductor pattern 27 of the surface side through the through hole (white circle). The guide rails 32 and 33 are not shown in the figure. Although not shown, the receiving antenna 41 can be changed by sliding the contact positions of the contacts 53 and 54 with the slide mechanism 55 while configuring the antenna element 51 in a plurality of turns. It can be.

  Moreover, although the antenna element 21 (51) has been described above with respect to the example in which the conductor pattern 27 (57) is configured on the surface of the circuit board 26 (56), the antenna element 21 (51) can also be configured using a wiring material. In this configuration, for the parallel portions 27a and 27b (57a and 57b), at least the conductive wires of the parallel portions 27a and 27b (57a and 57b) are exposed, and the contacts 23 and 24 (53 and 54) are brought into contact with the conductive wires. The structure to be made can be adopted. Moreover, each slide mechanism 25 and 55 is not limited to an above-described structure, A various structure is employable. Further, each of the contacts 23, 24, 53, and 54 can have various shapes other than the elastic tongue piece. Moreover, although each capacitor | condenser 22 and 52 was described above about the example comprised with one capacitor | condenser, it can also comprise by connecting a some capacitor | condenser in series or in parallel.

DESCRIPTION OF SYMBOLS 1 Electric power transmission system 2 Power transmission apparatus 3 Power receiving apparatus 11 Signal generation part 12 Transmitting antenna 21,51 Antenna element 22,52 Capacitor 23,24,53,54 Contactor 25,55 Slide mechanism 27,57 Conductor pattern 27a, 27b, 57a , 57b Parallel part 41 Receiving antenna 42 DC voltage generator S1 AC signal V1 DC voltage

Claims (2)

Antenna element in which at least a portion of the site to each other are formed in parallel in the conductor lines are looped in the form has been constructed and co those conductor lines, capacitor interposed in the conductor lines, the parallel a pair of contacts that contact the respective site, and by sliding the same time the pair of contacts along the parallel each part, slide to change the contact position of the parallel each part of the pair of contacts and a transmission antenna that has a machine configuration,
A power transmission device comprising: a signal generation unit that supplies an AC signal to the antenna element via the pair of contacts . A power transmission device according to claim 1 ;
An antenna element in which a conductor line is formed in a loop shape and at least part of the conductor line is formed in parallel with each other, a capacitor interposed in the conductor line, and a contact with each parallel part And a sliding mechanism that changes the contact position of the pair of contacts with respect to the parallel parts by simultaneously sliding the pair of contacts along the parallel parts. receiving antenna and contactless power transmission system and a receiving apparatus comprising a DC voltage generator that converts a DC voltage to an AC signal generated between said pair of contact child of the reception antennas.

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