JP2017184561A - Non-contact power transmission system and power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system capable of suppressing that an electric power to be received is largely changed depending on a received electric power position on parallel two lines.SOLUTION: A non-contact power transmission system 1A comprises a power transmission unit 22 in which a power transmission device 2 includes parallel two lines in which two conductive lines 22a and 22b are provided in parallel; and a high-frequency electric power device 21 that supplies a high-frequency electric power to the power transmission unit 22. A power reception device 3 comprises: a first power reception unit 31 that includes a magnetic field antenna 31a magnetically coupled to the parallel two lines, a resonance capacitor 31b, and a rectification filter circuit 31c; a second power reception unit 32 that includes electric field antennas 32a and 32b electrically coupled to the parallel two lines, a resonance coil 32c, and a rectification filter circuit 32d; and a synthesis part that synthesizes a DC electric power outputted by the first power reception unit 31 and the DC power outputted by the second power reception unit 32, and supplies to a load 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-contact power transmission system that performs power transmission in a non-contact manner using parallel two lines, and a power receiving apparatus.

  A method has been developed in which the power output from the power source is transmitted to the load in a contactless manner without directly connecting the load and the power source. This technique is generally called non-contact power transmission or wireless power feeding. This technology is applied to power supply to mobile phones, home appliances, electric vehicles and the like.

  For example, Patent Document 1 describes a non-contact power transmission system that supplies high-frequency power to parallel two lines in which two conductor wires are laid in parallel, and magnetically couples a coil of a power receiving unit to the parallel two lines. Yes. In the non-contact power transmission system, in order to reduce the size and weight of the power receiving device, high-frequency power having a wavelength of about 10 to 100 [m] (frequency is 3 to 30 [MHz]) (for example, 13.56 [MHz]) is used. To transmit.

JP 2014-183668 A

  When the line length of the parallel two lines is 100 [m] or more, the wavelength cannot be ignored for the line length, so it is necessary to treat the parallel two lines as a distributed multiplier circuit. In this case, the traveling wave and the reflected wave are overlapped on the two parallel lines to generate a standing wave. Therefore, the intensity of the magnetic field in the vicinity of the parallel two lines varies greatly depending on the position in the direction in which the parallel two lines extend. That is, the power that can be received by the power receiving device changes depending on the position on the parallel two lines where the power is received, and the received power is greatly reduced in the vicinity of the valley position of the current standing wave.

  The present invention has been conceived under the circumstances described above, and an object thereof is to provide a non-contact power transmission system capable of suppressing a large change in received power depending on a power receiving position on two parallel lines. It is said.

  In order to solve the above problems, the present invention takes the following technical means.

  A non-contact power transmission system provided by the first aspect of the present invention is a non-contact power transmission system that non-contactly transmits power from a power transmission device to a power reception device, and the power transmission device includes two conductors. A power transmission unit having parallel two lines in which lines are installed in parallel; and a high-frequency power supply device that supplies high-frequency power to the power transmission unit, wherein the power reception device is magnetically coupled to the parallel two lines And a resonant capacitor connected to the magnetic field antenna; a first power receiving unit having a first rectifier circuit that converts high frequency power received by the magnetic field antenna into direct current power; and electric coupling to the parallel two lines. A first electric field antenna; a resonance coil connected to the electric field antenna; and a second rectifier circuit that converts high-frequency power received by the electric field antenna into direct-current power. A power receiving unit, the DC power and by synthesizing the DC power and the second power receiving unit first power receiving unit is outputted to the output, characterized by comprising a supplying synthesis part load. According to this configuration, the electric power received by the magnetic field antenna and the electric power received by the electric field antenna are rectified and combined, and supplied to the load. Since the current standing wave and the voltage standing wave on the two parallel lines are out of phase by 90 °, the power received by the magnetic field antenna and the power received by the electric field antenna can complement each other. Thereby, it can suppress that received electric power changes greatly by the receiving position on a parallel 2 line.

  In a preferred embodiment of the present invention, each of the lines has a strip shape, the magnetic field antenna includes a coil, and the electric field antenna includes two conductor plates. According to this configuration, it is possible to increase the capacitance of the capacitor formed by each strip-shaped line and each conductor plate of the electric field antenna.

  In a preferred embodiment of the present invention, the electric field antenna and the magnetic field antenna are disposed at substantially the same position in the direction in which the two parallel lines extend. According to this configuration, since the electric field antenna and the magnetic field antenna receive power at substantially the same position, it is difficult for the complementary relationship between the power received by the magnetic field antenna and the power received by the electric field antenna to occur.

  In a preferred embodiment of the present invention, the electric field antenna is disposed closer to the parallel two lines than the magnetic field antenna. According to this configuration, the electrostatic capacity can be increased by shortening the distance between the electric field antenna and the parallel two lines.

  In a preferred embodiment of the present invention, the magnetic field antenna is disposed between two conductor plates of the electric field antenna. According to this configuration, the coil surface of the magnetic field antenna can be brought closer to the coil surface of the power transmission coil constituted by two parallel lines, so that the coupling coefficient of both coils can be further increased. Moreover, the height dimension of the area | region which arrange | positions a magnetic field antenna and an electric field antenna can be made small.

  In a preferred embodiment of the present invention, the resonant capacitor is connected in series to the magnetic field antenna. According to this configuration, the first power receiving unit can be a series resonant circuit.

  In a preferred embodiment of the present invention, the resonant capacitor is connected in parallel to the magnetic field antenna. According to this configuration, the first power receiving unit can be a parallel resonant circuit.

  In a preferred embodiment of the present invention, the resonance coil is connected in series between one conductor plate of the electric field antenna and the second rectifier circuit. According to this configuration, the second power receiving unit can be a series resonant circuit.

  In a preferred embodiment of the present invention, the resonance coil is connected in parallel between the electric field antenna and the second rectifier circuit. According to this configuration, the second power receiving unit can be a parallel resonant circuit.

  In a preferred embodiment of the present invention, the combining unit connects the first power receiving unit and the second power receiving unit in parallel. According to this configuration, by outputting the higher voltage of the output voltage of the first power receiving unit and the output voltage of the second power receiving unit to the load, the power received by the first power receiving unit and the second power receiving unit received power. Power can be combined and output.

  In a preferred embodiment of the present invention, the combining unit connects the first power receiving unit and the second power receiving unit in series. According to this configuration, by combining the output voltage of the first power receiving unit and the output voltage of the second power receiving unit to a load, the power received by the first power receiving unit and the power received by the second power receiving unit are output. Can be synthesized and output.

  In a preferred embodiment of the present invention, the high frequency power supply device includes an impedance matching device. According to this configuration, the reflected wave power can be suppressed.

  In a preferred embodiment of the present invention, the parallel two lines are laid on a road or embedded in a road, the power receiving device is mounted on a car, and the magnetic field antenna and the electric field antenna are It is arranged on the bottom of the vehicle body. According to this configuration, when the vehicle equipped with the power receiving device travels on the road, the power transmitted by the parallel two lines can be received efficiently.

  The power receiving device provided by the second aspect of the present invention is a power receiving device that receives electric power transmitted in a non-contact manner from two parallel lines in which two conductor lines are installed in parallel. A first magnetic power receiving unit having a magnetic field antenna that is magnetically coupled to the magnetic field antenna, a resonant capacitor connected to the magnetic field antenna, and a first rectifier circuit that converts high-frequency power received by the magnetic field antenna into direct-current power; A second power receiving unit comprising: an electric field antenna that is electrically coupled to two lines; a resonance coil connected to the electric field antenna; and a second rectifier circuit that converts high-frequency power received by the electric field antenna into DC power; And a combining unit configured to combine the DC power output from the first power receiving unit and the DC power output from the second power receiving unit and supply the combined power to the load. According to this configuration, the electric power received by the magnetic field antenna and the electric power received by the electric field antenna are rectified and combined, and supplied to the load. Since the current standing wave and the voltage standing wave on the two parallel lines are out of phase by 90 °, the power received by the magnetic field antenna and the power received by the electric field antenna can complement each other. Thereby, it can suppress that received electric power changes greatly by the receiving position on a parallel 2 line.

  According to the present invention, the electric power received by the magnetic field antenna and the electric power received by the electric field antenna are rectified and combined, and supplied to the load. Since the current standing wave and the voltage standing wave on the two parallel lines are out of phase by 90 °, the power received by the magnetic field antenna and the power received by the electric field antenna can complement each other. Thereby, it can suppress that received electric power changes greatly by the receiving position on a parallel 2 line.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is the schematic which shows the non-contact electric power transmission system which concerns on 1st Embodiment. 1 is a circuit diagram illustrating an overall configuration of a contactless power transmission system according to a first embodiment. FIG. It is the schematic which shows the modification of the power receiving apparatus which concerns on 1st Embodiment. It is the schematic which shows the other modification of the power receiving apparatus which concerns on 1st Embodiment. It is a figure for demonstrating the non-contact electric power transmission system which concerns on 2nd Embodiment. It is a figure for demonstrating the non-contact electric power transmission system which concerns on 3rd Embodiment. It is the schematic which shows the modification of the non-contact electric power transmission system which concerns on 1st-3rd embodiment. It is the schematic which shows the other modification of the non-contact electric power transmission system which concerns on 1st-3rd embodiment.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings, taking as an example a case where a power receiving device is mounted on an electric vehicle.

  FIG. 1 is a schematic diagram showing a contactless power transmission system 1A according to the first embodiment. The figure (a) has shown the whole structure of non-contact electric power transmission system 1A, and has shown the state which looked at the electric vehicle which drive | works on a parallel two track | line from the top. FIG. 5B shows a state where the side of the electric vehicle is viewed (the internal description is partially omitted). FIG. 2 is a circuit diagram showing an overall configuration of the non-contact power transmission system 1A.

  As shown in FIGS. 1 and 2, the non-contact power transmission system 1 </ b> A includes a power transmission device 2 and a power reception device 3. The power transmission device 2 generates high-frequency power, and transmits the generated high-frequency power to the power receiving device 3 in a contactless manner. The power receiving device 3 receives the high-frequency power transmitted from the power transmitting device 2 in a contactless manner. The power receiving device 3 converts the received high frequency power into DC power and supplies it to the load 4. The load 4 is, for example, a power storage device, stores DC power supplied from the power receiving device 3, and supplies power to a motor or the like that drives the electric vehicle V. In addition, the electric vehicle V may not be provided with the power storage device and may directly drive a motor or the like with DC power supplied from the power receiving device 3. In this case, a motor or the like corresponds to the load 4.

  The power transmission device 2 includes a high frequency power supply device 21 and a power transmission unit 22.

  The high frequency power supply device 21 supplies high frequency power to the power transmission unit 22. The high-frequency power supply device 21 outputs high-frequency power having a certain magnitude. The high frequency power supply device 21 includes a DC power supply device 21a, an inverter circuit 21b, and an impedance matching device 21c.

  The DC power supply device 21a generates and outputs DC power. The DC power supply device 21a includes a rectifier circuit, a smoothing capacitor, and a DC-DC converter circuit. The DC power supply device 21a rectifies an AC voltage (for example, a commercial voltage 200 [V]) input from a commercial power source by a rectifier circuit and smoothes it by a smoothing capacitor, thereby converting it into a DC voltage. Then, it is converted into a DC voltage of a predetermined level (target voltage) by the DC-DC converter circuit and output to the inverter circuit 21b. The configuration of the DC power supply device 21a is not limited as long as it outputs a predetermined level of DC voltage.

  The inverter circuit 21 b converts DC power into high-frequency power, converts DC power input from the DC power supply device 21 a into high-frequency power, and outputs it to the power transmission unit 22. The inverter circuit 21b is, for example, a single-phase full bridge type inverter circuit, and includes four switching elements. In this embodiment, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is used as the switching element. The switching element is not limited to a MOSFET, but may be a bipolar transistor, an IGBT (Insulated Gate Bipolar Transistor), or the like.

The inverter circuit 21b receives a high-frequency control signal from a control circuit (not shown), and converts DC power into high-frequency power by switching an on state and an off state of each switching element in accordance with the high-frequency control signal. The high-frequency control signal is a pulse signal (which may be a sine wave signal or the like) that repeats a high level and a low level at a predetermined frequency f ₀ (for example, 13.56 [MHz]). Since the frequency f ₀ is a frequency for switching the switching element, it may be described as “switching frequency f ₀ ” below. The switching element is turned off when the high-frequency control signal is at a low level, and turned on when the high-frequency control signal is at a high level.

  A power sensor (not shown) for detecting output power is provided at the output end of the inverter circuit 21b. The control circuit performs feedback control so that the output power detected by the power sensor matches a predetermined target power. Specifically, the control circuit generates a control pulse signal for making the deviation between the output power detected by the power sensor and the set target power zero. Then, the control pulse signal is amplified by a drive circuit (not shown) and output to the inverter circuit 21b as a high frequency control signal. Thereby, the output power of the inverter circuit 21b is controlled to the set target power. The configurations of the inverter circuit 21b and the control circuit are not limited to those described above, and any configuration is possible as long as the output power can be controlled to the set target power.

  The impedance matching unit 21c suppresses reflected wave power input to the inverter circuit 21b. Depending on the position and number of electric vehicles V on the parallel two lines, the impedance of the high frequency power supply device 21 as viewed from the output side changes. The impedance matching unit 21c matches the impedance viewed from the output end of the inverter circuit 21b with the impedance viewed from the output end of the inverter circuit 21b to the DC power supply device 21a side, and is reflected at the output end of the inverter circuit 21b. Suppresses reflected wave power. The configuration of the impedance matching device 21c is not limited.

  Note that the configuration of the high-frequency power supply device 21 is not limited to that described above. The high frequency power supply device 21 only needs to output a predetermined high frequency power.

  The power transmission unit 22 transmits high-frequency power supplied from the high-frequency power supply device 21 to the first power reception unit 31 and the second power reception unit 32 of the power reception device 3, and includes lines 22a and 22b.

  The track 22a and the track 22b are strip-shaped conductors, and are laid on the surface of the road as two parallel tracks that are parallel to each other. In the present embodiment, copper plates having a thickness of about 0.1 mm to 1 cm and a width of about 1 cm to 10 cm are used as the line 22a and the line 22b. In addition, each dimension of the track | line 22a and the track | line 22b is not limited, A raw material is also not limited. Further, it may be embedded near the surface of the road instead of being laid on the surface of the road. The distance between the track 22a and the track 22b is about several centimeters to 1 meter, and is appropriately designed based on the width of the electric vehicle V used.

  The track 22a and the track 22b extend along the road on which the electric vehicle V runs. One end (the left end in FIG. 1A) of the line 22a is connected to one of the output terminals of the high frequency power supply device 21. In addition, one end of the line 22 b is connected to the other output terminal of the high frequency power supply device 21. The other end of the line 22a (the right end in FIG. 1A) and the other end of the line 22b are short-circuited. The parallel two lines composed of the line 22a and the line 22b function as a power transmission antenna that transmits power output from the high-frequency power supply device 21. The parallel two lines function as a power transmission coil Lt having a number of turns of one turn, and simultaneously function as two power transmission electrode plates 22a and 22b (see FIG. 2). In the present embodiment, the other end of the line 22a and the other end of the line 22b are short-circuited. However, the present invention is not limited to this, and may be insulated or connected via a specific impedance. Also good.

  The power receiving device 3 includes a first power receiving unit 31, a second power receiving unit 32, and a combining unit 33.

  The first power receiving unit 31 includes a magnetic field antenna 31a, a resonant capacitor 31b, and a rectifying / smoothing circuit 31c.

  The magnetic field antenna 31a is a coil having the same width as the line 22a and the line 22b, formed in a substantially rectangular C-shape in plan view, and having a number of turns of 1 coil. Are arranged so as to be substantially parallel to the road. The magnetic field antenna 31a functions as a power reception coil that is magnetically coupled to the power transmission coil Lt (parallel two lines including the line 22a and the line 22b) and receives power in a non-contact manner. In FIG. 1A, the width dimension of the copper plate forming the magnetic field antenna 31a is shown smaller than the actual size so that the overlapping state of the magnetic field antenna 31a, the electric field antennas 32a and 32b, and the lines 22a and 22b can be easily understood. doing. While the electric vehicle V is traveling, the portions of the magnetic field antenna 31a that are parallel to the traveling direction of the electric vehicle V overlap the line 22a and the line 22b, respectively, in plan view. In addition, the shape, dimension, and material of the magnetic field antenna 31a are not limited to this. The magnetic field antenna 31a preferably has a shape more linked to the magnetic flux that changes due to the current flowing through the power transmission coil Lt (parallel two lines including the line 22a and the line 22b). Accordingly, it is desirable that the size of the magnetic antenna 31a in the traveling direction of the electric vehicle V is larger. Further, the coil surface is preferably rectangular rather than circular. The number of turns of the magnetic field antenna 31a is not limited to one turn, and may be a plurality of turns. Further, the magnetic field antenna 31a may be formed of a copper wire instead of a copper plate.

  The resonance capacitor 31b is connected in series to the magnetic field antenna 31a to form a series resonance circuit.

The magnetic field antenna 31a and the resonance capacitor 31b are designed so that the resonance frequency matches the frequency f ₀ (switching frequency f ₀ ) of the high frequency power supplied from the high frequency power supply device 21. That is, the self-inductance L _R of the magnetic field antenna 31a and the capacitance C _R of the resonance capacitor 31b are designed so as to have the relationship of the following expression (1).

  The rectifying / smoothing circuit 31c converts high-frequency power received by the magnetic field antenna 31a into DC power. The rectifying / smoothing circuit 31c includes a full-wave rectifying circuit in which four diodes are bridge-connected. The rectifying / smoothing circuit 31c also includes a smoothing circuit for smoothing the rectified output. The configuration of the rectifying / smoothing circuit 31c is not limited as long as it converts high-frequency power into DC power. The DC power output from the rectifying / smoothing circuit 31 c is output to the combining unit 33.

  The first power reception unit 31 receives high-frequency power transmitted from the power transmission device 2 by magnetically coupling the magnetic field antenna 31a with the power transmission coil Lt (parallel two lines including the line 22a and the line 22b). That is, the magnetic flux changes due to the high-frequency current flowing through the power transmission coil Lt, and the high-frequency current flows through the magnetic field antenna 31a linked to the magnetic flux. Thereby, electric power can be supplied from the power transmission device 2 to the first power receiving unit 31 in a non-contact manner.

  The track 22a and the track 22b are laid on the surface of the road, and the magnetic field antenna 31a is disposed on the bottom surface of the electric vehicle V. Therefore, the distance between the coil surface of the power transmission coil Lt constituted by the line 22a and the line 22b and the coil surface of the magnetic field antenna 31a functioning as the power receiving coil does not change even during the traveling of the electric vehicle V, and the coupling coefficient of both coils Is constant.

  The second power receiving unit 32 includes electric field antennas 32a and 32b, a resonance coil 32c, and a rectifying / smoothing circuit 32d.

  The electric field antennas 32a and 32b are rectangular copper plates having the same width as the lines 22a and 22b. The electric field antennas 32a and 32b are arranged on the bottom surface of the vehicle body of the electric vehicle V so as to be substantially parallel to each other and to be substantially parallel to the road. Has been. The electric field antennas 32a and 32b function as power receiving electrode plates that are coupled to the power transmitting electrode plates 22a and 22b (lines 22a and 22b) and receive power in a non-contact manner. In FIG. 1 (a), the width dimensions of the electric field antennas 32a and 32b are shown larger than actual so that the overlapping state of the magnetic field antenna 31a, the electric field antennas 32a and 32b, and the lines 22a and 22b can be easily understood. Yes. While the electric vehicle V is traveling, the electric field antennas 32a and 32b overlap the lines 22a and 22b in plan view, respectively. The shape, size and material of the electric field antennas 32a and 32b are not limited to this. The electric field antenna 32a (32b) preferably has a shape, size, and arrangement that can increase the capacitance of the capacitor formed between the line 22a (22b) and the electric field antenna 32a (32b). Therefore, it is desirable that the electric field antennas 32a and 32b have a larger dimension in the traveling direction of the electric vehicle V. The width dimensions of the electric field antennas 32a and 32b may be increased so that the capacitance does not change even if the position of the electric vehicle V in the width direction changes. In the present embodiment, in order to shorten the distance between the electric field antenna 32a (32b) and the line 22a (22b) and increase the capacitance, the electric field antennas 32a and 32b are placed closer to the road than the magnetic field antenna 31a. (See FIG. 1).

  The resonance coil 32c is connected in series between the electric field antenna 32a and the rectifying / smoothing circuit 32d to form a series resonance circuit. The resonance coil 32c may be connected in series between the electric field antenna 32b and the rectifying / smoothing circuit 32d.

Similarly to the magnetic field antenna 31a and the resonance capacitor 31b, the electric field antennas 32a and 32b and the resonance coil 32c have a resonance frequency that matches the frequency f ₀ (switching frequency f ₀ ) of the high-frequency power supplied from the high-frequency power supply device 21. Designed.

  The rectifying / smoothing circuit 32d converts high-frequency power received by the electric field antennas 32a and 32b into DC power. The rectifying / smoothing circuit 32d has the same configuration as the rectifying / smoothing circuit 31c. The configuration of the rectifying / smoothing circuit 32d is not limited as long as it converts high-frequency power into DC power. The DC power output from the rectifying / smoothing circuit 32d is output to the combining unit 33.

  The second power receiving unit 32 receives high-frequency power transmitted from the power transmission device 2 by the electric field coupling between the electric field antennas 32a and 32b and the power transmission electrode plates 22a and 22b (lines 22a and 22b). That is, a potential difference between the power transmission electrode plates 22a and 22b (lines 22a and 22b) is generated between the electric field antennas 32a and 32b, and a high-frequency current flows between the electric field antenna 32a and the electric field antenna 32b. Thereby, electric power can be supplied from the power transmission device 2 to the second power receiving unit 32 in a non-contact manner.

  In addition, since the electric field antennas 32a and 32b are also arranged on the bottom surface of the electric vehicle V, the distance between the line 22a and the electric field antenna 32a and the distance between the line 22b and the electric field antenna 32b are also during the traveling of the electric vehicle V. It does not change. Therefore, the capacitance of the capacitor formed by the line 22a and the electric field antenna 32a and the capacitance of the capacitor formed by the line 22b and the electric field antenna 32b are constant.

  The combining unit 33 connects the first power receiving unit 31 and the second power receiving unit 32 in parallel with each other. The combining unit 33 outputs the higher voltage of the output voltage of the first power receiving unit 31 and the output voltage of the second power receiving unit 32 to the load 4, so that the power received by the first power receiving unit 31 and the second power receiving The power received by the unit 32 is combined and output to the load 4.

  According to this embodiment, the high frequency power transmitted from the parallel two lines (lines 22a and 22b) is received by the magnetic field antenna 31a and the electric field antennas 32a and 32b. The first power receiving unit 31 converts the high frequency power received by the magnetic field antenna 31 a into DC power and outputs it to the combining unit 33. Further, the second power receiving unit 32 converts the high frequency power received by the electric field antennas 32 a and 32 b into direct current power and outputs the direct current power to the combining unit 33. The combining unit 33 combines the power input from the first power receiving unit 31 and the power input from the second power receiving unit 32 and outputs the combined power to the load 4. Since the current standing wave and the voltage standing wave on the two parallel lines are out of phase by 90 °, the power received by the magnetic field antenna 31a and the power received by the electric field antennas 32a and 32b complement each other. be able to. For example, when the power receiving position is in the vicinity of the valley of the current standing wave, the power received by the magnetic field antenna 31a is small, but the power received by the electric field antennas 32a and 32b is large because it is located at the peak of the voltage standing wave. Become. Conversely, when the power receiving position is near the position of the voltage standing wave valley, the electric power received by the electric field antennas 32a and 32b is small, but the electric power received by the magnetic field antenna 31a is the position of the current standing wave peak. Becomes bigger. Thereby, it can suppress that received electric power changes greatly by the receiving position on a parallel 2 line.

  In FIG. 1, a wiring is connected to the right side of the magnetic field antenna 31a, a resonance capacitor 31b is connected, a wiring is connected to the right side of the electric field antennas 32a, 32b, and a resonance coil 32c is connected. Although an example is described, it is not limited to this. For example, the direction of the magnetic field antenna 31a may be reversed from that in FIG. Further, the arrangement location of the resonance capacitor 31b, the resonance coil 32c, and the like is not limited.

  In the first embodiment, the case where the magnetic field antenna 31a and the electric field antennas 32a and 32b overlap in plan view has been described. However, the arrangement of the magnetic field antenna 31a and the electric field antennas 32a and 32b is not limited thereto. .

  FIG. 3 is a diagram for explaining a modified example of the power receiving device 3. The figure (a) has shown the state which looked at the electric vehicle V in which the power transmission apparatus 3 was mounted from the top, and the figure (b) has shown the state which looked at the side surface of the electric vehicle V. In the same figure, the same code | symbol is attached | subjected to the same or similar element as the power receiving apparatus 3 (refer FIG. 1) which concerns on 1st Embodiment. The power receiving device 3 according to the modification is different from the power receiving device 3 according to the first embodiment in that the magnetic field antenna 31a is disposed between the electric field antenna 32a and the electric field antenna 32b. In the modified example, the coil surface of the magnetic field antenna 31a can be brought closer to the coil surface of the power transmission coil Lt configured by the line 22a and the line 22b, so that the coupling coefficient of both coils can be further increased. Moreover, the height dimension of the area | region which arrange | positions the magnetic field antenna 31a and the electric field antennas 32a and 32b can be made small (refer FIG.3 (b)). However, since the area linked to the magnetic flux generated from the coil surface of the power transmission coil Lt is reduced, the power that can be received by the magnetic field antenna 31a is reduced.

  FIG. 4 is a diagram for explaining another modification of the power receiving device 3. The figure (a) has shown the state (The description except magnetic field antenna 31a and electric field antenna 32a, 32b is abbreviate | omitted) which looked at the electric vehicle V carrying the power transmission apparatus 3 from the top. b) shows a state in which the side surface of the electric vehicle V is viewed. In the same figure, the same code | symbol is attached | subjected to the same or similar element as the power receiving apparatus 3 (refer FIG. 1) which concerns on 1st Embodiment. The power receiving device 3 according to the modification is different from the power receiving device 3 according to the first embodiment in that the magnetic field antenna 31a and the electric field antennas 32a and 32b are arranged side by side in a plan view. Also in the modified example, the coil surface of the magnetic field antenna 31a can be brought closer to the coil surface of the power transmission coil Lt constituted by the line 22a and the line 22b, so that the coupling coefficient of both coils can be further increased. Moreover, the height dimension of the area | region which arrange | positions the magnetic field antenna 31a and the electric field antennas 32a and 32b can be made small (refer FIG.3 (b)). Further, unlike the modification of FIG. 3, the area linked to the magnetic flux generated from the coil surface of the power transmission coil Lt does not change. However, since the magnetic antenna 31a and the electric field antennas 32a and 32b have different arrangement positions in the extending direction of the two parallel lines (lines 22a and 22b), the electric power received by the magnetic field antenna 31a and the electric field antennas 32a and 32b receive power. Deviation occurs in the complementary relationship with power. Therefore, the change in the received power due to the power receiving position on the parallel two lines becomes larger than that in the case where the arrangement positions in the extending direction of the parallel two lines are matched between the magnetic field antenna 31a and the electric field antennas 32a and 32b. In addition, when the length of the displacement of the arrangement position is sufficiently smaller than the wavelength of the high-frequency power used (for example, 10 to 100 [m]), the influence of the displacement is small.

  In FIG. 4, an example in which wiring is connected to the left side of the magnetic field antenna 31 a and wiring is connected to the right side of the electric field antennas 32 a and 32 b is described, but the present invention is not limited to this. For example, the direction of the magnetic field antenna 31a may be reversed from that in FIG. Further, wiring may be connected to the left side of the electric field antennas 32a and 32b. Further, the arrangement location of the magnetic field antenna 31a and the electric field antennas 32a and 32b may be opposite to that in FIG.

  Moreover, in the said 1st Embodiment, although the case where both the 1st power receiving unit 31 and the 1st power receiving unit 32 were series resonance circuits was demonstrated, it is not restricted to this.

  FIG. 5 is a diagram for explaining the non-contact power transmission system 1B according to the second embodiment. The figure (a) is a circuit diagram which shows the whole structure of the non-contact electric power transmission system 1B. FIG. 2B is a schematic diagram showing the overall configuration of the non-contact power transmission system 1B. In FIG. 5, the same or similar elements as those in the contactless power transmission system 1A according to the first embodiment (see FIGS. 1A and 2) are denoted by the same reference numerals. The non-contact power transmission system 1B is different from the non-contact power transmission system 1A according to the first embodiment in that both the first power receiving unit 31 'and the first power receiving unit 32' are parallel resonant circuits.

In the first power receiving unit 31 ′, a resonant capacitor 31b is connected in parallel to the magnetic field antenna 31a, thereby forming a parallel resonant circuit. The magnetic field antenna 31a and the resonance capacitor 31b are designed so that the resonance frequency matches the frequency f ₀ (switching frequency f ₀ ) of the high frequency power supplied from the high frequency power supply device 21.

In the second power receiving unit 32 ′, a resonance coil 32c is connected in parallel between the electric field antennas 32a and 32b and the rectifying / smoothing circuit 32d, thereby forming a parallel resonance circuit. The electric field antennas 32 a and 32 b and the resonance coil 32 c are designed so that the resonance frequency matches the frequency f ₀ (switching frequency f ₀ ) of the high frequency power supplied from the high frequency power supply device 21.

  In the second embodiment, the same effect as that of the first embodiment can be obtained. Note that, as in the combination of the first power receiving unit 31 and the second power receiving unit 32 ′, or the combination of the first power receiving unit 31 ′ and the second power receiving unit 32, one is a series resonance circuit and the other is in parallel resonance. It may be a circuit.

  In the said 1st and 2nd embodiment, although the synthetic | combination part 33 demonstrated the case where the 1st power receiving unit 31 and the 2nd power receiving unit 32 were mutually connected in parallel, it is not restricted to this. A case where the combining unit 33 connects the first power receiving unit 31 and the second power receiving unit 32 in series will be described below as a third embodiment.

  FIG. 6 is a diagram for explaining a non-contact power transmission system 1C according to the third embodiment, and is a circuit diagram showing an overall configuration. In FIG. 6, the same or similar elements as those in the contactless power transmission system 1A (see FIG. 2) according to the first embodiment are denoted by the same reference numerals. The non-contact power transmission system 1C is different from the non-contact power transmission system 1A according to the first embodiment in that the combining unit 33 'connects the first power receiving unit 31 and the second power receiving unit 32 in series.

  The combining unit 33 ′ connects the first power receiving unit 31 and the second power receiving unit 32 in series with each other. The combining unit 33 ′ outputs a voltage obtained by combining the output voltage of the first power receiving unit 31 and the output voltage of the second power receiving unit 32 to the load 4, so that the power received by the first power receiving unit 31 and the second power receiving unit are output. The power received by 32 is combined and output to the load 4.

  According to the third embodiment, the synthesizer 33 ′ connects the first power receiving unit 31 and the second power receiving unit 32 in series to each other so that the power input from the first power receiving unit 31 and the second power receiving unit 32 are input. The generated power is combined and output to the load 4. Therefore, also in the third embodiment, the power received by the magnetic field antenna 31a and the power received by the electric field antennas 32a and 32b can complement each other, so that the received power depends on the power receiving position on the parallel two lines. It can suppress that it changes greatly.

  In the third embodiment, each of the first power receiving unit 31 and the second power receiving unit 32 is a series resonant circuit. However, the present invention is not limited to this, and both may be a parallel resonant circuit (see FIG. 5). One may be a series resonant circuit and the other may be a parallel resonant circuit.

  In the said 1st-3rd embodiment, although the case where the parallel two track | line was arrange | positioned so that it might become parallel to the surface of a road was demonstrated, it is not restricted to this. For example, as shown in FIG. 7, the parallel two tracks may be arranged so as to be substantially orthogonal to the surface of the road. In this case, as shown in FIG. 7, the magnetic field antenna 31a and the electric field antennas 32a and 32b may be arranged on the side surface of the electric vehicle V so that the coil surface or the plate surface is substantially orthogonal to the road.

  Moreover, although the said 1st-3rd embodiment demonstrated the case where two parallel lines (line 22a and line 22b) were strip | belt-shaped conductors, it is not restricted to this. For example, as shown in FIG. 8, the line 22a and the line 22b may be linear conductors. In this case, in order to increase the capacitance of the capacitor formed between the electric field antenna 32a (32b) and the line 22a (22b), as shown in the schematic perspective view of FIG. The antenna 32a (32b) may have a cylindrical shape, and the line 22a (22b) may be disposed so as to penetrate the inside.

  Moreover, in the said 1st-3rd embodiment, although the case where the power receiving apparatus 3 was mounted in the electric vehicle V was demonstrated, it is not restricted to this. For example, you may make it mount in the mobile body using electric power, such as the automatic guided vehicle (AGV: Automated Guided Vehicle) which drive | works automatically along the preset circulation path | route, and the vehicle which drive | works on a rail.

  The non-contact power transmission system and the power receiving device according to the present invention are not limited to the above-described embodiments. The specific configuration of each part of the non-contact power transmission system and the power receiving device according to the present invention can be varied in design in various ways.

1A, 1B, 1C Non-contact power transmission system 2 Power transmission device 21 High frequency power supply device 21a DC power supply device 21b Inverter circuit 21c Impedance matching device 22 Power transmission unit 22a, 22b Line (parallel two lines)
3 Power receiving device 31, 31 ′ First power receiving unit 31a Magnetic field antenna 31b Resonant capacitor 31c Rectification smoothing circuit (first rectification circuit)
32, 32 '2nd power receiving unit 32a, 32b Electric field antenna 32c Resonance coil 32d Rectification smoothing circuit (2nd rectification circuit)
33,33 'composition part 4 load V electric vehicle

Claims (14)

A non-contact power transmission system for transmitting power from a power transmission device to a power reception device in a non-contact manner,
The power transmission device is:
A power transmission unit having two parallel lines in which two conductor lines are installed in parallel;
A high frequency power supply for supplying high frequency power to the power transmission unit;
With
The power receiving device is:
A first power receiving unit comprising: a magnetic field antenna that is magnetically coupled to the two parallel lines; a resonant capacitor connected to the magnetic field antenna; and a first rectifier circuit that converts high-frequency power received by the magnetic field antenna into DC power. Unit,
A second power receiving unit comprising: an electric field antenna that is electrically coupled to the two parallel lines; a resonance coil connected to the electric field antenna; and a second rectifier circuit that converts high-frequency power received by the electric field antenna into DC power. Unit,
A combining unit that combines the DC power output from the first power receiving unit and the DC power output from the second power receiving unit, and supplies the combined power to the load;
With
A non-contact power transmission system characterized by that. Each of the lines is strip-shaped,
The magnetic field antenna includes a coil,
The electric field antenna includes two conductor plates.
The contactless power transmission system according to claim 1. The electric field antenna and the magnetic field antenna are arranged at substantially the same position in the direction in which the parallel two lines extend.
The contactless power transmission system according to claim 2. The electric field antenna is disposed closer to the parallel two lines than the magnetic field antenna.
The contactless power transmission system according to claim 2 or 3. The magnetic field antenna is disposed between two conductor plates of the electric field antenna.
The contactless power transmission system according to claim 2. The resonant capacitor is connected in series to the magnetic field antenna,
The contactless power transmission system according to claim 2. The resonant capacitor is connected in parallel to the magnetic field antenna,
The contactless power transmission system according to claim 2. The resonant coil is connected in series between one conductor plate of the electric field antenna and the second rectifier circuit,
The contactless power transmission system according to claim 2. The resonant coil is connected in parallel between the electric field antenna and the second rectifier circuit.
The contactless power transmission system according to claim 2. The combining unit is configured to connect the first power receiving unit and the second power receiving unit in parallel.
The non-contact power transmission system according to claim 2. The combining unit is configured to connect the first power receiving unit and the second power receiving unit in series.
The non-contact power transmission system according to claim 2. The high frequency power supply device includes an impedance matching device,
The contactless power transmission system according to claim 2. The parallel two tracks are laid on the road or buried in the road,
The power receiving device is mounted on a car,
The magnetic field antenna and the electric field antenna are disposed on a bottom surface of the vehicle body,
The contactless power transmission system according to claim 1. A power receiving device that receives electric power transmitted in a non-contact manner from two parallel lines in which two conductor lines are installed in parallel,
A first power receiving unit comprising: a magnetic field antenna that is magnetically coupled to the two parallel lines; a resonant capacitor connected to the magnetic field antenna; and a first rectifier circuit that converts high-frequency power received by the magnetic field antenna into DC power. Unit,
A second power receiving unit comprising: an electric field antenna that is electrically coupled to the two parallel lines; a resonance coil connected to the electric field antenna; and a second rectifier circuit that converts high-frequency power received by the electric field antenna into DC power. Unit,
A combining unit that combines the DC power output from the first power receiving unit and the DC power output from the second power receiving unit, and supplies the combined power to the load;
With
A power receiving device.

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