JP2016220312A - Power reception device and power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power reception device and a power transmission device that include a coil unit containing a coil and capacitors provided at both the ends of the coil unit and in which the distance between a connection wire connected to different capacitors and an external wire can be sufficiently secured.SOLUTION: A power reception device includes a power reception capacitor 67, a power reception coil unit 61, a power reception capacitor 69, wires 55 and 56, a connection wire 70 for connecting the power reception capacitor 67 and one end of the power reception coil unit 61, and a power reception capacitor 69 for connecting the other end of the power reception coil unit 61 and the power reception capacitor 69. The distance between the wire 56 and the connection wire 70 at a portion where the wire 56 and the connection wire 70 are closest to each other is not less than the distance between an electrode 79 and an electrode 80, and the distance between the wire 55 and the connection wire 73 at a portion where the wire 55 and the connection wire 73 are closest to each other is not less than the distance between a third electrode and a fourth electrode.SELECTED DRAWING: Figure 20

Description

  The present invention relates to a power reception device and a power transmission device.

  Conventionally, various systems have been proposed for non-contact power transmission between a power receiving apparatus and a power transmitting apparatus. The power receiving device includes a resonant circuit, and the resonant circuit includes a power receiving coil and a power receiving capacitor. Similarly, the power transmission device includes a resonance circuit, and the resonance circuit includes a power transmission coil and a power transmission capacitor.

JP2013-154815A JP2013-146154A JP2013-146148A JP 2013-110822 A JP 2013-126327 A JP 2013-80785 A

  In general, the resonance frequency of the resonance circuit of the power transmission apparatus is matched with the resonance frequency of the resonance circuit of the power reception apparatus. A power transmission current having the same frequency as the resonance frequency of the resonance circuit is supplied from the power source to the power transmission device, and a magnetic field is formed around the power transmission device. A resonance circuit of the power receiving device receives power from the magnetic field. Since the frequency of the power reception current matches the frequency of the magnetic field, as a result, a power reception current having the same frequency as the resonance frequency of the resonance circuit flows through the resonance circuit of the power reception device.

  Generally, a series LC resonance circuit in which one capacitor is connected in series to one coil is adopted as a resonance circuit provided in the power receiving device and the power transmission device.

  When the inventors adopt a series LC resonance circuit in which one capacitor and one coil are connected in series, the voltage at the connection portion between the capacitor and the coil increases during power transmission, while the series LC resonance circuit It has been found that both ends of V are 0V or substantially 0V. As a result, it has been found that the average voltage increases in the series LC resonance circuit.

  Therefore, the inventors provided a coil, a first capacitor connected to one end of the coil, and a second capacitor connected to the other end of the coil for the purpose of reducing the average voltage of the resonance circuit. The resonant circuit was examined. A first external wiring connected to an external device is connected to one electrode of the first capacitor, and a first connection wiring connected to one end of the coil is connected to the other electrode of the first capacitor. ing. A second external wiring is connected to one electrode of the second capacitor, and a second connection wiring connected to the other end of the coil is connected to the other electrode.

  By adopting the resonance circuit, the inventors can drop the voltage with the first capacitor and the second capacitor at the timing when the voltage rises with the coil, and the first capacitor and the voltage with the timing when the voltage drops with the coil. It has been found that the voltage can be increased by the second capacitor, and the average voltage of the resonance circuit can be lowered.

  In general, the wirings connected to the electrodes of one capacitor are separated from each other. In the above resonance circuit, the distance between the first external wiring and the first connection wiring, the second external wiring, and the second external wiring. It is generally considered to secure the distance between the connection wirings.

  However, in order to reduce the size of the device, it has not been studied to secure the distance between the wires connected to different capacitors when the capacitors are arranged in the coil.

  As a result, it has been found that the distance between the first external wiring and the second connection wiring and the distance between the second external wiring and the first connection wiring are short.

  The present invention has been made in view of the above-described problems, and the object thereof is different in a power receiving device and a power transmitting device including a coil unit including a coil and capacitors provided at both ends of the coil unit. It is an object of the present invention to provide a power receiving device and a power transmitting device in which a distance between a connection wiring connected to a capacitor and an external wiring is sufficiently secured.

  The power receiving device includes a power receiving coil unit including a power receiving coil formed by winding a coil wire so as to surround the periphery of the winding shaft, and is connected to one end of the power receiving coil unit, and the power receiving coil unit is disposed below the power receiving coil unit. When viewed, the first receiving capacitor disposed in the receiving coil and the other end of the receiving coil unit are connected, and when viewed from the lower side of the receiving coil unit, the receiving coil unit is disposed in the receiving coil. Connecting the second power receiving capacitor, the first external wiring connecting the first power receiving capacitor and the external device, the second external wiring connecting the second power receiving capacitor and the external device, and connecting the first power receiving capacitor and the coil unit First connection wiring, and second connection wiring for connecting the second power receiving capacitor and the coil unit.

  The first capacitor includes a first electrode to which a first external wiring is connected, and a second electrode that is disposed closer to the winding shaft than the first electrode and to which the first connection wiring is connected. The second capacitor includes a third electrode to which a second external wiring is connected, and a fourth electrode that is disposed closer to the winding shaft than the third electrode and to which the second connection wiring is connected.

  The distance between the first external wiring and the second connection wiring in the portion where the first external wiring and the second connection wiring are closest to each other is not less than the distance between the first electrode and the second electrode of the first capacitor. is there. The distance between the second external wiring and the first connection wiring in the portion where the second external wiring and the first connection wiring are closest to each other is not less than the distance between the third electrode and the fourth electrode of the second capacitor. is there.

  According to the power reception device, the resonance circuit is formed by the power reception coil unit, the first power reception capacitor, and the second power reception capacitor. When the power receiving device receives power, the voltage of the first external wiring and the second external wiring during power reception is in a state of 0V or close to 0V. On the other hand, the voltage of the first connection wiring and the second electrode vibrates with a predetermined voltage amplitude, and the second connection wiring and the fourth electrode similarly vibrate with the predetermined voltage amplitude.

  The distance between the first external wiring and the first connection wiring is the distance between the first electrode and the second electrode provided in the same first capacitor, and is between the first external wiring and the first connection wiring. The distance is secured.

  The distance between the second external wiring and the second connection wiring is the distance between the third electrode and the fourth electrode provided in the same second capacitor, and is between the second external wiring and the second connection wiring. The distance is secured.

  Further, the distance between the first external wiring and the second connection wiring is not less than the distance between the first electrode and the second electrode, and the distance between the first external wiring and the second connection wiring is ensured. Yes.

  Similarly, the distance between the second external wiring and the first connection wiring is equal to or greater than the distance between the third electrode and the fourth electrode, and the distance between the second external wiring and the first connection wiring is ensured. ing.

  Therefore, in the above power receiving device, the distance between each external wiring and each connection wiring is secured.

  Preferably, the first capacitor and the second capacitor are provided so as to be adjacent to each other and are arranged in the direction in which the coil wire extends. The first external wiring is drawn from the first electrode in a direction from the second electrode side to the first electrode side. The second external wiring is drawn from the third electrode in a direction from the fourth electrode side to the third electrode side. The first connection wiring is led out from the second electrode in a direction from the second capacitor side toward the first capacitor side. The second connection wiring is led out from the third electrode in a direction from the first capacitor side to the second capacitor side.

  In the above power receiving device, the first external wiring, the first connection wiring, and the second connection wiring are prevented from crossing, and the distance between the wirings can be ensured. In addition, the second external wiring, the first connection wiring, and the second connection wiring are suppressed from intersecting, and the distance between the wirings can be ensured.

  Preferably, the power receiving coil unit includes a first power receiving coil having a first connection wiring connected to one end, and a second power receiving coil having a second connection wiring connected to one end. The first power receiving coil and the second power receiving coil are arranged to overlap each other. When the power receiving coil unit is viewed from below the power receiving coil unit, the power receiving device is disposed in the power receiving coil unit, and includes a third power receiving capacitor including a fifth electrode and a sixth electrode, a fifth electrode, and a first power receiving. A third connection wiring for connecting the other end of the coil and a fourth connection wiring for connecting the sixth electrode and the other end of the second power receiving coil are further provided.

  The distance between the first connection wiring and the third connection wiring in the portion where the first connection wiring and the third connection wiring are closest is longer than the distance between the first connection wiring and the second external wiring. . The distance between the fourth connection line and the second connection line in the portion where the fourth connection line and the second connection line are closest is longer than the distance between the first external line and the second connection line. .

  According to the above power receiving device, the first external wiring, the first capacitor, the first connection wiring, the first power receiving coil, the third connection wiring, the third capacitor, the fourth connection wiring, and the second The power receiving coil, the second connection wiring, the second capacitor, and the second external wiring are sequentially connected. When power is received with this configuration, the voltage difference between the first connection wiring and the third connection wiring increases, and the voltage difference between the second connection wiring and the fourth connection wiring also increases.

  On the other hand, the distance between the first connection wiring and the third connection wiring is secured, and the distance between the second connection wiring and the fourth connection wiring is also secured.

  Preferably, the coil wire of the first power receiving coil is wound around the first winding from one end of the first power receiving coil to which the first connection wiring is connected toward the other end of the first power receiving coil to which the third connection wiring is connected. Wound in the direction. The coil wire of the second power receiving coil moves in the first winding direction from the other end of the second power receiving coil to which the fourth connection wiring is connected toward one end of the second power receiving coil to which the second connection wiring is connected. It is wound.

  According to the above power receiving device, the directions of the currents flowing through the first power receiving coil and the second power receiving coil are the same direction, and an electromagnetic field with high strength can be formed.

  According to the power reception device and the power transmission device according to the present invention, it is possible to suppress the proximity of wirings having a large voltage difference.

It is a mimetic diagram showing typically electric power transmission system 1 concerning this embodiment. 1 is a circuit diagram schematically showing a power transmission system 1. FIG. 2 is an exploded perspective view showing a power transmission device 5. FIG. 3 is a plan view of the power transmission unit 15 when viewed from above the power transmission unit 15. FIG. FIG. 3 is a plan view schematically showing the power transmission capacitor 35 and is a plan view when the power transmission capacitor 35 is viewed from above the power transmission unit 15. 2 is a circuit diagram schematically showing a power transmission unit 15. FIG. It is sectional drawing in the VII-VII line shown in FIG. It is sectional drawing in the VIII-VIII line shown in FIG. It is a top view which shows the power transmission part 15 which abbreviate | omitted the center ferrite 32, the power transmission coil 34, etc. FIG. It is a top view which shows the power transmission part 15 which abbreviate | omitted center ferrite 32 grade | etc.,. It is a top view which shows typically the power transmission part 15 which abbreviate | omitted center ferrite 32 grade | etc.,. 2 is an exploded perspective view showing a power receiving device 6. FIG. FIG. 3 is a plan view of the power receiving unit 10 when the power receiving unit 10 is viewed from below. 3 is a plan view schematically showing a power receiving capacitor 67. FIG. 2 is a circuit diagram schematically showing a power reception unit 10. FIG. It is sectional drawing in the XVI-XVI line shown in FIG. It is sectional drawing in the XVII-XVII line shown in FIG. 4 is a plan view in which a central ferrite 64 and a power receiving coil 66 are omitted. FIG. It is the top view which omitted the center ferrite 64 grade | etc.,. It is a top view which shows typically the power receiving part 10 which abbreviate | omitted center ferrite 64 grade | etc.,. It is a graph which shows the voltage distribution in the power transmission part 15 at the time of electric power transmission. It is a graph which shows the voltage distribution in the power receiving part 10 when the power receiving apparatus 6 is receiving electric power. 6 is a plan view schematically showing a modification of the power transmission unit 15. FIG. It is a circuit diagram which shows 15 A of power transmission parts. It is a graph which shows the voltage distribution in 15 A of power transmission parts during power transmission. It is a top view which shows typically the modification of the power receiving part 10, and the center ferrite is abbreviate | omitted. It is a circuit diagram showing power receiving unit 10A. It is a graph which shows voltage distribution in 10 A of electric power reception parts during electric power reception.

  FIG. 1 is a schematic diagram schematically showing a power transmission system 1 according to the present embodiment. The power transmission system 1 includes a vehicle 3 including a power receiving module 2 and a power transmission device 5 connected to a power source 4.

  The power receiving module 2 includes a power receiving device 6, a rectifier 7 connected to the power receiving device 6, and a battery 8 connected to the rectifier 7.

  The power receiving device 6 includes a power receiving unit 10 and a housing 11 that houses the power receiving unit 10. The rectifier 7 converts AC power received by the power receiving device 6 into DC power and supplies the DC power to the battery 8. The electric power stored in the battery 8 is supplied to, for example, a converter (not shown), and the electric power supplied to the converter is supplied to the inverter. Then, it is converted into a three-phase alternating current by an inverter and supplied to the rotating electrical machine, and the rotating electrical machine drives the wheels.

  The power transmission device 5 includes a power transmission unit 15, a frequency converter 16 connected to the power transmission unit 15, and a housing 17 that houses the power transmission unit 15 and the frequency converter 16.

  FIG. 2 is a circuit diagram schematically showing the power transmission system 1. In FIG. 2, the power transmission unit 15 includes a resonance circuit, and the resonance circuit includes a plurality of power transmission coils and a plurality of power transmission capacitors. The power receiving unit 10 also includes a resonance circuit, and this resonance circuit also includes a plurality of power receiving coils and a plurality of power receiving capacitors. The specific configurations of the power reception unit 10 and the power transmission unit 15 will be described later.

  The resonance frequency of the resonance circuit of the power receiving unit 10 and the resonance frequency of the resonance circuit of the power transmission unit 15 are formed so as to match or substantially match.

  The Q value of the resonance circuit of the power receiving unit 10 is 100 or more, and the Q value of the resonance circuit of the power transmission unit 15 is also 100 or more. Thus, by setting the resonance frequency and the Q value of each resonance circuit, power can be transmitted from the power transmission device 5 to the power reception device 6 in a non-contact manner with high efficiency.

  FIG. 3 is an exploded perspective view showing the power transmission device 5. As illustrated in FIG. 5, the power transmission device 5 includes a power transmission unit 15, a frequency converter 16, wirings 28 and 29 that connect the power transmission unit 15 and the frequency converter 16, the frequency converter 16, and the power source 4. The wiring 30 to be connected and the housing 17 are included.

  The housing 17 includes a base plate 20 disposed on the ground, a lid 21 disposed so as to cover the base plate 20 from above the base plate 20, and a partition plate 22 formed on the upper surface of the base plate 20. Including. The lid 21 includes a resin lid 23 and a metal lid 24, and a space for accommodating the power transmission unit 15 is formed by attaching the resin lid 23 to the base plate 20. A space in which the frequency converter 16 is accommodated is formed by mounting the metal lid 24 on the base plate 20.

  The resin lid 23 is formed of a material that transmits an electromagnetic field formed around the power transmission unit 15. The metal lid 24 protects the frequency converter 16 from the outside and suppresses noise emitted from the frequency converter 16 from being radiated to the surroundings. The metal lid 24 is formed with a through hole 24a from which the wiring 30 is drawn.

  The partition plate 22 partitions a space that houses the frequency converter 16 and a space that houses the power transmission unit 15. The partition plate 22 has a through hole 22a into which the wiring 28 is inserted and a through hole 22b into which the wiring 29 is inserted.

  The power transmission unit 15 includes a ferrite 25, a power transmission coil unit 26 disposed on the upper surface of the ferrite 25, and a power transmission capacitor unit 27 disposed on the lower surface of the ferrite 25.

  The ferrite 25 includes an annular ferrite 31 formed by arranging a plurality of divided ferrites in an annular shape, and a central ferrite 32 that contacts the opening edge of the annular ferrite 31 and is disposed on the upper surface of the annular ferrite 31. . The central ferrite 32 includes a plurality of divided ferrites spaced from each other.

  The power transmission coil unit 26 includes a power transmission coil 33 disposed on the upper surface of the annular ferrite 31 and a power transmission coil 34 disposed on the upper surface of the power transmission coil 33.

  The power transmission coils 33 and 34 are formed by bending a coil wire so as to surround the periphery of the winding axis O <b> 1 extending in the vertical direction, and are disposed so as to surround the center ferrite 32.

  In the example shown in FIG. 3, the power transmission coils 33 and 34 are formed in a rectangular shape when viewed from above the power transmission coil unit 26, and the power transmission coils 33 and 34 have short sides and long sides. Part.

  The frequency converter (external device) 16 is arranged outside the power transmission coil unit 26, the wiring 28 connects the frequency converter 16 and the power transmission capacitor 35, and the wiring 29 is the frequency converter 16 and the power transmission capacitor. 37 is connected.

  The power transmission capacitor unit 27 includes power transmission capacitors 35, 36, and 37 disposed on the lower surface of the ferrite 25. The power transmission capacitors 35, 36, and 37 are arranged with a space therebetween. In addition, “D” shown in FIG. 3 indicates the downward direction in the vertical direction, and “U” indicates the upward direction in the vertical direction. “F” indicates the vehicle front direction, and “B” indicates the vehicle rear direction. “L” indicates the left direction of the vehicle, and “R” indicates the right direction of the vehicle.

  FIG. 4 is a plan view when the power transmission unit 15 is viewed from above the power transmission unit 15. As shown in FIG. 4, when viewed from above the power transmission coil unit 26, the power transmission capacitors 35, 36, and 37 are disposed in the power transmission coils 33 and 34 of the power transmission coil unit 26.

  The power transmission capacitor (first power transmission capacitor) 35 and the power transmission capacitor (second power transmission capacitor) 37 are disposed so as to be adjacent to each other, and are disposed so as to be adjacent in the direction in which the coil wires of the power transmission coils 33 and 34 extend. Yes. Specifically, a power transmission capacitor 35 and a power transmission capacitor 37 are arranged along the short sides of the power transmission coils 33 and 34. The power transmission capacitor (third power transmission capacitor) 36 is disposed on the opposite side of the power transmission capacitors 35 and 37 with respect to the winding axis O1.

  FIG. 5 is a plan view schematically showing the power transmission capacitor 35, and is a plan view when the power transmission capacitor 35 is viewed from above the power transmission unit 15. As shown in FIG. 5, the power transmission capacitor 35 includes a flat substrate 45, an electrode 49 and an electrode 50 formed on the upper surface of the substrate 45, and a parallel arrangement between the electrode 49 and the electrode 50. And a plurality of capacitor rows 46, 47, 48 connected to each other.

  The substrate 45 is formed in a rectangular shape when viewed in plan, and the peripheral portion of the substrate 45 includes two short sides arranged in the longitudinal direction and two long sides arranged in the short direction. The distance between the short sides is longer than the distance between the long sides. Each capacitor row 46, 47, 48 includes a plurality of capacitor elements 51 connected in series with each other, and the capacitor rows 46, 47, 48 are arranged to extend in the longitudinal direction of the substrate 45. The connection wiring 40 is connected to the electrode 50, the wiring 28 is connected to the electrode 49, and the electrode 49 and the electrode 50 are disposed in the vicinity of each short side portion.

  In FIG. 4, the electrode (seventh electrode) 49 of the power transmission capacitor 35 is disposed on the short side portion side of the power transmission coils 33 and 34, and the electrode (eighth electrode) 50 is disposed on the winding axis O <b> 1 side relative to the electrode 49. Has been. The power transmission capacitor 37 is formed in a rectangular shape when viewed from above. The power transmission capacitor 37 is composed of an electrode (9th electrode) 82 disposed on the short side portion of the power transmission coils 33 and 34, and an electrode 83. Also includes an electrode (tenth electrode) 83 disposed on the winding axis O1 side. The power transmission capacitor 37 also includes a plurality of capacitor rows connected in parallel between the electrode 82 and the electrode 83.

  The power transmission capacitor 36 includes an electrode (eleventh electrode) 84 disposed in the vicinity of one long side portion of the power transmission coils 33 and 34 and an electrode (in the vicinity of the other long side portion of the power transmission coils 33 and 34 ( 12th electrode) 85. The power transmission capacitor 36 also includes a plurality of capacitor arrays connected in parallel between the electrode 84 and the electrode 85.

  The power transmission unit 15 includes a connection wiring (fifth connection wiring) 40 that connects the electrode 50 of the power transmission capacitor (first power transmission capacitor) 35 and one end of the power transmission coil unit 26, the other end of the power transmission coil unit 26, and a power transmission capacitor (first). Connection wiring (sixth connection wiring) 43 that connects the electrodes 83 of the two power transmission capacitors) 37. Specifically, the connection wiring 40 connects the electrode 50 and one end of the power transmission coil 33, and the connection wiring 43 connects the electrode 83 and one end of the power transmission coil 34.

  Furthermore, the power transmission unit 15 includes a connection wiring (seventh connection wiring) 41 that connects the electrode 84 of the power transmission capacitor (third power transmission capacitor) 36 and the power transmission coil unit 26, and an electrode 85 of the power transmission capacitor 36 and the power transmission coil unit 26. Connection wiring (eighth connection wiring) 42. Specifically, the connection wiring 41 connects the other end of the power transmission coil 33 and the electrode 84, and the connection wiring 42 connects the electrode 85 and the other end of the power transmission coil 34.

  FIG. 6 is a circuit diagram schematically showing the power transmission unit 15. As shown in FIG. 6, the power transmission capacitor 35, the connection wiring 40, the power transmission coil 33, the connection wiring 41, the power transmission capacitor 36, the connection wiring 42, the power transmission coil 34, the connection wiring 43, and the power transmission capacitor. 37 is connected in series between the wiring 28 and the wiring 29.

  Next, the connection structure of the power transmission capacitor 35 and the like will be specifically described with reference to FIG.

  7 is a cross-sectional view taken along line VII-VII shown in FIG. With reference to FIG. 7 and FIG. 4, connection wiring 40 connects electrode 50 of power transmission capacitor 35 and the inner peripheral end of power transmission coil 33. The connection wiring 43 connects the outer peripheral end of the power transmission coil 34 and the electrode 83 of the power transmission capacitor 37.

  8 is a cross-sectional view taken along line VIII-VIII shown in FIG. As shown in FIG. 8, the connection wiring 41 connects the electrode 84 of the power transmission capacitor 36 and the outer peripheral end of the power transmission coil 33. The connection wiring 42 connects the inner peripheral end of the power transmission coil 34 and the electrode 85 of the power transmission capacitor 36.

  FIG. 9 is a plan view showing the power transmission unit 15 from which the central ferrite 32 and the power transmission coil 34 are omitted. As shown in FIG. 9, the wiring 28 is drawn into the power transmission coil 33 from the outer peripheral side of the power transmission coil 33, and the end of the wiring 28 is connected to the electrode 49 of the power transmission capacitor 35. In other words, the wiring 28 is led out from the electrode 49 in the direction from the electrode 50 side to the electrode 49 side.

  The connection wiring 40 is drawn from the electrode 50 to the winding axis O1 side, and then drawn in the direction from the power transmission capacitor 37 side toward the power transmission capacitor 35 side. The connection wiring 40 is connected to the inner peripheral end of the power transmission coil 33. Is done. The coil wire of the power transmission coil 33 is wound in the winding direction D1 from the inner peripheral end side toward the outer peripheral end. One end of the connection wiring 41 is connected to the outer peripheral end of the power transmission coil 33, and the connection wiring 41 is drawn into the annular ferrite 31 and connected to the electrode 84 of the power transmission capacitor 36.

  FIG. 10 is a plan view showing the power transmission unit 15 from which the central ferrite 32 and the like are omitted. As shown in FIG. 10, the connection wiring 42 is connected to the electrode 85 of the power transmission capacitor 36. The connection wiring 42 is connected to the inner peripheral end of the power transmission coil 34 through a gap between the split ferrites of the annular ferrite 31.

  The coil wire of the power transmission coil 34 is wound in the winding direction D1 from the inner peripheral end toward the outer peripheral end. One end of the connection wiring 43 is connected to the outer peripheral end of the power transmission coil 34, and the connection wiring 43 is drawn into the annular ferrite 31. The other end of the connection wiring 43 is connected to the electrode 83 of the power transmission capacitor 37.

  In other words, the connection wire 43 is drawn from the electrode 83 toward the winding axis O <b> 1, and then drawn in a direction from the power transmission capacitor 35 to the power transmission capacitor 37, and the end of the connection wire 43 is the end of the power transmission coil 34. Connected to the department. A wiring 29 is connected to the other electrode 82 of the power transmission capacitor 37. The wiring 29 is led out from the electrode 82 in the direction from the electrode 83 side to the electrode 82 side.

  As is clear from FIGS. 9 and 10, the wiring 28, the power transmission capacitor 35, the connection wiring 40, the inner peripheral end of the power transmission coil 33, the power transmission coil 33, the outer peripheral end of the power transmission coil 33, the connection wiring 41, the power transmission capacitor 36, the connection The wiring 42, the inner peripheral end of the power transmission coil 34, the power transmission coil 34, the outer peripheral end of the power transmission coil 34, the connection wiring 43, the power transmission capacitor 37, and the wiring 29 are sequentially connected.

  As a result, as shown in FIG. 6, each power transmission capacitor and each power transmission coil are sequentially connected.

  FIG. 11 is a plan view schematically showing the power transmission unit 15 from which the central ferrite 32 and the like are omitted. As shown in FIG. 11, the power transmission coil unit 26 is formed in a substantially rectangular shape when viewed from above.

  In FIG. 11, the distance between the electrode 49 and the electrode 50 is a distance L1, and the distance between the electrode 82 and the electrode 83 is a distance L2.

  The wiring (fourth external wiring) 29 and the connection wiring (fifth connection wiring) 40 are closest to each other between the connection portion between the wiring 29 and the electrode 82 and the connection portion between the connection wiring 40 and the electrode 50. . If the distance between the connection portion between the wiring 29 and the electrode 82 and the connection portion between the connection wiring 40 and the electrode 50 is a distance L3, the distance L3 is equal to or greater than the distance L2. The wiring (third external wiring) 28 and the connection wiring (sixth connection wiring) 43 are closest to each other between the connection portion between the wiring 28 and the electrode 49 and the connection portion between the connection wiring 43 and the electrode 83. To do.

  When the distance between the connection portion between the wiring 28 and the electrode 49 and the connection portion between the connection wiring 43 and the electrode 83 is a distance L4, the distance L4 is equal to or greater than the distance L1.

  Further, when the distance between the connection wiring 41 and the connection wiring 40 in the portion where the connection wiring 41 (seventh connection wiring) and the connection wiring 40 (fifth connection wiring) are closest is a distance L5, the distance L5 is a distance. Longer than L3. When the distance between the connection wiring 42 and the connection wiring 43 in the portion where the connection wiring 42 (eighth connection wiring) and the connection wiring 43 (sixth connection wiring) are closest is a distance L6, the distance L6 is a distance. Longer than L4.

  FIG. 12 is an exploded perspective view showing the power receiving device 6. As illustrated in FIG. 12, the power receiving device 6 includes a power receiving unit 10, a casing 11 that houses the power receiving unit 10, and wirings 55 and 56 that connect the power receiving unit 10 and the rectifier 7.

  The housing 11 includes a base plate 57 and a resin lid 58 provided so as to cover the base plate 57 from below the base plate 57. The base plate 57 may be formed of a metal material or a resin material. When the base plate 57 is formed of a resin material, a metal shield is disposed between the power receiving device 6 and the bottom surface of the vehicle.

  The resin lid 58 is made of a material that can transmit an electromagnetic field formed around the power receiving unit 10 during power reception, and is made of, for example, a resin material.

  On the peripheral surface of the resin lid 58, a through hole 58a and a through hole 58b from which the wiring 56 and the wiring 55 are drawn are formed.

  The power receiving unit 10 includes a ferrite 60, a power receiving coil unit 61 provided on the lower surface of the ferrite 60, and a power receiving capacitor unit 62 provided on the upper surface of the ferrite 60.

  The ferrite 60 includes an annular ferrite 63 in which a plurality of divided ferrites are annularly arranged at intervals, and a central ferrite 64 disposed on the lower surface of the annular ferrite 63 so as to contact the opening edge of the annular ferrite 63. . The central ferrite 64 includes a plurality of divided ferrites that are spaced apart from each other.

  The power receiving coil unit 61 includes a power receiving coil 65 disposed on the lower surface of the central ferrite 64 and a power receiving coil 66 disposed on the lower surface of the power receiving coil 65. Each of the power receiving coils 65 and 66 is formed by winding a coil wire so as to surround the winding axis O2. Each of the power receiving coils 65 and 66 is disposed so that the winding axis O <b> 2 faces in the vertical direction, and the power receiving coils 65 and 66 are disposed so as to surround the central ferrite 64. In the example shown in FIG. 12, the power receiving coils 65 and 66 are formed in a rectangular shape when viewed from below the power receiving coil unit 61, and the power receiving coils 65 and 66 have short sides. Part and long side part.

  The power receiving capacitor unit 62 includes a plurality of power receiving capacitors 67, 68, and 69 that are spaced apart from each other.

  The rectifier 7 is provided outside the power receiving coil unit 61, the wiring 55 connects the power receiving capacitor 67 and the rectifier 7, and the wiring 56 connects the power receiving capacitor 69 and the rectifier 7.

  FIG. 13 is a plan view of the power receiving unit 10 when the power receiving unit 10 is viewed from below. As shown in FIG. 13, when the power receiving coil unit 61 is viewed from below, the power receiving capacitors 67, 68, and 69 are disposed in the power receiving coils 65 and 66.

  The power receiving capacitor (first power receiving capacitor) 67 and the power receiving capacitor (second power receiving capacitor) 69 are arranged so as to be adjacent to each other and arranged along the short sides of the power receiving coils 65 and 66.

  The power receiving capacitor 68 is disposed on the opposite side of the power receiving capacitors 67 and 69 with respect to the winding axis O2.

  FIG. 14 is a plan view schematically showing the power receiving capacitor 67. As shown in FIG. 14, the power receiving capacitor 67 includes a flat substrate 75, an electrode 79 and an electrode 80 formed on the upper surface of the substrate 75, and a parallel arrangement between the electrode 79 and the electrode 80. And a plurality of capacitor rows 76, 77, 78 connected to each other.

  The substrate 75 is formed in a rectangular shape when viewed from above, and the outer peripheral edge of the substrate 75 includes two short sides arranged in the longitudinal direction and two long sides arranged in the short direction. In addition, the distance between the short sides is longer than the distance between the long sides. Each capacitor row 76, 77, 78 includes a plurality of capacitor elements 81 connected in series with each other.

  In FIG. 13, the electrode (first electrode) 79 of the power receiving capacitor 67 is disposed on the short side of the power receiving coils 65 and 66, and the electrode (second electrode) 80 is disposed on the winding axis O <b> 2 side of the electrode 79. ing. The power receiving capacitor 69 is formed in a rectangular shape when viewed from below, and the power receiving capacitor 69 includes an electrode (third electrode) 86 disposed on the short side of the power receiving coils 65 and 66, and the electrode 86. Also includes an electrode (fourth electrode) 87 disposed on the winding axis O2 side. The power receiving capacitor 69 also includes a plurality of capacitor rows connected in parallel between the electrode 86 and the electrode 87.

  Power receiving capacitor 68 includes an electrode 88 disposed on one long side of power receiving coils 65 and 66 and an electrode 89 disposed on the other long side. Power receiving capacitor 68 also includes a plurality of capacitor rows connected in parallel with each other between electrode 88 and electrode 89.

  The power receiving unit 10 includes a connection wiring 70 that connects the electrode 80 of the power receiving capacitor 67 and one end of the power receiving coil unit 61, and a connection wiring 73 that connects the electrode 87 of the power receiving capacitor 69 and the other end of the power receiving coil unit 61. Specifically, the connection wiring 70 connects the electrode 80 and one end of the power receiving coil 65, and the connection wiring 73 connects the one end of the power receiving coil 66 and the electrode 87.

  Furthermore, the power receiving unit 10 includes a connection wiring 71 that connects the power receiving coil unit 61 and the electrode 88 of the power receiving capacitor 68, and a connection wiring 72 that connects the power receiving coil unit 61 and the electrode 89. Specifically, the connection wiring 71 connects the end of the power reception coil 65 and the electrode 88, and the connection wiring 72 connects the power reception coil 66 and the electrode 89.

  FIG. 15 is a circuit diagram schematically showing the power receiving unit 10. As shown in FIG. 15, between the wiring 55 and the wiring 56, the power receiving capacitor 67, the connection wiring 70, the power receiving coil 65, the connection wiring 71, the power receiving capacitor 68, the connection wiring 72, and the power receiving coil are provided. 66, the connection wiring 73, and the power receiving capacitor 69 are sequentially connected in series.

  Next, the connection structure of the power receiving capacitor 67 and the like will be specifically described with reference to FIG.

  16 is a cross-sectional view taken along line XVI-XVI shown in FIG. As shown in FIG. 16, the connection wiring 70 connects the electrode 80 of the power receiving capacitor 67 and the inner peripheral end of the power receiving coil 65. The connection wiring 73 connects the electrode 87 of the power receiving capacitor 69 and the outer peripheral end of the power receiving coil 66.

  17 is a cross-sectional view taken along line XVII-XVII shown in FIG. As shown in FIG. 17, the connection wiring 71 connects the electrode 88 of the power receiving capacitor 68 and the outer peripheral end of the power receiving coil 65. The connection wiring 72 connects the electrode 89 of the power receiving capacitor 68 and the inner peripheral end of the power receiving coil 66.

  FIG. 18 is a plan view in which the central ferrite 64 and the power receiving coil 66 are omitted. As shown in FIG. 18, the wiring 55 is drawn into the power receiving coil 65 from the outer peripheral side of the power receiving coil 65, and the end of the wiring 55 is connected to the electrode 79 of the power receiving capacitor 67. In other words, the wiring 55 is drawn from the electrode 79 in the direction from the electrode 80 side toward the electrode 79 side.

  One end of the connection wiring 70 is connected to the electrode 80 of the power reception capacitor 67, and the other end of the connection wiring 70 is connected to the inner peripheral end of the power reception coil 65.

  Specifically, the connection wiring 70 is drawn out from the electrode 80 toward the winding axis O <b> 2, and then drawn out in a direction from the power reception capacitor 69 side toward the power reception capacitor 67, and the end of the connection wiring 70 is connected to the power reception coil 65. Connected to the inner periphery.

  The power receiving coil 65 is wound in a winding direction D2 indicated by an arrow in the drawing so as to surround the winding axis O2 from the inner peripheral end toward the outer peripheral end. The power receiving coil 65 is formed such that the winding diameter increases from the inner peripheral end toward the outer peripheral end.

  One end of the connection wiring 71 is connected to the outer peripheral end of the power reception coil 65, and the other end of the connection wiring 71 is connected to the electrode 88 of the power reception capacitor 68.

  FIG. 19 is a plan view in which the central ferrite 64 and the like are omitted. As shown in FIG. 19, one end of the connection wiring 72 is connected to the electrode 89, and the other end of the connection wiring 72 is connected to the inner peripheral end of the power receiving coil 66.

  The power receiving coil 66 is formed so as to be wound around the winding axis O2 in the winding direction D2 indicated by the arrow in the drawing as it goes from the inner peripheral end to the outer peripheral end. The power receiving coil 66 is formed so that the winding diameter increases from the inner peripheral end toward the outer peripheral end.

  One end of the connection wiring 73 is connected to the outer peripheral end of the power reception coil 66, and the other end of the connection wiring 73 is connected to the electrode 87 of the power reception capacitor 69.

  Specifically, after being pulled out from the connection wiring 73 and the electrode 87 to the winding axis O <b> 2 side, it is pulled out in a direction from the power reception capacitor 67 side toward the power reception capacitor 69, and the end of the connection wiring 73 is connected to the power reception coil 66. Has been. One end of the wiring 56 is connected to the electrode 86 of the power receiving capacitor 69. The wiring 56 is led out from the electrode 86 in the direction from the electrode 87 side to the electrode 86 side.

  As apparent from FIGS. 18 and 19, as shown in FIG. 15, the wiring 55, the power receiving capacitor 67, the connection wiring 70, the inner peripheral end of the power receiving coil 65, the power receiving coil 65, the outer peripheral end of the power receiving coil 65, and the connection wiring 71, the power receiving capacitor 68, the connection wiring 72, the inner peripheral end of the power receiving coil 66, the power receiving coil 66, the outer peripheral end of the power receiving coil 66, the connection wiring 73, the power receiving capacitor 69, and the wiring 56 are sequentially connected.

  FIG. 20 is a plan view schematically showing the power receiving unit 10 from which the central ferrite 64 and the like are omitted. In FIG. 20, a distance between the electrode 79 and the electrode 80 is a distance L7, and a distance between the electrode 86 and the electrode 87 is a distance L8.

  Here, the connection wiring 70 and the wiring 56 are closest to each other between the connection portion between the electrode 80 and the connection wiring 70 and the connection portion between the wiring 56 and the electrode 86. When the distance between the connection part of the electrode 80 and the connection wiring 70 and the connection part of the wiring 56 and the electrode 86 is a distance L9, the distance L9 is equal to or greater than the distance L7.

  Further, the connection wiring 73 and the wiring 55 are closest to each other between the connection portion between the connection wiring 73 and the electrode 87 and the connection portion between the wiring 55 and the electrode 79. When the distance between the connection portion of the connection wiring 73 and the electrode 87 and the connection portion of the wiring 55 and the electrode 79 is a distance L10, the distance L10 is not less than the distance L8.

  When the distance between the connection wiring 71 and the connection wiring 70 in the portion where the connection wiring 71 (third connection wiring) and the connection wiring 70 (first connection wiring) are closest is a distance L11, the distance L11 is the distance L7 and It is longer than the distance L9.

  When the distance between the connection wiring 72 and the connection wiring 73 in the portion where the connection wiring 72 (fourth connection wiring) and the connection wiring 73 (second connection wiring) are closest is the distance L12, the distance L12 is the distance L8 and the distance L10. Longer than.

  In FIG. 1, when power is transmitted from the power transmission device 5 to the power receiving module 2 in a contactless manner, power is first supplied from the power source 4 to the frequency converter 16. The frequency converter 16 converts the frequency of the power supplied from the power supply 4 and supplies it to the power transmission unit 15. The frequency of the current supplied to the power transmission unit 15 is, for example, the resonance frequency of the resonance circuit of the power transmission unit 15.

  A current whose frequency is the resonance frequency of the power transmission unit 15 flows through the power transmission coil 33 and the power transmission coil 34. This frequency is, for example, about 85 kHz, and the wavelength is several km.

  In FIG. 9, for example, when a current flows in the direction entering the power transmission coil 33 from the connection wiring 40, the current flows in a direction entering the power transmission coil 34 from the connection wiring 42 in FIG. 10. At this time, the current flows in the winding direction D1 in the power transmission coil 33, and also flows in the winding direction D1 in the power transmission coil 34. For this reason, the direction of the magnetic flux formed by the power transmission coil 33 matches the direction of the magnetic flux formed by the power transmission coil 34.

  Similarly, when current flows from the power transmission coil 33 to the connection wiring 40 in FIG. 9, current flows from the power transmission coil 34 to the connection wiring 42 in FIG. 10. For this reason, in the power transmission coil 33, a current flows in a direction opposite to the winding direction D1, and also in the power transmission coil 34, a current flows in a direction opposite to the winding direction D1. For this reason, the direction of the magnetic flux formed by the power transmission coil 33 matches the direction of the magnetic flux formed by the power transmission coil 34.

  That is, in FIG. 9, the winding direction D <b> 1 in which the power transmission coil 33 is wound from the inner peripheral end of the power transmission coil 33 connected to the connection wiring 40 toward the outer peripheral end of the power transmission coil 33 connected to the connection wiring 41. 10, a winding direction D1 in which the power transmission coil 34 is wound from the inner peripheral end of the power transmission coil 34 to which the connection wiring 42 is connected toward the outer peripheral end of the power transmission coil 34 to which the connection wiring 43 is connected. Match.

  For this reason, as described above, when a current flows in the power transmission coil 33 and the power transmission coil 34, the direction of the magnetic flux (magnetic field) formed by the power transmission coil 33 and the power transmission coil 34 is the same direction, and the power receiving unit is satisfactorily Electric power can be transmitted toward the terminal 10.

  FIG. 21 is a graph showing a voltage distribution in the power transmission unit 15 during power transmission. The horizontal axis of the graph of FIG. 21 indicates the position in the power transmission unit 15, and the vertical axis indicates the voltage. Moreover, this graph is an instantaneous value at the time of power transmission.

  Here, the power transmission unit 15 is an LC resonance circuit formed by connecting a plurality of capacitors and a plurality of coils in series. For this reason, when the frequency of the current supplied to the power transmission unit 15 matches or substantially matches the resonance frequency of the power transmission unit 15, the voltage at both ends of the power transmission unit 15 becomes 0V or substantially 0V. .

  And in the timing which the graph of FIG. 21 shows, the voltage drop has arisen in the power transmission capacitors 35, 36, and 37, and the voltage rises in the power transmission coils 33 and 34.

  In the LC resonance circuit in which a plurality of power transmission capacitors and a plurality of coils are alternately connected like the power transmission unit 15, the voltage phase of each power transmission capacitor 35, 36, 37 and the voltage phase of each power transmission coil 33, 34 are Are shifted from each other by 180 degrees (π (rad)). For this reason, at the timing when the voltage drops at the power transmission capacitors 35, 36, and 37, the voltage increases at the power transmission coils 33 and 34, and at the timing when the voltage at the power transmission capacitors 35, 36, and 37 increases, Voltage drop.

  In the example shown in FIG. 21, the capacities of the power transmission capacitors 35 and 37 coincide with or substantially coincide with each other, and the inductances of the respective power transmission coils 33 and 34 coincide with or substantially coincide with each other. . The capacity of the power transmission capacitor 36 is half that of the power transmission capacitors 35 and 37. In addition, the capacity of the power transmission capacitor 36 so that the voltage drop amount (voltage increase amount) generated in the power transmission capacitor 36 and the voltage increase amount (voltage drop amount) generated in each of the power transmission coils 33 and 34 substantially match each other, The inductances of the power transmission coils 33 and 34 are adjusted.

  As a result, the voltage drop amount (voltage increase amount) generated in the power transmission capacitors 35 and 37 is half of the voltage increase amount (voltage drop amount) generated in the power transmission coils 33 and 34, and the voltage drop amount (voltage increase) generated in the power transmission capacitor 36. Half).

As a result, the voltage of the electrode 50 and the connection wiring 40 substantially matches the voltage of the electrode 85 and the connection wiring 42. Each voltage fluctuates in the same way during power transmission, and becomes −A ₁ (V) at the timing shown in FIG.

Further, the voltage of the connection wiring 41 and the electrode 84 and the voltage of the connection wiring 43 and the electrode 83 match or substantially match. Each voltage periodically varies in the same manner, and becomes A ₁ (V) at the timing shown in FIG.

  The voltage of the electrode 50 and the connection wiring 40 (electrode 85 and connection wiring 42) and the voltage of the connection wiring 41 and electrode 84 (voltage of the connection wiring 43 and electrode 83) are inverted, and each voltage The absolute values of match or substantially match. As a result, during power transmission, the average voltage in the power transmission unit 15 becomes 0V or substantially 0V.

  In FIG. 21, a maximum voltage difference of A (V) occurs between the electrode 49 and the electrode 50 of the power transmission capacitor 35. In FIG. 11, even if a predetermined voltage difference occurs between the electrode 49 and the electrode 50 due to the design of the power transmission capacitor 35, the gap between the electrode 49 and the electrode 50 is prevented so that no adverse effect occurs between the electrode 49 and the electrode 50. A distance L1 is designed.

  As shown in FIG. 21, the voltage difference between the electrode 49 and the electrode 50 and the voltage difference between the connection wiring 40 and the wiring 29 are substantially the same, as shown in FIG. In addition, the distance L3 between the connection wiring 40 and the wiring 29 is not less than the distance L1. For this reason, a sufficient distance is ensured between the connection wiring 40 and the wiring 29 against a voltage difference generated between the connection wiring 40 and the wiring 29.

  A maximum voltage difference of A (V) occurs between the electrode 82 and the electrode 83 of the power transmission capacitor 37. In FIG. 11, even if a predetermined voltage difference (A (V)) occurs between the electrode 82 and the electrode 83 due to the design of the power transmission capacitor 37, the electrode 82 does not cause any harmful effect between the electrode 82 and the electrode 83. And the distance L2 between the electrodes 83 is designed.

  As shown in FIG. 21, the voltage difference generated between the connection wiring 43 and the wiring 28 substantially matches the voltage difference generated between the electrode 82 and the electrode 83. The distance L4 between the two is not less than the distance L2. Thus, a sufficient distance is ensured between the connection wiring 40 and the wiring 29 against the voltage difference between the connection wiring 40 and the wiring 29.

  In FIG. 21, the voltage difference between the connection wiring (fifth connection wiring) 40 and the connection wiring (seventh connection wiring) 41 is the same as that of the connection wiring (fifth connection wiring) 40 and the wiring (fourth external wiring) 29. Greater than the voltage difference between.

  On the other hand, as shown in FIG. 11, since the distance L5 between the connection wiring 40 and the connection wiring 41 is longer than the distance L3 between the connection wiring 40 and the wiring 29, the connection wiring 40 and the connection wiring 41 are connected. The distance between is sufficiently secured.

  In FIG. 21, the voltage difference between the connection wiring 43 and the connection wiring 42 is larger than the voltage difference between the connection wiring 43 and the wiring 28. On the other hand, as shown in FIG. 11, the distance L6 between the connection wiring 43 and the connection wiring 42 is longer than the distance L4 between the connection wiring 43 and the wiring 28. Therefore, a sufficient distance between the connection wiring 42 and the connection wiring 43 is ensured.

  The connection wiring 40 and the connection wiring 43 are drawn out from the respective electrodes 50 and 83 to the winding axis O1 side. The connection wiring 40 is drawn in a direction from the power transmission capacitor 37 side toward the power transmission capacitor 35 side, while the connection wiring 43 is drawn in a direction from the power transmission capacitor 35 side toward the power transmission capacitor 37.

  Thus, the connection wiring 40 and the connection wiring 43 are drawn out in directions opposite to each other, and the connection wiring 40 and the connection wiring 43 are prevented from coming close to each other. Therefore, as shown in FIG. 21, even if a predetermined voltage difference occurs between the connection wiring 40 and the connection wiring 43 during power transmission, various adverse effects are suppressed from occurring between the connection wiring 43 and the connection wiring 40. can do.

  Further, the wiring 28 is drawn from the electrode 49 in the direction from the electrode 50 side to the electrode 49 side, and the connection wiring 40 is drawn from the electrode 50 in the direction from the power transmission capacitor 37 side to the power transmission capacitor 35 side. Thus, since the electrodes from which the wiring 28 and the connection wiring 40 are drawn are different and the directions in which the wiring 28 and the connection wiring 40 are drawn are different, it is possible to prevent the wiring 28 and the connection wiring 40 from intersecting. Further, since the connection wiring 43 is also drawn in the direction from the power transmission capacitor 35 side toward the power transmission capacitor 37 side, the connection wiring 43 and the wiring 28 are prevented from crossing.

  The wiring 29 is drawn from the electrode 82 in the direction from the electrode 83 side toward the electrode 82 side. For this reason, the electrode to which the wiring 29 is connected is different from the electrode to which the connection wirings 40 and 43 are connected, and furthermore, since the lead-out direction of each wiring is different, the wiring 29 and the connection wirings 40 and 43 intersect. Can be suppressed. In FIG. 21, the voltage at the connection portion between the connection wiring 40 and the power transmission coil 33 matches the voltage at the connection portion between the connection wiring 43 and the power transmission coil 34. The connection wiring 40 is connected to the inner peripheral end of the power transmission coil 33, and the connection wiring 43 is also connected to the inner peripheral end of the power transmission coil 34. And the inner peripheral part of the power transmission coil 33 and the inner peripheral part of the power transmission coil 34 are arrange | positioned so that it may adjoin the up-down direction. Similarly, the outer peripheral end of the power transmission coil 33 and the outer peripheral end of the power transmission coil 34 are adjacent to each other in the vertical direction, and the respective voltages match or substantially match. For this reason, it is suppressed that a big voltage difference arises between the coil wire of the power transmission coil 33 and the coil wire of the power transmission coil 34 which overlap in an up-down direction.

  As described above, when a current is supplied to the power transmission device 5, an electromagnetic field is formed around the power transmission device 5, and the power receiving unit 10 receives power. Here, the frequency of the current received by the power receiving unit 10 is about 85 kHz, and the wavelength of the current is several km.

  For this reason, in FIG. 18, when the current flows in the direction of entering the power receiving coil 65 from the connection wiring 70, the current flows in the direction of entering the power receiving coil 66 from the connection wiring 72 in FIG. Therefore, the current flows in the winding direction D2 in the power receiving coil 66, and in FIG. 18, the current also flows in the winding direction D2 in the power receiving coil 66.

  In FIG. 18, when a current flows in a direction in which the current flows from the power receiving coil 65 to the connection wiring 70, a current flows in a direction in which a current flows from the power reception coil 66 to the connection wiring 72 in FIG. 19. For this reason, a current flows in the direction opposite to the winding direction D2 in the power receiving coil 65, and a current flows in the direction opposite to the winding direction D2 also in the power receiving coil 66.

  18, the winding direction D2 in which the power receiving coil 65 is wound from the inner end of the power receiving coil 65 to which the connection wiring 70 is connected to the outer peripheral end of the power reception coil 65 to which the connection wiring 71 is connected, and FIG. The winding direction D2 in which the power receiving coil 66 is wound is the same from the inner peripheral end of the power receiving coil 66 to which the connection wiring 72 is connected toward the outer peripheral end of the power receiving coil 66 to which the connection wiring 73 is connected.

  For this reason, as described above, when the magnetic field formed by the power transmission unit 15 reaches the power reception unit 10, the induced electromotive voltages generated in the power reception coil 65 and the power reception coil 66 are in the same direction, and the power can be satisfactorily obtained. Can receive power.

  FIG. 22 shows a voltage distribution in the power receiving unit 10 when the power receiving device 6 is receiving power. The horizontal axis of the graph shown in FIG. 22 indicates the position of the power receiving unit 10, and the vertical axis indicates the voltage. Moreover, the graph shown in FIG. 22 shows the instantaneous value at the time of power reception.

  Here, since the frequency of the current supplied to the power transmission unit 15 is the resonance frequency of the power transmission unit 15, the frequency of the magnetic field formed around the power transmission unit 15 is the resonance frequency of the power transmission unit 15. The power receiving unit 10 receives power from a magnetic field formed around the power transmitting unit 15, and the frequency of the current flowing in the power receiving unit 10 is the frequency of the magnetic field.

  Since the resonance frequency of the power reception unit 10 and the resonance frequency of the power transmission unit 15 match or substantially match, the frequency of the current flowing in the power reception unit 10 matches or substantially matches the resonance frequency of the power reception unit 10. Match.

  The power receiving unit 10 is a series LC resonance circuit in which a plurality of coils and capacitors are alternately connected in series. When a current having a resonance frequency flows through the series LC resonance circuit, the voltage at both ends of the resonance circuit is 0 V or substantially Therefore, it becomes 0V.

  For this reason, the voltage of the wiring 55 and the electrode 79 and the voltage of the electrode 86 and the wiring 56 are fixed to 0V. During power reception, the voltage phase of each of the power receiving capacitors 67, 68, 69 and the voltage phase of each of the power receiving coils 65, 66 are shifted from each other by 180 degrees. For this reason, a voltage rise occurs in the power receiving coils 65 and 66 at a timing when a voltage drop occurs in each of the power receiving capacitors 67, 68, and 69, and a voltage rise occurs in each power receiving capacitor 67, 68, and 69. Voltage drop. At the timing shown in FIG. 22, a voltage drop occurs in each of the power receiving capacitors 67, 68, and 69, and a voltage rise occurs in the power receiving coils 65 and 66.

  In the example shown in FIG. 22, the capacities of the power receiving capacitors 67 and 69 are the same or substantially the same, and the inductances of the power receiving coils 65 and 66 are the same or substantially the same. The capacity of the power receiving capacitor 68 is half of the capacity of the power receiving capacitors 67 and 69.

  Further, the capacitance of the power receiving capacitor 68 is set so that the voltage drop amount (voltage increase amount) generated in the power receiving coils 65 and 66 matches or substantially matches the voltage drop amount (voltage increase amount) generated in the power receiving capacitor 68. The inductance of each of the power receiving coils 65 and 66 is set.

  Thereby, the voltage drop amount (voltage increase amount) generated in the power receiving capacitors 67 and 69 is half of the voltage increase amount (voltage drop amount) generated in the power receiving coils 65 and 66, and the voltage drop amount (voltage increase) generated in the power receiving capacitor 68 is obtained. Half).

As a result, the voltage of the electrode 80 and the connection wiring 70 matches or substantially matches the voltage of the electrode 89 and the connection wiring 72. Each voltage fluctuates in the same manner periodically during power reception, and becomes −A ₂ (V) at the timing shown in FIG.

In addition, the voltage of the connection wiring 71 and the electrode 88 and the voltage of the connection wiring 73 and the electrode 87 coincide or substantially coincide. Each voltage fluctuates in the same manner during power reception, and is A ₂ (V) at the timing shown in FIG.

  The voltage of the electrode 80 and the connection wiring 70 (voltage of the electrode 89 and the connection wiring 72) and the voltage of the connection wiring 71 and the electrode 88 (voltage of the connection wiring 73 and the electrode 87) are reversed in polarity. The absolute value of each voltage is coincident or substantially coincident. As a result, during power reception, the average voltage in the power reception unit 10 is 0V or substantially 0V.

In FIG. 22, a maximum voltage difference of A ₂ (V) occurs between the electrode 79 and the electrode 80 of the power receiving capacitor 67. In FIG. 20, due to the design of the power receiving capacitor 67, even if a voltage difference of a predetermined voltage or more occurs between the electrode 79 and the electrode 80, the power receiving capacitor 67 is designed so as not to cause a harmful effect.

  As shown in FIG. 22, the voltage difference between the electrode 79 and the electrode 80 and the voltage difference between the connection wiring 70 and the wiring 56 match or substantially match. The distance L9 between the wiring 56 and the connection wiring 70 is not less than the distance L7 between the electrode 79 and the electrode 80.

  For this reason, a sufficient distance is secured against the voltage difference generated between the electrode 79 and the electrode 80.

A maximum voltage difference of A ₂ (V) is generated between the electrode 86 and the electrode 87 of the power receiving capacitor 69. In view of the design of the power receiving capacitor 69, even if a predetermined voltage difference (A ₂ (V)) occurs between the electrode 82 and the electrode 83, the electrode 82 and the electrode 83 are prevented from being adversely affected. The distance L8 is designed.

  22, the voltage difference generated between the connection wiring 70 and the wiring 56 matches or substantially matches the voltage difference generated between the electrode 86 and the electrode 87. The distance L9 to the wiring 56 is not less than the distance L8. For this reason, the distance between the connection wiring 70 and the wiring 56 is sufficiently secured against the voltage difference between the connection wiring 70 and the wiring 56.

  In FIG. 22, the voltage difference between the connection wiring 70 and the connection wiring 71 is larger than the voltage difference between the connection wiring 70 and the wiring 56. On the other hand, as shown in FIG. 20, the distance L11 between the connection wiring 70 and the connection wiring 71 is longer than the distance L9.

  For this reason, even if a voltage difference occurs between the connection wiring 70 and the connection wiring 71 during power reception, various adverse effects can be suppressed.

  Similarly, the voltage difference between the connection wiring 73 and the connection wiring 72 is larger than the voltage difference between the connection wiring 73 and the wiring 55, while the distance L12 between the connection wiring 72 and the connection wiring 73 is the distance L10. Longer than. For this reason, even if a voltage difference arises between the connection wiring 72 and the connection wiring 73, it can suppress that various bad effects arise.

  Here, as shown in FIG. 13, the connection wiring 70 and the connection wiring 73 are drawn from the electrode 80 and the electrode 87 to the winding axis O <b> 2 side. Thereafter, the connection wiring 70 is drawn out in the direction from the power receiving capacitor 69 side toward the power receiving capacitor 67 side, and the connection wiring 73 is drawn out in the direction from the power receiving capacitor 67 side toward the power receiving capacitor 69 side.

  Thus, since the connection wiring 70 and the connection wiring 73 are provided so as not to be close to each other, as shown in FIG. 22, even if a voltage difference occurs between the connection wiring 70 and the connection wiring 73 during power reception, Various adverse effects can be suppressed between the connection wiring 70 and the connection wiring 73.

  Further, the wiring 55 is drawn from the electrode 79 in the direction from the electrode 80 side to the electrode 79 side, and the connection wiring 40 is drawn from the electrode 80 in the direction from the power receiving capacitor 69 side to the power receiving capacitor 67 side. For this reason, it can suppress that the wiring 55 and the connection wiring 70 cross | intersect. Similarly, since the connection wiring 73 is drawn from the electrode 87 in the direction from the power reception capacitor 67 side to the power reception capacitor 69 side, the connection wiring 73 and the wiring 55 are prevented from crossing.

  The wiring 56 is drawn from the electrode 86 in the direction from the electrode 87 side to the electrode 86 side, and the connection wiring 70 is drawn in the direction from the power receiving capacitor 69 side to the power receiving capacitor 67 side. Crossing of the connection wirings 70 is suppressed.

  Also in the connection wiring 73, the connection wiring 73 and the wiring 56 can be prevented from crossing because they are drawn from the electrode 87 in the direction from the power reception capacitor 67 side toward the power reception capacitor 69 side. In FIG. 22, the voltage at the connection portion between the connection wiring 70 and the power reception coil 65 matches or substantially matches the voltage at the connection portion between the connection wiring 72 and the power reception coil 66. In FIG. 13, the connection wiring 70 is connected to the inner peripheral end of the power receiving coil 65, and the connection wiring 72 is also connected to the inner peripheral end of the power receiving coil 66. Further, the voltage at the outer peripheral end of the power receiving coil 65 and the voltage at the outer peripheral end of the power receiving coil 66 are matched or substantially matched. For this reason, it can suppress that a big voltage difference arises between the coil wire of the receiving coil 65 adjacent to an up-down direction, and the coil wire of the receiving coil 66. FIG.

  In the above embodiment, each of the power receiving unit 10 and the power transmitting unit 15 is an LC formed by sequentially connecting a capacitor, a coil, a capacitor, a coil, and a capacitor in series. Although a resonant circuit is employed, the resonant circuit is not limited to this example.

  FIG. 23 is a plan view schematically showing a modified example of the power transmission unit 15. In FIG. 23, the central ferrite 32 is omitted. The power transmission unit 15 </ b> A is not provided with the power transmission capacitor 36, and the power transmission coil unit 26 is also formed by one power transmission coil 90.

  That is, as shown in FIG. 24, the power transmission capacitor 35, the power transmission coil 90, and the power transmission capacitor 37 are sequentially connected in series between the wiring 28 and the wiring 29 to form the power transmission unit 15 </ b> A. Yes.

  When an alternating current whose frequency is the resonance frequency of the power transmission unit 15A flows through the power transmission unit 15A configured as described above, the voltage is distributed in the power transmission unit 15A as illustrated in FIG. Note that the horizontal axis of the graph shown in FIG. 25 indicates the position of the power transmission unit 15A, and the vertical axis indicates the voltage.

  The graph shown in FIG. 25 is also an instantaneous value during power transmission. At the timing shown in FIG. 25, a voltage drop occurs in the power transmission capacitor 35 and the power transmission capacitor 37, and a voltage rise occurs in the power transmission coil 90. .

  Also in power transmission unit 15A, when the frequency of the current flowing in power transmission unit 15A is the resonance frequency of power transmission unit 15A, the voltage at both ends of power transmission unit 15A is 0V or substantially 0V. For this reason, the average voltage in the power transmission unit 15A is 0V or substantially 0V.

  In the power transmission unit 15A, the distance L3 is not less than the distance L1, and the distance L4 is not less than the distance L2.

  FIG. 26 is a plan view schematically showing a modification of the power receiving unit 10, and the central ferrite is omitted. In the power receiving unit 10 </ b> A, the power receiving capacitor 68 is not provided, and the power receiving coil unit 61 is formed by one power receiving coil 91.

  As illustrated in FIG. 27, the power receiving unit 10 </ b> A includes a power receiving capacitor 67, a power receiving coil 91, and a power receiving capacitor 69 that are sequentially connected in series between the wiring 55 and the wiring 56. The power receiving capacitor 67 and the power receiving coil 91 are connected by the connection wiring 70, and the power receiving coil 91 and the power receiving capacitor 69 are connected by the connection wiring 73.

  When the power receiving unit 10A configured as described above receives power, a voltage is distributed in the power receiving unit 10A as shown in FIG. In FIG. 28, the horizontal axis indicates the position of the power receiving unit 10A, and the vertical axis indicates the voltage. Note that the graph shown in FIG. 28 is an instantaneous value during power reception.

  At the timing shown in FIG. 28, a voltage drop occurs in the power receiving capacitor 67 and the power receiving capacitor 69, and a voltage rises in the power receiving coil 91.

  In addition, since the frequency of the received current flowing in the power receiving unit 10A is the resonance frequency of the power receiving unit 10A, the voltage at both ends of the power receiving unit 10A is 0V.

  And the capacity | capacitance of the receiving capacitor 67 and the receiving capacitor 69 corresponds or substantially corresponds, and the voltage drop amount which arises in each receiving capacitor 67 and 69 corresponds or substantially corresponds.

  For this reason, during power reception, the average voltage of the power receiving unit 10A is 0V or substantially 0V. As shown in FIG. 26, the distance L9 is not less than the distance L7, and the distance L10 is not less than the distance L8.

  As mentioned above, although each embodiment based on this invention was described, each embodiment disclosed this time is an illustration and restrictive at no points. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to a power receiving device and a power receiving device.

  7 rectifier, 8 battery, 10 power receiving unit, 11, 17 housing, 15 power transmitting unit, 16 frequency converter, 20, 57 base plate, 21 lid, 22 partition plate, 22a, 22b, 24a, 58a, 58b through-hole, 23, 58 Resin lid, 24 Metal lid, 25, 60 Ferrite, 26 Power transmission coil unit, 27 Power transmission capacitor unit, 28, 29, 30, 55, 56 Wiring, 31, 63 Ring ferrite, 32, 64 Central ferrite, 33, 34 Power transmission coil, 35, 36, 37 Power transmission capacitor, 40, 41, 42, 43, 70, 71, 72, 73 Connection wiring, 45, 75 Substrate, 46, 47, 48, 76, 77, 78 Capacitor array, 49 , 50, 79, 80, 82, 83, 84, 85, 86, 87, 88, 89 electrode, 51, 81 capacitor element, 2A, 52B short sides 53A, 53B long side, 61 the receiving coil unit, 62 receiving capacitor unit, 65 and 66 receiving coil, 67, 68, 69 receiving capacitor.

Claims (8)

A power receiving coil unit including a power receiving coil formed by winding a coil wire so as to surround the periphery of the winding axis;
When connected to one end of the power receiving coil unit and viewing the power receiving coil unit from below the power receiving coil unit, a first power receiving capacitor disposed in the power receiving coil;
When connected to the other end of the power receiving coil unit and viewing the power receiving coil unit from below the power receiving coil unit, a second power receiving capacitor disposed in the power receiving coil,
A first external wiring connecting the first power receiving capacitor and an external device provided outside the power receiving coil unit;
A second external wiring for connecting the second power receiving capacitor and the external device provided outside the power receiving coil unit;
A first connection wiring connecting the first power receiving capacitor and the power receiving coil unit;
A second connection wiring for connecting the second power receiving capacitor and the power receiving coil unit;
With
The first power receiving capacitor includes a first electrode to which the first external wiring is connected, and a second electrode that is disposed closer to the winding shaft than the first electrode and to which the first connection wiring is connected. Including
The second power receiving capacitor includes a third electrode to which the second external wiring is connected, and a fourth electrode to which the second connection wiring is connected while being disposed at a position closer to the winding shaft than the third electrode. Including
A distance between the second external wiring and the first connection wiring in a portion where the second external wiring and the first connection wiring are closest to each other is not less than a distance between the first electrode and the second electrode. Yes,
A distance between the first external wiring and the second connection wiring in a portion where the first external wiring and the second connection wiring are closest to each other is not less than a distance between the third electrode and the fourth electrode. There is a power receiving device. The first power receiving capacitor and the second power receiving capacitor are provided so as to be adjacent to each other and arranged to be arranged in the extending direction of the coil wire,
The first external wiring is led out from the first electrode in a direction from the second electrode side to the first electrode side,
The second external wiring is drawn from the third electrode in a direction from the fourth electrode side to the third electrode side,
The first connection wiring is drawn out from the second electrode in a direction from the second power receiving capacitor side to the first power receiving capacitor side,
2. The power receiving device according to claim 1, wherein the second connection wiring is led out from the fourth electrode in a direction from the first power receiving capacitor side to the second power receiving capacitor side. The power receiving coil unit includes a first power receiving coil having one end connected to the first connection wiring and a second power receiving coil having one end connected to the second connection wiring.
The first power receiving coil and the second power receiving coil are arranged to overlap each other,
When the power receiving coil unit is viewed from below the power receiving coil unit, the third power receiving capacitor is disposed in the power receiving coil unit and includes a fifth electrode and a sixth electrode;
A third connection wiring connecting the fifth electrode and the other end of the first power receiving coil;
A fourth connection wiring connecting the sixth electrode and the other end of the second power receiving coil;
The distance between the first connection wiring and the third connection wiring in the portion where the first connection wiring and the third connection wiring are closest is the distance between the first connection wiring and the second external wiring. Longer than the distance of
The distance between the fourth connection wiring and the second connection wiring in the portion where the fourth connection wiring and the second connection wiring are closest to each other is between the first external wiring and the second connection wiring. The power receiving device according to claim 1, wherein the power receiving device is longer than the distance of. As it goes from the one end of the first power receiving coil to which the first connection wiring is connected to the other end of the first power receiving coil to which the third connection wiring is connected, the coil wire of the first power receiving coil is: Wound in the first winding direction,
The coil wire of the second power receiving coil extends from the other end of the second power receiving coil to which the fourth connection wiring is connected to the one end of the second power receiving coil to which the second connection wiring is connected. The power receiving device according to claim 3, wherein the power receiving device is wound in the first winding direction. A power transmission coil unit including a power transmission coil formed by winding a coil wire so as to surround the periphery of the winding axis;
When connected to one end of the power transmission coil unit and viewing the power transmission coil unit from above the power transmission coil unit, a first power transmission capacitor disposed in the power transmission coil,
When connected to the other end of the power transmission coil unit and viewing the power transmission coil unit from above the power transmission coil unit, a second power transmission capacitor disposed in the power transmission coil,
A third external wiring connecting the first power transmission capacitor and an external device provided outside the power transmission coil unit;
A fourth external wiring for connecting the second power transmission capacitor and the external device provided outside the power transmission coil unit;
A fifth connection wiring for connecting the first power transmission capacitor and the power transmission coil unit;
A sixth connection wiring for connecting the second power transmission capacitor and the power transmission coil unit;
With
The first power transmission capacitor includes a seventh electrode to which the third external wiring is connected, and an eighth electrode that is disposed closer to the winding shaft than the seventh electrode and to which the fifth connection wiring is connected. Including
The second power transmission capacitor includes a ninth electrode to which the fourth external wiring is connected, and a tenth electrode to which the sixth connection wiring is connected and is disposed at a position closer to the winding shaft than the ninth electrode. Including
A distance between the fourth external wiring and the fifth connection wiring in a portion where the fourth external wiring and the fifth connection wiring are closest to each other is not less than a distance between the seventh electrode and the eighth electrode. Yes,
A distance between the third external wiring and the sixth connection wiring in a portion where the third external wiring and the sixth connection wiring are closest to each other is not less than a distance between the ninth electrode and the tenth electrode. There is a power transmission device. The first power transmission capacitor and the second power transmission capacitor are provided so as to be adjacent to each other and arranged so as to be arranged in the extending direction of the coil wire,
The third external wiring is led out from the seventh electrode in a direction from the eighth electrode side to the seventh electrode side,
The fourth external wiring is led out from the ninth electrode in a direction from the tenth electrode side toward the ninth electrode side;
The fifth connection wiring is drawn out from the eighth electrode in a direction from the second power transmission capacitor side to the first power transmission capacitor side,
The power transmission device according to claim 5, wherein the sixth connection wiring is led out from the tenth electrode in a direction from the first power transmission capacitor side to the second power transmission capacitor side. The power transmission coil unit includes a first power transmission coil in which the fifth connection wiring is connected to one end, and a second power transmission coil in which the sixth connection wiring is connected to one end,
The first power transmission coil and the second power transmission coil are arranged to overlap each other,
When the power transmission coil unit is viewed from above the power transmission coil unit, the power transmission coil unit is disposed in the power transmission coil unit, and a third power transmission capacitor including an eleventh electrode and a twelfth electrode;
A seventh connection wiring connecting the eleventh electrode and the other end of the first power transmission coil;
An eighth connection wiring connecting the twelfth electrode and the other end of the second power transmission coil;
The distance between the fifth connection line and the seventh connection line in the portion where the fifth connection line and the seventh connection line are closest is the distance between the fifth connection line and the fourth external line. Longer than the distance of
The distance between the eighth connection wiring and the sixth connection wiring in the portion where the eighth connection wiring and the sixth connection wiring are closest is the distance between the sixth connection wiring and the third external wiring. The power transmission device according to claim 5 or 6, which is longer than a distance of. As it goes from the one end of the first power transmission coil to which the fifth connection wiring is connected to the other end of the first power transmission coil to which the seventh connection wiring is connected, the coil wire of the first power transmission coil is Wound in the second winding direction,
As it goes from the other end of the second power transmission coil to which the eighth connection wiring is connected to the one end of the second power transmission coil to which the sixth connection wiring is connected, the coil wire of the second power transmission coil is: The power transmission device according to claim 7, wherein the power transmission device is wound in the second winding direction.

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