JP6138504B2 - Power transmission device and power reception device - Google Patents

Description

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

  Conventionally, various power transmission devices that transmit power to a power receiving device in a contactless manner, power receiving devices that receive power from a power transmission device in a contactless manner, and the like have been proposed.

  As one of such proposals, Japanese Patent Laying-Open No. 2011-50127 (Patent Document 1) discloses a power receiving unit that employs an H-type core and has a winding wound around a narrow portion of the core. .

  Further, the wireless power device described in Japanese Patent Application Laid-Open No. 2010-239777 changes the coupling state between the power reception coil and the power extraction coil in accordance with the coupling state between the power transmission coil and the power reception coil.

JP 2011-50127 A JP 2010-239777 A

  It is difficult to always keep the positional relationship between the power receiving device and the power transmitting device constant. For example, when non-contact power feeding is applied to a vehicle or the like, it is conceivable that the positional relationship between the power receiving device and the power transmitting device changes at each power feeding time depending on the parking position or the coil mounting position of the vehicle. Even in the case of contactless power feeding to a portable terminal or the like, it is troublesome to match the position where the terminal is placed on the power receiving apparatus.

  The coil wound around the H-shaped core described in Japanese Patent Application Laid-Open No. 2011-50127 is configured so that the coil length and coil position can be selected so that the coupling state between the power receiving coil and the power receiving coil is improved during power feeding. It is also possible. However, for example, when a plurality of coils are wound while changing the position to one H-shaped core, there is a coil in which the distance between the coil end portion and the thick-width portion of the H-shaped core is increased. When such a coil is selected, the advantage of the H-type core that the magnetic field coupling is improved by the thick portion of the H-type core cannot be enjoyed.

  An object of the present invention is to provide a power transmission device and a power reception device that can enjoy the advantages of an H-shaped core and the advantages of a coil configuration that can be adjusted in coil length or coil position.

The present invention is a power transmission device that has a core including a primary coil facing a core including a secondary coil of a power reception device mounted on a vehicle, and transmits power in a non-contact manner to the power reception device ,
The core of the power receiving device is arranged to form a flat narrow portion around which the secondary coil is wound, and to form a narrow portion and an H shape at both ends of the narrow portion. And a winding core of a secondary coil wound around the narrow portion of the H-type core faces in the longitudinal direction of the vehicle. Mounted on the vehicle as
The power transmission device
A core formed of a magnetic material;
A plurality of primary coils wound around the core;
A coil selector to connect to a power source by selecting a portion of the plurality of primary coils,
Equipped with a,
The core of the power transmission device is
A plurality of narrow portions having a shape substantially equal to the narrow portion of the power receiving device and arranged linearly in the longitudinal direction of the vehicle ;
A plurality of wide portions having a shape substantially the same as the wide portion of the power receiving device, disposed at both end positions in the arrangement of the plurality of narrow portions and an intermediate position between adjacent narrow portions;
Have
The plurality of narrow portions and the plurality of thick portions are alternately arranged along a straight line and beyond the length of the H-type core of the power receiving device,
The primary coil is not wound around the plurality of thick portions, and the primary coil is wound around each of the plurality of narrow portions,
The coil selection unit is configured to select a primary coil wound around one of the plurality of narrow portions and connect it to the power source .

Further, in the power transmission device of the present invention, the core has a shape in which the size in the vehicle direction is half that of the narrow width portion of the power reception device, and a plurality of fine wires arranged linearly in the front-rear direction of the vehicle. The width portions and the plurality of thick width portions arranged at both end positions in the arrangement of the plurality of narrow width portions and the intermediate positions of the adjacent narrow width portions alternately along the straight line, and the H type of the power receiving device You may make it arrange | position beyond the length of a core.

In addition, the present invention is a power receiving device that is mounted on a vehicle and has a core that includes a secondary coil that faces a core that includes a primary coil of the power transmitting device, and that receives power from the power transmitting device in a contactless manner.
The core of the power transmission device includes a flat narrow portion around which the primary coil is wound, and a primary coil disposed at both ends of the narrow portion so as to form a narrow portion and an H-shape. An H-shaped core formed of a magnetic material having a wide portion that is not wound, and the ground surface so that the winding axis of the primary coil wound around the narrow portion of the H-shaped core faces the longitudinal direction of the vehicle Installed on the side,
The power receiving device
A core formed of a magnetic material;
A plurality of secondary coils wound around the core;
A coil selector that connects to a load using a selected subset of the plurality of secondary coils,
Equipped with a,
The core of the power receiving device is
A plurality of narrow portions having a shape substantially equal to the narrow portion of the power transmission device and arranged linearly in the longitudinal direction of the vehicle ,
A plurality of wide portions having a shape substantially equal to the thick width portion of the power transmission device, disposed at both end positions in the arrangement of the plurality of narrow width portions and an intermediate position between the adjacent narrow portions ,
Have
A plurality of narrow portions and a plurality of thick portions are alternately arranged along a straight line and beyond the length of the H core of the power transmission device,
The secondary coil is not wound around the plurality of thick portions, and the secondary coil is wound around each of the plurality of narrow portions,
A coil selection part is comprised so that the secondary coil wound by one of several narrow width parts may be selected and connected to load .

Further, in the power receiving device of the present invention, the core has a shape in which the size in the vehicle direction is half that of the narrow width portion of the power transmission device, and a plurality of fine wires arranged linearly in the front-rear direction of the vehicle. The width portion and the plurality of thick width portions arranged at both end positions in the arrangement of the plurality of narrow width portions and the intermediate position of the adjacent narrow width portions alternately along the straight line, and the H type of the power transmission device You may make it arrange | position beyond the length of a core.

  ADVANTAGE OF THE INVENTION According to this invention, the power transmission apparatus and power receiving apparatus which can respond to the change of the position or coil length of the other party of power transmission / reception can be implement | achieved, utilizing the advantage of an H-type core.

It is a figure which shows the electric power transmission system, vehicle, power receiving apparatus, power transmission apparatus, etc. which concern on Embodiment 1. FIG. It is the figure which showed the more detailed structure of the power transmission part 56 of FIG. It is the figure shown about the mounting direction of the coil unit 24 in a vehicle. It is a side view for demonstrating the magnitude | size and shape of the primary coil and secondary coil which were wound by the standard H-shaped core. It is a top view for demonstrating the magnitude | size and shape of the primary coil and secondary coil which were wound by the standard H-shaped core. It is a perspective view for demonstrating the magnetic flux which generate | occur | produces in a coil unit. It is sectional drawing for demonstrating the passage route of the magnetic flux of a coil unit. It is sectional drawing which has arrange | positioned the coil unit of Embodiment 1 shown in FIG. 2 to the power transmission side. It is sectional drawing which has arrange | positioned the coil unit of the modification of Embodiment 1 to the power transmission side. It is the figure which showed the relationship between the position shift of the X direction of the coil of the coil unit of Embodiment 1, and the change of a coupling coefficient. 4 is a schematic diagram schematically showing a power transmission system, a vehicle, a power reception device, a power transmission device, and the like according to Embodiment 2. FIG.

  Hereinafter, the present embodiment will be described with reference to the drawings. In addition, although several embodiment is described below, combining the structure demonstrated by each embodiment suitably is planned from the beginning of an application. Note that substantially the same configuration is denoted by the same reference numeral, and the description thereof may not be repeated.

[Embodiment 1]
FIG. 1 is a diagram illustrating a power transmission system, a vehicle, a power reception device, a power transmission device, and the like according to the first embodiment.

  The power transmission system according to the first embodiment includes a vehicle 10 and a power transmission device 51. The power receiving device 11 of the vehicle 10 mainly receives power from the power transmitting device 51.

  The parking space 52 is provided with a line indicating a stop, a parking position, and a parking range so that the vehicle 10 stops at a predetermined position.

  The power transmission device 51 includes a high frequency power driver 54 connected to the external power supply 53, a control unit 55 that controls driving of the high frequency power driver 54, the power transmission unit 56 connected to the high frequency power driver 54, a communication unit 57, and the like. including.

  In FIG. 1, a vehicle 10 includes a communication unit 9, a vehicle main body 10 </ b> A, a power receiving device 11 provided in the vehicle main body 10 </ b> A, a rectifier 13 connected to the power receiving device 11, and a DC / DC connected to the rectifier 13. DC converter 14, battery 15 connected to DC / DC converter 14, power control unit (PCU (Power Control Unit)) 16, motor unit 17 connected to power control unit 16, DC / DC A vehicle ECU (Electronic Control Unit) 12 that controls driving of the converter 14 and the power control unit 16 is provided.

  The rectifier 13, the converter 14, and the battery 15 form a power receiving unit 18 that receives electric power from the outside and stores the electric power in the battery 15.

  The vehicle main body 10A includes a body in which an engine compartment and an occupant accommodation chamber are formed, and an exterior part such as a fender provided in the body. The vehicle 10 further includes a front wheel 19F and a rear wheel 19B.

  In the first embodiment, a hybrid vehicle including an engine will be described. However, the application target of the present invention is not limited to a hybrid vehicle. For example, the present invention may be applied to an electric vehicle that does not include an engine, a fuel cell vehicle that includes a fuel cell instead of the engine, and the like.

  The rectifier 13 is connected to the power receiving device 11, converts an alternating current supplied from the power receiving device 11 into a direct current, and supplies the direct current to the DC / DC converter 14.

  The DC / DC converter 14 adjusts the voltage of the direct current supplied from the rectifier 13 and supplies it to the battery 15. The DC / DC converter 14 is not an essential component and may be omitted. In this case, the DC / DC converter 14 can be substituted by providing a matching unit for matching impedance with the power transmission device 51 between the power transmission unit 56 and the high frequency power driver 54. Further, the DC / DC converter 14 may be substituted by a method using the turns ratio of the transformer.

  Power control unit 16 includes a converter connected to battery 15 and an inverter connected to the converter. The converter adjusts (boosts) the direct current supplied from the battery 15 and supplies it to the inverter. The inverter converts the direct current supplied from the converter into an alternating current and supplies it to the motor unit 17. In addition, it is good also as a structure by which a voltage is directly supplied from a battery to an inverter without including a converter.

  The motor unit 17 employs, for example, a three-phase AC motor and is driven by an AC current supplied from an inverter of the power control unit 16.

  The power receiving device 11 includes a power receiving unit 20. The power receiving unit 20 includes a coil unit 24 and a capacitor 23 connected to the coil unit 24. The coil unit 24 includes a ferrite core 21 and a secondary coil 22 wound around the ferrite core 21. In the power receiving unit 20 as well, the capacitor 23 is not an essential component. The secondary coil 22 is connected to the rectifier 13. Although not shown in particular, a closed loop is formed by the secondary coil 22 and the capacitor 23, and a coil for taking out AC power received by the secondary coil 22 from the secondary coil 22 by electromagnetic induction and outputting it to the rectifier 13 is separately provided. May be.

  The capacitor 23 is provided to adjust the natural frequency of the resonance circuit. When a desired natural frequency is obtained using the stray capacitances of the primary coil 58 and the secondary coil 22, the capacitor 23 is provided. It is good also as a structure which does not provide. Although the secondary coil 22 and the capacitor 23 are connected in parallel, the secondary coil 22 and the capacitor 23 may be connected in series.

  The power transmission unit 56 includes a capacitor 33, a coil selection unit 32, and a coil unit 31. As will be described later with reference to FIG. 2, the coil unit 31 includes a plurality of primary coils.

  The operation of the power transmission device 51 after the vehicle 10 stops as shown in FIG. 1 will be briefly described. When the vehicle 10 stops, the vehicle 10 transmits information on the size of the secondary coil 22 and the mounting position on the vehicle to the communication unit 57 of the power transmission device 51 from the communication unit 9. The information on the size of the secondary coil 22 includes the length of the secondary coil 22 in the direction in which the winding axis extends. The information regarding the mounting position includes a numerical value indicating whether the mounting position of the secondary coil 22 on the vehicle is the front portion, the center portion, or the rear portion of the vehicle. In the power transmission device 51, the coil selection unit 32 is made to select the primary coil based on the information transmitted by the control unit 55.

  FIG. 2 is a diagram showing a more detailed configuration of the power transmission unit 56 of FIG. Referring to FIG. 2, power transmission unit 56 includes a capacitor 33, a coil selection unit 32, and a coil unit 31. Power is supplied to the power transmission unit 56 from the external power source 53 via the high frequency power driver 54 and the matching unit 60.

  The coil unit 31 includes a core 70 made of a magnetic material and a plurality of primary coils L1 to L3 wound around the core 70. The coil selection part 32 can adjust the coil length or coil position of the coil used for electric power feeding by selecting a part of primary coils L1-L3 and connecting it to load or a power supply.

  The core 70 is formed between a plurality of thick portions 71 to 74 around which no winding is wound and a plurality of thick portions 71 to 74. The core 70 is narrower than each of the thick portions 71 to 74, and is a primary coil. And a plurality of narrow portions 81 to 83 around which the windings L1 to L3 are wound.

  The coil selector 32 includes a switch 91 that is turned on when the coil L1 is selected, a switch 92 that is turned on when the coil L2 is selected, and a switch 93 that is turned on when the coil L3 is selected. The coil selector 32 selects any one of the coils L1 to L3.

  Since each of the coils L1 to L3 has a different winding position with respect to the core 70, the self-inductance varies with the same number of turns. If the self-inductance is different, the self-resonance frequency also varies, so it is preferable to change the capacitance value Cs of the capacitor 33 as well. However, if the switchable configuration such as the switches 91 to 93 is also provided in the capacitor 33, the configuration becomes complicated and the number of parts of the power transmission unit 56 increases.

  Therefore, the number of turns (number of turns) T of the coils L1 to L3 is adjusted by the position of the coil with respect to the core 70 so that the self-inductance becomes equal. For example, in the configuration of FIG. 2, the number of turns of the coils L1 and L3 located at both ends of the core 70 is 16T, and the number of turns of the coil L2 at the center of the core 70 is set to 14T. Thereby, the capacitance value Cs of the capacitor 33 can be set to a common value, and the capacitor 33 can be commonly used for the coils L1 to L3.

  FIG. 3 is a view showing the mounting direction of the coil unit 24 in the vehicle. As shown in FIG. 5, the coil unit 24 is arranged so that the winding axis faces along the longitudinal direction X of the vehicle.

  FIG. 4 is a side view for explaining the size and shape of a primary coil and a secondary coil wound around a standard H-shaped core.

  Referring to FIG. 4, coil unit 24 and coil unit 30 are arranged to face each other in the vertical direction Z with air gap AG interposed therebetween. The vehicle-side coil unit 24 includes an electromagnetic wave shielding back plate 202, a core 204, and a coil 206 wound around the core 204.

  The coil unit 30 on the power transmission device side includes a back plate 212 for shielding electromagnetic waves, a core 214, and a coil 216 wound around the core 214.

  FIG. 5 is a top view for explaining the size and shape of a primary coil and a secondary coil wound around a standard H-shaped core. Since coil unit 24 and coil unit 30 in FIG. 4 have the same shape, FIG. 5 shows only dimensions of coil unit 30 and description of the corresponding parts of coil unit 24 will not be repeated.

  With reference to FIGS. 4 and 5, coil unit 30 includes a back plate 212, a core 214, and a coil 216. The core 214 includes thick portions 222 and 226 and a narrow portion 224. A coil 216 is wound around the narrow portion 224. The thick width portions 222 and 226 are not wound with a coil, and the surface facing the power receiving portion is a path for magnetic flux. The core 214 is made of a magnetic material such as ferrite. The coil 216 preferably uses a copper wire or the like.

  The back plate 212 is 600 mm in the left-right direction (width direction) Y and 600 mm in the front-rear direction X. The width direction Y size of the wide portions 222 and 226 is 300 mm each. The size of the wide portions 222 and 226 in the front-rear direction X is 40 mm. The size of the narrow portion 224 in the width direction Y is 150 mm. The size of the narrow width portion 224 in the front-rear direction X is 240 mm, and the coil 206 is wound around the central portion (230 mm).

  FIG. 6 is a perspective view for explaining the magnetic flux generated in the coil unit. FIG. 7 is a cross-sectional view for explaining a magnetic flux passing path of the coil unit.

  6 and 7, the coil unit 31 on the power transmission side includes a primary coil 216, and the coil unit 24 on the power reception side includes a secondary coil 206. The primary coil 216 is wound around a core 214 made of an H-shaped flat magnetic material. The secondary coil 206 is wound around a core 204 formed of an H-shaped flat magnetic material.

  In each of the coil units 24 and 31, the magnetic flux passes through the central portion (inside the magnetic material) of the coil wound around the magnetic material. The magnetic flux that has passed through the inside of the core 214 from one end of the primary coil 216 toward the other end is directed toward one end of the secondary coil 206, and the inside of the core 204 is moved from one end of the secondary coil 206 toward the other end. And return to one end of the primary coil 216. Since an alternating current flows through the power transmission unit, when the direction of the current flowing through the coil is reversed, the direction of the magnetic flux is also reversed.

  FIG. 8 is a cross-sectional view in which the coil unit of Embodiment 1 shown in FIG. 2 is arranged on the power transmission side. In FIG. 8, coil unit 24 arranged on the power receiving side is the same as that shown in FIGS. 4 and 5 (one-coil H-type core), and therefore description thereof will not be repeated here.

  Referring to FIG. 8, the coil unit 31 has a configuration in which three coil units wound around the standard H-shaped core described in FIGS. 4 and 5 are arranged vertically in the front-rear direction X.

  The coil unit 31 includes a back plate 312, a core 314, and a plurality of primary coils 316, 318, and 320. The size in the front-rear direction X of the back plate 312 is 1160 mm, and the size in the front-rear direction X of the narrow portion of the core 314 around which the plurality of primary coils 316, 318, 320 are wound is 240 mm. The size in the front-rear direction X of the wide portion where the coil is not wound is 40 mm.

  About the size of the left-right direction Y, it is the same as that of the case shown in FIG. 5, the size of the left-right direction Y of a backplate is 600 mm, the size of the thick part of a core is 300 mm, and the narrow part of a core The size is 150 mm.

  The shape of the core 314 of the coil unit shown in FIG. 2 and FIG. 8 is a shape (fishbone shape) in which thick portions and narrow portions are alternately arranged.

  FIG. 9 is a cross-sectional view in which the coil unit according to the modification of the first embodiment is arranged on the power transmission side. In FIG. 9, coil unit 24 arranged on the power receiving side is the same as that shown in FIGS. 4 and 5, and therefore description thereof will not be repeated here.

  Referring to FIG. 9, the coil unit 401 has a configuration in which six coil units whose sizes in the front-rear direction X of the coil units described in FIGS. 4 and 5 are halved are arranged vertically in the front-rear direction X.

  The coil unit 401 includes a back plate 412, a core 414, and a plurality of primary coils 416, 418, 420, 422, 424, 426. The size of the back plate 312 in the front-rear direction X is 1280 mm, and the size in the front-rear direction X of the narrow portion of the core 414 around which the plurality of primary coils 416, 418, 420, 422, 424, 426 are wound is The size in the front-rear direction X of the thick portion where the coil of the core 414 is not wound is 40 mm.

  About the size of the left-right direction Y, it is the same as that of the case shown in FIG. 5, the size of the left-right direction Y of a backplate is 600 mm, the size of the thick part of a core is 300 mm, and the narrow part of a core The size is 150 mm.

  FIG. 10 is a diagram showing the relationship between the positional deviation in the X direction of the coil of the coil unit of Embodiment 1 and the change in the coupling coefficient. In FIG. 10, the horizontal axis represents the amount of displacement (mm) between the power transmission unit and the power reception unit in the X direction (vehicle longitudinal direction), and the vertical axis represents the coupling coefficient k.

  The graph G1 is a graph showing characteristics when the standard one-coil H-type core shown in FIGS. 4 and 5 is arranged on both the power transmission side and the power reception side. The reference point at which the positional deviation amount is 0 mm is a state where the cores are completely facing each other as shown in FIG. The graph G1 shows that the coupling coefficient k becomes the largest when the positional deviation amount is 0 mm, and the coupling coefficient becomes smaller as the positional deviation amount increases until the positional deviation in the X direction reaches 300 mm.

  As shown in FIG. 8, the graph G2 shows characteristics when a standard one-coil H-shaped core is disposed on the power receiving side and a fishbone-shaped core around which three coils are wound is disposed on the power transmitting side. It is a graph. As shown in FIG. 8, the reference point at which the positional deviation amount is 0 mm is a state in which the central coil 318 on the power transmission side and the coil 206 on the power reception side are completely facing each other. The graph G2 is the same as the graph G1 in that the coupling coefficient k becomes the largest when the positional deviation amount is 0 mm. However, once the misalignment in the X direction exceeds 120 mm, the coupling coefficient is once minimized at k = 0.191. After that, when the misalignment amount increases, the coupling coefficient increases, and the misalignment amount reaches a maximum again around 250 mm. It becomes. From the misalignment amount that takes this maximum value to the misalignment amount of 500 mm, the coupling coefficient decreases as the misalignment amount increases.

  The switching of the coil selection unit 32 in FIG. 2 is controlled until the switch 92 is turned on and the switches 91 and 93 are turned off until the k-direction positional deviation amount is 0 to the minimum value, and k takes the minimum value. When the deviation becomes larger than the amount of displacement, the switch 93 is controlled to be on and the switches 91 and 92 are controlled to be off.

  The graph G3 shows the characteristics when a standard one-coil H-shaped core is disposed on the power receiving side and a fishbone-shaped core wound with six coils is disposed on the power transmitting side, as shown in FIG. It is a graph. As shown in FIG. 8, the reference point at which the positional deviation amount is 0 mm is a state in which the central coils 420 and 422 on the power transmission side and the coil 206 on the power reception side are completely facing each other. The graph G3 is the same as the graph G1 in that the coupling coefficient k becomes the largest when the positional deviation amount is 0 mm. However, the coupling coefficient takes a minimum value at two positions in the X direction, that is, around 80 mm and 240 mm. The minimum value of the positional deviation in the X direction around 240 mm is smaller, and the coupling coefficient is k = 0.193.

  Although the configuration of the coil selection unit is not illustrated, in the configuration illustrated in FIG. 9, two coils used on the power transmission side can be selected. When the amount of positional deviation in the X direction as shown in FIG. 9 is 0, the coils 420 and 422 are selected, and the other coils are not selected. As the shift amount increases, the coils 422 and 424 are selected, the other coils are not selected, the coils 424 and 426 are selected, and the other coils are not selected. Transition. In the case of misalignment in the opposite direction, the coils 418 and 420 are selected as the amount of deviation increases, the other coils are deselected, the coils 416 and 418 are selected, and the other coils are deselected. The selected state of the coil sequentially changes to the state to be performed.

  As shown in FIG. 10, in the characteristics shown in the graph G1, the power reception efficiency η becomes smaller than 90% when the positional deviation amount is larger than 120 mm. However, in the characteristics shown in the graphs G2 and G3, the positional deviation amount is The power receiving efficiency η can be 90% or more in the range of 0 to 370 mm and 0 to 400 mm. Therefore, the range in which power can be continuously received with respect to the displacement amount is expanded as compared with the example shown in the graph G1. Further, by providing a thick portion not only at both ends of the core but also at the middle portion, the distance between the coil end to be used and the thick portion can be reduced, and a magnetic flux path as shown in FIG. 9 is formed. In this case, the coupling strength between the power receiving unit and the power transmitting unit can be increased. In addition, since the coil is not wound around the thick portion, when the selected coil is an intermediate coil, providing the thick portion facilitates the passage of the magnetic flux toward the opposing unit.

[Embodiment 2]
In the first embodiment, an example in which a core around which a plurality of coils is wound is arranged in the power transmission device is shown, but a core around which a plurality of coils is wound may be arranged in the power receiving device (vehicle).

  FIG. 11 is a schematic diagram schematically illustrating a power transmission system, a vehicle, a power receiving device, a power transmitting device, and the like according to the second embodiment.

  The power transmission system according to the second embodiment includes a vehicle 210 including a power reception device 211 and a power transmission device 251 including a power transmission unit 56. The power receiving device 211 of the vehicle 210 mainly receives power from the power transmission unit 56.

  The power transmission unit 256 includes a coil unit 100 and a capacitor 101, and the coil unit 100 includes a core 102 and a primary coil 103 wound around the peripheral surface of the core 102.

  The vehicle 210 is different from the configuration of FIG. 1 in that it includes a power receiving device 211 instead of the power receiving device 11. Since other configurations are the same as those in FIG. 1, description thereof will not be repeated here.

  The power receiving device 211 includes a coil unit 230 and a coil selection unit 232. The coil unit 230 has the same configuration as the three-coil coil unit 31 shown in FIGS. 2 and 8 or the six-coil coil unit 401 shown in FIG. 9 in which a plurality of coils are wound around a fishbone core. can do. The coil selector 232 can have the same configuration as that of the coil selector 32 shown in FIG.

  In addition, the power transmission unit 256 can use the standard H-core 1-coil unit described with reference to FIGS. 4 and 5.

  By adopting such a configuration, the same effect as in the first embodiment can be obtained.

  Finally, Embodiments 1 and 2 are summarized with reference to the drawings again. Referring mainly to FIG. 1 and FIG. 2, the power transmission device 51 transmits electric power to the secondary coil 22 mounted on the vehicle 10 in a contactless manner. The power transmission device 51 includes a core (70 in FIG. 2; 314 in FIG. 8; 414 in FIG. 9) formed of a magnetic material, and a plurality of primary coils (L1, L2, FIG. 2) wound around the core. L3; 316, 318, 320 in FIG. 8; 416, 418, 420, 422, 424, 426) in FIG. 9 and a part of a plurality of primary coils are selected and connected to a load or a power source for power transmission. And a coil selector 32 capable of adjusting the coil length or coil position of the coil to be used. The core is formed between the plurality of thick portions 71 to 74 where the winding is not wound and the plurality of thick portions 71 to 74, and is narrower than the thick portions 71 to 74. It includes a plurality of narrow portions 81 to 83 around which the windings are wound.

  Preferably, the cores 70, 314, and 414 include three or more narrow portions as a plurality of narrow portions. The cores 70 and 314 in FIGS. 2 and 8 have three narrow portions, and the core 414 in FIG. 9 has six narrow portions.

  Preferably, as shown in FIG. 2, the plurality of wide portions 71 to 74 and the plurality of narrow portions 81 to 83 are alternately arranged along a straight line. In the example of FIG. 9 as well, the configuration of FIG. 2 has a shape extended to have six narrow portions.

  More preferably, the straight line is a straight line extending in the front-rear direction of the vehicle 10 stopped so that power can be received from the primary coil (for example, in the direction shown in FIG. 1).

  Preferably, the cores 70, 314, and 414 have a plane that can face the vehicle 10, and the width of the narrow width portions 81 to 83 in the plane is narrower than the width of the wide width portions 71 to 74.

  Referring to FIG. 11, power reception device 211 is mounted on vehicle 210 and receives electric power from primary coil 103 of 251 power transmission device in a contactless manner. Similarly to FIG. 2, the power receiving device 211 includes a core 70 formed of a magnetic material, a plurality of secondary coils L1 to L3 wound around the core, and a part of the plurality of secondary coils L1 to L3. And a coil selection unit 232 capable of adjusting the coil length or coil position of the coil used for power reception. The coil selector 232 has the same configuration as the coil selector 32 in FIG. The core 70 is formed between a plurality of thick portions 71 to 74 around which no winding is wound and a plurality of thick portions 71 to 74, and is narrower than the thick portions 71 to 74. And a plurality of narrow portions 81 to 83 around which the windings of the coils L1 to L3 are wound.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The 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. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  9,57 communication unit 10,210 vehicle, 10A vehicle main body, 11, 191, 211 power receiving device, 13 rectifier, 14 converter, 15 battery, 16 power control unit, 17 motor unit, 18 power receiving unit, 19B rear wheel, 19F Front wheel, 20,196 Power receiving unit, 21 Ferrite core, 22,206 Secondary coil, 23, 33, 101, 195, 198 Capacitor, 24, 30, 31, 100, 401 Coil unit, 32 Coil selection unit, 51, 190 , 251 Power transmission device, 52 Parking space, 53 External power supply, 54 High frequency power driver, 55 Control unit, 56, 193, 256 Power transmission unit, 60 Matching unit, 70, 102, 204, 214, 314, 414 Core, 71-74 , 222, 226 Wide part, 81-83, 22 Narrow part, 91-93 switch, 58, 103, 192, 194, 197, 199, 204, 216, 316, 318, 416, 418, 420, 422, 424, L1-L3 coils, 202, 212, 312, 412 Back plate.

Claims (8)

A power transmission device that has a core including a primary coil facing a core including a secondary coil of a power reception device mounted on a vehicle, and transmits power in a non-contact manner to the power reception device ,
The core of the power receiving device is disposed so as to form a flat narrow portion around which the secondary coil is wound, and to form the narrow portion and an H shape at both ends of the narrow portion. And a winding axis of the secondary coil wound around the narrow portion of the H-type core, which is formed of a magnetic body having a thick portion where the secondary coil is not wound. Is mounted on the vehicle so that the
The power transmission device is:
A core formed of a magnetic material;
A plurality of primary coils wound around the core;
A coil selector to connect to a power source by selecting a portion of said plurality of primary coils,
With
The core of the power transmission device is:
A plurality of narrow portions having a shape substantially equal to the narrow portion of the power receiving device and arranged linearly in the front-rear direction of the vehicle ;
A plurality of wide portions having a shape substantially equal to the wide portion of the power receiving device, disposed at both end positions in the array of the plurality of narrow portions and an intermediate position between the adjacent narrow portions;
Have
The plurality of narrow width portions and the plurality of thick width portions are alternately arranged along a straight line, and are arranged to exceed the length of the H-type core of the power receiving device,
The primary coil is not wound around the plurality of thick portions, and the primary coil is wound around each of the plurality of narrow portions,
The power transmission device , wherein the coil selection unit selects the primary coil wound around one of the plurality of narrow portions and connects it to a power source . The power transmission device according to claim 1, wherein the number of the plurality of narrow portions is three or more . A power transmission device that has a core including a primary coil facing a core including a secondary coil of a power reception device mounted on a vehicle, and transmits power in a non-contact manner to the power reception device,
The core of the power receiving device is disposed so as to form a flat narrow portion around which the secondary coil is wound, and to form the narrow portion and an H shape at both ends of the narrow portion. And a winding axis of the secondary coil wound around the narrow portion of the H-type core, which is formed of a magnetic body having a thick portion where the secondary coil is not wound. Is mounted on the vehicle so that the
The power transmission device is:
A core formed of a magnetic material;
A plurality of primary coils wound around the core;
A coil selector that selects a part of the plurality of primary coils and connects to a power source;
With
The core of the power transmission device is:
Compared to the shape of the narrow portion of the power receiving device, the size of the vehicle in the front-rear direction is half, and a plurality of narrow portions arranged linearly in the front-rear direction of the vehicle ;
A plurality of wide width portions having a shape substantially equal to the wide width portion of the power receiving device, disposed at both end positions in the arrangement of the plurality of narrow width portions and at an intermediate position between the adjacent narrow width portions;
Have
The plurality of narrow width portions and the plurality of thick width portions are alternately arranged along a straight line, and are arranged to exceed the length of the H-type core of the power receiving device,
The primary coil is not wound around the plurality of thick portions, and the primary coil is wound around each of the plurality of narrow portions,
The power transmission device , wherein the coil selection unit selects the primary coil wound around two adjacent narrow width portions and connects to the power source . 4. The power transmission device according to claim 3, wherein the number of the plurality of narrow portions is six or more . A power receiving device that is mounted on a vehicle and has a core that includes a secondary coil that faces a core that includes a primary coil of a power transmitting device, and that receives power from the power transmitting device in a non-contact manner,
The core of the power transmission device is arranged so as to form a flat narrow portion around which the primary coil is wound, and the narrow portion and the H shape at both ends of the narrow portion, An H-shaped core formed of a magnetic material having a thick-width portion around which the primary coil is not wound, and a winding axis of the primary coil wound around the narrow-width portion of the H-shaped core is a vehicle It is installed on the ground side so that it faces in the front-rear direction,
The power receiving device is:
A core formed of a magnetic material;
A plurality of secondary coils wound around the core;
A coil selector that connects to a load using a selected subset of said plurality of secondary coils,
With
The core of the power receiving device is
A plurality of narrow portions having a shape substantially equal to the narrow portion of the power transmission device and arranged linearly in the front-rear direction of the vehicle ,
A plurality of wide portions having a shape substantially equal to the wide portion of the power transmission device, disposed at both end positions in the arrangement of the narrow portions and an intermediate position between the adjacent narrow portions;
Have
The plurality of narrow width portions and the plurality of thick width portions are alternately arranged along a straight line, and are disposed beyond the length of the H-shaped core of the power transmission device,
A secondary coil is not wound around the plurality of wide portions, and the secondary coil is wound around each of the plurality of narrow portions,
The power receiving device , wherein the coil selection unit selects the secondary coil wound around one of the plurality of narrow portions and connects it to a load . The power receiving device according to claim 5, wherein the number of the plurality of narrow portions is three or more . A power receiving device that is mounted on a vehicle and has a core that includes a secondary coil that faces a core that includes a primary coil of a power transmitting device, and that receives power from the power transmitting device in a non-contact manner,
The core of the power transmission device is arranged so as to form a flat narrow portion around which the primary coil is wound, and the narrow portion and the H shape at both ends of the narrow portion, An H-shaped core formed of a magnetic material having a thick-width portion around which the primary coil is not wound, and a winding axis of the primary coil wound around the narrow-width portion of the H-shaped core is a vehicle It is installed on the ground side so that it faces in the front-rear direction,
The power receiving device is:
A core formed of a magnetic material;
A plurality of secondary coils wound around the core;
A coil selection unit that selects a part of the plurality of secondary coils and connects to a load;
With
The core of the power receiving device is
Compared with the shape of the narrow portion of the power transmission device, the vehicle has a half size in the front-rear direction, and a plurality of narrow portions arranged linearly in the front-rear direction of the vehicle,
A plurality of wide portions having a shape substantially equal to the wide portion of the power transmission device, disposed at both end positions in the arrangement of the narrow portions and an intermediate position between the adjacent narrow portions;
Have
The plurality of narrow width portions and the plurality of thick width portions are alternately arranged along a straight line, and are disposed beyond the length of the H-shaped core of the power transmission device,
A secondary coil is not wound around the plurality of wide portions, and the secondary coil is wound around each of the plurality of narrow portions,
The power receiving device , wherein the coil selection unit selects and connects the secondary coil wound around two adjacent narrow width portions to a load . The power receiving device according to claim 7, wherein the number of the plurality of narrow portions is six or more .

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