JP6458466B2 - Coil unit - Google Patents

Description

  The present invention relates to a coil unit having a coil formed by winding a winding.

  2. Description of the Related Art Conventionally, a power transmission device provided on the ground side at a position where a vehicle stops and a power reception device provided on the vehicle and connected to an in-vehicle battery, wirelessly transmits power from the power transmission device to the power reception device on the vehicle side. There is known a power transmission system that transmits power by using (for example, see Patent Document 1). In this power transmission system, each of the power transmission device and the power reception device includes a spiral resonance coil, an electromagnetic induction coil, and a coil case made of, for example, resin that accommodates the resonance coil and the electromagnetic induction coil. A shield member is disposed along the bottom plate (top plate) in the coil case, and a core member is disposed on the shield member. And an electromagnetic induction coil and a resonance coil are arrange | positioned on the core member in a coil case, and each coil surrounding axis (winding axis) is extended in the up-down direction of a vehicle.

  Further, conventionally, a non-contact power feeding device for a mobile body that includes a power feeding unit provided along a traveling path of the mobile body and a power receiving unit provided on the mobile body, and performs power feeding with the power receiving unit facing the power receiving unit. Is known (see, for example, Patent Document 1). The power feeding unit and the power receiving unit of the non-contact power feeding device include an aluminum substrate, a ferrite plate-like core disposed on the substrate via an insulating member, and a recess formed on the surface of the plate-like core. And an oval coil (winding) to be accommodated. Moreover, the board | substrate of a electric power feeding part is attached to the traveling path etc. of a mobile body, and the board | substrate of a power receiving part is attached to the lower part of a mobile body. Further, a protective cover is attached to the power feeding unit and the substrate of the moving body so as to cover the plate-like core and the winding.

JP 2012-120411 A JP 2008-120239 A

  The shield member described in Patent Document 1 and the aluminum substrate described in Patent Document 2 each have a larger area than the coil and ferrite. However, according to the research and analysis by the present inventors, in a coil unit including such a shield member or the like, if a positional deviation occurs between the coil units (between the power transmission device and the power reception device), the power transmission efficiency Was found to be significantly reduced. Further, it has been found that when the positional deviation between the coil units occurs, the L value of the coil fluctuates significantly and the resonance frequency fluctuates.

  SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a coil unit that can satisfactorily suppress a reduction in power transmission efficiency and fluctuations in coil inductance.

  The coil unit according to the present invention is a coil unit having a coil formed by winding a winding, and a core member fixed to the coil so as to intersect a winding axis of the winding, and the core member And a shield member disposed on the opposite side of the coil, wherein at least a part of the peripheral edge portion of the shield member is located inside the peripheral edge portion of the core member.

  This coil unit is arranged on the opposite side of the coil with respect to the core member formed by winding the winding, the core member fixed to the coil so as to intersect the winding axis of the winding, and And a shield member. And in this coil unit, at least one part of the peripheral part of a shield member is located inside (winding shaft side) rather than the peripheral part of a core member. Thereby, in this coil unit, it becomes possible to suppress that the magnetic flux which goes in and out of a coil and a core member will be interrupted | blocked by a shield member. Therefore, the Q value (inductance) of the coil can be increased by increasing the magnetic flux, the fluctuation of the inductance of the coil can be reduced, and the coupling coefficient between the coils of other coil units can be increased. . As a result, it is possible to satisfactorily suppress a reduction in power transmission efficiency and fluctuations in coil inductance.

  In addition, the coil unit may be configured as a power receiving device that is mounted on a vehicle and receives power from a power transmitting device arranged outside the vehicle in a non-contact manner. Of these, the pair of peripheral edge portions extending in the vehicle width direction of the vehicle may be positioned inside the peripheral edge portion of the core member adjacent to each other. That is, the amount of deviation of the stop position of the vehicle relative to the power transmission device (position facing the power receiving device) is generally smaller in the front-rear direction of the vehicle than in the vehicle width direction of the vehicle. Therefore, in the power receiving device, by positioning the peripheral portion of the shield member extending in the vehicle width direction inside the peripheral portion of the core member adjacent to the shield member, the magnetic flux is shielded even if the stop position of the vehicle with respect to the power transmission device is displaced. It is possible to sufficiently ensure the magnetic flux from the power receiving device toward the power transmission device while being blocked by the member. As a result, the Q value (inductance) of the coil of the power receiving device is increased by increasing the magnetic flux, the fluctuation of the inductance of the coil is decreased, and the coupling coefficient between the power transmitting device and the power receiving device is increased. It becomes possible.

  Furthermore, in the power receiving device, a pair of peripheral portions extending in the front-rear direction of the vehicle among the peripheral portions of the shield member may be positioned outside the peripheral portions of the core member adjacent to each other. Accordingly, it is possible to satisfactorily suppress the temperature increase of the power receiving device due to the radiant heat from the vehicle side while sufficiently securing the magnetic flux flowing into the core member of the power receiving device.

  Further, in the power receiving device, a pair of peripheral portions extending in the front-rear direction of the vehicle among the peripheral portions of the shield member may be positioned inside the peripheral portions of the core member adjacent to each other. As described above, the amount of deviation of the stop position of the vehicle (opposite position of the power receiving device) with respect to the power transmission device is generally greater in the vehicle width direction than in the vehicle front-rear direction. Accordingly, in the power receiving device, the pair of peripheral edge portions of the shield member extending in the front-rear direction of the vehicle is positioned inside the peripheral edge portions of the core members adjacent to each other, so that the stop position of the vehicle relative to the power transmitting device (opposite the power receiving device). Even if the position is shifted, it is possible to suppress the magnetic flux from being blocked by the shield member and to increase the magnetic flux from the power receiving device toward the power transmitting device.

  Further, the coil unit may be configured as a power transmission device that supplies electric power from the coil to a power receiving device mounted on the vehicle in a contactless manner, and the vehicle width direction of the vehicle among the peripheral portions of the shield member. A pair of peripheral edge portions extending inward may be located inside the peripheral edge portions of the core member adjacent to each other. As a result, even if the stop position of the vehicle with respect to the power transmission device (position opposite to the power reception device) is deviated, the magnetic flux is prevented from being blocked by the shield member, and the magnetic flux flowing into the core member of the power transmission device is sufficiently secured. can do. As a result, the Q value (inductance) of the coil of the power transmission device is increased by increasing the magnetic flux, the variation of the inductance of the coil is decreased, and the coupling coefficient between the power transmission device and the power reception device is increased. It becomes possible.

  In the power transmission device, a pair of peripheral edges extending in the front-rear direction of the vehicle among the peripheral edges of the shield member may be located inside the peripheral edges of the core member adjacent to each other. . Thereby, even if the stop position of the vehicle (opposite position of the power receiving device) with respect to the power transmission device is shifted, more magnetic flux can be caused to flow into the core member of the power transmission device.

  Furthermore, in the power receiving device or the power transmission device, the distance between the peripheral edge portion extending in the front-rear direction of the shield member and the peripheral edge portion of the core member adjacent thereto is the peripheral edge extending in the vehicle width direction of the shield member. It may be longer than the distance between the portion and the peripheral portion of the core member adjacent to the portion. As a result, even if the stop position of the vehicle with respect to the power transmission device (the position where the power reception device faces) greatly deviates in the vehicle width direction, sufficient magnetic flux from the power reception device toward the power transmission device can be secured, or the core member of the power transmission device It is possible to ensure a sufficient amount of magnetic flux flowing in.

  The coil may be formed by winding the winding so as to have an air core portion, and the shield member may be disposed so as to cover the air core portion of the coil. Thereby, the magnetic flux which passed the air core part of a coil, and the magnetic flux which is going to pass the said air core part can be interrupted | blocked by a shield member. As a result, it is possible to satisfactorily prevent the eddy current caused by the magnetic flux that has passed through the air-core portion of the coil from flowing and the members around the coil from being heated to a high temperature.

It is a schematic block diagram of the electric power feeding system containing the coil unit by this invention. It is a fragmentary sectional view which shows the non-contact-type power receiving apparatus as a coil unit by this invention which comprises the electric power feeding system of FIG. It is a schematic block diagram which shows a non-contact-type power receiving apparatus. It is a schematic diagram which shows a non-contact-type power receiving apparatus. It is a fragmentary sectional view which shows the non-contact-type power transmission apparatus as a coil unit by this invention which comprises the electric power feeding system of FIG. It is a schematic diagram which shows a non-contact-type power transmission apparatus.

  Next, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a power feeding system 1 including a coil unit according to the present invention. A power feeding system 1 shown in FIG. 1 includes a non-contact type power receiving device (hereinafter simply referred to as “power receiving device”) 10 that is a coil unit mounted on a vehicle 100 that is a hybrid vehicle equipped with an engine EG, an electric motor MG, and a battery 200. And a non-contact power transmission device (hereinafter simply referred to as “power transmission device”) 20 that is a coil unit installed in a stop space of a vehicle such as a parking lot.

  As shown in FIGS. 1 and 2, the power receiving device 10 includes a winding type power receiving coil 11, a core member 110, a capacitor 12 that is connected in series to the power receiving coil 11 and forms a resonance circuit together with the power receiving coil 11, For example, a housing 15 made of resin or the like is housed. In the present embodiment, the power receiving coil 11 is a flat spiral coil formed by winding a winding, for example, in a square shape on the same plane, and has an air core portion 11c surrounded by the winding. However, the power receiving coil 11 may be formed by winding the winding in a circular shape or a rectangular shape on the same plane, and if the coil is relatively low in height, the winding is spiral. It may be a spiral coil formed by being wound around.

  In this embodiment, the core member 110 is composed of a plurality of members formed of a ferromagnetic material such as ferrite, and as shown in FIG. 2, for example, a flange-shaped flat plate portion 111 having a square planar shape (contour). And a hollow projecting portion 112 projecting from a substantially central portion of the flat plate portion 111 to one side (upper side in FIG. 2). In the present embodiment, the projecting portion 112 of the core member 110 is formed in a covered cylindrical shape, and is, for example, a rectangular and short (low profile) wall portion 113 and a flat top plate that closes the tip of the wall portion 113. Part 114. Further, the flat plate portion 111 of the core member 110 extends from the base end portion of the projecting portion 112 (wall portion 113) perpendicularly to the wall portion 113 and outward (in the radial direction). Furthermore, the power receiving coil 11 is fixed to the flat plate portion 111 of the core member 110 so as to surround the protruding portion 112.

  That is, the core member 110 is fixed to the power receiving coil 11 so that the flat plate portion 111 and the top plate portion 114 are orthogonal to (intersect) the winding axis of the winding. The protruding portion 112 of the core member 110 is inserted into the air core portion 11 c of the power receiving coil 11, and the winding of the power receiving coil 11 extends along the outer peripheral surface of the protruding portion 112 (wall portion 113). Further, the capacitor 12 is disposed in the protruding portion 112 of the core member 110, and the capacitor 12 is fixed to the back surface (upper surface in FIG. 2) of the top plate portion 114. In the present embodiment, the power receiving coil 11, the core member 110, and the capacitor 12 are assembled as a single assembly. However, the capacitor 12 may be separated from the assembly and fixed to the housing 15.

  The casing 15 of the power receiving device 10 includes a base member 151 and a cover 152, both of which are made of resin. The base member 151 is formed in a flat plate shape, and has, for example, a square planar shape (contour). The cover 152 includes a top plate portion 153 having a square planar shape (contour), a pair of side wall portions 154x extending along the peripheral edge portion of the top plate portion 153 so as to face each other, and orthogonal to the side wall portions 154x. Thus, it has a pair of side wall part 154y extended along the peripheral part of the top-plate part 153 (refer FIG. 3). The cover 152 is fixed to the base member 151 such that the end surfaces of the side wall portions 154x and 154y are in contact with the surface of the base member 151 (the upper surface in FIG. 2). As a result, the base member 151 and the cover 152 define a receiving space for the power receiving coil 11, the core member 110, the capacitor 12, and the like. In the present embodiment, the power receiving coil 11 and the core member 110 are accommodated in the housing 15 such that the longitudinal direction of the core member 110 extends in parallel with the longitudinal direction of the base member 151. The housing 15 may be molded with respect to the power receiving coil 11, the capacitor 12, and the like.

  As shown in FIG. 3, from each side wall part 154x of the cover 152, the attachment flange part 155 fixed to the floor panel 101 of the vehicle 100 is extended via the bolt which is not shown in figure. In the present embodiment, the power receiving device 10 includes a winding axis (a central axis of the air core portion 11c) of the power receiving coil 11 (winding wire) extending in the vertical direction of the vehicle 100 and a housing 15 (cover 152). The side wall portion 154x is attached to the floor panel 101 of the vehicle 100 such that the side wall portion 154x extends in parallel with the front-rear direction of the vehicle 100. The power receiving coil 11 is housed in the housing 15 so as to be closer to the road surface than the flat plate portion 111 of the core member 110.

  Furthermore, the power receiving apparatus 10 includes a shield member 17 attached to the vehicle 100 together with the housing 15 as shown in FIGS. 2 and 3. The shield member 17 is fixed to the floor panel 101 of the vehicle 100 via a bolt (not shown) together with the mounting flange portion 155 of the housing 15. As shown in FIG. 3, shield member 17 is located in the vertical direction of vehicle 100 between casing 15 and exhaust panel 102 through which exhaust gas from floor panel 101 and engine EG circulates. Accordingly, the shield member 17 is disposed on the opposite side of the power receiving coil 11 with respect to the core member 110.

  In the present embodiment, the shield member 17 is formed of a metal such as an aluminum alloy capable of interrupting AC magnetic flux so as to extend along the bottom of the vehicle 100, that is, along the floor panel 101 and not interfere (contact) with the exhaust pipe 102. Is done. In addition, a pair of protective members 18 are fixed to the floor panel 101 as shown in FIG. Each protection member 18 extends in the front-rear direction of vehicle 100 so as to cover each side wall 154x of housing 15 from the side. The power receiving device 10, that is, the power receiving coil 11 and the capacitor 12 in the housing 15 are connected to the battery 200 via a wire harness 19, a filter (not shown), a rectifier, a relay, and the like.

  As shown by a solid line in FIG. 4, in power reception device 10, the length of shield member 17 in the front-rear direction of vehicle 100, that is, the length of a pair of peripheral edge portions 17 x extending in the front-rear direction extends in the front-rear direction of vehicle 100. The length of the pair of side wall portions 154x of the casing 15 (cover 152) and the length of the pair of peripheral edge portions 111x of the core member 110 (flat plate portion 111) extending in the front-rear direction of the vehicle 100 are determined. On the other hand, the length of the shield member 17 in the vehicle width direction of the vehicle 100, that is, the width of the pair of peripheral edge portions 17y extending in the vehicle width direction is a housing extending in the front-rear direction of the vehicle 100 as shown in FIG. The length of the pair of side wall portions 154y of the body 15 and the length of the pair of peripheral edge portions 111y of the core member 110 extending in the vehicle width direction of the vehicle 100 are determined.

  The shield member 17 has a pair of peripheral edge portions 17y extending in the vehicle width direction of the vehicle 100 inside or protruding from the peripheral edge portion 111y extending in the vehicle width direction of the core member 110 (flat plate portion 111) adjacent to each other. It is attached to the floor panel 101 so as to be positioned on the 112 (winding axis of the power receiving coil 11) side. Further, when the shield member 17 is attached to the vehicle 100, the pair of peripheral edge portions 17x of the shield member 17 extending in the front-rear direction of the vehicle 100 extends in the front-rear direction of the core member 110 (flat plate portion 111) adjacent thereto. It is located on the outer side in the vehicle width direction with respect to the peripheral portion 111x and the side wall portion 154x extending in the front-rear direction of the casing 15 (cover 152). That is, when the shield member 17 is attached to the vehicle 100, each peripheral edge portion 17x of the shield member 17 protrudes more than the peripheral edge portion 111x of the core member 110 and the side wall portion 154x of the housing 15 which are close to each other. It is separated from the winding axis of the power receiving coil 11. Further, as can be seen from FIGS. 2 and 4, the air core portion 11 c of the power receiving coil 11 in the housing 15 is covered from above by the shield member 17.

  FIG. 5 is a partial cross-sectional view showing the power transmission device 20 constituting the power feeding system 1, and FIG. 6 is a schematic diagram showing the power transmission device 20. As shown in these drawings, the power transmission device 20 includes a power transmission coil 21, a core member 210, a capacitor 22 that is connected in series to the power transmission coil 21 and constitutes a resonance circuit together with the power transmission coil 21, AC power having a predetermined frequency ( A plurality of power devices 23 for supplying high-frequency power) to the power transmission coil, a communication antenna 24, an electronic control device (control circuit) 25, a housing 30 for housing them, and the like.

  The power transmission coil 21 is a flat spiral coil formed by winding a winding around a resin bobbin (not shown), for example, in a rectangular shape on the same plane, and an air core portion surrounded by the winding 21c. However, the power transmission coil 21 may be formed by winding a winding in a circular shape or a square shape on the same plane. If the winding is relatively low, the winding is spiral. It may be a spiral coil formed by being wound around. In the present embodiment, the lengths of the short side and the long side of the power transmission coil 21 are determined to be longer than the length of one side of the power receiving coil 11.

  In this embodiment, the core member 210 is composed of a plurality of members formed of a ferromagnetic material such as ferrite. As shown in FIG. 5, the core member 210 protrudes to one side (upper side in FIG. 5) from a flange-like flat plate portion 211 having, for example, a rectangular planar shape (contour), and a substantially central portion of the flat plate portion 211. And a hollow protrusion 212. In the present embodiment, the projecting portion 212 of the core member 210 is formed in a covered cylindrical shape, for example, a short (low-profile) and rectangular tubular wall portion 213 and a flat top plate that closes the tip of the wall portion 213. Part 214. Further, the flat plate portion 211 of the core member 210 extends from the base end portion of the protruding portion 212 (wall portion 213) perpendicularly to the wall portion 213 and outward (radially outward). Furthermore, the power receiving coil 11 is fixed to the flat plate portion 211 of the core member 110 so as to surround the protruding portion 212. That is, the core member 210 is fixed to the power transmission coil 21 so that the flat plate portion 211 and the top plate portion 214 are orthogonal to (intersect) the winding axis of the winding. Moreover, the protrusion part 212 of the core member 210 is inserted in the air core part 21c of the power transmission coil 21, and the winding of the power transmission coil 21 extends along the outer peripheral surface of the protrusion part 212 (wall part 213).

  The power equipment 23 includes a rectifier that converts power from an AC power source 40 as an external power source such as a household power source into DC power, an inverter that converts power from the rectifier into AC power (high frequency power), and a filter that removes high frequency noise. Etc. In this embodiment, the communication antenna 24 is configured as a coil antenna that enables wireless communication according to, for example, the WI-FI standard between the electronic control device 25 of the power transmission device 20 and the electronic control device of the vehicle 100. The electronic control device 25 controls a rectifier, an inverter, and the like while exchanging information with an electronic control device (not shown) of the vehicle 100 via the communication antenna 24.

  Further, as illustrated in FIG. 5, the housing 30 of the power transmission device 20 includes a base member 31 and a cover 32. The base member 31 is formed, for example, by casting a metal such as an aluminum alloy, and has a rectangular planar shape (contour). The cover 32 is formed of a resin (nonmagnetic material), and includes a top plate portion having a rectangular planar shape (contour) and a side wall portion extending along the peripheral edge portion of the top plate portion. The cover 32 is fixed to the base member 31 with a plurality of bolts or the like (not shown). For example, an unillustrated seal member (not shown) is disposed between the base member 31 and the end surface of the side wall of the cover 32. As a result, the housing 30 defines an accommodation space for the power transmission coil 21, the core member 210, the power device 23, the communication antenna 24, the electronic control device 25, and the like by the base member 31 and the cover 32. And in the accommodation space of the housing | casing 30, the shield member 33 supported by the base member 31 with the power transmission coil 21, the core member 210, etc. is arrange | positioned.

  The shield member 33 is formed by casting a metal (nonmagnetic conductive material) such as an aluminum alloy that can block the AC magnetic flux. As shown in FIG. 5, the shield member 33 includes, for example, a flange-shaped core support portion 331 having a rectangular planar shape (outline), and one side (upper side in FIG. 5) from the substantially central portion of the core support portion 331. It has a hollow projecting support portion 332 that projects, and a support wall portion 335 that extends from the peripheral edge portion of the core support portion 331 to the side opposite to the projecting direction of the projecting support portion 332 (the lower side in FIG. 5).

  In the present embodiment, the projecting support portion 332 of the shield member 33 is formed in a covered cylindrical shape that can be fitted into the projecting portion 212 of the core member 210, for example, a square tubular and short (low profile) wall portion 333. And a flat plate-shaped top plate portion 334 that closes the tip of the wall portion 333. The core support portion 331 of the shield member 33 is formed in a flat plate shape, and extends from the base end portion of the protruding support portion 332 (wall portion 333) to the wall portion 333 and outward (radially outward). To do. Furthermore, the support wall portion 335 is formed in, for example, a rectangular tube shape, and the area inside the contour line of the support wall portion 335 (core support portion 331) (projected area when viewed in plan) is the core member 210. It is determined to be smaller than the area inside the outline of the (flat plate portion 211).

  Prior to assembly to the base member 31, the core member 210 and the capacitor 22 that hold the power transmission coil 21 are fixed to the shield member 33 in advance. That is, the power transmission coil 21, the core member 210, the capacitor 22, and the shield member 33 are assembled as a single assembly prior to assembly to the base member 31. As shown in FIG. 5, the core member 210 is fixed to the shield member 33 so that the back surface of the flat plate portion 211 faces the front surface of the core support portion 331, and the protrusion 212 supports the protrusion of the shield member 33. A portion 332 is disposed. In the present embodiment, the back surface of the core member 210 (the lower surface in FIG. 5) is covered with an insulating member 215 such as a resin, and between the core member 210 and the shield member 33, as shown in FIG. The insulating member 215 is interposed.

  Accordingly, the flat plate portion 211 of the core member 210 is supported by the core support portion 331 of the shield member 33, and the protruding portion 212 of the core member 210 is supported by the protruding support portion 332 of the shield member 33. Further, as shown in FIG. 5, the capacitor 22 is disposed in the protruding support portion 332 of the shield member 33 and is fixed to the back surface (the lower surface in FIG. 5) of the top plate portion 334. Further, the capacitor 22 is electrically connected to the power transmission coil 21. As shown in FIG. 5, when the core member 210 is fixed to the shield member 33, the flat plate portion 211 of the core member 210 projects outward from the core support portion 331 of the shield member 33. That is, the peripheral edge portion of the core support portion 331 is located on the inner side in the extending direction of the flat plate portion 211 relative to the peripheral edge portion of the flat plate portion 211 of the core member 210, that is, the protruding support portion 332 (the winding axis of the power transmission coil 21). Located on the side). In addition, by interposing the insulating member 215 between the core member 210 and the shield member 33, the magnetic flux flowing through the core member 210 is prevented from flowing into the shield member 33, thereby suppressing the occurrence of eddy current loss. Can do.

  The shield member 33 integrated with the power transmission coil 21 and the core member 210 is fixed to the base member 31 so that the end surface of the support wall portion 335 contacts the surface of the base member 31. Is on the opposite side. In addition, the plurality of power devices 23, the electronic control device 25, and the like are each fixed to a predetermined position of the base member 31 via a bolt (not shown) and covered with the shield member 33. Furthermore, each electric power device 23 arranged between the base member 31 and the shield member 33 is electrically connected to corresponding elements such as the power transmission coil 21 and the capacitor 22 via a cable (wire harness).

  After the power transmission coil 21, the core member 210, the shield member 33, the power device 23, and the like are assembled to the base member 31, the cover 32 is fixed to the base member 31. The communication antenna 24 is accommodated in the housing 30 so as not to be covered by the shield member 33, and is electrically connected to the electronic control device 25 via a cable (not shown). As a result, electromagnetic waves from the communication antenna 24 are not blocked by the resin cover 32, so that information is exchanged well between the electronic control device 25 and the vehicle 100 side electronic control device via the communication antenna 24 (wirelessly). Communication).

  In the power transmission device 20, the longitudinal direction of the casing 30, the power transmission coil 21, and the core member 210 extends in parallel with the vehicle width direction of the vehicle 100 in the stop space, and the winding axis of the power transmission coil 21 is the vertical direction, The vehicle 100 is installed in the stop space so as to extend in the vertical direction. The power transmission coil 21 in the housing 30 is located above the flat plate portion 211 of the core member 210, that is, on the vehicle 100 side.

  As shown in FIG. 6, a pair of peripheral edge portions 331y of the shield member 33 (core support portion 331) extending in the vehicle width direction of the vehicle 100 in the stop space is the vehicle of the core member 210 (flat plate portion 211) adjacent to each other. It is located inside the peripheral edge 211y extending in the width direction, that is, on the protruding portion 212 (winding axis of the power transmission coil 21) side. Similarly, a pair of peripheral portions 331x of the shield member 33 (core support portion 331) extending in the front-rear direction of the vehicle 100 in the stop space are peripheral portions extending in the front-rear direction of the core member 210 (flat plate portion 211) adjacent to each other. It is located inside 211x, that is, on the protruding portion 212 (winding axis of the power transmission coil 21) side. Further, in the present embodiment, the distance La between the peripheral edge portion 331x extending in the front-rear direction of the shield member 33 and the peripheral edge portion 211x extending in the front-rear direction of the core member 210 adjacent thereto is equal to the vehicle width direction of the shield member 33. Is longer than the distance Lb between the peripheral edge portion 331y extending in the vehicle width direction and the peripheral edge portion 211y extending in the vehicle width direction of the core member 210 adjacent thereto. Furthermore, as can be seen from FIGS. 5 and 6, the air core 21 c of the power transmission coil 21 in the housing 30 is closed (covered) by the shield member 33 from below.

  When power is supplied to the vehicle 100 by the power feeding system 1 including the power receiving device 10 and the power transmitting device 20 as described above, the power is received with the power receiving coil 11 of the power receiving device 10 and the power transmitting coil 21 of the power transmitting device 20 facing each other. Electric power is supplied from the device 23 to the power transmission coil. Thereby, the magnetic flux from the power transmission device 20 flows into the power reception coil 11 of the power reception device 10 through the resin cover 32 of the housing 30 in the vertical direction of the vehicle 100, and electromagnetic induction (magnetic resonance) from the power transmission coil 21. ) To supply power in a non-contact manner. As a result, power can be supplied from the power receiving apparatus 10 to the battery 200 via a rectifier or the like, and the battery 200 can be charged with the power.

  Further, in the power transmission device 20 of the power feeding system 1, the power device 23 is disposed between the shield member 33 and the base member 31. Therefore, the shield member 33 (and the base member 31) blocks the magnetic flux that is about to flow into the electric power device 23 and promotes the inflow of the magnetic flux (the magnetic flux from the power receiving coil 11) to the core member 210 (flat plate portion 211). It is possible to satisfactorily suppress the temperature rise of the electric power device 23 due to the flow of the eddy current due to the magnetic flux. In addition, by disposing the power device 23 between the shield member 33 and the base member 31, it is possible to satisfactorily suppress noise (high-frequency noise) generated in the power device 23 from leaking to the outside of the housing 30. Is also possible.

  Further, in the power transmission device 20 of the power feeding system 1, the pair of peripheral portions 331 y of the shield member 33 extending in the vehicle width direction of the vehicle 100 in the stop space is positioned on the inner side of the peripheral portion 211 y of the core member 210 adjacent to each other. . That is, the amount of deviation of the stopping position of the vehicle 100 with respect to the power transmission device 20 (the position opposite to the power receiving device 10) is generally greater than that of the vehicle 100 as compared with the vehicle width direction of the vehicle 100 by providing a stop in the stopping space. Smaller in direction. Therefore, in the power transmission device 20, the stop position of the vehicle 100 with respect to the power transmission device 20 is determined by positioning the peripheral edge portion 331y extending in the vehicle width direction of the shield member 33 inside the peripheral edge portion 211y of the core member 210 adjacent thereto. Even if the deviation occurs, the magnetic flux is prevented from being blocked by the shield member 33, and the magnetic flux flowing into the core member 210 of the power transmission device 20 from the power reception device 10 side can be sufficiently secured.

  In the power transmission device 20 of the power feeding system 1, the pair of peripheral portions 331 x of the shield member 33 extending in the front-rear direction of the vehicle 100 in the stop space is located on the inner side of the peripheral portion 211 x of the core member 210 adjacent to each other. Further, a distance La between the peripheral edge portion 331x extending in the front-rear direction of the shield member 33 and the peripheral edge portion 211x of the core member 210 adjacent thereto is close to the peripheral edge portion 331y extending in the vehicle width direction of the shield member 33. It is determined to be longer than the distance Lb from the peripheral edge 211y of the core member 210. Thereby, even if the stop position of the vehicle 100 with respect to the power transmission device 20 (the position where the power reception device 10 is opposed) greatly deviates in the vehicle width direction, the magnetic flux is prevented from being blocked by the shield member 33, and the power reception device 10 side. Therefore, the magnetic flux flowing into the core member 210 of the power transmission device 20 can be ensured satisfactorily. As a result, the Q value (inductance) of the power transmission coil 21 of the power transmission device 20 is further increased by increasing the magnetic flux, the variation in inductance of the power transmission coil 21 is further decreased, and between the power transmission device 20 and the power reception device 10. It is possible to further increase the coupling coefficient K.

  In addition, in the power transmission device 20 of the power feeding system 1, the shield member 33 is arranged so as to block (cover) the air core portion 21 c of the power transmission coil 21 from below, so that it will pass through the air core portion 21 c of the power transmission coil 21. Can be interrupted by the shield member 33. As a result, it is possible to satisfactorily suppress the temperature of the members arranged around the air core portion 21c of the power transmission coil 21 from flowing due to the eddy current caused by the magnetic flux that has passed through the air core portion 21c of the power transmission coil 21. It becomes possible.

  Further, in the power receiving device 10 of the power feeding system 1, the pair of peripheral edge portions 17 y of the shield member 17 extending in the vehicle width direction of the vehicle 100 are peripheral edges extending in the vehicle width direction of the core member 110 (the flat plate portion 111) adjacent thereto. It is located inside the portion 111y. As described above, the amount of deviation of the stop position of the vehicle 100 with respect to the power transmission device 20 (the position where the power reception device 10 faces) is generally smaller in the front-rear direction of the vehicle 100 than in the vehicle width direction. Therefore, in the power receiving device 10, the stop position of the vehicle 100 with respect to the power transmission device 20 is set by positioning the peripheral edge portion 17 y extending in the vehicle width direction of the shield member 17 inside the peripheral edge portion 111 y of the core member 110 adjacent thereto. Even if the deviation occurs, the magnetic flux is prevented from being blocked by the shield member 17, and the magnetic flux from the power receiving device 10 toward the power transmitting device 20 can be sufficiently secured. As a result, the Q value (inductance) of the power receiving coil 11 of the power receiving device 10 is further increased by increasing the magnetic flux, the variation in the inductance of the power receiving coil 11 is further reduced, and the power transmission device 20 and the power receiving device 10 are It is possible to further increase the coupling coefficient K.

  Further, in the power receiving device 10 of the power feeding system 1, since the shield member 17 is arranged so as to cover the air core portion 11 c of the power receiving coil 11 from above, the magnetic flux that has passed through the air core portion 11 c of the power receiving coil 11 is shielded. It can be blocked by 17. As a result, the eddy current due to the magnetic flux that has passed through the air core portion 11c of the power receiving coil 11 flows, so that the floor panel 101 and the exhaust pipe 102 disposed around the power receiving coil 11 are heated or the floor panel 101 is heated. Thus, for example, it is possible to satisfactorily suppress the temperature rise of resin members (not shown) such as various floor covers and wire harness clamps.

  Further, in the power receiving device 10 of the power feeding system 1, the pair of peripheral edge portions 17 x of the shield member 17 extending in the front-rear direction of the vehicle 100 is the peripheral edge portion 111 x extending in the front-rear direction of the core member 110 (flat plate portion 111) adjacent thereto. It is located outside in the vehicle width direction. Therefore, when exhaust gas flows through the exhaust pipe 102 in accordance with the operation of the engine EG of the vehicle 100, it is possible to satisfactorily suppress the temperature increase of the power receiving device 10 due to radiant heat released from the vehicle 100 side, that is, the exhaust pipe 102. It becomes possible.

  As described above, the power receiving device 10 as the coil unit is configured so that the power receiving coil 11 formed by winding the winding, the flat plate portion 111, and the like are orthogonal to (intersect) the winding axis of the winding. A core member 110 fixed to the power receiving coil 11 and a shield member 17 disposed on the opposite side of the core member 110 from the power receiving coil 11 are included. And a pair of peripheral part 17y extended in the vehicle width direction of the vehicle 100 among the peripheral parts of the shield member 17 is more than the peripheral part 111y extended in the said vehicle width direction of the core member 110 (flat plate part 111) which adjoins each. Located on the inside (winding shaft side). Thereby, in the power receiving device 10, it is possible to suppress the magnetic flux from the power receiving coil 11 and the core member 110 from being blocked by the shield member 17. Therefore, the increase in the magnetic flux increases the Q value (inductance) of the power receiving coil 11, reduces the variation in inductance of the power receiving coil 11, and sets the coupling coefficient K between the power transmitting device 20 and the power transmitting coil 21. Can be higher. As a result, it is possible to satisfactorily suppress a reduction in power transmission efficiency and a change in inductance of the power receiving coil 11.

  Further, the power transmission device 20 as a coil unit includes a power transmission coil 21 formed by winding a winding, and the power transmission coil 21 so that the core support portion 331 and the like are orthogonal to (intersect) the winding axis of the winding. And a shield member 33 disposed on the opposite side of the power transmission coil 21 with respect to the core member 210. In the power transmission device 20, the peripheral portions 331 x and 331 y of the shield member 33 are located on the inner side (winding shaft side) than the peripheral portions 211 x and 211 y of the core member 210. Thereby, it can suppress that the magnetic flux which is going to flow into the core member 210 is interrupted by the shield member 33. Accordingly, a large amount of magnetic flux flows into the core member 210 to increase the Q value (inductance) of the power transmission coil 21, to further reduce the variation in inductance of the power transmission coil 21, and to the power reception coil 11 of the power reception device 10. It is possible to further increase the coupling coefficient K between the two.

  Furthermore, in the vehicle 100 on which the engine EG is mounted, the vehicle width is larger than the peripheral portion 111x of the core member 110 adjacent to the pair of peripheral portions 17x of the shield member 17 extending in the front-rear direction of the vehicle 100 as in the above embodiment. By being positioned outside in the direction, it is possible to satisfactorily suppress the temperature increase of the power receiving device 10 due to the radiant heat emitted from the exhaust pipe 102 as described above. However, for example, when the power receiving apparatus 10 is mounted on an electric vehicle or the like that does not need to consider radiant heat from the exhaust pipe, the shield member 17 extends in the front-rear direction of the vehicle as indicated by a two-dot chain line in FIG. The pair of peripheral edge portions 17x may be configured to be located inside the peripheral edge portion 111x of the core member 110 adjacent to each other. Thereby, even if the stop position of the vehicle with respect to the power transmission device 20 (a position where the power reception device 10 is opposed) is displaced, it is possible to increase the magnetic flux from the power reception device 10 toward the power transmission device 20. In this case, as shown in FIG. 4, the distance la between the peripheral edge portion 17x extending in the front-rear direction of the shield member 17 and the peripheral edge portion 111x of the core member 110 adjacent thereto is set as the vehicle of the shield member 17. It may be longer than the distance lb between the peripheral edge portion 17y extending in the width direction and the peripheral edge portion 111y of the core member 110 proximate to the peripheral edge portion 17y.

  According to the verification by the present inventor, the pair of peripheral edge portions 17y of the shield member 17 extending in the vehicle width direction of the vehicle 100 is located inside the peripheral edge portion 111y extending in the vehicle width direction of the core member 110 adjacent thereto. It has been confirmed that the Q value (inductance), the variation in inductance, and the coupling coefficient K of the power receiving coil 11 can be improved practically simply by being positioned on the (winding shaft side).

  That is, the air core 11c of the power receiving coil 11 is covered with the shield member 17, and each peripheral edge 17y of the shield member 17 is, for example, 10 mm or more inward (winding shaft side) from the peripheral edge 111y of the core member 110 adjacent thereto. When positioned, the fluctuation of the inductance of the power receiving coil 11 is reduced to about 40% when the respective peripheral edge portions 17y of the shield member 17 are not brought closer to the inner side than the peripheral edge portion 111y of the core member 110 adjacent thereto. Further, the minimum value of the K value increases to about 1.1 times the case where the respective peripheral edge portions 17y of the shield member 17 are not brought closer to the inner side than the peripheral edge portion 111y of the core member 110 adjacent thereto, and the maximum value of the K value. Increases by about 1.7 to 1.8 times when the peripheral edge portion 17y of the shield member 17 is not moved inward from the peripheral edge portion 111y of the core member 110 adjacent thereto. Further, the minimum value of the Q value of the power receiving coil 11 when the K value is the minimum is 1. When the peripheral edge portion 17y of the shield member 17 is not brought closer to the inner side than the peripheral edge portion 111y of the core member 110 adjacent thereto. The maximum value of the Q value of the power receiving coil 11 when the K value is maximum is increased by about 2 to 1.3 times from the peripheral edge 111y of the core member 110 adjacent to each peripheral edge 17y of the shield member 17. Increases to about 1.1 times that of the case where it is not moved inward. Therefore, in the power transmission device 20, the peripheral edge portions 331 x and 331 y of the shield member 33 do not necessarily need to be positioned inside the peripheral edge portions 211 x and 211 y of the core member 210.

  Further, the power transmission device 20 may be provided with a radiator having a plurality of radiating fins, for example, so as to contact the casing 30, or a plurality of radiating fins may be disposed on the casing 30 or the cover 32. . Thereby, it is possible to satisfactorily cool the power equipment 23 such as a rectifier, an inverter, and a filter that generate heat during power transmission from the power transmission device 20 to the power reception device 10.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment at all, and it cannot be overemphasized that various changes can be made within the range of the extension of this invention. Furthermore, the mode for carrying out the invention described above is merely a specific embodiment of the invention described in the column for solving the problem, and is described in the column for means for solving the problem. It is not intended to limit the elements of the invention.

  The present invention can be used in the manufacturing industry of coil units and non-contact power supply systems.

  DESCRIPTION OF SYMBOLS 1 Power supply system, 10 Non-contact-type power receiving device, 11 Power receiving coil, 11c Air core part, 12 Capacitor, 15 Case, 17 Shield member, 17x, 17y Peripheral part, 18 Protection member, 19 Wire harness, 20 Non-contact power transmission Device, 21 Power transmission coil, 21c Air core, 22 Capacitor, 23 Power device, 24 Communication antenna, 25 Electronic control device, 30 Housing, 31 Base member, 32 Cover, 33 Shield member, 40 AC power supply, 100 Vehicle, 101 Floor panel, 102 exhaust pipe, 110 core member, 111 flat plate part, 111x, 111y peripheral edge part, 112 projecting part, 113 wall part, 114 top plate part, 151 base member, 152 cover, 153 top plate part, 154x, 154y side wall Part, 155 mounting flange part, 200 battery, 210 Core member, 211 flat plate part, 211x, 211y peripheral part, 212 projecting part, 213 wall part, 214 top plate part, 215 insulating member, 331 core support part, 331x, 331y peripheral part, 332 projecting support part, 333 wall part, 334 Top plate part, 335 Support wall part, EG engine, MG electric motor.

Claims (7)

A coil unit having a coil formed by winding a winding, mounted on a vehicle, and configured to receive power from a power transmission device arranged outside the vehicle in a contactless manner In
A core member fixed to the coil so as to intersect the winding axis of the winding;
A shield member disposed on the opposite side of the coil with respect to the core member,
Of the peripheral portions of the shield member, a pair of peripheral portions extending in the vehicle width direction of the vehicle are located on the inner side of the peripheral portions of the core member adjacent to each other. The coil unit according to claim 1,
Of the peripheral portions of the shield member, a pair of peripheral portions extending in the front-rear direction of the vehicle are located outside the peripheral portions of the core member adjacent to each other. The coil unit according to claim 1,
Of the peripheral portions of the shield member, a pair of peripheral portions extending in the front-rear direction of the vehicle are located on the inner side of the peripheral portion of the core member adjacent to each other. In a coil unit having a coil formed by winding a winding and configured as a power transmission device that supplies power from the coil to a power receiving device mounted on a vehicle in a contactless manner,
A core member fixed to the coil so as to intersect the winding axis of the winding;
A shield member disposed on the opposite side of the coil with respect to the core member,
Of the peripheral portions of the shield member, a pair of peripheral portions extending in the vehicle width direction of the vehicle are located on the inner side of the peripheral portions of the core member adjacent to each other. In the coil unit according to claim 4,
A coil unit characterized in that, of the peripheral portions of the shield member, a pair of peripheral portions extending in the front-rear direction of the vehicle are positioned inside the peripheral portions of the core member adjacent to each other. In the coil unit according to claim 5 ,
Said peripheral portion extending in the longitudinal direction of the shield member, said core member the distance between the periphery of the core member, said peripheral portion extending in the vehicle width direction of the shield member, in proximity to its adjacent thereto A coil unit characterized in that it is longer than the distance to the peripheral edge. In the coil unit according to any one of claims 1 to 6,
The coil is formed by winding the winding so as to have an air core part,
The said shield member is arrange | positioned so that the said air core part of the said coil may be covered, The coil unit characterized by the above-mentioned.

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