JP6003565B2 - Non-contact power feeding device - Google Patents

Description

  The present invention relates to a non-contact power feeding device including a primary coil for power transmission and a secondary coil for power reception.

  As this type of device, as seen in Patent Document 1 below, the side of the primary coil opposite to the side facing the secondary coil, and the side of the secondary coil facing the primary side coil Also proposed is a conductive plate made of aluminum in close contact with each of the opposite sides. Thereby, the electromagnetic field which leaks outside from these coils at the time of non-contact electric power feeding between a primary side coil and a secondary side coil can be reduced.

JP 2010-172084 A

  Here, according to the apparatus described in Patent Document 1, although the leakage electromagnetic field near the side opposite to the coil side of the surface of the conductive plate can be reduced, the coil side of the surface of the conductive plate can be reduced. There is a concern that the effect of reducing the leakage electromagnetic field in places other than the vicinity of the opposite side cannot be obtained. In addition, there is a concern that the effect of reducing the leakage electromagnetic field may be reduced near the outer peripheral portion of the conductive plate or the leakage electromagnetic field may be increased by eddy current flowing at the end of the conductive plate during non-contact power feeding.

  The present invention has been made to solve the above-described problems, and a purpose thereof is a new non-contact power feeding apparatus that can reduce electromagnetic fields leaking from the primary side coil and the secondary side coil to the outside. Is to provide.

In order to solve the above problems, the present invention relates to a primary coil for power transmission (22), a secondary coil for power reception (42), and the primary coil when non-contact power feeding is performed. Main shield members (23, 43, 23a, 43a, 72a, 74a, 23c, 43e to 43j) made of a ferromagnetic material having a relative permeability higher than 1 at the frequency of the applied voltage. The shield member guides a magnetic flux from one to the other of the magnetic pole portions corresponding to at least one of the primary side coil and the secondary side coil, and the primary side coil and the secondary side The main shield member is further arranged in a flat shape, and the primary coil and the secondary coil are arranged in a direction in which the primary coil and the secondary coil face each other. Side coil Characterized in that it is disposed in close proximity to the respectively.

  The relative permeability of the ferromagnetic material is sufficiently higher than the relative permeability of the surrounding atmosphere and road surface (asphalt), for example. For this reason, in the said invention, the electromagnetic field which leaks outside from a primary side coil and a secondary side coil can be reduced suitably.

  Here, when the shield member is arranged in contact with the primary side coil or the secondary side coil, although the effect of reducing the leakage electromagnetic field is increased, the primary side coil and the secondary side coil are caused by a short circuit of the magnetic flux. The leakage inductance between the coils increases, and the coupling coefficient between these coils decreases. Thereby, the power transmission efficiency from a primary side coil to a secondary side coil falls. On the other hand, in the said invention, the main shield member is spaced apart and each arrange | positioned from the primary side coil and the secondary side coil. For this reason, it is possible to suppress a decrease in the coupling coefficient between the coils while suppressing an increase in leakage inductance between the primary side coil and the secondary side coil. Thereby, the fall of the power transmission efficiency from the primary side coil side to the secondary side coil side can be suppressed suitably. Furthermore, the main shield member is flattened, and the main shield member is disposed close to each of these coils in the direction in which the primary side coil and the secondary side coil face each other, whereby the main shield member is arranged as described above. An increase in the size of the non-contact power feeding device in the facing direction can also be suppressed.

The lineblock diagram of the non-contact electric supply system concerning a 1st embodiment. The perspective view of the power transmission pad and power receiving pad concerning the embodiment. The top view of the non-contact electric power feeder concerning the embodiment. Sectional drawing of the non-contact electric power feeder concerning the embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The figure which shows the effect of the main shield member concerning the embodiment. The top view of the non-contact electric power supply concerning 2nd Embodiment. Sectional drawing of the non-contact electric power feeder concerning the embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The figure which shows the effect of the main shield member concerning the embodiment. Sectional drawing of the non-contact electric power feeder concerning a comparison technique. Sectional drawing of the non-contact electric power feeder concerning 3rd Embodiment. The top view of the non-contact electric power supply concerning 4th Embodiment. Sectional drawing of the non-contact electric power feeder concerning the embodiment. Sectional drawing of the non-contact electric power feeder concerning the embodiment. The top view of the non-contact electric power supply concerning 5th Embodiment. Sectional drawing of the non-contact electric power feeder concerning the embodiment. The layout of the non-contact electric supply device to the parking space concerning a 6th embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The layout of the non-contact electric supply device to the parking space concerning a 7th embodiment. The layout of the non-contact electric power feeder to the parking space concerning the embodiment. The layout of the non-contact electric supply device to the parking space concerning an 8th embodiment. The layout of the non-contact electric power feeder to the floor surface outer side of the vehicle concerning the embodiment. The top view of the non-contact electric power supply concerning other embodiment. The top view of the non-contact electric power supply concerning other embodiment. Sectional drawing of the non-contact electric power feeder concerning other embodiment. Sectional drawing of the non-contact electric power feeder concerning other embodiment. The layout of the non-contact electric power feeder to the parking space concerning other embodiments. Sectional drawing of the core concerning other embodiment. Sectional drawing of the core concerning other embodiment.

(First embodiment)
Hereinafter, a first embodiment in which a contactless power supply device according to the present invention is applied to a contactless power supply system of a vehicle (hybrid vehicle or electric vehicle) including a rotating machine as an in-vehicle main unit will be described with reference to the drawings.

  As shown in FIG. 1, the non-contact power feeding system includes a power transmission system provided outside the vehicle 10 and a power receiving system provided in the vehicle 10.

  The power transmission system includes a power transmission pad 20 as a power transmission member and a power transmission circuit 30. Specifically, the power transmission circuit 30 converts a frequency of an AC power supply 32 (system power supply) provided outside the vehicle 10 into a predetermined high frequency (several kHz to several tens of MHz) (for example, a full bridge circuit). And a resonance circuit that supplies the power output from the power conversion circuit to the power transmission pad 20.

  The power transmission pad 20 includes a primary side core and a primary side coil wound around the primary side core, and is a member for sending electric power to the power reception pad 40 included in the power reception system by electromagnetic induction. The configuration of the power transmission pad 20 will be described in detail later.

  On the other hand, the power receiving system includes a power receiving pad 40 as a power receiving member, a power receiving circuit 50, a DCDC converter 52, a main battery 54 as a power storage means, and a control device 56. Specifically, the power receiving pad 40 includes a secondary side core and a secondary side coil wound around the secondary side core, and is a member for receiving power transmitted from the power transmitting pad 20. The power receiving pad 40 is disposed in the lower part of the vehicle 10 (outside the floor surface). The configuration of the power receiving pad 40 will be described in detail later.

  The power received by the power receiving pad 40 is supplied to the power receiving circuit 50. The power receiving circuit 50 includes a resonant circuit to which the power received by the power receiving pad 40 is input, a rectifier circuit that converts a high-frequency alternating current output from the resonant circuit into a direct current, and an output voltage of the rectifier circuit that is predetermined. A power conversion circuit for converting and applying to the main battery 54. The output voltage of the power receiving circuit 50 and the main battery 54 is stepped down by the DCDC converter 52 and applied to the in-vehicle auxiliary machine 58 and the auxiliary battery 60.

  The main battery 54 has a terminal voltage of, for example, 100 V or more, and is specifically a nickel metal hydride secondary battery or a lithium ion secondary battery. The auxiliary battery 60 has a terminal voltage sufficiently lower than the terminal voltage of the main battery 54, and is specifically a lead storage battery, for example. In addition to the power receiving system, the vehicle 10 includes an inverter 62 that converts the DC power of the main battery 54 into AC power and outputs it, and a motor generator as an in-vehicle main unit that is rotationally driven by the AC power output from the inverter 62. 64 is provided.

  The control device 56 operates the inverter 62 to perform drive control of the motor generator 64, and operates the DCDC converter 52 to supply power to the in-vehicle auxiliary machine 58 and the auxiliary battery 60. In addition, the control device 56 instructs the power receiving circuit 50 to execute a charging process with the vehicle as a power supply target. As a result, the power receiving circuit 50 operates to charge the vehicle 10 while exchanging information between the circuits using the wireless communication interfaces provided in each of the power receiving circuit 50 and the power transmitting circuit 30.

  Next, a non-contact power feeding device including the power transmission pad 20 and the power receiving pad 40 according to the present embodiment will be described in detail with reference to FIGS.

  In FIG. 2, the perspective view of the power transmission pad 20 and the power receiving pad 40 among non-contact electric power feeders is shown.

  As illustrated, the power transmission pad 20 includes a primary side core 21 and a primary side coil 22 wound around the primary side core 21. Specifically, the primary side core 21 has a rectangular plate shape and a pair of primary side winding portions 21a that are separated from each other, and a rectangular plate-like primary side that connects the primary side winding portions 21a to each other. This is a member formed integrally with the connecting portion 21b. Each of the pair of primary winding parts 21a has a plate surface (plane) and a peripheral edge part 21c. The primary side connecting portion 21b is connected to the opposite side of the pair of plate surfaces of each of the primary side winding portions 21a to the power receiving pad 40 side. Further, a plurality of primary side coils 22 are wound around each peripheral edge portion 21c of the primary side winding portion 21a. In the present embodiment, the primary core 21 is made of a soft magnetic material, specifically, ferrite.

  On the other hand, the power receiving pad 40 includes a secondary side core 41 and a secondary side coil 42 wound around the secondary side core 41. Specifically, the secondary side core 41 has a rectangular plate shape and a pair of secondary winding portions 41a that are spaced apart from each other, and a rectangular plate-like secondary side that connects the secondary winding portions 41a to each other. This is a member formed integrally with the connecting portion 41b. Each of the pair of secondary winding parts 41a has a plate surface (plane) and a peripheral edge part 41c. The secondary side connecting portion 41b is connected to the opposite side of the pair of plate surfaces of the secondary side winding portion 41a from the power transmission pad 20 side. In addition, a plurality of secondary side coils 42 are wound around each peripheral edge portion 41c of the secondary side winding portion 41a. In the present embodiment, the secondary side core 41 is made of ferrite in the same manner as the primary side core 21.

  When the non-contact power feeding is performed, the primary side core 21 and the secondary side core 41 are parallel so that the plate surface of the primary side winding portion 21a and the plate surface of the secondary side winding portion 41a face each other. It is arranged to become.

  Incidentally, in the present embodiment, the pair of primary windings 21 a corresponds to the pair of magnetic poles corresponding to the primary coil 22, and the pair of secondary windings 41 a serves as the secondary coil 42. This corresponds to the corresponding magnetic pole part. Further, in FIG. 2, the flow direction of the current I1 flowing through the primary coil 22 and the flow direction of the current I2 flowing through the secondary coil 42 are indicated by arrows.

  Next, a characteristic configuration of the contactless power supply device according to the present embodiment will be described.

  First, a characteristic configuration on the power receiving pad 40 side will be described with reference to FIG. FIG. 3 is a view of the power receiving pad 40 as viewed from the front side of the plate surface of the secondary winding portion 41a. In FIG. 3, the portion of the secondary coil 42 that extends from the secondary core 41 side to the outside is not shown. Further, in FIG. 3, although not a cross-sectional shape, the constituent members of the secondary side core 41 and the secondary side coil 42 are hatched.

  As illustrated, in the present embodiment, the secondary main shield member 43 is disposed so as to surround the secondary core 41 and the secondary coil 42 in a front view of the plate surface of the secondary winding portion 41a. Has been. Specifically, the secondary main shield member 43 has a rectangular frame shape (rectangular frame shape) in a front view of the plate surface of the secondary winding portion 41a and is close to the secondary core 41 and the secondary coil 42. It is spaced apart and arranged outside the floor of the vehicle 10. In the present embodiment, the secondary main shield member 43 is made of a soft magnetic material, and specifically, for example, ferrite, a dust core, a dust core, or an iron-based material having a predetermined thickness (eg, 0.3 mm) or less. Made of soft magnetic material. Here, examples of the iron-based soft magnetic material include an electromagnetic steel plate (silicon steel plate), permalloy, an amorphous metal material, and a nanocrystalline soft magnetic material. By forming the secondary side main shield member 43 with such a material, in the use frequency band of the non-contact power feeding (the frequency of the voltage applied to the primary side coil 22, for example, several kHz to several tens MHz). The relative permeability can be made sufficiently high.

  As shown in FIG. 4, the secondary side main shield member 43 has a flat shape, and passes through the plane on the opposite side of the surface of the secondary side connecting portion 41 b from the power transmission pad 20 side and on this plane. Arranged on parallel surfaces. 4 is a cross-sectional view taken along the line AA in FIG. Here, in FIG. 4, illustration of the outside of the floor surface of the vehicle 10 is omitted.

  On the other hand, the primary side main shield member 23 is also provided on the power transmission pad 20 side, similarly to the power reception pad 40 side. Specifically, as shown in FIG. 5, the power receiving pad 40 including the secondary side core 41 and the secondary side coil 42 and the secondary side main shield member 43 are disposed outside the floor surface of the vehicle 10, The power transmission pad 20 including the primary side core 21 and the primary side coil 22 and the primary side main shield member 23 are arranged on the power supply facility side provided in the parking space. The primary side main shield member 23 has the same configuration as the secondary side main shield member 43. The positional relationship between the primary side main shield member 23 and the power transmission pad 20 is the same as the positional relationship between the secondary side main shield member 43 and the power receiving pad 40 shown in FIGS. 3 and 4.

  The power transmission pad 20 is fixed on the road surface of the parking space, and the primary side main shield member 23 is embedded in the parking space. Here, examples of the power supply equipment include those provided in a parking space of a building, a paid parking space such as a coin parking, and a parking space of a store such as a supermarket.

  In FIG. 5, the wheel of the vehicle 10 is indicated by “70”, the wheel stopper of the vehicle 10 is indicated by “72”, and the illustration of the secondary main shield member 43 is omitted. FIG. 6 shows a view of the parking space of FIG. In FIG. 6, the outlines of the vehicle 10 and the wheels 70 are indicated by broken lines, and a line that partitions the parking space is indicated by “74”.

  Then, the effect by arrange | positioning the primary side main shield member 23 and the secondary side main shield member 43 is demonstrated using FIG. Here, FIG. 7 is a cross-sectional view of the power transmitting pad 20 and the power receiving pad 40, and corresponds to FIG.

  When a high frequency current flows through the primary side coil 22, a magnetic field is generated inside the primary side coil 22, so that one of the pair of primary side winding portions 21a is shown as indicated by the broken arrow in the figure. Magnetic flux flows from the plate surface side to the plate surface side of the secondary side winding portion 41a facing this, and an induced current flows through the secondary coil 42. For this reason, a magnetic field is generated inside the secondary coil 42, and a magnetic flux is generated from the other plate surface side of the pair of secondary winding portions 41a to the plate surface side of the primary winding portion 21a opposed to the other. Inflow. Thereby, the main magnetic flux which circulates between the primary side core 21 and the secondary side core 41 will be formed.

  Here, the magnetic flux going from one plate surface of the primary side winding portion 21a to the outside is guided to the other plate surface of the primary side winding portion 21a via the primary side main shield member 23. In addition, the magnetic flux going from one plate surface of the secondary side winding portion 41a to the outside passes through the secondary side main shield member 43 to the other side of the secondary side winding portion 41a on the plate surface. Led. That is, the leakage electromagnetic field to the outside can be reduced.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) The primary-side main shield member 23 and the secondary-side main shield member 43 are provided in the non-contact power feeding device. For this reason, leakage electromagnetic fields can be reduced, and malfunctions and malfunctions of peripheral electronic devices (for example, communication devices) can be avoided. In particular, in this embodiment, the primary side main shield member 23 and the secondary side main shield member 43 are separated from the primary side core 21, the secondary side core 41, the primary side coil 22, and the secondary side coil 42. . For this reason, it is possible to suppress a decrease in the coupling coefficient between the coils 22 and 42 while suppressing an increase in leakage inductance between the primary coil 22 and the secondary coil 42. Thereby, the increase in the energization amount to the primary side coil 22 required in order to supply predetermined electric power from the power transmission pad 20 side to the power receiving pad 40 side can be suppressed, and the reduction in power transmission efficiency can be suppressed. It can suppress suitably.

  In addition, in this embodiment, the primary side core 21 and the primary side coil 22, and the secondary side cores 41 and 2 in the front view of the plate surface of the primary side winding part 21a and the secondary side winding part 41a. The primary side main shield member 23 and the secondary side main shield member 43 are arranged so as to form a flat frame shape surrounding the secondary coil 42. For this reason, the effect of reducing the leakage electromagnetic field can be further increased. Further, the primary side main shield member 23 and the secondary side main shield member 43 are arranged in the direction in which the primary side coil 22 and the secondary side coil 42 face each other (the primary side winding portion 21a and the secondary side winding portion 41a. In the direction orthogonal to the plate surface of the primary coil 22 and the secondary coil 42. For this reason, it is possible to suppress an increase in the physique in the height direction of the non-contact power feeding device (the opposing direction) due to the arrangement of the primary main shield member 23 and the secondary main shield member 43. Thereby, the restrictions when mounting the power receiving pad 40 and the secondary side main shield member 43 outside the floor surface of the vehicle 10 or installing the power transmission pad 20 and the primary side main shield member 23 on the ground side are alleviated. You can also

  (2) The primary side main shield member 23 is configured separately from the power transmission pad 20. For this reason, for example, the maintainability of the primary side main shield member 23 and the power transmission pad 20 can be improved as compared with the case where the primary side main shield member 23 and the power transmission pad 20 are configured integrally. Thereby, the cost and man-hour in the case of exchanging parts etc. which constitute primary side main shield member 23 and power transmission pad 20 can be reduced.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  In the present embodiment, the sub-shield member is provided in the non-contact power supply device in order to further increase the leakage electromagnetic field reduction effect.

  FIG. 8 is a plan view of the power receiving pad 40 according to the present embodiment. FIG. 8 corresponds to FIG. Moreover, in this embodiment, the same code | symbol is attached | subjected in the figure about the member same as the member demonstrated in the said 1st Embodiment.

  As shown in the drawing, in the present embodiment, the secondary side secondary shield member having a rectangular plate shape in contact with the inner edge of the secondary side main shield member 43 in a front view of the plate surface of the secondary side winding portion 41a. 44 is arranged. Here, in the present embodiment, the secondary side auxiliary shield member 44 is made of a material having a relative magnetic permeability lower than 1 in the use frequency band of non-contact power feeding, and specifically, has conductivity such as aluminum and copper. It is made of a nonmagnetic material having a ferromagnetic material such as iron having a predetermined thickness or more (for example, a thickness of 0.5 mm or more).

  Further, as shown in FIG. 9, the secondary side secondary shield member 44 is disposed in close contact with the secondary side connecting portion 41b. 9 is a cross-sectional view taken along the line AA in FIG. 8, and corresponds to FIG.

  On the other hand, the primary side auxiliary shield member 24 is also provided on the power transmission pad 20 side, similarly to the power reception pad 40 side. Specifically, as shown in FIG. 10, the primary side secondary shield member 24 is embedded in the parking space. The primary side secondary shield member 24 has the same configuration as the secondary side secondary shield member 44. The primary side secondary shield member 24, the primary side primary shield member 23, and the power transmission pad 20 are in a positional relationship between the secondary side secondary shield member 44 and the secondary side primary shield member shown in FIGS. 43 and the positional relationship of the power receiving pad 40 are the same. FIG. 11 shows a view of the parking space of FIG. 10 as viewed from above the vehicle 10.

  Then, the effect by arrangement | positioning of the primary side secondary shield member 24 and the secondary side secondary shield member 44 is demonstrated using FIG. FIG. 12 corresponds to FIG.

  As shown in the drawing, the arrangement of the primary side secondary shield member 24 can reduce the leakage electromagnetic field near the opposite side of the surface of the primary side coupling portion 21b from the power receiving pad 40 side. Moreover, the arrangement | positioning of the secondary side subshield member 44 can reduce the leakage electromagnetic field of the surface side of the secondary side connection part 41b near the opposite side to the power transmission pad 20 side.

  On the other hand, in the comparative technique shown in FIG. 13, the surface of the primary side connecting portion 21b is near the side opposite to the power receiving pad 40 side, and the surface of the secondary side connecting portion 41b is opposite to the power transmitting pad 20 side. The leakage electromagnetic field near the side cannot be reduced. Here, the comparative technique is a configuration in which the primary main shield member 23 and the secondary main shield member 43 according to the present embodiment are removed. In FIG. 13, “α1” to “α4” indicate eddy currents generated during non-contact power feeding.

  The reason why the leakage electromagnetic field cannot be reduced by the comparison technique is that the eddy current flowing at the end of the primary side secondary shield member 24 or the secondary side secondary shield member 44 at the time of non-contact power feeding, as shown in the figure, This is because the leakage electromagnetic field increases in the vicinity of “α1” and “α3”.

  According to the present embodiment described above, in addition to the effects (1) and (2) described in the first embodiment, the following effects can be obtained.

  (3) The primary side secondary shield member 24 and the secondary side secondary shield member 44 are provided. For this reason, the effect of reducing the leakage electromagnetic field can be further increased. In particular, in the present embodiment, there is no gap between the primary side main shield member 23 and the primary side sub shield member 24 and between the secondary side main shield member 43 and the secondary side sub shield member 44. Since the main shield member and the sub shield member are arranged, the effect of reducing the leakage electromagnetic field is great. For this reason, the malfunction etc. of a surrounding electronic device can be avoided more suitably. In addition, it has been investigated by the present inventors that the leakage electromagnetic field in the present embodiment is “1/3” of the leakage electromagnetic field in the comparative technique.

(Third embodiment)
Hereinafter, the third embodiment will be described with reference to the drawings with a focus on differences from the second embodiment.

  In the present embodiment, the configuration of the non-contact power feeding device is changed to increase the leakage electromagnetic field reduction effect.

  In FIG. 14, sectional drawing of the non-contact electric power feeder concerning this embodiment is shown. FIG. 14 corresponds to FIG.

  As shown in the figure, in this embodiment, the outer edge of the plate surface of the primary winding portion 21a (indicated by A in the figure) and the inner edge of the primary side main shield member 23 (indicated by B in the figure). ) Between the power transmission pad 20 and the primary side so that the distance (shortest distance) l1 is longer than the distance l2 between the plate surface of the primary side winding portion 21a and the plate surface of the secondary side winding portion 41a. A main shield member 23 and a primary side main shield member 23 are configured. Also, on the power receiving pad 40 side, the distance (shortest distance) between the outer edge of the plate surface of the secondary side winding portion 41a and the inner edge of the secondary side main shield member 43 is the plate surface of the primary side winding portion 21a. The power receiving pad 40, the secondary side main shield member 43, and the secondary side sub shield member 44 are configured to be longer than the distance between the plate surfaces of the secondary side winding portion 41a.

  According to such an arrangement, an increase in leakage inductance between the primary side coil 22 and the secondary side coil 42 can be further suppressed, and as a result, a decrease in the coupling coefficient between the coils can be further suppressed.

(Fourth embodiment)
Hereinafter, the fourth embodiment will be described with reference to the drawings with a focus on differences from the second embodiment.

  In this embodiment, the arrangement | positioning aspect of a subshield member is changed.

  FIG. 15 is a plan view of the power receiving pad 40 according to the present embodiment, and FIG. 16 is a cross-sectional view taken along line AA of FIG. 15 and 16 correspond to FIGS. 8 and 9 described above. Moreover, in this embodiment, the same code | symbol is attached | subjected in the figure about the member same as the member demonstrated in the said 2nd Embodiment.

  In this embodiment, the secondary side main shield member 43a is a rectangular plate-like member having a larger area than the secondary side sub shield member 44, as shown in FIGS. And the secondary side main shield member 43a is closely_contact | adhered and arrange | positioned on the opposite side to the secondary side connection part 41b side among the surfaces of the secondary side subshield member 44, as shown in FIG. The same applies to the power transmission pad 20 side.

  In the present embodiment, the method described in the third embodiment is employed to increase the leakage electromagnetic field reduction effect. Here, FIG. 17 shows a cross-sectional view of the non-contact power feeding apparatus according to the present embodiment. FIG. 17 corresponds to FIG.

  As shown in the drawing, in the present embodiment, the primary side main shield out of the outer edge of the plate surface of the primary side winding portion 21 a (indicated by A in the drawing) and the outer side edge of the primary side auxiliary shield member 24. The distance (shortest distance) l3 to the side in contact with the member 23a (indicated by B in the figure) is the distance l4 between the plate surface of the primary side winding portion 21a and the plate surface of the secondary side winding portion 41a. The power transmission pad 20, the primary side main shield member 23a, and the primary side sub shield member 24 are configured so as to be longer. The same applies to the power receiving pad 40 side.

  According to the present embodiment described above, the same effects as those obtained in the third and fourth embodiments can be obtained.

(Fifth embodiment)
Hereinafter, the fifth embodiment will be described with reference to the drawings with a focus on differences from the second embodiment.

  In the present embodiment, the configuration of the main shield member is changed.

  FIG. 18 is a plan view of the power receiving pad 40 according to the present embodiment, and FIG. 19 is a cross-sectional view taken along line AA of FIG. 18 and 19 correspond to FIGS. 8 and 9 described above. Moreover, in this embodiment, the same code | symbol is attached | subjected in the figure about the member same as the member demonstrated in the said 2nd Embodiment.

  As shown in FIG. 18, in this embodiment, in the front view of the plate surface of the secondary side winding portion 41a, the secondary side main shield member 43 to the secondary side main shield member 43 in the longitudinal direction and the width direction respectively. There are provided a plurality of first protrusions 43c extending outward. In addition, as shown in FIG. 19, in each of the first protrusions 43 c, a second direction extending from the first protrusion 43 c in the direction orthogonal to the first protrusion 43 c and toward the power transmission pad 20 side. 43d is provided. Similar to the secondary main shield member 43, these protrusions 43c and 43d are made of a soft magnetic material. Incidentally, the 1st protrusion part 43c and the 2nd protrusion part 43d may be integrally formed with the secondary side main shield member 43, and it connects with the secondary side main shield member 43 as another member. It may be what has been done. The same applies to the power transmission pad 20 side.

  According to the present embodiment described above, the protruding portions 43c and 43d corresponding to the installation space of the non-contact power feeding device can be provided as the main shield member. For this reason, the reduction effect of a leakage electromagnetic field can be enlarged, suppressing the increase in the physique of the non-contact electric power feeder by providing a main shield member.

(Sixth embodiment)
Hereinafter, the sixth embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  In this embodiment, the arrangement | positioning aspect of the main shield member by the side of the power transmission pad 20 is changed.

  FIG. 20 shows a layout view of main shield members and the like in the parking space, and FIG. 21 shows a view of the parking space in FIG. 20 and 21 correspond to FIGS. 5 and 6 described above.

  As shown in FIG.20 and FIG.21, in this embodiment, the primary side main shield member 23 is removed and the ring stopper 72a and the line 74a which partitions a parking space are used as a main shield member. Specifically, in this embodiment, a soft magnetic material is disposed in the ring stopper 72a, and the line 74a is formed by a paint containing the soft magnetic material.

  According to this embodiment described above, the main shield member can be installed without burying the main shield member in the parking space. For this reason, the cost and the man-hour reduction effect for arrange | positioning the main shield member by the side of the power transmission pad 20 can be expected.

(Seventh embodiment)
Hereinafter, the seventh embodiment will be described with reference to the drawings with a focus on differences from the sixth embodiment.

  In this embodiment, the arrangement | positioning aspect of the main shield member by the side of the power transmission pad 20 is changed.

  FIG. 22 shows a layout of main shield members and the like in the parking space, and FIG. 23 shows a view of the parking space in FIG. 22 and 23 correspond to FIGS. 20 and 21 described above.

  As shown in FIG. 22, in this embodiment, the primary side main shield member 23c embedded in a parking space is enlarged. Specifically, as shown in FIG. 23, a frame-shaped primary-side main shield member 23 c is embedded along the line 74 inside the line 74. Since the effect of reducing the leakage electromagnetic field is increased as the primary side main shield member 23c is larger, according to the present embodiment, the effect of reducing the leakage electromagnetic field can be further increased.

(Eighth embodiment)
Hereinafter, the eighth embodiment will be described with reference to the drawings with a focus on differences from the second embodiment.

  In the present embodiment, the configuration of the sub shield member on the power receiving pad 40 side is changed.

  FIG. 24 shows a layout of main shield members and the like in the parking space, and FIG. 25 shows a view of the vehicle 10 of FIG. FIG. 24 corresponds to FIG.

  As shown in FIG. 24, in the present embodiment, the sub shield member on the power receiving pad 40 side is replaced with the secondary side sub shield member 44 as a member 44 a that constitutes the chassis of the vehicle 10. Such a method can be applied because the member 44a is usually made of a steel material having a thickness of 0.5 mm or more, and the relative permeability is lower than 1 in the use frequency band of non-contact power feeding.

  According to this embodiment described above, since the member which comprises the vehicle 10 can be diverted to a subshield member, the cost of a non-contact electric power feeder can be reduced and the weight of the vehicle 10 can be reduced. it can.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  -The "main shield member" is not limited to a frame shape surrounding the core. For example, as shown in FIG. 26, in a front view of the plate surface of the secondary side winding part 41a, a pair of members arranged with the secondary side core 41 sandwiched in parallel with the longitudinal direction of the secondary side coupling part 41b You may comprise as 43e and 43f. Further, for example, as shown in FIG. 27, in a front view of the plate surface of the secondary side winding portion 41a, the pair of secondary side winding portions 41a are parallel to the longitudinal direction of the secondary side coupling portion 41b. You may comprise as a pair of rod-shaped member 43g, 43h arrange | positioned on both sides of the secondary side core 41 on both sides. Even in these cases, since the magnetic flux can be guided from one of the plate surfaces of the pair of secondary winding portions 41a to the other by the main shield member, the effect of reducing the leakage electromagnetic field can be obtained. . The same applies to the power transmission pad 20 side. 26 and 27 correspond to FIG. 3 described above.

  Further, the “main shield member” is not limited to the one arranged corresponding to each of the primary side coil 22 and the secondary side coil 42, and may be shared by these coils 22 and 42. .

  The arrangement method of the “main shield member” is not limited to the one exemplified in the second embodiment. For example, as shown in FIG. 28, the frame-shaped secondary side main shield member 43 i may be disposed so as to be in contact with the power receiving pad 40 side on the surface of the secondary side sub shield member 44. Further, for example, as shown in FIG. 29, a frame-shaped secondary side main shield member 43j may be arranged so as to be in contact with the opposite side of the surface of the secondary side sub shield member 44 from the power receiving pad 40 side. Good. 28 and 29 correspond to FIG. 9 described above.

  -The position of the power receiving pad is not limited to the outside of the floor surface of the vehicle 10. For example, if there is a power supply facility in which the power transmission pad is arranged above the vehicle 10, the arrangement position of the power reception pad may be the upper part of the vehicle. Further, for example, if there is a power supply facility in which the power transmission pad is disposed behind the vehicle 10, the power receiving pad may be disposed at the rear portion of the vehicle 10.

  The “primary core” and the “secondary core” are not limited to those exemplified in the first embodiment. For example, what was described in the said patent document 1 may be used.

  In each of the above embodiments, a main shield member corresponding to each of the power transmission pad 20 and the power reception pad 40 (for example, the primary side main shield member 23 and the secondary side main shield member 43 in the first embodiment) is provided. However, the present invention is not limited to this, and a configuration in which a main shield member corresponding to one of them is provided may be employed. Even in this case, the present inventors can obtain at least 50% of the effect of reducing the leakage electromagnetic field when the main shield member corresponding to each of the power transmission pad 20 and the power reception pad 40 is provided. It is being investigated.

  The arrangement mode of the “sub shield member” is not limited to that illustrated in the second embodiment. For example, the secondary auxiliary shield member 44 may be disposed inside the secondary main shield member 43 while being separated from the shield member 43 in a front view of the plate surface of the secondary winding portion 41a. . Even in this case, the effect of reducing the leakage electromagnetic field can be increased as compared with the first embodiment. The same applies to the primary side auxiliary shield member 24.

  -As a protrusion part, it is not restricted to what was illustrated to the said 5th Embodiment. For example, in a front view of the plate surface of the secondary side winding part 41a, a protrusion that extends in the longitudinal direction of the secondary side main shield member 43, a protrusion that extends in the width direction, and a protrusion that extends in a direction orthogonal to these. Only one or two of them may be provided. Further, the extending direction of the protruding portion is not limited to the longitudinal direction and the width direction.

  In the sixth embodiment, it is not necessary to place a soft magnetic body in the ring stopper 72a. That is, the ring stopper 72a may not be used as the main shield member.

  In the second embodiment, the primary side main shield member 23 and the primary side sub shield member 24 are embedded in the parking space, but the present invention is not limited to this. For example, as shown in FIG. 30, you may arrange | position on the road surface of a parking space. In the seventh embodiment, the primary main shield member 23c may be disposed so as to be exposed on the road surface of the parking space. In this case, the primary side main shield member 23c can be used as a line that partitions the parking space.

  The core shape and coil winding method are not limited to those exemplified in the above embodiments. For example, as shown in FIG. 31, a method of winding the secondary coil 42 so as to pass through the inside of the peripheral edge portion 41c of the secondary winding portion 41a and the peripheral edge portion 46 of the secondary side connecting portion 41b. It may be adopted. Thereby, since a coil is no longer wound outside the peripheral part 41c of the secondary side winding part 41a, the increase in a physique can be avoided. Further, for example, as shown in FIG. 32, the secondary coils 42 wound around the pair of secondary winding portions 41a on the power transmission pad 20 side in the surface of the secondary side connecting portion 41b come into contact with each other. A core may be formed. Further, for example, the secondary side coil 42 may not be wound around the secondary side winding part 41a but the secondary side coil 42 may be wound around the secondary side coupling part 41b. The same applies to the power transmission pad 20 side.

  -In the said 6th Embodiment, although the wheel stopper 72a and the line 74a were used as a main shield member, it is not restricted to this. In short, if other members or devices in the vicinity of the space where the power supply facility of the vehicle 10 is provided can be used as the main shield member, these may be used as the main shield member.

  The “primary coil” and the “secondary coil” are not limited to those wound around the core, and may be air-core coils. In this case, for each of the primary side coil and the secondary side coil, the pair of magnetic pole portions may be, for example, open surfaces at both ends of the coil.

  When an air-core coil is used, the application target of the present invention is not limited to a non-contact power feeding device using electromagnetic induction, but may be a non-contact power feeding device using a resonance method. Here, the resonance method is a technique in which a pair of resonance circuits (for example, a pair of resonance coils) are resonated in an electromagnetic field and power is transmitted through the electromagnetic field. Even in this case, the application of the present invention is considered to be effective if the electromagnetic field generated between the resonant coils leaks to the outside and the power transmission efficiency may decrease.

  22 ... primary side coil, 23 ... primary side main shield member, 42 ... secondary side coil, 43 ... secondary side main shield member.

Claims (10)

A primary coil (22) for power transmission;
A secondary coil (42) for receiving power;
When non-contact power feeding is performed, main shield members (23, 43, 23a, 43a, 72a, 74a, 23c, 43e-43j),
With
The main shield member is disposed corresponding to only the primary side coil among the primary side coil and the secondary side coil, and the secondary side among the primary side coil and the secondary side coil. Are arranged corresponding to only the side coils, or individually arranged corresponding to the primary side coil and the secondary side coil,
The main shield member guides a magnetic flux from one to the other with respect to a pair of magnetic pole portions corresponding to a coil corresponding to the main shield member among the primary side coil and the secondary side coil, and Arranged separately from each of the primary coil and the secondary coil;
Said main shield member, and forms a Bian flat shape, characterized in that said primary coil and said secondary coil are arranged in proximity with the coils corresponding to said main shield member itself in a direction opposite A non-contact power feeding device. A primary core (21) around which the primary coil is wound;
A secondary core (41) around which the secondary coil is wound;
With
The non-contact power feeding device according to claim 1, wherein the main shield member is further disposed apart from each of the primary side core and the secondary side core. Each of the primary side core and the secondary side core is:
A pair of spaced-apart portions (21a, 41a) having planes parallel to each other and spaced apart from each other;
A connecting portion (21b, 41b) that connects these spaced-apart portions;
The non-contact electric power feeder of Claim 2 characterized by the above-mentioned.   In the non-contact power feeding device, when the non-contact power feeding is performed, the plane of the separation portion (21a) included in the primary core and the plane of the separation portion (41a) included in the secondary core face each other. The contactless power feeding device according to claim 3, wherein the contactless power feeding device is configured as described above. Of the primary side coil and the secondary side coil, a coil arranged corresponding to the main shield member (23, 43, 74a, 23c) itself is a target coil,
It said main shield member, in a front view of the plane of the separation portion provided in the core where the target coil is wound among the primary core and the secondary core, a core the subject coil is wound The non-contact power feeding device according to claim 3 or 4, wherein the non-contact power feeding device has a surrounding frame shape. A secondary shield member (24) corresponding to at least one of the primary side coil and the secondary side coil and disposed on the side opposite to the side where the primary side coil and the secondary side coil face each other. , 44, 44a),
The secondary shield member is made of a material having a relative permeability lower than 1 at a frequency of a voltage applied to the primary coil when non-contact power feeding is performed. The contactless power supply device according to any one of the above. Each of the primary side core and the secondary side core is:
A pair of spaced-apart portions (21a, 41a) having planes parallel to each other and spaced apart from each other;
A connecting portion (21b, 41b) that connects these spaced-apart portions;
With
In the non-contact power feeding device, when the non-contact power feeding is performed, the plane of the separation portion (21a) included in the primary core and the plane of the separation portion (41a) included in the secondary core face each other. Configured as
The contactless power supply device further includes a distance between the outer edge of the plane of the separation portion provided in the primary core and the main shield member and the separation provided in the secondary core when contactless power supply is performed. The shorter one of the outer edge of the plane of the part and the distance between the main shield members is shorter than the distance between the plane of the spacing part provided in the primary core and the plane of the spacing part provided in the secondary core. It is comprised so that it may become long, The non-contact electric power feeder of any one of Claims 2-6 characterized by the above-mentioned. Said main shield member (43) has a plurality of protrusions made of and ferromagnetic projecting from the main shield member (43c, 43d) to any one of claims 1 to 7, further comprising a The non-contact electric power feeder of description. The secondary coil is provided in the vehicle (10),
The primary coil is provided in a power supply facility for supplying power to the vehicle,
The main shield member (23, 74a, 23c) is arranged so as to guide a magnetic flux from one to the other with respect to the pair of magnetic pole portions corresponding to the primary coil, and the primary coil is The non-contact power feeding device according to claim 1, wherein the non-contact power feeding device is configured as a separate body. The secondary coil is provided in the vehicle (10),
The primary coil is provided in a power supply facility for supplying power to the vehicle,
A secondary shield member (44a) disposed on the side opposite to the side where the secondary side coil and the primary side coil are opposed to each other further corresponds to the secondary side coil,
The sub shield member is a component of the vehicle and is made of a material having a relative permeability lower than 1 at a frequency of a voltage applied to the primary coil when non-contact power feeding is performed. The non-contact electric power feeder of any one of Claims 1-9 characterized by the above-mentioned.

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