JP7272051B2 - Power transmitting device, power receiving device and contactless power supply system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a contactless power supply system capable of supplying power in a contactless manner. The present invention also relates to a power transmitting device and a power receiving device used in a contactless power supply system.

In recent years, the use of CFRP (carbon fiber reinforced resin) and other resins in vehicle bodies has reduced vehicle weight, thereby improving the power consumption and fuel efficiency of EVs (electric vehicles) and PHVs (plug-in hybrid vehicles). Efforts are underway.

In addition, development of a contactless power supply system that facilitates charging of EVs and PHVs is also underway. As a method of contactless power supply, a method of transmitting electric power using magnetic field coupling between a power transmitting coil and a power receiving coil has attracted attention. This method has the advantages of being able to transmit power even if the power transmitting coil and the power receiving coil are relatively distant, being resistant to positional deviation of the power transmitting coil and the power receiving coil, and having a high degree of freedom in arrangement.

Patent Literature 1 describes, as a coil unit used for contactless power supply, a configuration in which a protrusion is provided in the center of a magnetic plate made of ferrite, and a coil is wound along the outer periphery of the protrusion. The projection improves the coupling coefficient between the power transmitting coil and the power receiving coil, thereby suppressing the leakage magnetic field.

In Patent Document 2, as a coil unit used for contactless power supply, a plate-shaped magnetic plate made of ferrite, a coil provided on the surface of the magnetic plate, and a metal plate provided on the back surface of the magnetic plate. is shown. It is described that the magnetic plate has a hollow portion in the center and projections radially extending in the outer peripheral direction, and is composed of eight parts. The magnetic flux flowing in from the coil tends to flow radially around the outer periphery of the magnetic body. coefficient increases. As a result, according to the coil unit of Patent Literature 2, the leakage magnetic field can be suppressed.

JP 2016-103613 A JP 2018-64422 A

Conventionally, iron was used as a material for the vehicle body, so the vehicle body functioned as a magnetic field shield material. However, when the body of an EV or PHV is replaced with a resin such as CFRP instead of iron, the body of the vehicle loses its magnetic field shielding effect because CFRP is a non-magnetic material and has low electrical conductivity. When a contactless power supply system is applied to EVs and PHVs with such resin-made bodies, there is a possibility that a magnetic field may leak into the vehicle interior, and there is concern about the effects of magnetic field exposure on humans. In addition, it is conceivable that in-vehicle equipment and the like may malfunction. Therefore, a method for suppressing magnetic field leakage into the passenger compartment has been demanded.

In Patent Document 1, heat generated in the coil during power transmission may be conducted to the magnetic material. Generally, it is known that the magnetic permeability decreases as the temperature of the magnetic material rises. Therefore, there is a possibility that the coupling coefficient between the power transmitting coil and the power receiving coil may decrease due to the temperature of the magnetic material, and the effect of suppressing magnetic field leakage may also decrease.

Moreover, in Patent Document 2, since the magnetic plate is composed of eight parts having a complicated shape, it is difficult to process each part, and the problem is an increase in processing time and cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a contactless power supply system in which leakage magnetic fields are suppressed.

The present invention includes a power transmission coil that transmits power, a bottom portion that covers the side opposite to the power transmission side of the power transmission coil, and a side portion that is connected at an edge of the bottom portion and covers the side surface of the power transmission coil, The power transmission side has an open housing and a first conductor plate made of a conductive metal disposed between the power transmission coil and the bottom surface, the bottom surface having a lower permeability than the first conductor plate. A layer made of a magnetic material with high magnetic permeability and low electrical conductivity is included, and the side portion includes a metal layer made of a metal having a higher electrical conductivity than the bottom portion and a relative magnetic permeability of 25 or more. It is a power transmission device.

Further, the present invention includes a power receiving coil that receives electric power, a bottom portion that covers the side of the power receiving coil opposite to the power receiving side, and a side portion that is connected to the edge of the bottom portion and covers the side of the power receiving coil. The power receiving side has an open housing and a first conductor plate made of a conductive metal and disposed between the power receiving coil and the bottom surface, and the bottom surface is closer to the first conductor plate than the first conductor plate. A layer made of a magnetic material having a high relative permeability and a low conductivity is included, and the side portion includes a metal layer made of a metal having a higher conductivity than the bottom portion and a relative permeability of 25 or more . It is a power receiving device that

The power transmission device of the present invention may further include a second conductor plate made of a conductive metal, which is arranged near the bottom portion and on the side opposite to the power transmission side. Leakage magnetic fields can be further suppressed. Similarly, the power receiving device of the present invention may further include a second conductive plate made of a conductive metal, which is arranged near the bottom surface and on the side opposite to the power receiving side.

In the present invention, in order to further suppress the leakage magnetic field, it is preferable to do as follows. The bottom portion is preferably made of a material having a relative magnetic permeability of 100 or more and an electrical conductivity of 1×10 ⁻² S/m or less. The metal layer is preferably made of a material having a conductivity of 1×10 ⁷ S/m or higher.

In the present invention, the side portion may be a laminate of a metal layer and a nonmagnetic layer made of a material having a lower relative magnetic permeability than that of the bottom portion.

In the power transmission device of the present invention, H1 is the height of the housing, and H2 is the height from the surface of the bottom portion on the side of the first conductor plate to the power transmission coil, and H1 is 0.9 to 1.5 times H2. It is preferably set as follows. The leakage magnetic field can be further suppressed while suppressing the height of the power transmission device. Similarly, in the power receiving device of the present invention, H1 is the height of the housing, and H2 is the height from the surface of the bottom portion on the side of the first conductor plate to the power receiving coil, where H1 is 0.9 to 1.5 of H2. It is preferably set to double.

Further, according to the present invention, there is provided a contactless power supply system including the power transmitting device of the present invention and a power receiving device that receives power from the power transmitting device, wherein power is transmitted from the power transmitting device to the power receiving device in a contactless manner by a magnetic coupling method. is.

In the contactless power supply system of the present invention, the power transmitting device may be placed on the ground, the power receiving device may be placed on the bottom of the vehicle, and the vehicle may be an electric vehicle or a plug-in hybrid vehicle having a resin body. Even if the body is made of resin, the leakage magnetic field can be more effectively suppressed.

ADVANTAGE OF THE INVENTION According to this invention, a leakage magnetic field can be suppressed by providing a housing|casing, without deteriorating power transmission efficiency.

1 is a diagram showing the configuration of a contactless power supply system according to a first embodiment; FIG. The figure which looked at the power transmission apparatus 1 from upper direction. The figure which showed the modification of the side part 16. FIG. The figure which showed the model of simulation. A graph comparing the maximum value of leakage magnetic field.

Specific examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to the examples.

FIG. 1 is a diagram showing the configuration of the contactless power supply system of Example 1. As shown in FIG. As shown in FIG. 1 , the contactless power supply system of Example 1 has a power transmission device 1 and a power reception device 2 . The power transmission device 1 is arranged on the ground such as the road surface of a parking lot, and the power reception device 2 is arranged on the bottom surface of the vehicle 3 . Power is supplied to the vehicle by transmitting power from the power transmitting device 1 to the power receiving device 2 by the magnetic coupling method. The transmission frequency is, for example, 85 kHz. The vehicle 3 is, for example, an electric vehicle (EV) or a plug-in hybrid vehicle (PHV) having a resin body such as CFRP.

(Regarding power transmission device 1)
The power transmission device 1 has a power transmission coil 10 , a magnetic core 11 , a first conductor plate 12 , a housing 13 and a second conductor plate 14 . FIG. 2 is a diagram of the power transmission device 1 viewed from above.

The magnetic core 11 is a rectangular flat plate made of ferrite. The material of the magnetic core 11 is not limited to ferrite, and may be any magnetic material. Iron, nickel, cobalt, alloys containing them as main components (for example, silicon steel), and the like can be used.

The power transmission coil 10 is a planar coil arranged on one surface 11 a side (above) of the magnetic core 11 . A capacitor (not shown) and an AC power supply are connected to the power transmission coil 10, and the power transmission coil 10 and the capacitor constitute an LC resonator.

The power transmission coil 10 may be in contact with the magnetic core 11, but it is preferable that they are separated from each other. This is because the heat generated in the power transmission coil 10 may be conducted to the magnetic core 11 and the relative magnetic permeability of the magnetic core 11 may decrease.

The shape of power transmission coil 10 is not limited to a planar coil, and may be, for example, a solenoid coil in which magnetic core 11 is a rod-shaped body and a conductive wire is wound around the rod-shaped body.

The first conductor plate 12 is a rectangular flat plate made of aluminum and arranged with a gap on the other surface 11b side (lower side) of the magnetic core 11 . The first conductor plate 12 is arranged so that its surface is parallel to the surface of the magnetic core 11 . The size and arrangement of the first conductor plate 12 are set so as to include the magnetic core 11 when viewed from above. The thickness of the first conductor plate 12 is arbitrary as long as it is thicker than the skin thickness. By providing the first conductor plate 12 in this way, the magnetic field generated on the side opposite to the power receiving device 2 is shielded by generating an eddy current in the first conductor plate 12, thereby suppressing magnetic field leakage. there is

The material of the first conductor plate 12 is not limited to aluminum. Any metal material having electrical conductivity may be used. For example, copper, silver, gold, etc. can be used in addition to aluminum. Moreover, the material which plated them may be used. For example, a material having a conductivity of 1×10 ⁷ S/m or more is preferable.

The housing 13 is a rectangular parallelepiped box-shaped object that surrounds the power transmission coil 10 , the magnetic core 11 , and the first conductor plate 12 and is open on the power receiving device 2 side. By not covering the power receiving device 2 side of the power transmission coil 10, deterioration in power transmission efficiency is prevented. The housing 13 has a bottom surface portion 15 that is the bottom surface of a rectangular parallelepiped, and side surface portions 16 that are four side surfaces of the rectangular parallelepiped.

The bottom portion 15 is a bottom portion of the housing 13 having a rectangular parallelepiped box shape, and is located below the first conductor plate 12 (near the surface of the first conductor plate 12 on the side opposite to the side where the magnetic core 11 is arranged). ) and are rectangular flat plates. The bottom surface portion 15 is arranged so that its surface is parallel to the surface of the first conductor plate 12 . Further, the size and arrangement of the bottom portion 15 are set so as to include the first conductor plate 12 when viewed from above. The thickness of the bottom portion 15 is arbitrary as long as it is thicker than the skin thickness.

The bottom portion 15 is made of ferrite. Other than ferrite, any material having a higher relative magnetic permeability than the first conductor plate 12 (for example, 10 times or more that of the first conductor plate 12) and a low conductivity (for example, 1/10 or less that of the first conductor plate 12) It can be a magnetic material. For example, various materials listed as materials for the magnetic core 11 can be used, such as iron, nickel, cobalt, and alloys containing them as main components (for example, silicon steel).

By making the bottom portion 15 of such a magnetic material, the direction of the magnetic field generated on the side opposite to the power receiving device 2 side is changed, thereby suppressing magnetic field leakage. In addition, by forming the bottom surface portion 15 from a magnetic material with low conductivity, generation of a magnetic field in a direction that cancels out a magnetic field that contributes to power transmission is suppressed due to the mirror image effect, thereby suppressing deterioration in power transmission efficiency. In other words, magnetic field leakage can be suppressed without deteriorating the power transmission efficiency by forming the bottom portion 15 from the magnetic material as described above.

The material of the bottom portion 15 is preferably a material having a relative magnetic permeability of 100 or higher. Also, a material having an electrical conductivity of 1×10 ⁻² S/m or less is preferable.

The side surface portion 16 is a side portion of the housing 13 which has a rectangular parallelepiped box shape, and includes four flat plates connected to each side of the bottom surface portion 15 and perpendicular to the surface of the bottom surface portion 15 . are connected in a cylindrical shape with a rectangular cross section. The thickness of the side portion 16 is arbitrary as long as it is thicker than the skin thickness.

The side portion 16 is made of a metal having a higher electrical conductivity than the bottom portion 15 . For example, the same material as that of the first conductor plate 12, which is a metal whose conductivity is ten times or more that of the bottom portion 15, can be used. The material of the side portion 16 may be either magnetic or non-magnetic. By using such a metal for the side surface portion 16, the magnetic field generated on the side surface side of the power transmission coil 10 is shielded by generating an eddy current in the side surface portion 16, thereby suppressing the leakage magnetic field.

The height H1 of the housing 13 (the width of the side surface portion 16 in the direction perpendicular to the surface of the bottom surface portion 15) is made equal to the height H2 from the surface of the bottom surface portion 15 on the side of the first conductor plate 12 to the power transmitting coil 10. is set to By setting in this way, the height of the power transmission device 1 can be suppressed, and the magnetic field leakage can be sufficiently suppressed while facilitating the mounting of the power transmission device 1 on the road surface. Note that the height H1 of the housing 13 may be higher than the height H2 up to the power transmission coil 10 . Although the height of the power transmission device 1 is increased, the leakage magnetic field can be further suppressed. A preferred range for H1 is 0.9 to 1.5 times H2, more preferably 1.0 to 1.2 times H2.

In the first embodiment, the side portion 16 is composed of one layer of metal, but may be composed of two layers of the metal layer 16a and the non-magnetic layer 16b. In this case, the metal layer 16a may be on the inner side (on the power transmitting coil 10 side) (see FIG. 3A), or the non-magnetic layer 16b may be on the inner side (see FIG. 3B). The non-magnetic layer 16b may be made of any material having a sufficiently lower relative magnetic permeability than that of the bottom portion 15 (for example, 1/10 or less of that of the bottom portion 15), and may be metal or non-metal. For example, the non-magnetic layer 16b can be made of a resin material. By using a material that is cheaper or lighter than the metal layer 16a for the non-magnetic layer 16b, the material cost and weight of the side surface portion 16 can be reduced.

In addition, the housing 13 does not necessarily have to be rectangular parallelepiped, and is connected to the bottom surface portion 15 covering the side opposite to the power receiving side of the power transmitting coil 10 at the edge of the bottom portion 15, The power receiving side of the power transmission coil 10 may have any shape as long as it has a side portion 16 that covers the direction perpendicular to the direction) and the power receiving side of the power transmission coil 10 is open. For example, housing 13 may be cylindrical. Also, for example, the bottom surface portion 15 and the side surface portion 16 do not need to be perpendicular, but may have an angle. Moreover, the side surface portion 16 does not need to cover the side surface side of the power transmission coil 10 all the way through 360°, and may be provided only in the direction in which it is desired to suppress the leakage magnetic field.

By providing the housing 13 as described above, magnetic field leakage can be suppressed without deteriorating power transmission efficiency.

The second conductor plate 14 is a rectangular flat plate made of aluminum and spaced apart below the bottom surface portion 15 (near the surface of the bottom surface portion 15 on the side opposite to the side on which the first conductor plate 12 is disposed). . The second conductor plate 14 is arranged such that its surface is parallel to the surface of the bottom surface portion 15 of the housing 13 . The thickness of the second conductor plate 14 is arbitrary as long as it is thicker than the skin thickness. The material of the second conductor plate 14 is not limited to aluminum, and any metallic material having electrical conductivity may be used. A material similar to that of the first conductor plate 12 can be used. By providing the second conductor plate 14, an eddy current can be generated in the second conductor plate 14 to suppress magnetic field leakage.

Although the second conductor plate 14 and the housing 13 are separated from each other in the first embodiment, they may be in contact with each other. Also, the second conductor plate 14 is not necessarily required, and may be omitted depending on installation cost, weight, and the like.

(Regarding the power receiving device 2)
The power receiving device 2 has a power receiving coil 20 , a magnetic core 21 and a conductor plate 22 .

The magnetic core 21 is a flat plate made of ferrite and spaced from the lower surface of the vehicle 3 . Magnetic core 21 is arranged such that its surface is substantially parallel to the surface of magnetic core 11 of power transmission device 1 . The material of the magnetic core 21 is not limited to ferrite, and may be any magnetic material. For example, materials listed as materials for the magnetic core 11 can be used.

The receiving coil 20 is a planar coil arranged on the surface 21a side (lower side) of the magnetic core 21 opposite to the vehicle 3 side. It has a rolled shape. The receiving coil 20 may be in contact with the magnetic core 21 or may be separated therefrom. The shape of power receiving coil 20 is not limited to a planar coil, and may be, for example, a solenoid coil in which magnetic core 21 is a rod-shaped body and a conductive wire is wound around the rod-shaped body. A capacitor (not shown) is connected to the power receiving coil 20, and the power receiving coil 20 and the capacitor (not shown) constitute an LC resonator. The resonance frequency on the power receiving coil 20 side is set to match the resonance frequency on the power transmission coil 10 side. The AC power received by the LC resonator consisting of the receiving coil 20 and the capacitor is converted into DC power and supplied to a battery (not shown) or the like mounted on the vehicle 3 .

The conductor plate 22 is a flat plate made of aluminum and arranged between the lower surface of the vehicle 3 and the surface 21b of the magnetic core 21 on the vehicle 3 side. The conductor plate 22 is arranged apart from the lower surface of the vehicle 3 and the magnetic core 21 . The lower surface of the vehicle 3 and the conductor plate 22 may be in contact with each other. The conductor plate 22 is arranged so that its surface is parallel to the surface of the magnetic core 21 . By providing the conductor plate 22, the magnetic field generated on the vehicle 3 side is shielded by generating an eddy current in the conductor plate 22, thereby suppressing magnetic field leakage.

The material of the conductor plate 22 is not limited to aluminum. Any metal material having electrical conductivity may be used, and various materials listed as the material of the first conductor plate 12 can be used.

In the first embodiment, the power receiving device 2 is not provided with the same structure as the housing 13 in order to reduce the weight of the vehicle 3, but it may be provided. It is possible to further suppress the leakage magnetic field.

As described above, in the contactless power supply system of the first embodiment, since the power transmission device 1 is provided with the housing 13, it is possible to suppress the leakage magnetic field without deteriorating the power transmission efficiency.

Next, experimental results regarding the contactless power supply system of Example 1 will be described.

When the non-contact power supply system of Example 1 was applied to power transmission to a vehicle, the leakage magnetic field inside the vehicle was calculated by simulation. The conditions were set as follows.

A vehicle body was made of CFRP, and the CFRP had a relative magnetic permeability of 1, a relative dielectric constant of 1, and an electrical conductivity of 2.5×10 ⁴ S/m. The shape and dimensions of the vehicle body, and the positions of the power transmission device 1 and the power reception device 2 are as shown in FIG. The vehicle body had a height (z-axis direction in FIG. 4) of 1300 mm, a total length (vehicle longitudinal direction, y-axis direction in FIG. 4) of 4480 mm, and a width (x-axis direction of FIG. 4) of 1800 mm. Also, as shown in FIG. 4, the vehicle body was provided with a plurality of holes to imitate the holes provided for convenience of production.

The power transmitting device 1 was placed on the ground, the lower surface of the vehicle body was positioned 250 mm from the ground, and the power receiving device 2 was placed in the center of the lower surface of the vehicle body. In addition, the power transmission coil 10 of the power transmission device 1 is shifted from the power reception coil 20 of the power reception device 2 by 100 mm in the vehicle right direction (x-axis positive direction) and by 75 mm in the vehicle front direction (y-axis positive direction). The distance between the coil 10 and the receiving coil 20 was set to 150 mm. The power transmitted from the power transmission device 1 to the power reception device 2 was 3.7 kW, and the transmission frequency was 85 kHz. The side surface portion 16 of the housing 13 of the power transmission device 1 has a relative magnetic permeability of 25, 50, 100, and 300, a relative permittivity of 1, and an electrical conductivity of 1.0×10 ⁷ S/m. Further, the bottom portion 15 of the housing 13 is made of ferrite, and the first conductor plate 12, the second conductor plate 14 and the conductor plate 22 are made of aluminum.

In the model described above, the strength of the leakage magnetic field was calculated at each point on a straight line (leakage magnetic field level evaluation line in FIG. 4) 65 mm from the lower surface of the vehicle body and 450 mm to the right of the center axis of the vehicle. Then, the maximum value of the leakage magnetic field on the straight line was extracted.

FIG. 5 is a graph comparing maximum leakage magnetic field values (A/m). For comparison, the maximum value of the leakage magnetic field was also calculated for the case where the housing 13 and the second conductor plate 14 were not provided (Comparative Example 1). Further, the maximum value of the leakage magnetic field in Comparative Example 1 is H0, the maximum value of the leakage magnetic field when the housing 13 and the second conductor plate 14 are provided is H, and the reduction rate (%) of the maximum value of the leakage magnetic field is 100. Defined and calculated by x(H0-H)/H0.

As shown in FIG. 5, it was found that the maximum value of the leakage magnetic field is reduced by providing the housing 13 and the second conductor plate 14 regardless of the relative magnetic permeability. The reduction rate of the maximum leakage magnetic field is 2.7% when the relative magnetic permeability of the side portion 16 of the housing 13 is 25, and 2.4% when the relative magnetic permeability is 50, 100, and 300. there were. As a result, it was found that when the relative magnetic permeability of the side surface portion 16 of the housing 13 is 25 or more, the reduction rate of the maximum value of the leakage magnetic field is approximately constant. The reason why the maximum value of the leakage magnetic field does not depend on the relative magnetic permeability is considered to be that the power receiving device 2 side of the housing 13 is open.

INDUSTRIAL APPLICABILITY The present invention can be used for power feeding EVs and PHVs.

1: power transmission device 2: power reception device 10: power transmission coil 11, 21: magnetic core 12: first conductor plate 13: housing 14: second conductor plate 15: bottom portion 16: side portion 20: power reception coil 22: conductor board

Claims (13)

a power transmission coil for transmitting power;
It has a bottom portion covering the side opposite to the power transmission side of the power transmission coil, and a side portion connected to the edge of the bottom portion and covering the side side of the power transmission coil, and the power transmission side is an open housing. ,
a first conductor plate disposed between the power transmission coil and the bottom portion and made of a conductive metal;
has
The bottom portion includes a layer made of a magnetic material having a higher relative permeability and a lower electrical conductivity than the first conductor plate,
The side portion includes a metal layer made of a metal having a higher electrical conductivity than the bottom portion and a relative magnetic permeability of 25 or more ,
A power transmission device characterized by: 2. The power transmission device according to claim 1, further comprising a second conductor plate made of a conductive metal, which is arranged near the bottom portion and on the side opposite to the power transmission side. 3. The power transmission device according to claim 1, wherein the bottom portion is made of a material having a relative magnetic permeability of 100 or more and an electrical conductivity of 1×10 ⁻² S/m or less. The power transmission device according to any one of claims 1 to 3, wherein the metal layer is made of a material having a conductivity of 1 x ¹⁰⁷ S/m or higher. 5. Any one of claims 1 to 4, wherein the side portion is a laminate of the metal layer and a non-magnetic layer made of a material having a lower relative magnetic permeability than that of the bottom portion. The power transmission device according to the paragraph. Assuming that the height of the housing is H1 and the height from the surface of the bottom portion on the first conductor plate side to the power transmission coil is H2, H1 is set to be 0.9 to 1.5 times H2. 6. The power transmission device according to any one of claims 1 to 5, wherein: a receiving coil for receiving electric power;
A housing having a bottom portion covering the side opposite to the power receiving side of the power receiving coil, and a side portion connected to the edge of the bottom portion and covering the side side of the power receiving coil, and the power receiving side being open. ,
a first conductor plate disposed between the power receiving coil and the bottom portion and made of a conductive metal;
has
The bottom portion includes a layer made of a magnetic material having a higher relative permeability and a lower electrical conductivity than the first conductor plate,
The side portion includes a metal layer made of a metal having a higher electrical conductivity than the bottom portion and a relative magnetic permeability of 25 or more ,
A power receiving device characterized by: 8. The power receiving device according to claim 7, wherein the bottom portion is made of a material having a relative magnetic permeability of 100 or more and an electrical conductivity of 1×10 ⁻² S/m or less. 9. The power receiving device according to claim 7, wherein the metal layer is made of a material having a conductivity of 1*10< ⁷ > S/m or more. 10. The side surface portion is a lamination of the metal layer and a non-magnetic layer made of a material having a lower relative magnetic permeability than that of the bottom surface portion. The power receiving device according to claim 1. Assuming that the height of the housing is H1 and the height from the surface of the bottom portion on the side of the first conductor plate to the receiving coil is H2, H1 is set to be 0.9 to 1.5 times H2. 11. The power receiving device according to any one of claims 7 to 10 , wherein: 7. The power transmission device according to claim 1, and a power reception device that receives power from the power transmission device, wherein the power transmission device is connected to the power reception device in a non-contact manner by a magnetic field coupling method. A contactless power supply system that transmits power. 13. The apparatus according to claim 12, wherein the power transmitting device is arranged on the ground, the power receiving device is arranged on the bottom surface of the vehicle, and the vehicle is an electric vehicle or a plug-in hybrid vehicle having a resin body. The contactless power supply system described.

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