JP7759976B2 - Non-contact power receiving device - Google Patents

Description

The present invention relates to a contactless power receiving device.

In recent years, research and development has been conducted into charging mobility vehicles equipped with secondary batteries that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy.

Research and development into charging and power supply is being conducted on contactless charging, which involves charging a vehicle's onboard battery without contact. For example, Patent Documents 1 to 3 describe systems that transmit power contactlessly from a power transmission coil installed in a charging station or the like to a power receiving coil installed in the vehicle. These systems use, for example, a conductive shielding member to prevent magnetic field leakage around the coil.

Japanese Patent Application Laid-Open No. 2021-65036 Japanese Patent Application Laid-Open No. 2020-167753 Japanese Patent Application Laid-Open No. 2018-182877

When contactless power transmission is performed with the power receiving unit misaligned with the power transmitting unit, magnetic loss generated in the shielding material attached to the power receiving unit can reduce power receiving efficiency, or magnetic fields can leak from the outer periphery of the shielding material, leaving room for improvement.

The present invention provides a contactless power receiving device that can improve power receiving efficiency and/or reduce magnetic leakage even if the power receiving unit is misaligned with the power transmitting unit.

The present invention provides
a power receiving unit attached to the vehicle body and capable of receiving power transmitted in a non-contact manner from a power transmitting unit installed outside the vehicle;
a shielding member provided around the power receiving portion;
a plate member formed of a material different from the shielding member and provided to overlap at least one of an inner circumferential portion and an outer circumferential portion of the shielding member,
the plate member includes a first plate member provided on the inner circumferential portion of the shield member and on a surface of the shield member facing the vehicle body,
The portion of the shield member where the first plate member is provided is configured so that its shape can bend back toward the vehicle body when power is transmitted from the power transmitting unit to the power receiving unit .
The present invention also provides
a power receiving unit attached to the vehicle body and capable of receiving power transmitted in a non-contact manner from a power transmitting unit installed outside the vehicle;
a shielding member provided around the power receiving portion;
a plate member formed of a material different from the shielding member and provided to overlap at least one of an inner circumferential portion and an outer circumferential portion of the shielding member,
the plate member includes a second plate member provided on the outer circumferential portion of the shield member and on a surface of the shield member facing the power transmission unit,
The portion of the shield member where the second plate member is provided is configured so that its shape can bend back toward the power transmitting unit when power is transmitted from the power transmitting unit to the power receiving unit.

According to the present invention, even if the power receiving unit is misaligned with respect to the power transmitting unit, it is possible to improve power receiving efficiency and/or reduce magnetic leakage.

1 is a diagram showing a schematic configuration of a contactless power transfer system 1. FIG. 10 is a schematic top view of the vehicle V stopped with the center position C2 of the power receiving unit 21 shifted rearward to the right relative to the center position C1 of the power transmitting unit 11. FIG. 10 is a schematic top view of a power receiving device 20 including plate members 25 and 27, in which a center position C2 of a power receiving unit 21 is shifted to the right rear side relative to a center position C1 of a power transmitting unit 11. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. 10 is a schematic top view of a power receiving device 20 including plate members 25 and 27, in which a center position C2 of a power receiving unit 21 is shifted rearward and leftward relative to a center position C1 of a power transmitting unit 11. FIG. 10 is a schematic top view of a power receiving device 20 including plate members 25 and 27, in which a center position C2 of a power receiving unit 21 is shifted to the left front side with respect to a center position C1 of a power transmitting unit 11. FIG. 10 is a schematic top view of a power receiving device 20 including plate members 25 and 27, in which a center position C2 of a power receiving unit 21 is shifted to the front right side with respect to a center position C1 of a power transmitting unit 11. FIG.

One embodiment of the present invention will be described below with reference to the accompanying drawings. In the following description, front, rear, left, right, and up and down will be described according to the direction as seen by the operator (driver) of the vehicle, and in the drawings, the front of the vehicle will be indicated as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D.

Figure 1 shows a contactless power transfer system 1 capable of transmitting power contactlessly between equipment installed on the ground, such as in a parking lot, and a vehicle V. Below, we will explain the case where power is transferred from the equipment to a vehicle V (i.e., contactless charging) as an example of contactless power transfer.

The contactless power transfer system 1 includes a power transmission device 10 installed on the ground and a power receiving device 20 installed in a vehicle V that receives power transmitted contactlessly from the power transmission device 10. The contactless power transfer system 1 supplies power from the power transmission device 10 to the power receiving device 20 using, for example, magnetic coupling between coils using a magnetic field resonance method or an electromagnetic induction method, or an electric field resonance method.

Vehicle V is an electric vehicle equipped with a battery BATT, such as a battery-powered electric vehicle or a plug-in hybrid vehicle. The power receiving device 20 receives power transmitted from the power transmitting device 10, and the battery BATT stores the power received by the power receiving device 20. The battery BATT is, for example, a lithium-ion battery or a nickel-metal hydride battery. Vehicle V is configured to run by driving a motor (not shown), which serves as a drive source, using the power stored in the battery BATT.

The power transmission device 10 includes a power transmission unit 11 that transmits AC power and a power supply unit 12 that is connected to an external power system such as a commercial power supply. The power transmission unit 11 is installed on the ground and covered with a pad or the like, and has a primary coil 11c that transmits AC power. The shape of the primary coil 11c is, for example, circular in plan view, but is not limited to this and may be oval, square, rectangular, etc.

The power receiving device 20 is provided under the floor of the vehicle V, and is attached to the vehicle body from below, for example. The power receiving device 20 includes a power receiving unit 21 that contactlessly receives AC power (hereinafter simply referred to as power) transmitted from the power transmitting unit 11, and a shielding member 22 provided around the power receiving unit 21.

The power receiving unit 21 is attached to the vehicle body while covered with a pad or the like, and has a secondary coil 21c that receives power transmitted from the power transmitting unit 11 in a non-contact manner. When the vehicle V is parked with the secondary coil 21c and primary coil 11c facing each other, AC power is supplied from the power supply unit 12 to the primary coil 11c, and power is transmitted non-contact from the primary coil 11c to the secondary coil 21c. The power received by the secondary coil 21c is rectified by a rectifier (not shown) and supplied to the battery BATT. The shape of the secondary coil 21c is, for example, circular in a plan view, but is not limited to this and may be elliptical, square, rectangular, etc.

The shield member 22 is a panel made of a conductive metal material, such as aluminum. The shield member 22 has a rectangular shape when viewed from above and below, and is positioned horizontally below the vehicle body. The shield member 22 has a fixed portion with respect to the vehicle body, for example, between the inner peripheral portion 22i and the outer peripheral portion 22o.

The shielding member 22 is provided around the power receiving unit 21. Specifically, the shielding member 22 has a central through-hole when viewed from the top-bottom direction, and the power receiving unit 21 is disposed in the through-hole of the shielding member 22. The through-hole has, for example, a rectangular shape when viewed from the top-bottom direction. During contactless power transmission, eddy currents are generated in the shielding member 22, which prevents the magnetic field from leaking outside between the power transmitting device 10 and the power receiving device 20.

In the contactless power transfer system 1, when the center position of the power transmission unit 11 (primary coil 11c) and the center position of the power receiving unit 21 (secondary coil 21c) are aligned in a top view, the coupling efficiency between the coils is maximized, and the power receiving efficiency of the power receiving unit 21 is maximized. On the other hand, when the center position of the power transmission unit 11 (primary coil 11c) and the center position of the power receiving unit 21 (secondary coil 21c) are misaligned in a top view, the coupling efficiency between the coils decreases, and the power receiving efficiency of the power receiving unit 21 decreases.

Figure 2 is a schematic top view of the vehicle V when it is stopped with the center position C2 of the power receiving unit 21 shifted to the rear right relative to the center position C1 of the power transmitting unit 11. The power transmission path from the power transmitting unit 11 to the power receiving unit 21 is primarily a linear path from the power transmitting unit 11 to the power receiving unit 21, with the power transmitting unit 11 and power receiving unit 21 overlapping in a top view, but there is also another path from the power transmitting unit 11 to the power receiving unit 21 via the shield member 22.

Explaining the transmission path from the power transmitter 11 to the power receiver 21 via the shield member 22, in the state shown in Figure 2, area A1 (the shaded area in Figure 2) including the right side, rear side, and rear left side of the inner circumferential portion 22i of the shield member 22 contributes to the transmission of power from the power transmitter 11 to the power receiver 21. Area A1 is a region relatively far from the center position C1 of the power transmitter 11, and includes the region on the opposite side of the center position C2 of the power receiver 21 from the center position C1 of the power transmitter 11. Note that in the front and front left areas of the inner circumferential portion 22i of the shield member 22, the magnetic fields generated by the power transmitter 11 and the power receiver 21 are in opposite directions and cancel each other out, so they do not contribute to the transmission of power.

Although area A1 on the inner periphery 22i of the shield member 22 contributes to the transmission of power to the power receiving unit 21, magnetic loss occurs in the shield member 22, and the power transmitted from this transmission path to the power receiving unit 21 is attenuated by the amount of magnetic loss.

As shown in Figures 3 and 4, the power receiving device 20 further includes a plate member 25 that is superimposed on the vehicle body side surface (i.e., the upper surface) of the inner periphery 22i of the shield member 22. Multiple plate members 25 are provided along the inner periphery 22i of the shield member 22. Specifically, eight plate members 25 are provided, with two on each of the right, rear, left, and front sides of the inner periphery 22i.

The plate member 25 is made of a metal material different from that of the shield member 22 and having a smaller thermal expansion coefficient than that of the shield member 22. The plate member 25 is made of, for example, steel. In other words, the inner peripheral portion 22i of the shield member 22 forms a bimetal structure in which the shield member 22 and the plate member 25, which are made of different metal materials, are stacked on top of each other.

The portion of the shielding member 22 where the plate member 25 is provided is configured to change shape when power is transmitted from the power transmitting unit 11 to the power receiving unit 21.

Specifically, during contactless power transmission, magnetic loss occurs in region A1 of shield member 22, which forms the power transmission path, causing the temperature of shield member 22 to rise. Because plate member 25 has a smaller thermal expansion coefficient than shield member 22 and is located on the vehicle body side, shield member 22 and plate member 25 in region A1 of inner periphery 22i passively deform (curve) toward the vehicle body due to the temperature rise.

Due to this deformation of the shield member 22 and the plate member 25, the magnetic field incident on the inner periphery 22i of the shield member 22 is reduced, and in the transmission path from the power transmitting unit 11 to the power receiving unit 21 via the shield member 22, power is transmitted from the shield member 22 to the power receiving unit 21 through the air without passing through the inner periphery 22i. In this way, magnetic loss in the shield member 22 is reduced, improving the power receiving efficiency of the power receiving unit 21. Furthermore, when not transmitting contactless power, for example, when the vehicle V is traveling, the deformation of the shield member 22 and the plate member 25 is eliminated and they return to their original state, so they are not affected by air resistance.

As mentioned above, areas other than area A1 on the inner circumferential portion 22i of the shield member 22, i.e., the front and front left areas of the inner circumferential portion 22i, do not contribute to power transmission to the power receiving unit 21, and the temperature rise in these areas is smaller than in area A1. Therefore, the shield member 22 and plate member 25 in these areas do not warp toward the vehicle body, or the amount of warping is small. Therefore, magnetic field leakage in these areas can be suppressed.

Next, other examples of misalignment of the power receiving unit 21 relative to the power transmitting unit 11 will be similarly described with reference to Figures 5 to 7.

Figure 5 is a schematic top view of the vehicle V when it is stopped with the center position C2 of the power receiving unit 21 misaligned to the left rear relative to the center position C1 of the power transmitting unit 11. In the state shown in Figure 5, area A2 of the inner circumferential portion 22i of the shield member 22, including the left side, rear side, and right rear portion, contributes to the transmission of power from the power transmitting unit 11 to the power receiving unit 21. During contactless power transmission, magnetic loss occurs in area A2 of the shield member 22, which serves as the power transmission path, causing the temperature of the shield member 22 to rise. The shield member 22 and plate member 25 in area A2 of the inner circumferential portion 22i then passively deform by warping toward the vehicle body due to the temperature rise.

Figure 6 is a schematic top view of the vehicle V when it is stopped with the center position C2 of the power receiving unit 21 misaligned to the left front with respect to the center position C1 of the power transmitting unit 11. In the state shown in Figure 6, area A3 of the inner circumferential portion 22i of the shield member 22, including the left side, front side, and front right side, contributes to the transmission of power from the power transmitting unit 11 to the power receiving unit 21. During contactless power transmission, magnetic loss occurs in area A3 of the shield member 22, which serves as the power transmission path, causing the temperature of the shield member 22 to rise. The shield member 22 and plate member 25 in area A3 of the inner circumferential portion 22i then passively deform and warp toward the vehicle body due to the temperature rise.

Figure 7 is a schematic top view of the vehicle V when it is stopped with the center position C2 of the power receiving unit 21 misaligned to the left front with respect to the center position C1 of the power transmitting unit 11. In the state shown in Figure 7, area A4 of the inner circumferential portion 22i of the shield member 22, including the right side, front side, and front left side, contributes to the transmission of power from the power transmitting unit 11 to the power receiving unit 21. During contactless power transmission, magnetic loss occurs in area A4 of the shield member 22, which serves as the power transmission path, causing the temperature of the shield member 22 to rise. The shield member 22 and plate member 25 in area A4 of the inner circumferential portion 22i then passively deform by warping toward the vehicle body due to the temperature rise.

In this way, with the power receiving device 20 having the plate member 25 placed on top of the shield member 22, even when contactless power transmission is performed with the power receiving unit 21 misaligned relative to the power transmitting unit 11, the shield member 22 and plate member 25 in the area contributing to power transmission deform passively, eliminating the need to deform the shield member 22 using an actuator or the like in response to the misalignment.

Furthermore, multiple slits 22s are formed in the inner periphery 22i of the shield member 22, and plate members 25 are provided between adjacent slits 22s. Providing the slits 22s makes it easier to partially deform areas of the shield member 22 that require deformation. For example, in the example shown in Figure 3, slits 22s are provided between two plate members 25 provided on the left side of the inner periphery 22i of the shield member 22, and of these two plate members 25, only the plate member 25 provided in region A1 can be partially deformed.

Returning to Figure 2, we will explain the leakage of magnetic field outside the shield member 22 during contactless power transmission.

In the state shown in Figure 2, the center position C2 of the power receiving unit 21 is misaligned to the rear right with respect to the center position C1 of the power transmitting unit 11, which means that there is a risk that the electromagnetic field will leak outside the power receiving device 20 from the front region B1 (hatched area in Figure 2) of the outer periphery 22o of the shielding member 22. In other words, if the power receiving unit 21 is misaligned with the power transmitting unit 11 during contactless power transmission, there is a risk that the electromagnetic field will leak outside the power receiving device 20 via a position on the outer periphery 22o of the shielding member 22 that is close to the center position C1 of the power transmitting unit 11 (here, the front region B).

As shown in Figures 3 and 4, the power receiving device 20 further includes a plate member 27 that is provided on the outer peripheral portion 22o of the shield member 22, overlapping the surface facing the power transmitting unit 11 (i.e., the lower surface). In this embodiment, multiple plate members 27 are provided along the outer peripheral portion 22o of the shield member 22. Specifically, four plate members 27 are provided, one each on the right, rear, left, and front sides of the outer peripheral portion 22o.

The plate member 27 is made of a metal material different from that of the shield member 22 and having a smaller thermal expansion coefficient than that of the shield member 22. The plate member 27 is made of, for example, steel. In other words, the outer periphery 22o of the plate member 27 forms a bimetal structure in which the shield member 22 and the plate member 27, which are made of different metal materials, overlap each other.

The portion of the shielding member 22 where the plate member 27 is provided is configured to change shape when power is transmitted from the power transmitting unit 11 to the power receiving unit 21.

Specifically, during contactless power transmission, magnetic loss occurs in region B1 of shield member 22, which forms the power transmission path, causing the temperature of shield member 22 to rise. Because plate member 27 has a smaller thermal expansion coefficient than shield member 22 and is located on the power transmission unit 11 side, shield member 22 and plate member 27 in region B1 of outer periphery 22o passively deform and warp toward power transmission unit 11 due to the temperature rise.

Due to this deformation of the shield member 22 and the plate member 27, the magnetic field incident on the region B1 of the outer periphery 22o of the shield member 22 increases, increasing magnetic loss in the shield member 22. This prevents the magnetic field from leaking from the region B1 of the outer periphery 22o of the shield member 22 to the outside of the power receiving device 20. Furthermore, when not transmitting contactless power, for example, when the vehicle V is traveling, the deformation of the shield member 22 and the plate member 27 disappears and returns to their original state, so they are not affected by air resistance.

Next, other examples of misalignment of the power receiving unit 21 relative to the power transmitting unit 11 will be similarly described with reference to Figures 5 to 7 described above.

In the state shown in Figure 5, similar to the state shown in Figure 3, the front region B1 of the outer periphery 22o of the shield member 22 is closer to the center position C1 of the power transmission unit 11 than other regions. During contactless power transmission, magnetic loss occurs in region B1 of the shield member 22, causing the temperature of the shield member 22 to rise. The shield member 22 and plate member 27 in region B1 of the outer periphery 22o are then passively deformed by warping toward the power transmission unit 11 due to the temperature rise.

In the state shown in Figures 6 and 7, the rear region B2 of the outer periphery 22o of the shield member 22 is closer to the center position C1 of the power transmission unit 11 than other regions. During contactless power transmission, magnetic loss occurs in region B2 of the shield member 22, causing the temperature of the shield member 22 to rise. The shield member 22 and plate member 27 in region B2 of the outer periphery 22o passively deform by warping toward the power transmission unit 11 due to the temperature rise.

In this way, with a power receiving device 20 including a plate member 27 placed over the shield member 22, even when contactless power transmission is performed with the power receiving unit 21 misaligned relative to the power transmitting unit 11, the shield member 22 and plate member 27 passively deform in areas where there is a high probability of magnetic field leakage to the outside of the power receiving device 20, eliminating the need to deform the shield member 22 using an actuator or the like in response to the misalignment.

Furthermore, multiple slits 22s may be formed in the outer peripheral portion 22o of the shield member 22, similar to the inner peripheral portion 22i, and a plate member 27 may be provided between adjacent slits 22s.

Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art could conceive of various modifications or alterations within the scope of the claims, and it is understood that these naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner as long as they do not deviate from the spirit of the invention.

For example, in the above-described embodiment, plate members 25, 27 are provided on both the inner peripheral portion 22i and the outer peripheral portion 22o of the shield member 22, respectively. However, this is not limited to this, and the plate members 25, 27 may be provided on only one of the inner peripheral portion 22i and the outer peripheral portion 22o of the shield member 22.

In addition, in the above-described embodiment, eight plate members 25 are provided on the inner peripheral portion 22i of the shield member 22, but the number of plate members 25 is not limited to this and can be set as desired. In addition, four plate members 27 are provided on the outer peripheral portion 22o of the shield member 22, but the number of plate members 27 is not limited to this and can be set as desired.

This specification describes at least the following. The components corresponding to the above-mentioned embodiments are shown in parentheses as examples, but are not limited to these.

(1) a power receiving unit (power receiving unit 21) attached to a vehicle body and capable of receiving power transmitted in a wireless manner from a power transmitting unit (power transmitting unit 11) installed outside the vehicle;
a shield member (shield member 22) provided around the power receiving portion;
a plate member (plate members 25, 27) formed of a material different from the shielding member and provided to overlap at least one of an inner peripheral portion (inner peripheral portion 22i) and an outer peripheral portion (outer peripheral portion 22o) of the shielding member,
a portion of the shield member where the plate member is provided is configured to be variable in shape when power is transmitted from the power transmitting unit to the power receiving unit;
Non-contact power receiving device.

According to (1), even if the power receiving unit is misaligned with the power transmitting unit during contactless power transmission, the power receiving efficiency at the power receiving unit can be improved by deforming the shielding member using thermal expansion due to magnetic loss that occurs in the portion of the inner periphery of the shielding member where the plate member is provided. Furthermore, by deforming the shielding member using thermal expansion due to magnetic loss that occurs in the portion of the outer periphery of the shielding member where the plate member is provided, it is possible to reduce leakage of the electromagnetic field outside the shielding member.

(2) The contactless power receiving device according to (1),
the plate member includes a first plate member (plate member 25) provided on the inner peripheral portion of the shield member and on a surface of the shield member facing the vehicle body,
a portion of the shield member where the first plate member is provided is configured to be able to bend toward the vehicle body when power is transmitted from the power transmitting unit to the power receiving unit;
Non-contact power receiving device.

According to (2), even if the power receiving unit is misaligned with the power transmitting unit during contactless power transmission, the portion of the shielding member where the first plate member is provided will warp and deform toward the vehicle body, thereby reducing magnetic loss at the inner periphery of the shielding member and improving power receiving efficiency.

(3) The contactless power receiving device according to (1) or (2),
the plate member includes a second plate member (plate member 27) provided on the outer circumferential portion of the shield member and on a surface of the shield member facing the power transmission unit,
a portion of the shield member where the second plate member is provided is configured so that its shape can bend toward the power transmitting unit when power is transmitted from the power transmitting unit to the power receiving unit;
Non-contact power receiving device.

According to (3), even if the power receiving unit is misaligned with the power transmitting unit during contactless power transmission, the portion of the shielding member where the second plate member is provided will warp and deform toward the power transmitting unit, increasing magnetic loss at the outer periphery of the shielding member and reducing leakage of the electromagnetic field outside the shielding member.

(4) The contactless power receiving device according to any one of (1) to (3),
The shield member is formed of a metal material,
the plate member is formed of a metal material having a different thermal expansion coefficient from that of the shield member;
Non-contact power receiving device.

According to (4), by forming a bimetal on the inner and/or outer periphery of the shielding member, the shielding member can be deformed.

(5) The contactless power receiving device according to any one of (1) to (4),
A plurality of slits (slits 22s) are formed in at least one of the inner peripheral portion and the outer peripheral portion of the shielding member,
The plate member is provided between adjacent slits.
Non-contact power receiving device.

According to (5), the plate member is provided between adjacent slits, so that the shield member can be partially deformed in areas where deformation is required.

(6) The contactless power receiving device according to any one of (1) to (5),
The plate member is provided overlapping the inner peripheral portion and the outer peripheral portion of the shield member.
Non-contact power receiving device.

According to (6), plate members are provided on both the inner and outer periphery of the shield member, which improves power receiving efficiency and reduces magnetic leakage.

11 Power transmission unit 20 Power receiving device (non-contact power receiving device)
21 Power receiving portion 22 Shield member 22i Inner peripheral portion 22o Outer peripheral portion 22s Slit 25 Plate member (first plate member)
27 Plate member (second plate member)

Claims (5)

a power receiving unit attached to the vehicle body and capable of receiving power transmitted in a non-contact manner from a power transmitting unit installed outside the vehicle;
a shielding member provided around the power receiving portion;
a plate member formed of a material different from the shielding member and provided to overlap at least one of an inner circumferential portion and an outer circumferential portion of the shielding member,
the plate member includes a first plate member provided on the inner circumferential portion of the shield member and on a surface of the shield member facing the vehicle body,
a portion of the shield member where the first plate member is provided is configured to be able to bend toward the vehicle body when power is transmitted from the power transmitting unit to the power receiving unit;
Non-contact power receiving device. a power receiving unit attached to the vehicle body and capable of receiving power transmitted in a non-contact manner from a power transmitting unit installed outside the vehicle;
a shielding member provided around the power receiving portion;
a plate member formed of a material different from the shielding member and provided to overlap at least one of an inner circumferential portion and an outer circumferential portion of the shielding member,
the plate member includes a second plate member provided on the outer circumferential portion of the shield member and on a surface of the shield member facing the power transmission unit,
a portion of the shield member where the second plate member is provided is configured so that its shape can bend toward the power transmitting unit when power is transmitted from the power transmitting unit to the power receiving unit;
Non-contact power receiving device. The contactless power receiving device according to claim 1 or 2 ,
The shield member is formed of a metal material,
the plate member is formed of a metal material having a different thermal expansion coefficient from that of the shield member;
Non-contact power receiving device. The contactless power receiving device according to claim 1 or 2 ,
a plurality of slits are formed in at least one of the inner peripheral portion and the outer peripheral portion of the shield member,
The plate member is provided between adjacent slits.
Non-contact power receiving device. The contactless power receiving device according to claim 1 or 2 ,
The plate member is provided to overlap the inner peripheral portion and the outer peripheral portion of the shield member.
Non-contact power receiving device.