WIRELESS POWER TRANSMISSION SYSTEM, POWER TRANSMITTING DEVICE, AND POWER RECEIVING DEVICE

• US 20130264864A1
• Filed: 03/12/2013
• Published: 10/10/2013
• Est. Priority Date: 04/10/2012
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: KANNO, Hiroshi
• Granted Patent: US 9,349,530 B2
• Time in Patent Office: Days
• US Class Current: 307/9.1
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A wireless power transmission system as an embodiment of the present disclosure transmits electric power by a non-contact method from a first inductor to a second inductor, or vice versa, via resonant magnetic coupling. The wireless power transmission system includes: the first inductor that has a center hole; the second inductor that is spaced apart from the first inductor and that is smaller in size than the hole of the first inductor; and a magnetic body member that is arranged on one side of the first inductor so as to face the second inductor and that covers at least a part of the first inductor. That at least a part of the first inductor reaches an outer edge of the first inductor from an inner edge thereof.

Claims

1. A wireless power transmission system configured to transmit electric power by a non-contact method from a first inductor to a second inductor, or vice versa, via resonant magnetic coupling, the system comprising:

the first inductor that has a center hole;

the second inductor that is spaced apart from the first inductor and that is smaller in size than the hole of the first inductor; and

a magnetic body member that is arranged on one side of the first inductor so as to face the second inductor and that covers at least a part of the first inductor, that at least a part of the first inductor reaching an outer edge of the first inductor from an inner edge thereof.

2. The wireless power transmission system of claim 1, wherein the magnetic body member covers the first inductor entirely.

3. The wireless power transmission system of claim 1, wherein the magnetic body member covers the first inductor only partially.

4. The wireless power transmission system of claim 2, wherein the magnetic body member includes a plurality of parts, each of which covers the first inductor from its inner edge through its outer edge.

5. The wireless power transmission system of claim 1, wherein the magnetic body member includes a portion that extends from the inner edge of the first inductor toward the center of the hole and a portion that extends outside of the first inductor from the outer edge of the second inductor.

6. The wireless power transmission system of claim 1, wherein the magnetic body member has a center hole that is larger in size than the second inductor.

7. The wireless power transmission system of claim 1, wherein the magnetic body member has a portion that faces at least one of the inner and outer edge side surfaces of the first inductor.

8. The wireless power transmission system of claim 7, wherein the magnetic body member encloses the first inductor.

9. The wireless power transmission system of claim 1, wherein the second inductor is built in an electric vehicle.

10. The wireless power transmission system of claim 1, wherein the first inductor is embedded in a road.

11. The wireless power transmission system of claim 1, wherein the size of the first inductor is larger when measured in a first direction than when measured perpendicularly to the first direction.

21. A power receiving device for use in the wireless power transmission system of claim 1, the power receiving device comprising one of the first and second inductors that receives power.

12. A power transmitting device for use in a wireless power transmission system that is configured to transmit electric power by a non-contact method from a first inductor to a second inductor, or vice versa, via resonant magnetic coupling, the device comprising:

the first inductor that is spaced apart from the second inductor and that has a center hole that is larger in size than the second inductor; and

a magnetic body member that is arranged on one side of the first inductor so as to face the second inductor and that covers at least a part of the first inductor, that at least a part of the first inductor reaching an outer edge of the first inductor from an inner edge thereof.

13. The power transmitting device of claim 12, wherein the magnetic body member covers the first inductor entirely.

14. The power transmitting device of claim 12, wherein the magnetic body member covers the first inductor only partially.

15. The power transmitting device of claim 12, wherein the magnetic body member includes a plurality of parts, each of which covers the first inductor from its inner edge through its outer edge.

16. The power transmitting device of claim 12, wherein the magnetic body member includes a portion that extends from the inner edge of the first inductor toward the center of the hole and a portion that extends outside of the first inductor from the outer edge of the first inductor.

17. The power transmitting device of claim 12, wherein the magnetic body member includes an additional portion that faces at least one of the inner and outer edge side surfaces of the first inductor.

18. The power transmitting device of claim 17, wherein the magnetic body member encloses the first inductor.

19. The power transmitting device of claim 12, wherein the first inductor is embedded in a road.

20. The power transmitting device of claim 12, wherein the size of the first inductor is larger when measured in a first direction than when measured perpendicularly to the first direction.