WIRELESS POWER TRANSMITTING DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20120212069A1
• Filed: 01/25/2012
• Published: 08/23/2012
• Est. Priority Date: 02/17/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Matsui, Kiyoto, Taguchi, Masakazu, Shimokawa, Satoshi, Uchida, Akiyoshi, KAWANO, Hiroyasu
• Granted Patent: US 9,130,386 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A wireless power transmitting device includes a housing configured to have a feeding surface on which a power receiving device is to be placed; a power transmitting coil disposed inside the housing and configured to have a central axis that intersects with the feeding surface; and an alternating-current power supply configured to supply power to the power transmitting coil, wherein the feeding surface has raised and recessed portions in an area corresponding to a region inside an outer region of the power transmitting coil.

Claims

1. A wireless power transmitting device comprising:

a housing configured to have a feeding surface on which a power receiving device is to be placed;

a power transmitting coil disposed inside the housing and configured to have a central axis that intersects with the feeding surface; and

an alternating-current power supply configured to supply power to the power transmitting coil,

wherein the feeding surface has raised and recessed portions in an area corresponding to a region inside an outer region of the power transmitting coil.

2. The wireless power transmitting device according to claim 1, wherein the power transmitting coil includes

a primary coil to which an alternating current is supplied from the alternating-current power supply, and

a secondary coil configured to form a resonant circuit and magnetically connected to the primary coil.

3. The wireless power transmitting device according to claim 1, wherein the power transmitting coil is a planar spiral coil.

4. The wireless power transmitting device according to claim 1, wherein the feeding surface has the raised and recessed portions corresponding to an equal power plane that connects points at which power transmitted from the power transmitting coil is the same.

5. The wireless power transmitting device according to claim 1, wherein the raised portion of the feeding surface is located above coil wires of the power transmitting coil.

6. The wireless power transmitting device according to claim 1, wherein the feeding surface has an inclined portion located above coil wires of the power transmitting coil and inclined downward toward the outside.

7. A wireless power transmission system comprising:

a power transmitting device including

an alternating-current power supply,

a power transmitting coil to which power is supplied from the alternating-current power supply, and

a feeding surface;

a power receiving device configured to be placed on the feeding surface of the power transmitting device, the power receiving device including

a power receiving coil configured to resonate with a magnetic field produced by the power transmitting coil of the power transmitting device; and

raised and recessed portions formed in the feeding surface of the power transmitting device, the raised and recessed portions being located in an area corresponding to a region inside an outer region of the power transmitting coil.

8. The wireless power transmission system according to claim 7, wherein the power transmitting coil is larger in diameter than the power receiving coil.

9. The wireless power transmission system according to claim 7, wherein the power transmitting coil includes

a primary coil to which power is supplied from the alternating-current power supply, and

a secondary coil configured to form a resonant circuit and magnetically connected to the primary coil;

and

the power receiving coil includes

a third coil configured to form a resonant circuit that resonates with a magnetic field produced by the secondary coil, and

a fourth coil magnetically connected to the third coil.

10. The wireless power transmission system according to claim 7, wherein at least one of the power transmitting device and the power receiving device includes a vibrator that generates vibration when the power receiving device is placed on the feeding surface of the power transmitting device.