WIRELESS POWER TRANSMISSION APPARATUS

• US 20140312705A1
• Filed: 05/01/2013
• Published: 10/23/2014
• Est. Priority Date: 04/17/2012
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hatanaka, Takezo, Tsuda, Hisashi
• Granted Patent: US 9,755,698 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: H04B 5/79 for data transfer in combination with power transfer

Abstract

A power-supplying module and a power-receiving module are positioned so that a coil surface of a power-supplying resonator in the power-supplying module and a coil surface of a power-receiving resonator in the power-receiving module face each other. On the inner circumferential surface sides of the coils of the power-supplying resonator and the power-receiving resonator, cylindrical magnetic members and which cover the entire inner circumferential surfaces of the coil of the power-supplying resonator and the coil of the power-receiving resonator are arranged. When power transmission between the power-supplying resonator and the power-receiving resonator is performed, while varying the magnetic field, magnetic field occurring around the power-supplying resonator and the power-receiving resonator is shielded by the magnetic members. This improves power transmission efficiency of power transmitted from the power-supplying module to the power-receiving module, as compared with a case of arranging no magnetic members.

Claims

1. A wireless power transmission apparatus configured to perform power transmission by varying a magnetic field between a power-supplying module and a power-receiving module, wherein

the power-supplying module and the power-receiving module comprise:

coils; and

a magnetic member which covers at least partially one or more surfaces of the coils of the power-supplying module or one of the coils of the power-receiving module, except for a surface facing a surface of another one of the coils.

2. A wireless power transmission apparatus according to claim 1, wherein the magnetic member is arranged so as to cover an inner circumferential surface of the one of the coils of the power-supplying module and/or the one of the coils of the power-receiving module.

3. A wireless power transmission apparatus according to claim 1, wherein the magnetic member is arranged so as to cover an outer circumferential surface of the one of the coils of the power-supplying module and/or the one of the coils of the power-receiving module.

4. A wireless power transmission apparatus according to claim 1, wherein the magnetic member is arranged on a surface of the one of the coils, which surface is opposite to the surface facing the other one of the coils in the power-supplying module or the power-receiving module.

5. A wireless power transmission apparatus according to claim 1, wherein power transmission is performed from the coils of the power-supplying module to the coils of the power-receiving module, by causing resonance between these coils.

6. A wireless power transmission apparatus according to claim 5, wherein

the coils in the power-supplying module are a power-supplying coil and a power-supplying resonator;

the coils of the power-receiving module are a power-receiving coil and a power-receiving resonator;

power feeded to the power-supplying coil is feeded to the power-supplying resonator by means of electromagnetic induction, the power feeded to the power-supplying resonator is transmitted as a magnetic field energy from the power-supplying resonator to the power-receiving resonator by having the power-supplying resonator resonating with the power-receiving resonator, and the power transmitted to the power-receiving resonator is fed to the power-receiving coil by means of electromagnetic induction, thereby performing power transmission.

7. A wireless power transmission apparatus according to claim 2, wherein the magnetic member is arranged so as to cover an outer circumferential surface of the one of the coils of the power-supplying module and/or the one of the coils of the power-receiving module.

8. A wireless power transmission apparatus according to claim 2, wherein the magnetic member is arranged on a surface of the one of the coils, which surface is opposite to the surface facing the other one of the coils in the power-supplying module or the power-receiving module.

9. A wireless power transmission apparatus according to claim 3, wherein the magnetic member is arranged on a surface of the one of the coils, which surface is opposite to the surface facing the other one of the coils in the power-supplying module or the power-receiving module.

10. A wireless power transmission apparatus according to claim 2, wherein power transmission is performed from the coils of the power-supplying module to the coils of the power-receiving module, by causing resonance between these coils.

11. A wireless power transmission apparatus according to claim 3, wherein power transmission is performed from the coils of the power-supplying module to the coils of the power-receiving module, by causing resonance between these coils.

12. A wireless power transmission apparatus according to claim 4, wherein power transmission is performed from the coils of the power-supplying module to the coils of the power-receiving module, by causing resonance between these coils.

13. A wireless power transmission apparatus according to claim 10, wherein

the coils in the power-supplying module are a power-supplying coil and a power-supplying resonator;

the coils of the power-receiving module are a power-receiving coil and a power-receiving resonator;

power feeded to the power-supplying coil is feeded to the power-supplying resonator by means of electromagnetic induction, the power feeded to the power-supplying resonator is transmitted as a magnetic field energy from the power-supplying resonator to the power-receiving resonator by having the power-supplying resonator resonating with the power-receiving resonator, and the power transmitted to the power-receiving resonator is fed to the power-receiving coil by means of electromagnetic induction, thereby performing power transmission.

14. A wireless power transmission apparatus according to claim 11, wherein

the coils in the power-supplying module are a power-supplying coil and a power-supplying resonator;

the coils of the power-receiving module are a power-receiving coil and a power-receiving resonator;

power feeded to the power-supplying coil is feeded to the power-supplying resonator by means of electromagnetic induction, the power feeded to the power-supplying resonator is transmitted as a magnetic field energy from the power-supplying resonator to the power-receiving resonator by having the power-supplying resonator resonating with the power-receiving resonator, and the power transmitted to the power-receiving resonator is fed to the power-receiving coil by means of electromagnetic induction, thereby performing power transmission.

15. A wireless power transmission apparatus according to claim 12, wherein

the coils in the power-supplying module are a power-supplying coil and a power-supplying resonator;

the coils of the power-receiving module are a power-receiving coil and a power-receiving resonator;

power feeded to the power-supplying coil is feeded to the power-supplying resonator by means of electromagnetic induction, the power feeded to the power-supplying resonator is transmitted as a magnetic field energy from the power-supplying resonator to the power-receiving resonator by having the power-supplying resonator resonating with the power-receiving resonator, and the power transmitted to the power-receiving resonator is fed to the power-receiving coil by means of electromagnetic induction, thereby performing power transmission.