Power receiving apparatus with a plurality of resonance coils

• US 10,090,710 B2
• Filed: 07/22/2014
• Issued: 10/02/2018
• Est. Priority Date: 01/27/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Uchida, Akiyoshi
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Warmflash, Michael
• Application Number:
  US14/337,302
• Publication Number:
  US 20140333148A1
• Time in Patent Office: 1,533 Days
• Field of Search: 307104, 320108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A power receiving apparatus includes a plurality of resonance coils, a power receiving circuit, and a single wire configured to start at a first terminal of the power receiving circuit and to end at a second terminal of the power receiving circuit, the single wire forming one coil or a plurality of coils connected in series, wherein the one coil or the plurality of coils connected in series and the plurality of resonance coils are placed such that the one coil or the plurality of coils connected in series are couplable to the plurality of resonance coils.

Claims

1. A power receiving apparatus, comprising:

a plurality of resonance coils;

a power receiving circuit; and

a single wire configured to start at a first terminal of the power receiving circuit and to end at a second terminal of the power receiving circuit, the single wire forming a plurality of coils connected in series,

wherein the plurality of coils connected in series and the plurality of resonance coils are placed such that the plurality of coils connected in series are coupleable to the plurality of resonance coils,

wherein each of the plurality of coils connected in series is configured to overlap a corresponding one of the plurality of resonance coils, and

wherein the plurality of resonance coils are disposed at respective, different positions in the power receiving apparatus, and axes of the resonance coils are oriented at different angles.

2. The power receiving apparatus as claimed in claim 1, further comprising:

a core circuit; and

a plurality of magnetic shields disposed between the plurality of resonance coils and the core circuit, respectively.

3. The power receiving apparatus as claimed in claim 1, wherein the power receiving circuit is a rectifying circuit.

4. The power receiving apparatus as claimed in claim 1, wherein the different angles are spaced at constant intervals over a full 360-degree range.

5. A power transmission system, comprising:

a power transmission apparatus; and

a power receiving apparatus configured to receive power from the power transmission apparatus via magnetic resonance,

wherein the power receiving apparatus includes;

a plurality of resonance coils;

a power receiving circuit; and

a single wire configured to start at a first terminal of the power receiving circuit and to end at a second terminal of the power receiving circuit, the single wire forming a plurality of coils connected in series,

wherein the plurality of coils connected in series and the plurality of resonance coils are placed such that the plurality of coils connected in series are coupleable to the plurality of resonance coils,

wherein each of the plurality of coils connected in series is configured to overlap a corresponding one of the plurality of resonance coils, and

wherein the plurality of resonance coils are disposed at respective, different positions in the power receiving apparatus, and axes of the resonance coils are oriented at different angles.

6. The power transmission system as claimed in claim 5, wherein the power receiving apparatus further includes:

a core circuit; and

a plurality of magnetic shields disposed between the plurality of resonance coils and the core circuit, respectively.

7. The power transmission system as claimed in claim 5, wherein the different angles are spaced at constant intervals over a full 360-degree range.

8. A power transmission method, comprising:

supplying alternating-current power to a transmission-side resonance coil;

receiving power from the transmission-side resonance coil via electromagnetic induction with a plurality of reception-side resonance coils that are disposed at respective, different positions, axes of the reception-side resonance coils being oriented at different angles;

magnetically coupling the plurality of reception-side resonance coils with a single wire that forms a plurality of coils connected in series, each of the plurality of coils connected in series being configured to overlap a corresponding one of the plurality of reception-side resonance coils; and

supplying power from the single wire to a power receiving circuit.

9. The power transmission method as claimed in claim 8, wherein the different angles are spaced at constant intervals over a full 360-degree range.