Multiple interleaved coil structures for wireless power transfer

• US 10,263,471 B2
• Filed: 03/28/2016
• Issued: 04/16/2019
• Est. Priority Date: 03/29/2015
• Status: Active Grant

• Current Assignee: ChargEdge, Inc.
• Original Assignee: ChargEdge, Inc.
• Inventors: Maniktala, Sanjaya
• Primary Examiner(s): Tra, Anh Q
• Application Number:
  US15/082,672
• Publication Number:
  US 20160285318A1
• Time in Patent Office: 1,114 Days
• Field of Search: 307104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas

Abstract

In one embodiment, a multiple interleaved coil structure for wireless power transfer includes a plurality of incomplete coils, each of the plurality of incomplete coils configured such that an alternating current flowing in the incomplete coil produces a magnetic field, and at least one interconnect between the plurality of incomplete coils, the at least one interconnect including a plurality of conductors arranged in such a way that the alternating current flowing in the plurality of conductors does not produce a magnetic field. Each of the plurality of incomplete coils includes a plurality of non-contiguous segments arranged in such a way that the incomplete coil will emit magnetic flux in response to an applied alternating current. The multiple interleaved coil structure can be implemented in a wireless power transmitter or a wireless power receiver.

Claims

1. A coil structure comprising:

a first plurality of wires formed in a first direction and a first section of the coil structure, comprising;

a plurality of first wire segments disposed in a first region of the coil structure, wherein the plurality of first wire segments are disposed parallel to each other;

a plurality of second wire segments formed in a second region of the coil structure, wherein the plurality of second wire segments are disposed parallel to each other;

a plurality of first interconnection wire segments disposed in a fifth region of the coil structure between the first region and the second region and electrically connect the plurality of first wire segments and the plurality of second wire segments, respectively; and

a second plurality of wires disposed in a second direction and in a second section of the coil structure, comprising;

a plurality of third wire segments deposed in a third region of the coil structure, wherein the plurality of third wire segments are disposed parallel to each other;

a plurality of fourth wire segments formed in a fourth region of the coil structure, wherein the plurality of fourth wire segments are disposed parallel to each other;

a plurality of second interconnection wire segments disposed in a sixth region of the coil structure between the third region and the fourth region and electrically connect the plurality of third wire segments and the plurality of fourth wire segments, respectively;

wherein,

the plurality of first wire segments, the plurality of second wire segments, the plurality of third wire segments, and the plurality of fourth wire segments each are substantially arc shaped, and

the first section opposes the second section in a direction other than the first direction and the second direction.

2. The coil structure of claim 1, wherein the first plurality of wires and the second plurality of wires are coupled to a circuit configured to provide an alternating current to the first plurality of wires and the second plurality of wires to cause each of the first plurality of wires and each of the second plurality of wires to emit magnetic flux.

3. The coil structure of claim 1, wherein the plurality of first wire segments and the plurality of second wire segments are coupled to a circuit configured to rectify an alternating current induced in at least one wire segment of the plurality of first wire segments and the plurality of second wire segments by magnetic flux.

4. The coil structure of claim 1, wherein an alternating current flows in a clockwise direction within the plurality of first wires segments and flows in a counter-clockwise direction within the plurality of second wire segments.

5. The coil structure of claim 1, wherein the first plurality of wires and the second plurality of wires are formed of a single continuous wire.

6. The coil structure of claim 1, further comprising:

a magnetic layer configured to magnetically couple together at least the plurality of first wire segments and the plurality of third wire segments with at least the plurality of second wire segments and the plurality of fourth wire segments.

7. The coil structure of claim 1, wherein the only produced magnetic field from the coil structure is relative to the plurality of first wire segments, the plurality of second wire segments, the plurality of third wire segments, and the plurality of fourth wire segments.

8. The coil structure of claim 1, wherein a magnetic field produced relative to the plurality of first interconnection wire segments and the plurality of second interconnection segments is minimized.

9. A coil structure comprising:

a plurality of coil arrays coupled together in a series, each of the plurality of coil arrays comprising;

a first plurality of wires formed in a first direction and a first section of the coil structure, comprising;

a plurality of first wire segments disposed in a first region of the coil structure, wherein the plurality of first wire segments are disposed parallel to each other;

a plurality of second wire segments formed in a second region of the coil structure, wherein the plurality of second wire segments are disposed parallel to each other;

a plurality of first interconnection wire segments disposed in a fifth region of the coil structure between the first region and the second region and electrically connect the plurality of first wire segments and the plurality of second wire segments, respectively; and

a second plurality of wires disposed in a second direction and in a second section of the coil structure, comprising;

a plurality of third wire segments deposed in a third region of the coil structure, wherein the plurality of third wire segments are disposed parallel to each other;

a plurality of fourth wire segments formed in a fourth region of the coil structure, wherein the plurality of fourth wire segments are disposed parallel to each other;

a plurality of second interconnection wire segments disposed in a sixth region of the coil structure between the third region and the fourth region and electrically connect the plurality of third wire segments and the plurality of fourth wire segments, respectively;

wherein,

the plurality of first wire segments, the plurality of second wire segments, the plurality of third wire segments, and the plurality of fourth wire segments each are substantially arc shaped, and

the first section opposes the second section in a direction other than the first direction and the second direction.

10. The coil structure of claim 9, wherein the plurality of coil arrays is coupled to a circuit configured to provide an alternating current to the plurality of coil arrays to cause each of the first plurality of wires and each of the second plurality of wires to emit magnetic flux.

11. The coil structure of claim 10, wherein the plurality of coil arrays is coupled to a circuit configured to rectify an alternating current induced in at least one wire segment of the plurality of first wire segments and the plurality of second wire segments by magnetic flux.

12. The coil structure of claim 10, wherein an alternating current flows in a clockwise direction within the plurality of first wire segments and flows in a counter-clockwise direction within the plurality of second wire segments.

13. The coil structure of claim 9, wherein the first plurality of wires and the second plurality of wires are formed of a single continuous wire.

14. The coil structure of claim 10, further comprising:

a plurality of magnetic layers, a magnetic layer in the plurality of magnetic layers configured to magnetically couple together at least the plurality of first wire segments and the plurality of third wire segments with at least the plurality of second wire segments and the plurality of fourth wire segments.

15. The coil structure of claim 10, further comprising an air gap between each of the plurality of magnetic layers and another one of the plurality of magnetic layers.

16. The coil structure of claim 10, wherein the only produced magnetic field from the coil structure is relative to the plurality of first wire segments, the plurality of second wire segments, the plurality of third wire segments, and the plurality of fourth wire segments.

17. The coil structure of claim 10, wherein a magnetic field produced relative to the plurality of first interconnection wire segments and the plurality of second interconnection segments is minimized.