Multiple Interleaved Coil Structures for Wireless Power Transfer

• US 20160285318A1
• Filed: 03/28/2016
• Published: 09/29/2016
• Est. Priority Date: 03/29/2015
• Status: Active Grant

• Current Assignee: ChargEdge, Inc.
• Original Assignee: ChargEdge, Inc.
• Inventors: Maniktala, Sanjaya
• Granted Patent: US 10,263,471 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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.

2. The coil structure of claim 1, wherein the plurality of incomplete coils is coupled to a circuit configured to provide an alternating current to the plurality of incomplete coils to cause each of the plurality of incomplete coils to emit magnetic flux.

3. The coil structure of claim 1, wherein the plurality of incomplete coils is coupled to a circuit configured to rectify an alternating current induced in at least one of the plurality of incomplete coils by magnetic flux.

4. The coil structure of claim 1, wherein at least a first one of the plurality of incomplete coils is coupled by the least one interconnect to at least a second one of the plurality of incomplete coils in such a way that an alternating currently flowing in a clockwise direction within the first one of the plurality of incomplete coils flows in a counter-clockwise direction within the second one of the plurality of incomplete coils.

5. The coil structure of claim 1, wherein the plurality of incomplete coils and the at least one interconnect 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 two of the plurality of incomplete coils.

7. A coil structure comprising:

a plurality of coils, each of the plurality of coils formed from non-contiguous segments of a conductor; and

at least one interconnect configured to couple a first one of the plurality of coils to a second one of the plurality of coils, the at least one interconnect including a plurality of segments of a conductor arranged in such a way that an alternating current flowing in the at least one interconnect does not produce a magnetic field.

8. The coil structure of claim 7, wherein the plurality of coils is coupled to a circuit configured to provide an alternating current to the plurality of coils to cause each of the plurality of coils to emit magnetic flux.

9. The coil structure of claim 7, wherein the plurality of coils is coupled to a circuit configured to rectify an alternating current induced in at least one of the plurality of coils by magnetic flux.

10. The coil structure of claim 7, wherein at least a first one of the plurality of coils is coupled by the least one interconnect to at least a second one of the plurality of coils in such a way that an alternating currently flowing in a clockwise direction within the first one of the plurality of coils flows in a counter-clockwise direction within the second one of the plurality of coils.

11. The coil structure of claim 7, wherein the plurality of coils and the at least one interconnect are formed of a single continuous wire.

13. The coil structure of claim 7, further comprising a magnetic layer configured to magnetically couple together at least two of the plurality of coils.

18. The coil structure of claim 13, wherein the plurality of incomplete coils and the at least one interconnect are formed of a single continuous wire.

14. A coil structure comprising:

a plurality of coil arrays, each of the plurality of coil arrays comprising

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,

wherein the plurality of coil arrays are coupled together in series.

15. The coil structure of claim 14, 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 plurality of incomplete coils to emit magnetic flux.

16. The coil structure of claim 14, wherein the plurality of coil arrays is coupled to a circuit configured to rectify an alternating current induced in at least one of the plurality of incomplete coils by magnetic flux.

17. The coil structure of claim 14, wherein at least a first one of the plurality of incomplete coils is coupled by the least one interconnect to at least a second one of the plurality of incomplete coils in such a way that an alternating currently flowing in a clockwise direction within the first one of the plurality of incomplete coils flows in a counter-clockwise direction within the second one of the plurality of incomplete coils.

19. The coil structure of claim 14, further comprising a plurality of magnetic layers, each magnetic layer configured to magnetically couple together at least two of the plurality of incomplete coils.

20. The coil structure of claim 14, further comprising an air gap between each of the plurality of magnetic layers and another one of the plurality of magnetic layers.