Self-canceling magnetic structures for transferring power and communication signals

• US 10,020,849 B2
• Filed: 03/13/2017
• Issued: 07/10/2018
• Est. Priority Date: 03/14/2016
• Status: Active Grant

• Current Assignee: Quanten Technologies Limited
• Original Assignee: X2 Power Technologies Limited
• Inventors: Mao, Hengchun, Yang, Bo
• Primary Examiner(s): Sandiford, Devan
• Application Number:
  US15/457,397
• Publication Number:
  US 20170264343A1
• Time in Patent Office: 484 Days
• CPC Class Codes: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• 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 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A structure comprises a plurality of first turns of a coil and a plurality of second turns of the coil having a similar shape as the plurality of first turns of the coil, wherein the plurality of first turns of the coil and the plurality of second turns of the coil have a similar center position and a current flowing through the plurality of first turns of the coil and a current flowing through the plurality of second turns of the coil are in opposite directions.

Claims

1. A structure comprising:

a plurality of first turns of a coil, wherein the plurality of first turns is formed by a first continuous conductive element; and

a plurality of second turns of the coil having a similar shape as the plurality of first turns of the coil, wherein;

the plurality of second turns is formed by a second continuous conductive element;

the plurality of first turns of the coil and the plurality of second turns of the coil have a similar center position; and

a current flowing through the plurality of first turns of the coil and a current flowing through the plurality of second turns of the coil are in opposite directions.

2. The structure of claim 1, wherein:

the plurality of first turns of the coil is circular in shape.

3. The structure of claim 2, wherein:

the plurality of first turns of the coil starts from a first terminal of the coil and ends at a connection element; and

the plurality of second turns of the coil starts from the connection element and ends at a second terminal of the coil, and wherein;

the plurality of second turns of the coil is surrounded by the plurality of first turns of the coil; and

the first terminal and the second terminal are placed immediately next to each other.

4. The structure of claim 1, wherein:

a turn in the plurality of first turns of the coil has a slightly different shape from a turn in the plurality of second turns of the coil.

5. The structure of claim 1, wherein:

the plurality of first turns of the coil is rectangular in shape.

6. The structure of claim 1, wherein:

the plurality of first turns of the coil is octagonal in shape.

7. The structure of claim 1, further comprising:

a plurality of third turns of the coil and a plurality of fourth turns of the coil, wherein;

the plurality of third turns of the coil and the plurality of fourth turns of the coil have a similar shape and a similar center position; and

a current flowing through the plurality of third turns of the coil and a current flowing through the plurality of fourth turns of the coil are in opposite directions.

8. The structure of claim 7, wherein:

the plurality of first turns of the coil and the plurality of second turns of the coil are placed on a first layer of a printed circuit board; and

the plurality of third turns of the coil and the plurality of fourth turns of the coil are placed on a second layer of the printed circuit board.

9. The structure of claim 8, further comprising:

a via in the printed circuit board and connected between the plurality of second turns of the coil and the plurality of third turns of the coil.

10. A system comprising:

a first coil having a first winding structure comprising;

a plurality of first turns and a plurality of second turns of the first coil having a similar shape, wherein;

the plurality of first turns and the plurality of second turns have a similar center position; and

a current flowing through the plurality of first turns and a current flowing through the plurality of second turns are in opposite directions; and

a second coil having a plurality of turns, wherein the first coil and the second coil are two continuous conductive elements.

11. The system of claim 10, wherein:

the first coil is placed inside the second coil.

12. The system of claim 10, wherein:

the first coil is placed outside the second coil.

13. The system of claim 10, wherein:

one of the first coil and the second coil is configured to transfer power.

14. The system of claim 10, wherein:

one of the first coil and the second coil is configured to transfer communication signals.

15. The system of claim 10, wherein:

one of the first coil and the second coil is configured to transfer both power and communication signals.

16. A method comprising:

wirelessly transferring power from a transmitting coil on a transmitter to a receiving coil on a receiver, wherein each of the transmitting coil and the receiving coil comprises;

a plurality of first turns and a plurality of second turns having a similar shape, and wherein a current flowing through the plurality of first turns and a current flowing through the plurality of second turns are in opposite directions; and

communicating between the transmitter and the receiver through a communication coil having an 8-shaped structure comprising a first half circle and a second half circle.

17. The method of claim 16, wherein:

the step of communicating between the transmitter and the receiver is achieved by modulating a circuit parameter or an operation parameter of the transmitter.

18. The method of claim 17, wherein:

the communicating between the transmitter and the receiver is through the communication coil placed at the transmitter.

19. The method of claim 16, wherein:

the step of communicating between the transmitter and the receiver is achieved by modulating a circuit parameter or an operation parameter of the receiver.

20. The method of claim 19, wherein:

the communicating between the transmitter and the receiver is through the communication coil placed at the receiver.