Tiled wireless charging coil solution for extended active area

• US 10,109,416 B2
• Filed: 06/30/2016
• Issued: 10/23/2018
• Est. Priority Date: 12/04/2014
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Elkhouly, Essam, Yang, Songnan
• Primary Examiner(s): Tso, Edward
• Application Number:
  US15/199,739
• Publication Number:
  US 20170069421A1
• Time in Patent Office: 845 Days
• Field of Search: 320107, 320108, 320116, 307104
• 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 50/402 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

The disclosure generally relates to a method and apparatus for wireless charging station. In one embodiment, the disclosure provides an overlapping (or tiled) layout of a plurality of coils. Each coil may have a symmetric or an asymmetric turn layout. The disclosure also provides design optimization techniques configured to determine the optimal tile overlap distance and/or coil size to provide a substantially uniform electro-magnetic field over the surface of the wireless charging station.

Claims

1. A transmitter charging station, comprising:

a first coil having a first layout to provide a first resonant magnetic field;

a second coil having a second layout to provide a second resonant magnetic field, the second coil overlapping the first coil;

wherein the second coil overlaps the first coil with an overlap distance in a range of about 10-50% of a width of the first coil, wherein the width comprises a shortest distance across the center of the first coil between outer-most edges of an outer-most turn of the first coil; and

wherein the outer-most turn of the first coil extends beyond an inner-most turn of the second coil in a direction of the overlap distance.

2. The charging station of claim 1, wherein the first layout and the second layout each comprises a symmetric geometry.

3. The charging station of claim 1, further comprising a third coil having a third layout and partially overlapping the second coil, wherein the third layout comprises a geometry of the first layout.

4. The charging station of claim 1, wherein the first layout and the second layout each comprise a rectangular geometry.

5. The charging station of claim 1, wherein the first layout and the second layout each comprises a multi-sided layout, wherein each side of the multi-sided layout is curved outwardly.

6. The charging station of claim 1, comprising a third coil that at least partially overlaps the second coil to extend the magnetic field of the first and the second coil.

7. The charging station of claim 1, wherein the first coil and the second coil are tiled with a plurality of additional coils to form a circular design.

8. The charging station of claim 1, wherein the first layout comprises a symmetric geometry and the second layout comprises an asymmetric geometry.

9. The charging station of claim 1, wherein the first layout or the second layout comprises a multi-sided layout in which at least one side is curved outwardly.

10. The charging station of claim 1, further comprising a tuning capacitor coupled between the first coil and the second coil.

11. A coil array, comprising:

a first coil having a first layout to provide a first resonant magnetic field;

a second coil having a second layout to provide a second resonant magnetic field, the second coil overlapping the first coil;

wherein the second coil overlaps the first coil with an overlap distance in a range of about 10-50% of a width of the first coil, wherein the width comprises a shortest distance across the center of the first coil between outer-most edges of an outer-most turn of the first coil; and

wherein the outer-most turn of the first coil extends beyond an inner-most turn of the second coil in a direction of the overlap distance.

12. The coil array of claim 11, wherein the first layout and the second layout each comprises a symmetric geometry.

13. The coil array of claim 11, comprising a third coil having a third layout and partially overlapping the second coil, wherein the third layout comprises a geometry of the first layout.

14. The coil array of claim 11, wherein the first layout and the second layout each comprise a rectangular geometry.

15. The coil array of claim 11, wherein the first layout and the second layout each comprises a multi-sided layout, wherein each side of the multi-sided layout is curved outwardly.

16. The coil array of claim 11, comprising a the third coil that at least partially overlaps the second coil to extend the magnetic field of the first and the second coil.

17. The coil array of claim 11, wherein the first coil and the second coil are tiled with a plurality of additional coils to form a circular design.

18. The coil array of claim 11, wherein the first layout comprises a symmetric geometry and the second layout comprises an asymmetric geometry.

19. The coil array of claim 11, wherein the first layout or the second layout comprises a multi-sided layout in which at least one side is curved outwardly.

20. The coil array of claim 11, further comprising a tuning capacitor coupled between the first coil and the second coil.