UNIFORM WIRELESS CHARGING DEVICE

• US 20170179751A1
• Filed: 12/22/2015
• Published: 06/22/2017
• Est. Priority Date: 12/22/2015
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Elkhouly, Essam, Yang, Songnan, Yao, Zhen
• Granted Patent: US 10,714,960 B2
• Time in Patent Office: Days
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

In a wireless charging device that includes a resonator having coil windings, a magnetic field can be generated by the resonator. The wireless charging device can include a feed point connected to an inner winding of the coil windings of the resonator. The resonator can inductively couple with a power receiving unit such that the an outer winding of the coil windings limit Eddy current generation in one or more conductive surfaces positioned adjacent to the power receiving unit. The feed point can be selectively connected to the inner winding of the coil in a first mode of operation and the outer winding of the coil in a second mode of operation. The inner winding can have a larger current than the outer winding.

Claims

1. A wireless charging device, comprising:

a resonator including coil windings, the resonator configured to generate a magnetic field; and

a feed point connected to an inner winding of the coil windings of the resonator, the feed point being configured to connect power to the resonator.

2. The wireless charging device of claim 1, further comprising:

one or more tuning capacitors connected in series between the feed point and the coil windings.

3. The wireless charging device of claim 1, wherein the coil windings further comprise one or more in-line capacitors.

4. The wireless charging device of claim 1, wherein the feed point is connected to an innermost winding of the coil windings.

5. The wireless charging device of claim 1, wherein inner winding is surrounded by one or more other windings of the coil windings.

6. The wireless charging device of claim 1, wherein the coil windings are substantially concentrically arranged.

7. The wireless charging device of claim 1, wherein the resonator is configured to generate a larger current in the inner winding of the coil windings than an outer winding of the coil.

8. The wireless charging device of claim 7, wherein the resonator is configured to generate the larger current in the inner winding of the coil windings than the outer winding of the coil in the presence of one or more conductive surfaces positioned adjacent to the wireless charging device.

9. The wireless charging device of claim 1, wherein outer windings of the coil windings are configured to limit Eddy current generation in one or more conductive surfaces positioned adjacent to the wireless charging device.

10. A wireless charging device, comprising:

a resonator including coil windings, the resonator configured to generate a magnetic field; and

a feed point selectively connected to the coil windings of the resonator, the feed point being configured to connect power to the resonator,

wherein the feed point is connected to;

an inner winding of the coil in a first mode of operation, and

an outer winding of the coil in a second mode of operation.

11. The wireless charging device of claim 10, wherein:

the feed point comprises a first feed point and a second feed point; and

in a third mode of operation, the first feed point is connected to the inner winding of the coil windings and the second feed point is connected to the outer winding of the coil windings.

12. The wireless charging device of claim 10, wherein the feed point is selectively connected to the coil windings of the resonator based on one or more characteristics of the wireless charging device or an associated power receiving unit.

13. The wireless charging device of claim 12, wherein the one or more characteristics comprise one or more of:

the current of the resonator, a voltage induced in the power receiving unit, and a mutual impedance between the wireless charging device and the power receiving unit.

14. The wireless charging device of claim 10, wherein the feed point is selectively connected to the coil windings of the resonator based on a control signal received by the wireless charging device.

15. The wireless charging device of claim 10, further comprising:

one or more tuning capacitors connected in series between the feed point and the coil windings.

16. The wireless charging device of claim 10, wherein the coil windings further comprise one or more in-line capacitors.

17. The wireless charging device of claim 10, wherein the coil windings are substantially concentrically arranged.

18. The wireless charging device of claim 10, wherein the resonator is configured to generate a larger current in the inner winding of the coil windings than an outer winding of the coil.

19. The wireless charging device of claim 18, wherein the resonator is configured to generate a larger current in the inner winding of the coil windings than an outer winding of the coil in the presence of one or more conductive surfaces positioned adjacent to the wireless charging device.

20. The wireless charging device of claim 10, wherein outer windings of the coil windings are configured to limit Eddy current generation in one or more conductive surfaces positioned adjacent to the wireless charging device.

21. A power transmitting unit (PTU), comprising:

a resonator including coil windings having an inner winding and an outer winding, the resonator configured to generate a magnetic field to inductively couple with a power receiving unit (PRU), wherein the outer winding of the coil windings is configured to limit Eddy current generation in one or more conductive surfaces positioned adjacent to the PRU; and

a feed point selectively connected to the coil windings of the resonator,

wherein the feed point is connected to;

the inner winding of the coil in a first mode of operation, the inner winding having a larger current than the outer winding; and

the outer winding of the coil in a second mode of operation.

22. The PTU of claim 21, wherein:

the feed point comprises a first feed point and a second feed point; and

in a third mode of operation, the first feed point is connected to the inner winding of the coil windings and the second feed point is connected to the outer winding of the coil windings.