WIRELESS POWER TRANSMISSION STRUCTURES

• US 20160181858A1
• Filed: 12/14/2015
• Published: 06/23/2016
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Kirwin, William, Kuo, Ron-Chi, Satyamoorthy, Anand, Riehl, Patrick Stanley
• Granted Patent: US 10,283,997 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power transfer apparatus includes a support structure having a top surface and a side surface. The support structure is configured to support a mobile device on the top surface and a wearable device at the side surface. The wireless power transfer apparatus also includes a plurality of transmit coils within the support structure. The plurality of transmit coils are configured to wirelessly transmit power to the mobile device on the top surface and the wearable device at the side surface.

Claims

1. A wireless power transfer apparatus, comprising:

a support structure having a top surface and a side surface, the support structure being configured to support a mobile device on the top surface and a wearable device at the side surface; and

a plurality of transmit coils within the support structure, the plurality of transmit coils being configured to wirelessly transmit power to the mobile device on the top surface and the wearable device at the side surface.

2. The wireless power transfer apparatus of claim 1, wherein the plurality of transmit coils are connected in series.

3. The wireless power transfer apparatus of claim 1, wherein the plurality of transmit coils comprises a first transmit coil that conducts current in a first direction and a second transmit coil that conducts current in a second direction opposite to the first direction to produce constructive interference at the side surface.

4. The wireless power transfer apparatus of claim 3, wherein the first transmit coil comprises a spiral-shaped winding proximate the top surface of the support structure.

5. The wireless power transfer apparatus of claim 1, wherein the support structure has a central axis, and wherein the plurality of transmit coils are configured to wirelessly transmit power to the wearable device when the wearable device is placed on the side surface at any angular position about the central axis.

6. The wireless power transfer apparatus of claim 1, wherein the support structure has a height of between 2 cm and 15 cm.

7. The wireless power transfer apparatus of claim 1, wherein the support structure has a perimeter of between 8 cm and 20 cm.

8. The wireless power transfer apparatus of claim 1, further comprising a base housing circuitry that drives the plurality of transmit coils, wherein the support structure extends above the base.

9. The wireless power transfer apparatus of claim 1, further comprising a base having a ridge to position the wearable device at the side surface.

10. The wireless power transfer apparatus of claim 9, wherein the base houses circuitry to drive the plurality of transmit coils and the wireless power transfer apparatus further comprises a magnetic shield between the plurality of transmit coils and the circuitry.

11. A wireless power transfer apparatus, comprising:

a support structure configured to accommodate an electronic device at a side surface of the support structure; and

an upper transmit coil and a lower transmit coil within the support structure, the upper and lower transmit coils having current that flows in opposite directions to produce magnetic fields that constructively interfere with one another at the side surface.

12. The wireless power transfer apparatus of claim 11, wherein the upper and lower transmit coils are connected in series.

13. The wireless power transfer apparatus of claim 11, wherein the upper transmit coil comprises a spiral-shaped winding proximate a top surface of the support structure.

14. The wireless power transfer apparatus of claim 11, wherein the support structure has a central axis, and wherein the upper and lower transmit coils are configured to wirelessly transmit power to the electronic device when the electronic device is placed on the side surface at any angular position about the central axis.

15. The wireless power transfer apparatus of claim 11, wherein the support structure has a height of between 2 cm and 15 cm.

16. The wireless power transfer apparatus of claim 11, wherein the support structure has a perimeter of between 8 cm and 20 cm.

17. A wireless power transfer apparatus, comprising:

a support structure having a cavity configured to accommodate an electronic device; and

an upper transmit coil and a lower transmit coil within the support structure, the upper and lower transmit coils having current that flows in opposite directions to produce magnetic fields that constructively interfere in the cavity to wirelessly transmit power to the electronic device.

18. The wireless power transfer apparatus of claim 17, wherein the upper and lower transmit coils are connected in series.

19. The wireless power transfer apparatus of claim 17, wherein a compartment of a vehicle comprises the support structure.

20. The wireless power transfer apparatus of claim 17, wherein the compartment comprises a cup holder.

21. The wireless power transfer apparatus of claim 17, further comprising a magnetic shield around a side of the upper and lower transmit coils.

22. The wireless power transfer apparatus of claim 21, wherein the magnetic shield surrounds the side of the upper and lower transmit coils and is also formed below the lower transmit coil.