UNIVERSAL WIRELESS POWER SYSTEM COIL APPARATUS

• US 20170207664A1
• Filed: 01/16/2017
• Published: 07/20/2017
• Est. Priority Date: 01/19/2016
• Status: Abandoned Application

• Current Assignee: Garrity Power Services LLC
• Original Assignee: Garrity Power Services LLC
• Inventors: GARRITY, Paul
• Application Number:
  US15/407,055
• Publication Number:
  US 20170207664A1
• Time in Patent Office: Days
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• 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

A wireless power system. In one embodiment, the wireless power system comprises a wireless transmitter capable of transmitting power and a wireless receiver capable of receiving power such that the coupling between the transmitter and receiver is negligibly affected by introduction of an electrically conducting object near the wireless power system.

Claims

1. A wireless power system comprising:

a wireless power transmitter comprising a first coil configured to transmit power; and

a wireless power receiver comprising a second coil configured to receive power,

one of the wireless power transmitter and the wireless power receiver further comprising a limited flux steering mechanism,

the first coil and second coil being configured to form a first electro-magnetic coupling at a first operating frequency, the limited flux steering mechanism being configured to reduce an effect of nearby conductive objects on the first electromagnetic coupling.

2. The wireless power system of claim 1, the first coil or the second coil being oriented along a plane, wherein the limited flux steering mechanism comprises a sheet of low permeability magnetic material oriented in a plane adjacent to the plane of the first coil or the second coil.

3. The wireless power system of claim 1, wherein the low permeability magnetic material comprises powdered iron.

4. The wireless power system of claim 1, wherein the low permeability magnetic material comprises ferrite.

5. The wireless power system of claim 1, wherein the low permeability magnetic material has a relative permeability between 2 and 25.

6. The wireless power system of claim 1, wherein the power transmitter further comprises a third coil, the first coil and second coil being configured to form a second electromagnetic coupling at a second operating frequency, the limited flux steering mechanism being further configured to reduce the effect of nearby conductive objects on the second electromagnetic coupling.

7. The wireless power system of claim 6, wherein the first coil and the third coil are aligned in a single plane.

8. The wireless power system of claim 7, wherein the limited flux steering mechanism comprises a sheet of low permeability magnetic material oriented in a plane adjacent to the plane of the first coil and the third coil.

9. The wireless power system of claim 8, wherein the low permeability magnetic material has a relative permeability between 2 and 25.

10. The wireless power system of claim 6, wherein the transmitter is configured to operate over a frequency range between approximately 20 kHz to approximately 20 MHz.

11. The wireless power system of claim 6, wherein the ratio of the first operating frequency to the second operating frequency is greater than 30.

12. The wireless power system of claim 11, wherein the first operating frequency is greater than or equal to 6.78 MHz.

13. The wireless power system of claim 2, further comprising an electrically conductive material positioned on one side of the low permeability magnetic material such that the low permeability magnetic material is sandwiched between the electrically conductive material and either the first coil or the second coil.

14. A wireless power transmission system comprising:

a wireless transmitter comprising a first coil and a magnetic structure backing the first coil, the wireless transmitter being configured to wirelessly transmit power at a first frequency below 300 kHz and a second frequency above 3 MHz; and

a wireless receiver configured to receive power.

15. The wireless power transmission system of claim 14, wherein the second frequency is 6. 78 MHz.

16. The wireless power transmission system of claim 14, wherein the first frequency is between 100 kHz and 205 kHz.

17. The wireless power transmission system of claim 14, wherein the magnetic structure comprises a low permeability magnetic material.

18. The wireless power transmission system of claim 17, wherein the low permeability magnetic material comprises iron powder.

19. The wireless power transmission system of claim 17, wherein the permeability of the magnetic material is less than 25.

20. The wireless power transmission system of claim 14, further comprising a layer of high electrical conductivity material.