WIRELESS ENERGY TRANSFER USING MAGNETIC MATERIALS TO SHAPE FIELD AND REDUCE LOSS

• US 20100164298A1
• Filed: 12/28/2009
• Published: 07/01/2010
• Est. Priority Date: 09/27/2008
• Status: Active Grant

• Current Assignee: WiTricity Corporation
• Original Assignee: WiTricity Corporation
• Inventors: Kesler, Morris P., Karalis, Aristeidis, Hall, Katherine L., Soljacic, Marin, Kurs, Andre B., Kulikowski, Konrad J., Campanella, Andrew J.
• Granted Patent: US 8,324,759 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 7/005 with variable reactance for tuning the antenna
• 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
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

In embodiments of the present invention improved capabilities are described for a method and system comprising a source resonator optionally coupled to an energy source and a second resonator located a distance from the source resonator, where the source resonator and the second resonator are coupled to provide near-field wireless energy transfer among the source resonator and the second resonator and where the field of at least one of the source resonator and the second resonator is shaped using a magnetic material to avoid a loss-inducing object.

Claims

1. A system, comprising:

a source resonator optionally coupled to an energy source; and

a second resonator located a distance from the source resonator;

wherein the source resonator and the second resonator are coupled to provide near-field wireless energy transfer among the source resonator and the second resonator and wherein the field of at least one of the source resonator and the second resonator is shaped using a magnetic material to avoid a loss-inducing object.

2. The system of claim 1, wherein at least one of the source resonator and the second resonator have a quality factor, Q>

100.

3. The system of claim 1, wherein the source resonator Q is greater than 100 and the second resonator Q is greater than 100.

4. The system of claim 1, wherein the square root of the source resonator Q times the second resonator Q is greater than 100.

5. The system of claim 1, comprising more than one source resonator.

6. The system of claim 1, comprising more than one second resonator.

7. The system of claim 1, comprising more than three resonators.

8. A method, comprising:

providing a source resonator optionally coupled to an energy source and a second resonator located a distance from the source resonator, wherein the source resonator and the second resonator are coupled to provide near-field wireless energy transfer among the source resonator and the second resonator and wherein the field of at least one of the source resonator and the second resonator is shaped using a magnetic material to avoid a loss-inducing object.

9. The method of claim 8, wherein at least one of the source resonator and the second resonator have a quality factor, Q>

100.

10. The method of claim 8, wherein the source resonator Q is greater than 100 and the second resonator Q is greater than 100.

11. The method of claim 8, wherein the square root of the source resonator Q times the second resonator Q is greater than 100.

12. The method of claim 8, comprising more than one source resonator.

13. The method of claim 8, comprising more than one second resonator.

14. The method of claim 8, comprising more than three resonators.