Contactless power transfer system

1. A contactless power transfer system comprising:

a power exchanging coil configured to exchange power with a transmitter power coil via a magnetic field;

a field focusing element for receiving the magnetic field from the transmitter power coil and focusing the magnetic field onto the power exchanging coil, the field focusing element having a resonance frequency that is the same as a resonance frequency of the transmitter power coil; and

a compensation coil coupled to the power exchanging coil such that the power exchanging coil is positioned between the field focusing element and the compensation coil, the compensation coil having a compensation coil capacitor and a resonance frequency different from the resonance frequency of the field focusing element for matching an impedance of the contactless power transfer system and compensating a change in phase resulting from a misalignment of the power exchanging coil and the transmitter power coil.

2. The system of claim 1 , wherein the field focusing element comprises at least one resonator.

3. The system of claim 2 , wherein the at least one resonator comprises a plurality of resonators arranged in an array wherein the plurality of resonators operate together as a single unit and a resultant magnetic field is emitted by the plurality of resonators that is focused onto the power exchanging coil.

4. The system of claim 2 , wherein the at least one resonator comprises at least two different resonance frequencies.

5. The system of claim 4 , wherein the at least two different resonance frequencies enable transfer of power and data signals.

6. The system of claim 1 , wherein the power exchanging coil is coupled between the field focusing element and the compensation coil.

7. The system of claim 1 , wherein the contactless power transfer system is electrically coupled to a vehicle.

8. A system comprising:

a first power exchanging coil;

a contactless power transfer system coupled to the first power exchanging coil, wherein the contactless power transfer system exchanges power with the first power exchanging coil via a magnetic field, wherein the contactless power transfer system comprises:

a second power exchanging coil configured to exchange power with the first power exchanging coil via the magnetic field;

a field focusing element for receiving the magnetic field from the transmitter power coil and focusing the magnetic field onto the power exchanging coil, the field focusing element having a resonance frequency that is the same as a resonance frequency of the first power exchanging coil; and

a compensation coil coupled to the power exchanging coil such that the power exchanging coil is positioned between the field focusing element and the compensation coil, the compensation coil having a compensation coil capacitor and a resonance frequency different from the resonance frequency of the field focusing element for matching an impedance of the contactless power transfer system and compensating a change in phase resulting from a misalignment of the second power exchanging coil with respect to the first power exchanging coil.

9. The system of claim 8 , wherein the first power exchanging coil comprises a transmitter coil and the contactless power transfer system comprises a receiver coil.

10. The system of claim 9 , wherein the first power exchanging coil is electrically coupled to a power source and the contactless power transfer system is electrically coupled to a load.

11. The system of claim 10 , wherein the load comprises an energy storage device.

12. The system of claim 8 , wherein the field focusing element comprises at least one resonator.

13. The system of claim 12 , wherein the at least one resonator comprises a plurality of resonators arranged in an array, wherein the plurality of resonators operate together as a single unit and a resultant magnetic field is emitted by the plurality of resonators that is focused onto the second power exchanging coil.

14. The system of claim 12 , wherein the at least one resonator comprises at least two different resonance frequencies.

15. The system of claim 14 , wherein the at least two different resonators frequencies enable transfer of power and data signals.

16. The system of claim 8 , wherein the first power exchanging coil and the second power exchanging coil are configured to handle a bidirectional flow of power between the first power exchanging coil and the second power exchanging coil.

17. The system of claim 8 , wherein the contactless power transfer system is electrically coupled to a vehicle.

18. A method comprising:

generating a magnetic field from power received from a first power exchanging coil;

receiving the magnetic field from the transmitter power coil using a field focusing element;

focusing the magnetic field onto a second power exchanging coil by the field focusing element, the field focusing element having a resonance frequency that is the same as a resonance frequency of the first power exchanging coil;

coupling a compensation coil to the power exchanging coil such that the power exchanging coil is positioned between the field focusing element and the compensation coil; and

compensating a change in phase and matching impedance using the compensation coil for enhancing power exchanging capability of the second power exchanging coil, wherein the compensation coil comprises a resonant frequency different from the resonance frequency of the field focusing element.