PHASED ARRAY WIRELESS RESONANT POWER DELIVERY SYSTEM

• US 20100033021A1
• Filed: 09/30/2008
• Published: 02/11/2010
• Est. Priority Date: 08/05/2008
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Bennett, James D.
• Granted Patent: US 7,893,564 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 50/80 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: H04B 5/0037 for power transfer
• CPC Class Codes: H04B 5/0087 with multiple coils at either side
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H04B 7/0617 for beam forming

Abstract

A resonant power transmission system for wirelessly delivering electric power to a target device. A transmitter resonant phased array includes a power source operable to source alternating current power at a target frequency. A plurality of transmitting elements, each operable to produce a non-radiated magnetic field, produces a composite non-radiated magnetic field. A plurality of transmitter tuned circuit elements couple the alternating current power to the plurality of transmitting elements. Control circuitry controls the plurality of transmitter tuned circuit elements to direct the composite non-radiated magnetic field toward the target device. Communication circuitry communicates with the target device. The plurality of transmitting elements may be a plurality of coils with the control circuitry individually controlling phase of the non-radiated magnetic fields produced by the plurality of transmitting elements by control of the plurality of transmitter tuned circuit elements. The plurality of coils may be directed mechanically in other embodiments.

Claims

1. A resonant power transmission system for wirelessly delivering electric power to a target device, the resonant power transmission system comprising:

a transmitter resonant phased array comprising;

a power source operable to source alternating current power at a target frequency;

a plurality of transmitting elements, each operable to produce a non-radiated magnetic field, the plurality of transmitting elements operable to produce a composite non-radiated magnetic field;

a plurality of transmitter tuned circuit elements operable to couple the alternating current power to the plurality of transmitting elements; and

control circuitry operable to control the plurality of transmitter tuned circuit elements to direct the composite non-radiated magnetic field toward the target device; and

a communication circuit operable to communicate with the target device.

2. The resonant power transmission system of claim 1, wherein:

the plurality of transmitting elements comprise a plurality of coils; and

the control circuitry is operable to individually control phase of the non-radiated magnetic fields produced by the plurality of transmitting elements by control of the plurality of transmitter tuned circuit elements.

3. The resonant power transmission system of claim 1, wherein the control circuitry is operable to receive feedback from the target device via the communication circuitry that is used to direct the composite non-radiated magnetic field.

4. The resonant power transmission system of claim 1, wherein at least some of the plurality of transmitter tuned circuit elements comprise lumped circuit elements.

5. The resonant power transmission system of claim 1, wherein the plurality of transmitting elements are arranged in an array.

6. The resonant power transmission system of claim 1, further comprising a target device authentication module for authentication of the target device for wireless power delivery.

7. The resonant power transmission system of claim 1, further comprising a frequency selection controller for selecting the target frequency.

8. The resonant power transmission system of claim 1, further comprising a beacon module operable to transmit via the communication circuit a beacon regarding wireless power delivery.

9. The resonant power transmission system of claim 1, further comprising a directional controller for physically controlling orientation of the plurality of transmitting elements.

10. The resonant power transmission system of claim 1, wherein the control circuitry is further operable to dynamically select the target frequency.

11. A method for wirelessly delivering electric power to a target device, the method comprising:

sourcing alternating current power at a target frequency;

coupling the alternating current power to a plurality of transmitting elements to produce a non-radiated magnetic field by each of the plurality of transmitting elements, the plurality of non-radiated magnetic fields producing a composite non-radiated magnetic field;

controlling the non-radiated magnetic fields produced by the plurality of transmitting elements to direct the composite non-radiated magnetic field toward the target device; and

communicating with the target device.

12. The method of claim 11, wherein controlling the non-radiated magnetic fields produced by the plurality of transmitting elements to direct the composite non-radiated magnetic field toward the target device comprises individually controlling phase of alternating current power provided to at least some of the plurality of transmitting elements.

13. The method of claim 11, wherein controlling the non-radiated magnetic fields produced by the plurality of transmitting elements to direct the composite non-radiated magnetic field toward the target device comprises controlling a plurality of transmitter tuned circuit elements respectively associated with the plurality of transmitting elements.

14. The method of claim 13, wherein controlling a plurality of transmitter tuned circuit elements respectively associated with the plurality of transmitting elements comprises altering lumped tuning element settings of the plurality of transmitter tuned circuit elements.

15. The method of claim 11, further comprising:

receiving feedback from the target device; and

using the feedback to direct the composite non-radiated magnetic field.

16. The method of claim 11, further comprising authenticating the target device for wireless power delivery.

17. The method of claim 11, selecting the target frequency to facilitate transfer of power.

18. The method of claim 17, wherein selecting the target frequency comprises selecting the target frequency based upon feedback received from the target device.

19. The method of claim 11, further comprising wirelessly transmitting a beacon regarding wireless power delivery.

20. The method of claim 11, wherein controlling the non-radiated magnetic fields produced by the plurality of transmitting elements to direct the composite non-radiated magnetic field toward the target device comprises physically controlling orientation of the plurality of transmitting elements.