Multiphase inductive power supply system

• US 8,742,625 B2
• Filed: 09/25/2008
• Issued: 06/03/2014
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Philips IP Ventures B.V. (Koninklijke Philips N.V.)
• Original Assignee: Access Business Group International LLC (Alticor Incorporated)
• Inventors: Baarman, David W., Guthrie, Warren E., Duckworth, Paul
• Primary Examiner(s): Amrany, Adi
• Application Number:
  US12/680,349
• Publication Number:
  US 20100314947A1
• Time in Patent Office: 2,077 Days
• Field of Search: 307/104
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/70 specially adapted for specific purposes
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A multiphase inductive power supply wirelessly transmits power in multiple phases. A primary circuit energizes multiple tank circuits in an out of phase relationship. A secondary circuit receives the power and recombines the power. The amount of energy in each phase is reduced compared to transferring the same amount of power using a single phase inductive power supply.

Claims

1. A multiphase inductive power supply system comprising:

a DC power source;

a ground;

a microprocessor;

a plurality of tank circuits, wherein each tank circuit includes a primary inductive coupler and a capacitor;

a plurality of oscillators, wherein each of said plurality of oscillators is electrically coupled to said microprocessor, wherein said microprocessor signals each of said plurality of oscillators to produce an oscillating signal in an out of phase relationship from each other of said plurality of oscillators, wherein said microprocessor signals each of said plurality of oscillators to vary a timing of said oscillating signal based on feedback from a remote device;

a plurality of drivers, wherein each of said plurality of drivers is electrically coupled to at least one of said plurality of oscillators;

a plurality of switching circuits, wherein each of said plurality of switching circuits is electrically coupled to at least one of said plurality of drivers and wherein each of said plurality of switching circuits selectively electrically couples said DC power source or said ground to one of said tank circuits to generate alternating current, wherein each alternating current is in said out of phase relationship;

a multiphase inductive secondary circuit connected to said remote device with a plurality of secondary inductive couplers, wherein each of said plurality of secondary inductive couplers inductively couples to at least one of said primary inductive couplers in each of said plurality of tank circuits, wherein each of said plurality of secondary inductive couplers generates current in said out of phase relationship, wherein said remote device provides said feedback through said inductive coupling;

a phase combination circuit electrically coupled to said plurality of secondary inductive couplers for combining said generated out of phase currents.

2. The multiphase inductive power supply system of claim 1 wherein said plurality of primary inductive couplers are arranged in a tight overlapping triangular relationship so that voltage from adjacent primary inductive couplers cancels.

3. The multiphase inductive power supply system of claim 1 wherein said plurality of secondary inductive couplers are arranged in a tight overlapping triangular relationship.

4. The multiphase inductive power supply system of claim 1 wherein said plurality of primary inductive couplers are arranged in a loose, linear fashion.

5. The multiphase inductive power supply system of claim 1 wherein said plurality of primary inductive couplers are arranged in a loose, non-overlapping, triangular fashion.

6. The multiphase inductive power supply system of claim 1 wherein the phase of each oscillator signal is offset by 120 degrees from said phase of each other oscillator signal.

7. The multiphase inductive power supply system of claim 1 wherein the phase of each oscillator signal is offset by 30 degrees from at least one other oscillator signal.

8. The multiphase inductive power supply system of claim 1, wherein said feedback is based on a power supply need of said remote device.

9. The multiphase inductive power supply system of claim 1, further comprising a load electrically connected to said phase combination circuit.

10. A multiphase inductive power supply that receives a feedback signal from a remote device, said multiphase inductive power supply comprising:

a plurality of tank circuits, wherein each of said plurality of tank circuits includes a primary inductive coupler for inductively coupling to a secondary inductive coupler of the remote device;

a multiphase inductive primary circuit energizes each of said plurality of tank circuits at a different phase such that said plurality of tank circuits are energized in staggered phases, said multiphase inductive primary circuit varies a timing of said energizing based on the feedback signal from the remote device in at least one of said plurality of tank circuits, wherein the feedback signal is received from the secondary inductive coupler of the remote device through said primary inductive coupler of at least one of said plurality of tank circuits.

11. The multiphase inductive power supply of claim 10 wherein said plurality of tank circuits are arranged in a tight overlapping triangular relationship so that energy from adjacent tank circuits cancels.

12. The multiphase inductive power supply of claim 10 wherein said plurality of tank circuits are arranged in a loose, linear fashion.

13. The multiphase inductive power supply of claim 10 wherein said plurality of tank circuits are arranged in a loose, non-overlapping, triangular fashion.

14. The multiphase inductive power supply of claim 10 wherein each phase is staggered at least 120 degrees apart.

15. The multiphase inductive power supply of claim 10 wherein each phase is staggered at least 30 degrees apart.