POLYPHASE INDUCTIVE POWER TRANSFER SYSTEM WITH INDIVIDUAL CONTROL OF PHASES

• US 20150207335A1
• Filed: 08/28/2013
• Published: 07/23/2015
• Est. Priority Date: 08/28/2012
• Status: Active Grant

• Current Assignee: Auckland UniServices Limited (Auckland University)
• Original Assignee: Duleepa Jayanath Thrimawithana
• Inventors: Madawala, Udaya Kumara, Thrimawithana, Duleepa Jayanath
• Granted Patent: US 10,270,289 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 55/00 Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Abstract

The present invention provides a polyphase inductive power transfer (IPT) system comprising a primary power supply comprising a plurality of primary conductors, the primary conductors being individually selectively operable to provide or receive a magnetic field for inductive power transfer; and at least one pick-up comprising one or more pick-up conductors, the one or more pick-up conductors each being individually selectively operable to magnetically couple with a primary conductor to control power transfer between the primary power supply and a load coupled or coupleable with the respective pick-up. The polyphase primary power supply may be used to power a plurality of single-phase pick-ups, one or more polyphase pick-ups, or a combination thereof. Also disclosed are polyphase primary and secondary converters for use in such a system.

Claims

1. A polyphase inductive power transfer (IPT) system comprising:

a primary power supply comprising a plurality of primary conductors, the primary conductors being individually selectively operable to control an alternating current in each of the primary conductors to provide or receive a magnetic field for inductive power transfer; and

at least one pick-up comprising one or more pick-up conductors, the one or more pick-up conductors each being individually selectively operable to magnetically couple with a primary conductor to control power transfer between the primary power supply and a load coupled or coupleable with the respective pick-up.

2. The polyphase IPT system of claim 1 wherein any one or more of the plurality of primary conductors are selectively operable to provide a magnetic field as required.

3. The polyphase IPT system of claim 1, wherein each of the plurality of primary conductors is operated only when a load is to be powered by a pick-up magnetically coupled with the respective primary conductor.

4. The polyphase IPT system of claim 1, wherein the primary conductors are each operated out of phase by 360°

/n, where n is the number of primary conductors.

5. The polyphase IPT system of claim 3, wherein the primary conductors are each operated out of phase by 360°

/n, where n is the number of operating primary conductors.

6. The polyphase IPT system of claim 1, wherein each of the primary conductors are individually selectively coupled to a power source to control the alternating current in the respective primary conductor.

7. The polyphase IPT system of claim 1, wherein the primary power supply further comprises a plurality of switch pairs each selectively coupling a power source to at least one primary conductor whereby each primary conductor is coupled to the power source by a pair of switch pairs, and the switch pairs are independently controlled to control the alternating current in each of the primary conductors.

8. The polyphase IPT system of claim 7, wherein the alternating current in each of the primary conductors is controlled by controlling the phase angle between the respective pair of switch pairs coupled therewith.

9. The polyphase IPT system of claim 1, wherein the system is bi-directional and power may be selectively transferred from the primary power supply to the at least one pick-up or vice versa.

10. The polyphase IPT system of claim 1, wherein power transfer between the primary power supply and a respective pick-up is controlled by controlling the phase angle of an alternating current in the pick-up conductor with respect to the alternating current in the respective primary conductor.

11. The polyphase IPT system of claim 1, wherein the phase angle between respective alternating currents in the primary and pick-up conductors is regulated at ±

90° and

power transfer between the power source and the load is controlled by controlling the magnitude of the alternating currents in the primary and/or pick-up conductors.

12. The polyphase IPT system of claim 1 comprising a pick-up comprising a plurality of pick-up conductors each magnetically coupled or coupleable with one of the plurality of primary conductors to receive polyphase power from the primary power supply.

13. The polyphase IPT system of claim 12, wherein the pick-up further comprises a plurality of switch pairs each selectively coupling a load to at least one pick-up conductor whereby each pick-up conductor is coupled to the load by a pair of switch pairs, and the switch pairs are independently controlled to control power transfer between each of the pick-up conductors and the load.

14. The polyphase IPT system of claim 13, wherein the power transfer between each of the pick-up conductors and the load is controlled by controlling the phase angle between the respective pair of switch pairs coupled therewith.

15. The polyphase IPT system of claim 12, wherein the pick-up comprises a plurality of pick-up conductors equal in number to the plurality of primary conductors.

16. The polyphase IPT system of claim 1 comprising one or more pick-ups each comprising a single pick-up conductor magnetically coupled or coupleable with any one of the plurality of primary conductors.

17. The polyphase IPT system of claim 1, wherein the primary power supply automatically adapts to inductively power:

one or more pick-ups comprising a plurality of pick-up conductors; and

one or more pick-ups each comprising a single pick-up conductor.

18. A polyphase inductive power transfer (IPT) converter comprising a plurality of conductors individually selectively operable to control an alternating current in each of the primary conductors to provide or receive a magnetic field for inductive power transfer.

19. The IPT converter of claim 18 wherein the conductors are each operated out of phase by 360°

/n, where n is the number of conductors.

20-33. -33. (canceled)

34. An inductive power transfer (IPT) power supply comprising a plurality of primary conductors, the primary conductors being individually selectively operable to provide or receive a magnetic field for inductive power transfer, wherein the power supply automatically adapts to supply power inductively to a single pick-up comprising a plurality of pick-up conductors and one or more pick-ups each comprising a single pick-up conductor.

35. (canceled)