Inductive power transfer system
AssigneeAuckland Uniservices Limited
InventorsGrant Anthony Covic, Michael Le Gallais Kissin
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Abstract
A magnetic flux pad (BPP) is provided for generating or receiving magnetic flux. The pad may be used with an inductive power transfer system, and comprises a magnetically permeable core (4) and two substantially flat overlapping coils (2, 3) magnetically associated with the core (4). The coils (2, 3) are arranged so that there is essentially no mutual coupling between them.
Claims28
A magnetic flux pad for generating or receiving magnetic flux, the magnetic flux pad comprising:
- a magnetically permeable material comprising a plurality of ferrite strips;
- and
- two substantially overlapping coils sitting on top of the magnetically permeable material and magnetically associated with the magnetically permeable material, whereby the overlap of the coils is adjusted to substantially minimize mutual coupling between the coils.
A power supply apparatus for an inductive power transfer system (IPT), the power supply apparatus comprising:
- a magnetic flux pad for generating a magnetic flux, the magnetic flux pad comprising a magnetically permeable material comprising a plurality of ferrite strips, two substantially overlapping coils sitting on top of the magnetically permeable material and magnetically associated with the magnetically permeable material;
- and
- a power supply adapted to provide a current in one of the overlapping coils which has a different phase to a current in the other of the overlapping coils.
A method for providing an Inductive Power Transfer (IPT) magnetic flux pad comprising a plurality of ferrite strips and two coils sitting on top of the plurality of ferrite strips, the method comprising:
- overlapping the coils, and
- varying the overlap between the coils such that an overlap position is achieved whereby mutual coupling between the coils is substantially minimized.
Dependencies are inferred from the claim text.