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Controlling Inductive Power Transfer Systems

  • US 20070228833A1
  • Filed: 05/11/2005
  • Published: 10/04/2007
  • Est. Priority Date: 05/11/2004
  • Status: Active Grant
First Claim
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1. A method of controlling inductive power transfer in an inductive power transfer system comprising a primary unit operable to generate an electromagnetic field and at least one secondary device, separable from the primary unit, and adapted to couple with said field when the secondary device is in proximity to the primary unit so that power can be received inductively by the secondary device from the primary unit without direct electrical conductive contacts therebetween, which method comprises:

  • detecting if there is a substantial difference between, on the one hand, a power drawn from the primary unit and, on the other hand, a power required by the secondary device or, if there is more than one secondary device, a combined power required by the secondary devices; and

    following such detection, restricting or stopping the inductive power supply from the primary unit.

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