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Controlling inductive power transfer system

  • US 9,331,526 B2
  • Filed: 06/26/2013
  • Issued: 05/03/2016
  • 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, the system including a primary unit, having a tank circuit and switching circuit, operable to generate an electromagnetic field and at least one secondary device, separate from the primary unit, and adapted to couple with the field when the secondary device is in proximity to the primary unit so that power is received inductively by the secondary device from the primary unit without direct electrical conductive contacts therebetween, the method comprising:

  • determining there is an unacceptable amount of parasitic metal present in proximity to the primary unit;

    entering a shutdown mode in response to a determination that the unacceptable amount of parasitic metal is present in proximity to the primary unit; and

    remaining in the shutdown mode until the primary unit is reset.

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