Foreign Object Detection in Inductive Coupled Devices

  • US 20110128015A1
  • Filed: 10/29/2010
  • Published: 06/02/2011
  • Est. Priority Date: 11/03/2009
  • Status: Active Grant
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First Claim
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1. A primary device for inductive power transfer to a secondary device, the primary device comprising:

  • a primary coil, the primary device being configured to (i) operate in a first mode during which the primary coil transfers power through inductive coupling to the secondary device, and (ii) operate in a second mode during which a foreign object is detected; and

    a primary controller configured to operate the primary coil (i) using a first frequency during the first mode, and (ii) using a second frequency during the second mode.

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