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APPARATUS, SYSTEM, AND METHOD FOR DETECTING A FOREIGN OBJECT IN AN INDUCTIVE WIRELESS POWER TRANSFER SYSTEM VIA COUPLING COEFFICIENT MEASUREMENT

  • US 20130257165A1
  • Filed: 03/30/2012
  • Published: 10/03/2013
  • Est. Priority Date: 10/13/2011
  • Status: Active Grant
First Claim
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1. An inductive wireless power device, comprising:

  • a transmitter configured to generate an electromagnetic field to a coupling region for wireless power transfer to a receiver; and

    control logic configured to determine a coupling coefficient of the wireless power transfer when the receiver is within the coupling region, and to determine a presence of a foreign object within the coupling region responsive to a comparison of the determined coupling coefficient and an expected coupling coefficient for the wireless power transfer.

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