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Wireless power transfer apparatus and method thereof

  • US 9,461,478 B2
  • Filed: 10/10/2012
  • Issued: 10/04/2016
  • Est. Priority Date: 08/20/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • measuring a signal associated with a transmitter of a wireless power system at a plurality of transmission frequencies; and

    determining whether a receiving device is coupled to the transmitter based on the measured signal, said determining comprising determining if a number of local minima of the measured signal versus frequency is greater than or equal to 2.

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