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SYSTEMS AND METHODS FOR DETECTING AND PROTECTING A WIRELESS POWER COMMUNICATION DEVICE IN A WIRELESS POWER SYSTEM

  • US 20120248891A1
  • Filed: 01/17/2012
  • Published: 10/04/2012
  • Est. Priority Date: 03/31/2011
  • Status: Active Grant
First Claim
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1. A method of detecting a communication device within a wireless power transfer region of a wireless power transmitter configured to transfer power to a device, the method comprising:

  • generating a wireless power transfer field at a power level;

    transmitting a first signal at a first frequency and a second signal at a second frequency;

    detecting a third signal at a third frequency, the third frequency corresponding to an intermodulation product of the first frequency and the second frequency; and

    reducing the power level of the wireless power transfer field in response to the detection of the third signal.

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