TRANSMIT POWER CONTROL FOR A WIRELESS CHARGING SYSTEM

  • US 20090284369A1
  • Filed: 10/10/2008
  • Published: 11/19/2009
  • Est. Priority Date: 05/13/2008
  • Status: Abandoned Application
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First Claim
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1. A method of wireless power transfer, comprising:

  • generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna at a low-power beacon mode;

    responding to the low-power beacon mode with a receiver response comprising consuming power from the electromagnetic field with a receive antenna operating substantially near the resonant frequency in the coupling-mode region;

    detecting the receiver response to the low-power beacon mode by detecting a difference in power supplied to the electromagnetic field during the receiver response relative to before the receiver response;

    generating the electromagnetic field at a high-power charging mode responsive to the receiver response.

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