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Signaling charging in wireless power environment

  • US 9,991,747 B2
  • Filed: 08/27/2015
  • Issued: 06/05/2018
  • Est. Priority Date: 05/13/2008
  • Status: Active Grant
First Claim
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1. An apparatus for transferring wireless power to one or more receivers, comprising:

  • a resonant transmit antenna circuit configured to generate a magnetic field at a resonant frequency for coupling power to the one or more receivers; and

    a controller operably coupled to the resonant transmit antenna circuit, the controller configured to adjust a power of the magnetic field between at least a first-power mode and a second-power mode, a power level corresponding to the second-power mode being greater than the power level corresponding to the first-power mode, and the power of the magnetic field in the second-power mode capable of charging the one or more receivers positioned in a coupling mode region;

    the controller further configured to;

    receive one or more messages from a receiver of the one or more receivers in the coupling mode region during the first-power mode via a wireless communication channel different than the magnetic field,switch to the second-power mode at least in part in response to detecting the one or more messages from the receiver,determine, during the second-power mode, whether one or more messages from the receiver were not received by the controller via the wireless communication channel;

    remove the receiver from a list of one or more receivers positioned to receive power based at least in part on determining that the one or more messages were not received, andswitch to the first-power mode in response to determining that there are no other receivers receiving power via the magnetic field in the coupling mode region.

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