Near-field charging pad for wireless power charging of a receiver device that is temporarily unable to communicate

  • US 10,277,054 B2
  • Filed: 02/17/2016
  • Issued: 04/30/2019
  • Est. Priority Date: 12/24/2015
  • Status: Active Grant
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First Claim
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1. A method of wirelessly delivering power to a receiver device, the method comprising:

  • while a receiver device lacks sufficient power to send an electromagnetic communication signal;

    radiating, via an antenna of a unit cell included in a near-field charging pad, a radio frequency (RF) power transmission wave at a first power level, wherein the near-field charging pad includes a plurality of unit cells, including the unit cell;

    detecting, by the near-field charging pad, an amount of energy associated with the RF power transmission wave that is reflected by one or more of the plurality of unit cells;

    determining, by the near-field charging pad, that the receiver device is within a near-field charging distance of the near-field charging pad when the amount satisfies a threshold; and

    in response to determining that the receiver device is within the near-field charging distance of the near-field charging pad, continuing to radiate, via the antenna of the unit cell, the RF power transmission wave at the first power level; and

    upon receiving an electromagnetic communication signal generated by the receiver device;

    ceasing to radiate the RF power transmission wave at the first power level; and

    radiating, via the antenna of the unit cell, a new RF power transmission wave at a second power level greater than the first power level.

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