Proximity transmitters for wireless power charging systems

  • US 10,021,523 B2
  • Filed: 12/24/2015
  • Issued: 07/10/2018
  • Est. Priority Date: 07/11/2013
  • Status: Active Grant
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First Claim
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1. A transmitter for wireless power charging, the transmitter comprising:

  • a plurality of antennas configured to transmit one or more wireless power transmission waves to a receiver that uses the one or more wireless power transmission waves for charging or powering of a device associated with the receiver;

    an interface configured to couple to a computing device at a corresponding interface of the computing device, and to receive electrical current from the computing device via the corresponding interface of the computing device;

    a communications component configured to receive one or more communications signals from the device associated with the receiver, wherein the one or more communications signals are distinct from the one or more wireless power transmission waves; and

    a controller configured to;

    determine a signal strength of the one or more communications signals;

    determine whether the device associated with the receiver is within a proximity threshold from the transmitter based at least in part on the signal strength of the one or more communications signals;

    determine at least one waveform characteristic for wireless power transmission waves based at least in part on the signal strength of the one or more communications signals; and

    activate a first subset of antennas of the plurality of antennas to transmit the wireless power transmission waves to the receiver upon determining that the device associated with the receiver is within the proximity threshold from the transmitter, wherein;

    the plurality of antennas includes a first number of antennas, the first subset of antennas includes a second number of antennas, the second number of antennas is at least two, and the second number of antennas is less than the first number of antennas; and

    the first subset of antennas transmits the wireless power transmission waves with the at least one waveform characteristic to cause each of the wireless power transmission waves to constructively interfere with another wireless power transmission wave at the receiver.

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