Wireless powering of electronic devices with selective delivery range

  • US 10,224,758 B2
  • Filed: 11/01/2013
  • Issued: 03/05/2019
  • Est. Priority Date: 05/10/2013
  • Status: Active Grant
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First Claim
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1. A method for wireless power transmission comprising:

  • transmitting, by a plurality of antennas of a transmitter, a plurality of power waves forming a constructive interference pattern at a location of a receiver, wherein the receiver is configured to receive power waves only from the transmitter when the receiver is within a predefined distance threshold from the transmitter;

    detecting, by a controller of the transmitter and based on communications signals received from the receiver, that the receiver has moved to a new location;

    in response to detecting that the receiver has moved to the new location, determining, by the controller of the transmitter, whether the new location of the receiver is within the predefined distance threshold;

    in response to determining by the controller of the transmitter that the new location is within the predefined distance threshold;

    adjusting, by the controller of the transmitter, the plurality of antennas such that transmission of the plurality of power waves forms a new constructive interference pattern at the new location of the receiver; and

    in response to determining that the new location is not within the predefined distance threshold;

    providing, by the transmitter, an indication that the receiver is not within the predefined distance threshold, wherein the receiver is configured to be functionally inoperable upon exceeding the predefined distance threshold from the transmitter.

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