Wireless power transmission with selective range

  • US 9,941,754 B2
  • Filed: 12/27/2014
  • Issued: 04/10/2018
  • Est. Priority Date: 07/06/2012
  • Status: Active Grant
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First Claim
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1. A method for wireless power transmission using a selective range to wirelessly deliver power to an electronic device, the method comprising:

  • obtaining, by a transmitter, data included in a signal received from a receiver;

    determining, by the transmitter, a location of the receiver based upon the data included in the signal received from the receiver;

    in response to determining that the location of the receiver is within a predetermined wireless charging area, determining, by the transmitter a selective range for transmitting radio frequency (RF) power waves that constructively interfere within the predetermined wireless charging area, wherein;

    the selective range is defined by (i) a first distance from the transmitter to the predetermined wireless charging area and (ii) a second distance, distinct from the first distance, from the transmitter to the predetermined wireless charging area, andthe location of the receiver is within the selective range; and

    transmitting, by the transmitter using the selective range, a set of RF power waves that;

    constructively interfere within the predetermined wireless charging area, wherein transmitting using the selective range includes transmitting first RF power waves of the set of RF power waves so that they travel the first distance from the transmitter to the predetermined wireless charging area and transmitting second RF power waves of the set of RF power waves so that they travel the second distance from the transmitter to the predetermined wireless charging area, wherein the receiver uses energy from the constructively interfering RF power waves to provide power to an electronic device that is coupled with the receiver; and

    destructively interfere to form null-spaces substantially adjacent to the predetermined wireless charging area.

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