Enhanced receiver for wireless power transmission

  • US 9,819,230 B2
  • Filed: 05/07/2014
  • Issued: 11/14/2017
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
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First Claim
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1. A wireless power receiver, comprising:

  • an antenna element configured to convert received energy from two or more radio frequency (RF) signals transmitted by a wireless power transmitter that converge at a location of the antenna element to form a constructive interference pattern into an alternating current;

    a rectifier, operatively coupled to the antenna element for converting the alternating current into a direct current with a first voltage;

    an input boost converter, operatively coupled to the rectifier, the input boost converter being configured to step up the first voltage to a second voltage greater than the first voltage;

    a storage element, operatively coupled to the input boost converter, the storage element being configured to receive and store the second voltage;

    an output boost converter, operatively coupled to the storage element, the output boost converter configured to step up the second voltage to a third voltage greater than the second voltage;

    a switch, connected to an output of the output boost converter, that selectively provides the third voltage to a load of an electronic device that is coupled to the wireless power receiver; and

    a controller, operatively coupled to the output boost converter, wherein the controller is configured to;

    receive at least one measurement of a respective voltage level at a node located after at least one of;

    (i) the rectifier;

    (ii) the input boost converter; and

    (iii) the storage element;

    andcontrol operation of the input boost converter and output boost converter based, at least in part, on;

    (i) the at least one measurement of the respective voltage level, and (ii) determined load requirements for the load; and

    close the switch in accordance with a determination that the electronic device is authorized to be wirelessly charged by the wireless power transmitter.

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