Hybrid charging method for wireless power transmission based on pocket-forming

  • US 9,871,398 B1
  • Filed: 12/29/2014
  • Issued: 01/16/2018
  • Est. Priority Date: 07/01/2013
  • Status: Active Grant
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First Claim
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1. A method for wireless power charging, the method comprising:

  • when a receiver coupled to an electronic device is within a threshold distance from a transmitter;

    receiving, by at least one antenna of the receiver, a plurality of wireless power transmission waves transmitted by the transmitter, wherein the plurality of wireless power transmission waves constructively interferes at the receiver;

    converting, by the at least one antenna of the receiver, the plurality of wireless power transmission waves that constructively interfere at the receiver into an alternating current (AC) voltage;

    rectifying, by a rectifier of the receiver, the AC voltage to a direct current (DC) voltage, wherein the rectifier is coupled to the at least one antenna;

    converting, by a power converter of the receiver, the DC voltage to a constant DC voltage output, wherein the power converter is coupled to the rectifier; and

    providing, by the power converter of the receiver, the constant DC voltage output to a backup battery of the receiver to at least partially charge the backup battery, wherein the power converter is coupled to the backup battery; and

    when the receiver is not within the threshold distance from the transmitter, and after providing the constant DC voltage output to the backup battery to at least partially charge the backup battery, draining the backup battery to provide power to a battery of the electronic device.

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