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Systems and methods for limiting voltage in wireless power receivers

  • US 10,128,688 B2
  • Filed: 09/09/2016
  • Issued: 11/13/2018
  • Est. Priority Date: 10/21/2011
  • Status: Active Grant
First Claim
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1. A method for wirelessly receiving power using a wireless power receiver, the method comprising:

  • generating, using a receive coil circuit, an alternating current (AC) signal in response to a magnetic field generated by a transmitter;

    rectifying the AC signal to produce a direct current (DC) signal having an output voltage,determining an operating condition of the receiver based on a comparison of the output voltage to a plurality of threshold voltages, wherein the receiver is determined to be in an overvoltage operating condition if the output voltage is equal to or greater than an overvoltage threshold value, that the receiver is in a high voltage operating condition if the output voltage is below the overvoltage threshold value but above a maximum voltage at which the receiver can operate at a steady state, and that the receiver is in a steady state operating condition if the output voltage is below the maximum voltage at which the receiver can operate at the steady state but above a minimum voltage at which the receiver can operate at the steady state; and

    transmitting a signal to the transmitter indicative of the operating condition of the receiver.

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