Wireless power transfer frequency adjustment

  • US 9,857,821 B2
  • Filed: 08/14/2014
  • Issued: 01/02/2018
  • Est. Priority Date: 08/14/2013
  • Status: Active Grant
  • ×
    • Pin
First Claim
Patent Images

1. A wireless power transfer system, comprising:

  • a power transmitting apparatus configured to wirelessly transmit power;

    a power receiving apparatus connected to an electrical load and configured to receive power from the power transmitting apparatus;

    a detector comprising;

    a first input terminal configured to receive a first electrical signal comprising information about an output voltage waveform of a power source of the power transmitting apparatus;

    a second input terminal configured to receive a second electrical signal comprising information about an output current waveform of the power source of the power transmitting apparatus;

    a first logic unit connected to the first and second input terminals and configured to produce a first output waveform based on the first and second electrical signals; and

    a second logic unit connected to the first logic unit and configured to produce a second output waveform based on the first output waveform, wherein the second output waveform comprises a pulse having a width that corresponds to a phase difference between the output voltage and current waveforms; and

    a controller connected to the power transmitting apparatus and to the detector, and configured to;

    receive the second output waveform; and

    adjust a frequency of the transmitted power based on the phase difference.

View all claims