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Systems, methods and apparatus for guidance and alignment between electric vehicles and wireless charging systems

  • US 10,566,839 B2
  • Filed: 03/14/2016
  • Issued: 02/18/2020
  • Est. Priority Date: 06/30/2015
  • Status: Active Grant
First Claim
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1. An apparatus for determining a relative position of a wireless power transmitter from a wireless power receiver, comprising:

  • a driver circuit configured to generate a first signal oscillating at a first frequency and a second frequency separated from the first frequency by a first frequency spacing and a second signal oscillating at a third frequency that is separated from the second frequency by a second frequency spacing that is equal to the first frequency spacing;

    a first generator coil configured to generate a first alternating magnetic field oscillating at the first frequency and the second frequency when driven by the first signal;

    a second generator coil configured to generate a second alternating magnetic field oscillating at the third frequency when driven by the second signal, the first generator coil or the second generator coil also configurable to wirelessly transfer charging power from the wireless power transmitter; and

    a processor configured to determine the relative position of the wireless power transmitter based on signals derived from the first and second alternating magnetic fields.

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