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Wireless power transmitter and method of error detection during use thereof

  • US 10,673,249 B2
  • Filed: 06/13/2019
  • Issued: 06/02/2020
  • Est. Priority Date: 10/02/2014
  • Status: Active Grant
First Claim
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1. A method of detecting a foreign object presence between a wireless power transmitter and a wireless power receiver, said wireless power transmitter comprising a primary coil for transferring power wirelessly to a secondary coil of said wireless power receiver, the method comprising:

  • transmitting a calibration ping signal;

    measuring and recording decay time of said calibration ping signal;

    transmitting test ping signal;

    measuring and recording decay time of said test ping signal; and

    determining said foreign object presence if the decay time of said test ping signal is smaller than decay time of said calibration ping signal and if a value of a difference between them is above a threshold.

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