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Wireless power receiver and/or foreign object detection by a wireless power transmitter

  • US 9,939,539 B2
  • Filed: 03/25/2015
  • Issued: 04/10/2018
  • Est. Priority Date: 04/04/2014
  • Status: Active Grant
First Claim
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1. A wireless power transmitter, comprising:

  • a power train comprising at least one transistor coupled to an LC tank circuit;

    an analog-to-digital converter (ADC) coupled to receive and convert an analog signal associated with the power train to digital values;

    a controller coupled to the tank circuit and being configured to;

    cause pulses generated by the controller to be applied to the at least one transistor of the power train to thereby cause the LC tank circuit of the power train to begin ringing;

    receive digital values from the ADC acquired while the power train is ringing and after the pulses are completed; and

    based on an analysis of the digital values of the ringing of the power train, to determine whether a wireless power receiver is present on or near the wireless power transmitter or whether a foreign object is present on or near the wireless power transmitter.

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