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Wireless inductive power transfer

  • US 10,141,782 B2
  • Filed: 06/27/2017
  • Issued: 11/27/2018
  • Est. Priority Date: 10/16/2012
  • Status: Active Grant
First Claim
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1. A power transmitter for transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising:

  • an inductor for providing the power signal;

    a power signal generator for driving the inductor to provide the power signal;

    a calibration controller for determining whether a power loss calibration has been performed for the power transmitter and power receiver pairing, the power loss calibration determining an expected relationship between a received power indication provided by the power receiver and a transmitted power indication for the power transmitter;

    a power limiter arranged to restrict a power provided to the inductor based on a power loss calibration;

    a receiver for receiving the received power indications from the power receiver; and

    a detector for detecting a parasitic power consumption based on a deviation between an actual relationship and the expected relationship.

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