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Wireless inductive power transfer

  • US 9,479,013 B2
  • Filed: 08/06/2014
  • Issued: 10/25/2016
  • Est. Priority Date: 08/07/2013
  • Status: Active Grant
First Claim
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1. An apparatus for a wireless power transfer system including a power transmitter and a power receiver, the power transmitter being arranged to generate a wireless inductive power transfer signal for powering the power receiver during a power transfer phase, the apparatus comprising:

  • a first communication unit for communicating with a second communication unit of a first entity using an electromagnetic communication signal, the first entity being one of the power receive and the power transmitter;

    a reference processor for measuring and storing a reference value of a characteristic of the communication signal;

    a measurement unit for determining a measured value of the characteristic of the communication signal during the power transfer phase;

    a comparator for comparing the measured values to the reference value; and

    an initiator for triggering an entity detection process if the comparison indicates that a measured value and the reference value do not meet a similarity criterion, the entity detection process being arranged to detect a presence of an entity other than the first entity.

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