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Methods and apparatus for implementing presence and usage pattern detection in wireless charging applications

  • US 10,411,512 B2
  • Filed: 04/05/2016
  • Issued: 09/10/2019
  • Est. Priority Date: 04/10/2015
  • Status: Expired due to Fees
First Claim
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1. An apparatus for wirelessly transferring charging power, comprising:

  • a coupler configured to generate a wireless field for charging a chargeable device in response to being driven with a time-varying current, the wireless field being at a power level that is sufficient to charge the chargeable device;

    a measurement circuit configured to determine a parasitic capacitance between the coupler and ground based on a presence of one or more objects in the wireless field while the coupler generates the wireless field;

    a communication circuit configured to receive a connection request from the chargeable device; and

    a controller circuit configured to;

    determine a presence of a foreign object in response to the determined parasitic capacitance satisfying a detection criteria; and

    determine a presence of the chargeable device for wireless charging in response to determining the presence of the foreign object and receiving the connection request.

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