Object and motion detection in wireless power transfer systems

  • US 10,446,317 B2
  • Filed: 08/25/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A system for providing power wirelessly to a vehicle, the system comprising:

  • a source resonator configured to generate an electromagnetic field to transfer power wirelessly;

    a device resonator configured to be mounted to a vehicle so that the vehicle can position the device resonator within the electromagnetic field generated by the source resonator to receive energy wirelessly from the source resonator;

    power and control circuitry coupled to at least one of the source and device resonators, and configured to regulate the wireless power transfer;

    a first sensor coupled to the power and control circuitry and configured to detect an extraneous object in at least one of a gap between the source and device resonators and a vicinity of the source resonator; and

    a second sensor coupled to the power and control circuitry and configured to detect motion of an object relative to the second sensor in at least one of the gap and the vicinity of the source resonator,wherein when the second sensor generates an output signal indicative of movement of an object relative to the second sensor, the power and control circuitry does not detect an extraneous object based on an output signal generated by the first sensor.

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