Detecting and deterring foreign objects and living objects at wireless charging stations

  • US 10,128,697 B1
  • Filed: 05/01/2017
  • Issued: 11/13/2018
  • Est. Priority Date: 05/01/2017
  • Status: Active Grant
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First Claim
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1. A method comprising:

  • activating a primary coil in a transmitter to generate an electromagnetic field in response to a receiver being positioned within a predetermined distance from the primary coil, the receiver being coupled to a battery in an electric vehicle for wirelessly receiving power from the transmitter for charging the battery;

    measuring a voltage induced on a sensor coil in response to a foreign object being positioned within the electromagnetic field, the sensor coil comprising a first spiral coupled to a second spiral at a point, the first spiral being spiraled in a first direction away from the point and the second spiral being spiraled in a second direction away from the point;

    determining the foreign object is between the transmitter and the receiver based on the voltage; and

    recording information in a server, the information including a time that the foreign object is determined to be between the transmitter and the receiver.

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