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Inductively coupled power transfer systems

  • US 10,840,748 B2
  • Filed: 11/05/2013
  • Issued: 11/17/2020
  • Est. Priority Date: 11/05/2012
  • Status: Active Grant
First Claim
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1. A wireless power transmitter comprising:

  • a plurality of wireless power transmitter coils;

    a detector configured to detect a presence of a potential wireless power receiving device proximate a surface of the wireless power transmitter; and

    a controller configured to;

    in response to detecting the presence of the potential wireless power receiving device proximate the surface of the wireless power transmitter, perform a scan to evaluate coupling between the wireless power transmitter coils and one or more receiver coils, the scan including measuring inrush current, wherein more than one frequency is used for measuring inrush current;

    determine a type of the potential wireless power receiving device based on the measured inrush currents, wherein a wireless power receiving device is detected by a peak inrush current over a frequency range of the more than one frequency and wherein a foreign object is detected using a flat inrush current over the frequency range; and

    perform wireless power transfer using one or more of the plurality of wireless power transmitter coils based on the determined type of the potential wireless power receiving device.

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