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Operating a wireless power transfer system at multiple frequencies

  • US 10,135,303 B2
  • Filed: 05/19/2014
  • Issued: 11/20/2018
  • Est. Priority Date: 05/19/2014
  • Status: Active Grant
First Claim
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1. A receiver device operable in a power transfer mode and a low energy transfer mode in an inductive energy transfer system, the receiver device comprising:

  • an AC-to-DC converter;

    a load operatively connected to an output of the AC-to-DC converter;

    a first receiver coil associated with the power transfer mode;

    a first resonant circuitry associated with a first resonant frequency and coupling the first receiver coil and an input of the AC-to-DC converter;

    an auxiliary receiver coil associated with the low energy transfer mode;

    an auxiliary resonant circuitry coupling the auxiliary receiver coil to the input of the AC-to-DC converter;

    wherein the auxiliary resonant circuitry is associated with a second resonant frequency that is different from the first resonant frequency; and

    a processing device configured to transition the receiver device to the low energy transfer mode from the power transfer mode upon determining that a current draw of the load has decreased below a threshold.

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