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Charging system including transmit coil current sensing circuitry

  • US 9,757,575 B2
  • Filed: 11/09/2016
  • Issued: 09/12/2017
  • Est. Priority Date: 01/06/2016
  • Status: Active Grant
First Claim
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1. A system for communicating between and for transferring power from an external power transfer system (EPTS) to at least one body-implantable active device (BIAD) through a dermis layer, said system comprising:

  • an EPTS for being disposed external to a dermis layer of a body; and

    a BIAD for being disposed beneath the dermis layer of the body;

    the EPTS including;

    a transmit coil;

    a transmit coil driver circuit operable to drive the transmit coil with a resonant current at a resonant frequency; and

    a telemetry receiver circuit coupled to the transmit coil, operable to generate a first output signal reflective of changes in transmit coil peak resonant current corresponding to a first frequency range, and further operable to generate a second output signal reflective of changes in the transmit coil peak resonant current corresponding to a lower frequency than the first frequency range;

    the BIAD including;

    a receive coil tuned to the resonant frequency of the transmit coil and operable to inductively receive power therefrom when in proximity thereto;

    a power receiving circuit coupled to the receive coil, said power receiving circuit operable to de-tune the receive coil to substantially inhibit power transfer from the transmit coil to the receive coil, and to thereby decrease transmit coil loading and effect a corresponding change in the transmit coil peak resonant current; and

    a de-tune control circuit coupled to the power receiving circuit, and operable to intermittently de-tune the receive coil at a first rate corresponding to the first frequency range, and further operable to intermittently de-tune the receive coil at a second rate lower than the first frequency range.

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