Charging system including transmit coil current sensing circuitry
First Claim
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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Accused Products
Abstract
A system for transferring power to, and communicating with, at least one body-implantable active device includes an external power transfer system associated with an external device disposed outside of a body, operable to transfer power through a dermis layer to each body-implantable active device, and communicate data to and from each body-implantable active device, and also includes a power receiving system associated with each body-implantable active device, operable to receive power transferred from the external power transfer system, and communicate data to and from the external power transfer system. The body-implantable active device may include an implantable neurostimulation system.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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:
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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 serial back telemetry receive data stream received from the BIAD, and further operable to generate a second output signal reflective of changes in the transmit coil peak resonant current that occur at a lower frequency than the serial back telemetry receive data stream and which second output signal corresponds to an indication of power being coupled to the BIAD; 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 in response to a de-tune signal 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 assert the de-tune signal in accordance with a serial back telemetry transmit data stream, and intermittently assert the de-tune signal at a lower rate than the serial back telemetry transmit data stream to modulate power coupled to the BIAD. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification