Charging system incorporating feedback excitation control of resonant coil driver amplifier
First Claim
1. A system for transferring power and communicating data 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
an excitation circuit coupled to the transmit coil and coupled to the transmit coil driver circuit, being operable to pump energy into the transmit coil driver circuit at a predetermined time during each resonant cycle, irrespective of variations in peak resonant current;
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; and
a power receiving circuit coupled to the receive coil, said power receiving circuit operable to de-tune the receive coil to substantially inhibit received power transferred 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.
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0 Petitions
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
21 Claims
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1. A system for transferring power and communicating data 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 an excitation circuit coupled to the transmit coil and coupled to the transmit coil driver circuit, being operable to pump energy into the transmit coil driver circuit at a predetermined time during each resonant cycle, irrespective of variations in peak resonant current; 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; and a power receiving circuit coupled to the receive coil, said power receiving circuit operable to de-tune the receive coil to substantially inhibit received power transferred 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for transferring power and communicating data 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 resonant transmit coil driver circuit operable to drive at an output thereof the transmit coil with a resonant current at a resonant frequency, wherein the resonant transmit coil driver circuit and the transmit coil together comprise a resonant amplifier circuit; and an excitation circuit having an input coupled to the transmit coil, and having an output, being operable to convey on said output an excitation signal that is coupled to an excitation input of the resonant transmit coil driver circuit to pump energy into the resonant amplifier circuit at a predetermined time during each resonant cycle corresponding to a time when instantaneous transmit coil current, during each resonant cycle, exceeds a predetermined percentage of its peak resonant current, irrespective of variations in the peak resonant current; 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; and a power receiving circuit coupled to the receive coil, said power receiving circuit operable to provide said received power to a power delivery circuit within the BIAD, and further operable to de-tune the receive coil to substantially inhibit power transfer from the transmit coil to the receive coil, and to thereby effect a corresponding change in the transmit coil peak resonant current. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification