CPC A61N 1/39622 (2017.08) [A61N 1/3968 (2013.01); A61N 1/3975 (2013.01)] | 13 Claims |
1. An implantable defibrillator comprising a housing and operational circuitry therein, the operational circuitry comprising:
at least one battery;
at least one high power capacitor;
a DC:DC conversion circuit configured to charge the at least one high power capacitor using current drawn from the at least one battery;
an H-bridge output circuit comprising first and second high side legs and first and second low side legs, each leg comprising a switch, the first high side and first low side legs coupled together at a first output node, and the second high side and second low side legs coupled together at a second output node;
a current monitoring subcircuit coupled to the first and second low side legs, the current monitoring subcircuit adapted to receive current through both of the first and second low side legs; and
a current control subcircuit coupling the at least one high power capacitor to the first and second high side legs, the current control subcircuit configured to receive a feedback signal from the current monitoring subcircuit to control current through the H-bridge;
wherein the current control subcircuit comprises a bootstrap circuit coupled to a first transistor that is configured to enable current flow to the H-bridge from the at least one high power capacitor.
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