Active discharge of a coupling capacitor in an implantable medical device
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United States of America Patent
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Jan 23, 1996
Grant Date -
N/A
app pub date -
Sep 12, 1994
filing date -
Sep 12, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An active discharge circuit for use within an implantable medical device, such as a pacemaker, rapidly discharges a coupling capacitor connected between a therapy circuit and body tissue. The active discharge circuit has a switching device, a charge transfer capacitor, and a clock. The clock is coupled to a control input of the switching device and provides a clock signal thereto. In response to the clock signal, the switching device sequentially and repeatedly couples the charge transfer capacitor to a discharge voltage supply so that charge transfers therebetween, and then couples the charge transfer capacitor to the coupling capacitor so that charge transfers therebetween. As the switch oscillates in response to the clock signal, the coupling capacitor is actively discharged.
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