Resistance feedback controlled power supply
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United States of America Patent
Stats
-
Oct 4, 1994
Grant Date -
N/A
app pub date -
May 1, 1992
filing date -
May 1, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power supply for use with resistively-heated surgical instruments is provided, wherein accurate temperature regulation is achieved employing a resistance feedback circuit. The power supply powers the surgical instrument with an AC voltage waveform, and applies a fixed, low level DC signal to the heating element to produce a DC signal proportional to the instantaneous resistance of the heating element. The DC signal is compared to a setpoint value to obtain a control signal for adjusting the power delivered to the instrument to maintain a substantially constant heating element temperature, even under varying thermal loads.
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