Electrosurgical radiofrequency generator having regulated voltage across switching device
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United States of America Patent
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Aug 1, 1995
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N/A
app pub date -
Jul 11, 1994
filing date -
Jul 12, 1993
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Abstract
In an electrosurgical generator having a self-tuning oscillator which includes a switching device and a resonant output network connected between the switching device and a supply rail, an oscillator feedback circuit feeds to the switching device a switching control pulse signal for separately switching the switching device to its 'on' state whilst the voltage across the device is decreasing, the phase of the 'on' point being dynamically variable such that the 'on' time of the device is adjusted so as to regulate the amplitude of the voltage thereacross. This allows reverse conduction of the switching device to be avoided, giving improved efficiency.
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