Plural selectable RF oscillators for supplying capacitive loads
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United States of America Patent
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-
Aug 25, 1992
Grant Date -
N/A
app pub date -
Nov 15, 1991
filing date -
Nov 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oscillation circuit having multiple separately addressable oscillator stages for applying RF voltage across selected capacitive loads where each stage includes a power driver, a transformer and a quench/clamp circuit. The oscillation circuit includes one enablement circuit responsive to an externally applied enablement signal and address signal and a common feedback circuit connected between one end of all of the transformers and the enablement circuit. An externally applied address signal and an enable signal selects a particular oscillator stage and initiates action of a power/driver circuit to provide an initial pulse of AC current through the associated transformer for a preset period and the feedback circuit detects negative zero crossovers of the waveform of current through that transformer primary to maintain actuation of the driver circuit for as long as the external enable signal is present.
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