Method and circuit to bias output-side width modulation control in an isolating voltage converter system
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United States of America Patent
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-
Jan 21, 2003
Grant Date -
Dec 26, 2002
app pub date -
Jun 25, 2001
filing date -
Jun 25, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The output-side referenced pulse width modulator (PWM) in an isolation-providing voltage converter receives at least initial bias voltage (Vbias) from a charge-pump like Vbias generator. The Vbias generator includes an input-side referenced periodic waveform generator whose output signal can be amplified differentially with an input-side referenced circuit and then AC-coupled via isolation-maintaining capacitors to an output-side referenced rectifier circuit whose output is Vbias. The Vbias thus generated can power the PWM at least from power-up through commencement of steady-state operation, when a more robust Vbias can be derived from the output-side voltage itself. Since the PWM is output-side referenced, high feedback bandwidth is maintained.
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