AC to DC converter with unity power factor
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United States of America Patent
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-
Jul 10, 1990
Grant Date -
N/A
app pub date -
Jun 23, 1989
filing date -
Jun 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An AC to DC converter comprises a bridge rectifier followed by a boost circuit. The boost circuit includes an inductor, diode and load capacitor in series and a shunting switch connected to shunt the diode and load capacitor. The control circuit for switching the shunting switch comprises a differential circuit, a multiplier and a duty cycle generator in a feedback loop which maintains a constant output voltage on the capacitor. To eliminate the response to ripple on the output voltage, the differential circuit does not respond to voltages within a dead band.
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