POWER FACTOR CORRECTION (PFC) CONTROLLER AND BRIDGELESS PFC CIRCUIT WITH THE SAME
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United States of America Patent
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Issued Date -
Sep 26, 2013
app pub date -
Mar 25, 2012
filing date -
Mar 25, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power factor correction (PFC) controller for controlling at least a switching unit is provided. The PFC controller has a feedback control circuit, a conductive current detecting circuit, and a switching control circuit. The feedback control circuit generates a feedback control signal for turning off the switch according to a feedback voltage signal. The conductive current detecting circuit has a clamp circuit, which generates a clamped signal restricted in a positive potential varying range according to a negative potential portion of a conductive-current detecting signal, and generates a cutoff signal for turning off the switch according to at least the clamped signal. The switching control circuit is utilized for controlling the switch according to the feedback control signal and the cutoff signal.
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