Main switch control circuit in power factor correction circuit
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United States of America Patent
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Jun 27, 2017
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N/A
app pub date -
Dec 4, 2013
filing date -
Feb 1, 2013
priority date (Note) -
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Abstract
A control circuit in a power factor correction (PFC) circuit includes: a multiplier, used for multiplying a voltage sampling signal by a feedback signal, and outputting a first signal; and a waveform generating module, used for generating a second signal related to a filter capacitor connected in parallel to an input end and/or an output end of a rectifier bridge. A control signal for controlling a state of a main switch transistor is generated by using the first signal, the second signal, and a current sampling signal of the main switch transistor in the PFC circuit.
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