CPC H02M 1/4225 (2013.01) [H02M 1/32 (2013.01); H02M 1/44 (2013.01)] | 21 Claims |
1. A method for controlling a power factor correction (PFC) circuit, the method comprising:
detecting that an input voltage is in a first half cycle having a first polarity;
applying a PWM signal to a first transistor of a fast-leg portion of the PFC circuit for a conversion process corresponding to the first half cycle;
detecting that the input voltage is at a first polarity change;
pausing the PWM signal; and
applying a pulse sequence to a second transistor of the fast-leg portion of the PFC circuit to change a voltage on an EMI capacitor from a first voltage corresponding to the first half cycle to a second voltage corresponding to a second half cycle having a second polarity opposite the first polarity.
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