| 摘要 |
<p>The present invention relates to a PFC control circuit, an active PFC circuit, and a PFC controlling method. The PFC control circuit provided by an embodiment of the present invention includes: an inductor current sensing unit which senses an inductor current of a PFC circuit; an output voltage feedback unit which outputs a feedback output signal by feeding back an output voltage sensed from an output of the PFC circuit; a sensing and feedback signal applying unit which outputs a sensing voltage signal sensed in the inductor current sensing unit in a switching duty-on of the PFC circuit, adds the feedback output signal to the sensing voltage signal, and outputs the added signal in a switching duty-off of the PFC circuit; and a PFC control unit which generates a comparison signal from the output of the sensing and feedback applying unit so that a distribution is removed or reduced by an internal offset and generates and outputs a duty control signal controlling a switching duty from the comparison signal and a first reference signal. The active PFC circuit and the PFC controlling method are also provided.</p> |
