Abstract: A power factor correction controller simultaneously controls several power converters to be operated at a critical conduction mode to improve the overall conversion efficiency and conversion power of the power factor corrector. The controller includes a primary power converter control circuit for feeding back an input voltage signal, an output voltage signal and a primary current signal, and outputting a primary gate control signal for controlling a primary power switch; at least one secondary power converter control circuit for receiving the primary gate control signal and outputting a secondary gate control signal for controlling a secondary power switch; and a phase splitter circuit for receiving the primary gate control signal to control a gate output driving circuit, so that the gate output driving circuit outputs the secondary gate control signal.

Abstract: A power factor correction controller simultaneously controls several power converters to be operated at a critical conduction mode to improve the overall conversion efficiency and conversion power of the power factor corrector. The controller includes a primary power converter control circuit for feeding back an input voltage signal, an output voltage signal and a primary current signal, and outputting a primary gate control signal for controlling a primary power switch; at least one secondary power converter control circuit for receiving the primary gate control signal and outputting a secondary gate control signal for controlling a secondary power switch; and a phase splitter circuit for receiving the primary gate control signal to control a gate output driving circuit, so that the gate output driving circuit outputs the secondary gate control signal.

Abstract: A power factor corrector control device accomplishes control of power factor correction with a simpler and cheaper circuit, overcomes the drawback of higher current harmonics occurred in the prior art, and also accommodates mains voltage distortion. This power factor corrector control device uses a built-in circuit to discriminate the mains frequency, and generates a pure sinusoidal signal having the same frequency with the mains frequency. The product of a feed-forward signal and an output error signal is exploited to get a constant by using a sample-and-hold circuit to determine the amplitude of a reference current signal, hence preventing ripples of the feed-forward signal and the output error signal from generating distortion of the reference current signal after circuit operation. Moreover, a division approximate circuit is used to accomplish simple feed-forward control so as to apply to various different mains voltage levels.