Abstract
The present invention relates to a power factor corrector control device accomplishes control of power factor correction with a simpler and cheaper circuit which 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.