Comparative study of unity power factor circuits

This paper investigates the use of boost and Cuk topologies in unity power factor correction circuits. The topologies include classical switched mode power supply, quasi-resonant zero current switching and extended-period quasi-resonant circuits. They all operate with continuous input current. Control methods are presented. They are duty ratio, switching frequency and constant frequency-extended period. The implications of power factor, harmonic distortion and switching frequency on the topologies are presented in order to compare performance