Abstract:Nowadays new generation Power Factor Correction circuits based on "One-Cycle Control (OCC)" technique deliver the high performance of Continuous Conduction Mode (CCM) PFC. OCC does not need the traditional analog multiplier, AC line sensing or fixed oscillator ramp. This paper analysis the theory of OCC and introduce two kinds of PFC ICs using OCC technique. The experiments show both the flexibility and good performance of them. Keywords:Power factor correction; One-Cycle-Control; IR1150S; ICE1PCS01