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Two-stage power factor correction (PFC) configuration usually suffers from low conversion efficiency due to twice power processing. Detailed analysis and operations of a hybrid mode PFC pre-regulator which employs both active and passive PFC techniques at different time slots are presented. The approach can achieve high power conversion efficiency, as well as low output voltage stresses on switch and bulk capacitor. Furthermore, analyses of PF and losses of components with the circuit inductance are also discussed. Experiments were performed to verify the effectiveness of the approach.