The Single Ended Primary Inductance Converter (SEPIC) presents several advantages over boost and flyback topologies which make this converter very convenient to be used as Power Factor Preregulator (PFP), specially in distributed power supply systems. Due to this fact, the PWM SEPIC used as PFP is studied in this paper. Stress in components and operation in continuous and discontinuous conduction mode are considered in this paper. The study reveals that both types of PFP control (multiplier approach and voltage-follower approach) can be used in PWM SEPIC, the first one when it operates in continuous conduction mode and the second one when it operates in discontinuous conduction mode. Finally the theoretical analysis is validated in two prototypes (continuous and discontinuous conduction mode).
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