Three-phase rectifier using a Sepic DC-DC converter in continuous conduction mode for power factor correction

This paper presents an analysis of a three-phase rectifier with high power factor using a Sepic DC-DC converter operating in continuous conduction mode (CCM). The structure is particularly simple and robust. Its main features are: one power processing stage, which can operate as step-down or step-up voltage; lower harmonic distortion in the line current; and natural isolation. The converter works with constant frequency and PWM modulation. A study for steady-state conditions and a design procedure are presented, and experimental results obtained from a laboratory prototype are also presented