Analysis of power factor correction isolated SEPIC rectifiers using inductor detection technique

In this paper an analysis of the CCM operated input current waveshaping technique using inductor voltage sensing for power factor correction (PFC) rectifier based on isolated SEPIC converters is introduced. The voltage conversion ratio of the SEPIC converter is used to derive the operation of control circuit. The duty ratio is obtained by comparing an integral signal of the rectified inductor voltage and a negative ramp carrier waveform. The circuit parameters are designed based on operations of SEPIC converter between DCM and CCM. The small signal modeling is determined and used to design output voltage regulator circuit. The proposed analysis is verified by the circuit experimentation of 100 W SEPIC rectifier.