AC-DC Converter Using Bridgeless SEPIC

This paper presents a new bridgeless single phase AC-DC converter based on Single Ended Primary Inductance Converter (SEPIC). The proposed rectifier utilizes a bidirectional switch (MOSFET) and two fast diodes. The absence of an input diode bridge and the presence of only one diode in the flowing current path during each switching cycle result in less conduction loss compared to existing PFC rectifiers. In the proposed scheme, DSPIC30F2010 controller is used to produce signals. Experimental circuit of this converter is developed with universal input voltage capability for 20-30V DC output voltage connected to resistive load (incandescent lamp with different watts). Textronics TDS2024B storage oscilloscope is used to store the gate pulses and waveforms.