High efficiency telecom rectifier using a novel soft-switched boost-based input current shaper

Abstract

A novel snubber circuit for the constant frequency pulsewidth-modulation (PWM) boost converter is presented to provide soft-switching transitions for the power switches and thus to reduce the power losses, component stresses, and noise generation. The proposed topology is very useful for the input current shapers in AC-AC applications. The operation of the circuit including its control block is explained and illustrated for a 1.5 kW, 100 kHz high-performance power-factor-corrected telecommunication rectifier.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>