A Simple Method for Reducing the Transient Oscillation in Single-Phase Buck Rectifiers

Abstract

The single-phase buck rectifier has several advantages, such as the controllability of lower dc output voltages, and negligible inrush input-current at start-up. However, the rectifier requires an LC-filter connected on the input side of the switching device to absorb the harmonics caused by the on and off behavior. The LC-filter involves an LC resonance in transient states. To solve this problem, a suppression approach using only a series RLC circuit, which selectively acts as a damping at around the resonant frequency, is proposed. Simulation and experimental results confirm the validity of this method.