Analysis and simulation of LLC resonant converter with voltage-doubling rectifier

Abstract

A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary side, voltage stress of two output capacitors are half of output voltage and extra voltage balance circuit is excluded. Voltage and current stress of two output rectifier diodes are equal to output voltage and current, respectively. The working principle of the converter and the soft switching process are analyzed in detail in this paper. Simulation and experiment results are in positive to the analysis showing the feasibility of the proposed method.