一种新的软开关推挽直流变换器研究

Research on soft switching push-pull DC-DC converter

本文提出了一种LCL谐振式推挽电路拓扑,谐振元件位于推挽电路变压器的原边;分析了电路的两种工作模式,通过分析可知,谐振电路参数决定谐振频率,同时影响谐振电流幅值;以600W样机为基础,进行了仿真分析与实验,实验表明提出的电路拓扑很好地实现了零电压开通和零电流关断,验证了拓扑的正确性和有效性。

A new LCL resonant DC/DC push-pull converter topology is presented. The resonant components of it are located in the input side of the push-pull converter. The two work modes of it are analyzed. The analysis results show that the resonant circuit parameters determine the resonant frequency and affect the resonant current amplitude. The new converter topology is tested through the simulation and experiments based on a 600W prototype. The new topology can operate with the zero-voltage switching （ZVS） and zero-current switching （ZCS） conditions. The test results show that the proposed topology is practical and reasonable