软开关PWM Boost型全桥变换器的仿真研究

Simulation Research on Soft-Switching PWM Boost Type Full-Bridge Converter

文章着重分析了实现软开关的可能性和方法。若要实现软开关,必须将变换器的四只开关管分为前导管和延后管,并且前导管只能实现零电流开关(Zero-Current-Switching),延后管既可以实现零电流开关,又可以实现零电压开关(Zero-Voltage-Switching)。对文中提出的ZCZVS PWM Boost型全桥变换器的拓扑参数进行了详细的计算与设计。最后,基于MATLAB/SIMULINK平台,搭建了软开关PWM Boost型全桥变换器的仿真模型,仿真结果表明,该拓扑能够实现前导管的ZCS和延后管的ZVS,克服了传统ZCS型变换器存在的电流占空比丢失、变压器设计困难等缺点。

This paper focuses on the possibility and method of realizing soft-switching. The four switches of the converter must be divided into front and rear tubes to achieve soft-switching. It is pointed out that the front pipe can only realize ZCS（ Zero-Current-Switching）,and the delay tube can realize ZCS and ZVS（ Zero-Voltage-Switching）. Then,the topology parameters of ZCZVS PWM Boost type full bridge converter are calculated and designed in detail. Finally,based on the MATLAB/SIMULINK platform,the simulation model of the soft-switching PWM Boost type full-bridge converter is built. The simulation results show that the topology can realize the ZCS of the front tube and the ZVS of the delay tube,which overcomes the traditional ZCS converter existence of current duty cycle loss,transformer design difficulties and other shortcomings.