移相全桥软开关直流变换器的设计与实现

Design and Implementation of Phase-Shifting Full-Bridge Soft Switching DC Convertor

在电力电子装置小型化、轻量化的趋势下,可以通过提高开关器件频率来减小储能元件体积,但同时会对整机效率造成影响。针对较大功率的直流变换器,采用移相全桥软开关技术,分析了变换器在整个开关周期中实现零电压开关的6种典型模式工作状态,通过小信号建模得到变换器输入与输出的传递函数,同时介绍了变换器系统结构和参数设计,在此基础上制作了一台功率为1 kW、开关频率为100 kHz的样机。实验结果表明,该设计能够实现高频开关器件的零电压开通,输出纹波小、动态响应好,验证了设计方案的可行性。

Under the trend of miniaturization and light weight of power electronic devices,the volume of energy storage components can be reduced by increasing the frequency of switching devices,but at the same time it will have an impact on the efficiency of the whole machine.Aiming at higher power DC converters,this paper adopts phase-shifted full-bridge soft switching technology to analyze the six typical working states of the converter to achieve zero-voltage switching during the entire switching cycle.The input and output of the converter are obtained through small signal modeling.The transfer function of the output is introduced,and the structure and parameter design of the converter system are introduced.Based on this,a prototype with a power of 1 kW and a switching frequency of 100 kHz is made.Experimental results show that the design can realize zero-voltage turn-on of high-frequency switching devices,with small output ripple and good dynamic response,which verifies the feasibility of the design scheme.