大功率双正激式DC/DC变换器的研究与开发

Research on a Novel Topology for the Double Switching Forward DC/DC Converter

针对一种双正激式开关变换器新型拓扑结构,提出了一种独特的磁通能量维持控制方案,很好地解决了双正激式DC/DC变换器普遍存在的磁通维持阶段不理想问题,并有效解决了上下桥臂易出现直通短路的问题,使开关电源的可靠性大为提高。新拓扑的输入电压可以很高,其输出直流电源容量大、组数多,尤其适用于具有高压直流侧的大功率电力电子系统。在分析主电路和控制等回路结构原理的基础上,结合仿真波形以及实验结果验证了该正激变换器的优点。

A novel topology for the double switching forward converter is provided,which can effectively prevent the top bridge and the bottom bridge from being short-circuited.Moreover,its input voltage can be very high and the capacity of its output DC power source is large,also it can include many groups.Therefore,this scheme is especially applicable to those large power electronic system with high DC vohage.In addition,a novel theme to maintain and continue the flux is provided,which can effectively solve the problems existing in most of double switching forward converter when to maintain and continue the flux.Finally,the validity and application results of the forgoing research are verified by using the analysis of the simulation waves and the experimental results.