一种新型的双向全桥直流变换器控制策略  

A novel control strategy of bi-directional full bridge DC/DC converter

作　　者：黄知超[1] 黄祥莉 廖志剑 

机构地区：[1]桂林电子科技大学,广西桂林541004

出　　处：《电测与仪表》2016年第7期74-77,83,共5页Electrical Measurement & Instrumentation

基　　金：广西科学与技术开发攻关项目(桂科攻:14122007-1);广西制造系统与先进制造技术重点实验室项目(13-051-09-001Z)

摘　　要：隔离型双向全桥直流变换器在传统移相控制策略中,存在功率回流现象,并且由于变换器特性参数不一致将使得变压器初级产生直流分量而导致偏磁问题。提出了一种新型的PWM加移相控制策略,完全消除了功率回流和偏磁现象。给出了偏磁抑制过程,对隔离型双向全桥直流变换器运行时各模态进行了运行特性分析,并在Psim软件中对其进行建模仿真。仿真结果表明,将新型PWM加移相控制策略应用于隔离型双向全桥直流变换器中,能对直流偏磁以及功率回流进行有效抑制,证明了所提出方法的正确性和可行性。With the traditional phase-shift control strategy using in isolated full-bridge bi-directional DC / DC converter,power circulating flow phenomena exsits. Because of the difference of the characteristics,parameters of converter,the primary side of the transformer will cause the DC component. Magnetic bias problem will be caused by the DC component finally. According to this phenomena,a new kind of PWM plus phase-shift control strategy is put forward in this paper. The phenomena of power circulating flow and magnetic bias are eliminated completely with that strategy. The control process of magnetic bias has been given. Running characteristics of each model in the isolated fullbridge bi-directional DC / DC converter has been analyzed and the model has also been built in Psim software. The simulation results show that the new kind of PWM plus phase-shift control strategy using in the isolated full-bridge bidirectional DC / DC converter can restrain the power circulating flow and magnetic bias. The correctness and feasibility of the new method has been verified.

关 键 词：双向全桥 功率回流 偏磁抑制 双闭环控制 

分 类 号：TM46[电气工程—电器]