摘要
移相全桥零电压开通ZVS(zero voltage switching)直流变换器具有工作频率恒定、拓扑结构简单、功率密度高且能利用器件自身的寄生参数谐振实现ZVS等特点,在中高功率应用场合中备受青睐。然而,传统移相全桥ZVS变换器软开关范围有限,存在环流损耗、副边占空比丢失以及整流桥寄生振荡等缺陷。针对移相全桥ZVS变换器存在的问题进行了分析,对典型的拓扑结构和调制策略进行分类,比较了各方案的优势与不足,并提出了一种基于互补占空比的改进方案,建立模型并进行了仿真验证。
Owing to their characteristics of constant frequency operation,simple topology,high power density and utilizing the resonance between their own parasitic parameters to realize zero voltage switching(ZVS),phase-shifted fullbridge ZVS DC-DC converters are favored in medium-and high-power applications.However,the conventional phaseshifted full-bridge ZVS converters still have drawbacks such as limited soft switching range,loss of circulating currentrelated power,loss of secondary-side duty cycle,and parasitic oscillation on rectifier diodes.These drawbacks lead to the limitation of their optimization performance,which also becomes a hot issue that scholars are trying to explore.In this paper,the existing problems in phase-shifted full-bridge ZVS converters are analyzed.The typical topological structures and modulation strategies are classified,and the advantages and disadvantages of each scheme are compared by combining the corresponding characteristics.On the basis of the above summary,a novel improved scheme based on complementary duty cycle is proposed.Finally,a model is built and simulated to verify the feasibility of the proposed scheme.
作者
许章茁
潘健
XU Zhangzhuo;PAN Jian(Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430068,China)
出处
《电源学报》
CSCD
北大核心
2022年第4期11-27,共17页
Journal of Power Supply
基金
太阳能高效利用及储能运行控制湖北省重点实验室开放基金资助项目(HBSEES201902)。
关键词
全桥变换器
零电压开关
拓扑结构
调制策略
互补占空比
full-bridge converter
zero voltage switching(ZVS)
topological structure
modulation strategy
complementary duty cycle
