摘要
传统零电压全桥DC-DC变换器存在的两个典型缺陷:滞后桥臂实现零电压时负载范围窄;变压器二次侧电压存在十分明显的电压过冲、电压振荡及占空比丢失现象。本文提出具有移相控制的新型全桥DC-DC斩波变换器,它分别采用无源辅助网络、无损缓冲电路等方法克服了以上缺陷。文中详细分析了该新型变换器的工作原理以及变换器各个阶段的工作模态,同时也分析了此变换器实现软开关的条件及辅助电路的参数设计。为了验证该拓扑结构的相关功能,文中搭建了一台24V/3A,100k Hz的实验样机。实验结果验证了该拓扑结构的正确性,并证明了这种新型拓扑结构有效地解决了传统零电压全桥变换器中存在的缺陷,提升了系统性能。
The traditional zero-voltage-switch(ZVS) full-bridge(FB) converter owns two typical defects: one is that the load arrange is narrow for lagging leg to achieve ZVS and the other is that there is obvious voltage overshoot, voltage shock and loss of duty cycle exists on the transformer secondary side. In this paper, a passive auxiliary circuit and a non-dissipative buffer circuit based on phase-shift control are utilized to solve problems mentioned above. Furthermore, the paper also specifically analyzes the principle, operation modes and the necessary condition of soft switching. In order to verify the function of this novel DC-DC ZVS converter, an experimental prototype of 24V/3A, 100 k Hz was built up. Experimental results prove that the converter can achieve ZVS at a wide load range and improve the performance of this novel converter effectively.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第12期66-72,共7页
Transactions of China Electrotechnical Society
