摘要
在输入输出变比较高的DC/DC变换场合,两级式变换器比单级式变换器具有更大的优势。研究了一种Buck+倍流整流不对称半桥的电路拓扑,阐述了该两级式拓扑的优点和控制方法。通过合理选取前级Buck电路的输出电压和对后级不对称半桥占空比的优化设计,使不对称半桥工作在功率均匀分配及实现ZVS的最佳状态,提高了两级变换的效率。基于上述分析,采用该拓扑结构试制了一台功率1kW,200～400V输入、24V输出的原理样机,并给出了实验结果。
Compared to the single-stage converter,two-stage converter is more applicable for high voltage input low voltage output case.This paper introduces a Buck＋current doubler asymmetric half-bridge topology.Advantages of this topology and operation principles are analyzed.Then this article puts a key research on the output voltage of front stage Buck and the duty cycle of asymmetry half bridge,making sure that the power distribution of asymmetry half bridge is equal,and the system runs under a best ZVS condition.Basing on the above analysis and through the design of system parameters,a 1 kW Buck＋ current doubler asymmetric half-bridge converter is designed,which has 200～400 V voltage input and 24 V voltage output.Then the experiment result is given.
出处
《电力电子技术》
CSCD
北大核心
2010年第1期29-30,33,共3页
Power Electronics
关键词
变换器
倍流
不对称半桥
占空比
converter
current-doubler
asymmetry half bridge
duty cycle
