高输入输出变比的两级式DC/DC变换器  

Two-stage DC/DC converter for high voltage input low voltage output case

作　　者：张玄[1] 宁国云 毛康宇 黄声华[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074 [2]大禹电气科技股份有限公司,湖北孝感432000

出　　处：《电源技术》2011年第11期1425-1428,共4页Chinese Journal of Power Sources

摘　　要：两级式变换器比单级式变换器更适合应用在输入输出变比较高的DC/DC变换场合。研究了一种Buck+LLC谐振全桥的电路拓扑,阐述了LLC谐振全桥的原理和特性,在分析了这种两级变换器的稳定性基础上,通过合理选取前级Buck电路的输出电压、后级LLC谐振全桥变压器变比和谐振元件参数,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1 kW,210～270 V输入,27 V输出的原理样机,并给出了实验结果。Two-stage converter is more applicable than the single-stage converter for high voltage input low voltage output case.A Buck ＋ LLC resonance full bridge topology was introduced in this paper.The operation principles and the characteristics of the LLC resonance full bridge topology were introduced.Then based on stability analysis of the two-stage converter,a high efficiency was achieved via rationally choosing the output voltage of front stage Buck circuit,the transformer turn ratio and resonance elements values of the end stage LLC resonance full bridge circuit.Finally,a 1 kW converter was designed,which had 210-270 V input and 27 V output.Then the experiment result was given.

关 键 词：两级式变换器 LLC谐振全桥 稳定性分析 

分 类 号：TM53[电气工程—电器]