一种新颖的三电平全桥谐振型软开关DC/DC变流器  

A Novel Three Level Full Bridge Resonant DC/DC Converter Suitable for High Power Wide Range Input Applications

作　　者：陈威[1] 吕征宇[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2008年第3期52-59,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50677063ZD);台达电力电子科教发展基金(2006-2007)资助项目

摘　　要：为了能达到同时兼容单/三相的PFC变换器输出的目的,提出了一种新颖的三电平全桥谐振型软开关DC/DC变流器。该变流器在结合了LLC拓扑和三电平技术所有优点的基础上,利用了全桥结构从而能够适用于大功率的应用,为兼容400V/800V的单/三相系统创造了条件。通过对该变流器工作状态描述、理论深入分析和损耗计算,以及一台1kW,54V/20A输出样机的实验,验证该变流器的输入范围可以达到400～800V,同时保持了一次主开关ZVS、二次整流二极管ZCS的优点。由于采用了磁集成技术,整个变流器只使用一个磁元件。因此,该变流器特别适合于系统集成的场合,对电源产业简化产品结构和降低成本具有积极意义。To make downstream DC/DC converters compatible with both single and three phases PFC stages for system integration, a novel three-level full bridge resonant DC/DC converter is proposed. This converter combines the LLC topology, which maintains merits as ZVS for all primary side main switches and ZCS for secondary side diodes under wide range inputs, and the three-level technique, which is suitable for high voltage input applications. In addition, full bridge configuration endows the high power capability to the proposed converter. The detail operation principles, as well as the design considerations and loss calculation, are presented. The validity and applicability are also verified by a lkW, 54V/20A output prototype, while the maximum efficiency reaches 96.2%. Therefore, the proposed converter is very attractive for the system integration applications which have requirement to be compatible with 400V and 800V PFC systems, while high power capability must be taken into account. Consequently, it is of practical significance for industry to simplify power supply＇s variety and lower cost.

关 键 词：系统集成 三电平 谐振型DC/DC变流器 大功率 宽范围电压输入 

分 类 号：TM46[电气工程—电器] TM13