基于氮化镓器件和矩阵变压器的高频LLC直流变压器  

High Frequency LLC DC-DC Transformers With A Ga N Transistor and A Matrix Transformer

作　　者：任仁[1] 刘硕[1] 张方华[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2015年第13期3373-3380,共8页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2011AA11A249)~~

摘　　要：随着中转母线变换器(intermediate bus converter,IBC)的发展,其对输出功率和高开关频率的需求不断提高,而氮化镓器件的出现使得变换器的功率密度有了进一步提高的可能。该文分析了氮化镓器件的高频特性和高频工作下的优势,针对现有氮化镓器件驱动设计困难和载流能力差的问题,设计了驱动电路关键参数和驱动回路布局,提出了基于效率优化的LLC直流变压器死区时间和分流支路数的最优解,并优化设计了变压器的结构以减小涡流损耗和漏感感值。最后制作了基于氮化镓器件的300 W、1 MHz的LLC-DCT样机,验证了设计手段的合理性和正确性。The trend in intermediate bus converters is increasing demands for output power and high operating frequencies, while the appearance of Ga N devices will improve the power density of the converter possibly. This paper analyzed the high frequency characteristics of Ga N devices and its advantages at high frequency applications. Owing to difficulties in design and layout of driver circuit, the paper designed the key parameters in the driver circuit and optimizes the layout of the driver loop. An optimized design of resonance parameters aiming for improved efficiency tradeoff between the dead time Td and shunt branch numbers N was investigated. Then, an improved matrix transformer which can enhance the performance of the traditional transformer and decrease the leakage inductor and eddy current losses was proposed. Finally, a 300 W the LLC-DCT prototype was designed on the mentioned approach and some experiments were made.

关 键 词：LLC直流变压器 氮化镓器件 矩阵变压器 死区时间效率最优解 

分 类 号：TM46[电气工程—电器]