高效率二次整流电路  

High Efficiency Capacitive Rectifier Configuration

作　　者：谢小高[1] 赵晨[1] 刘士荣[1] 钱照明[2] 

机构地区：[1]杭州电子科技大学,杭州310018 [2]浙江大学,杭州310027

出　　处：《电工技术学报》2013年第5期243-249,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51007015);浙江省重大科技专项(2009C11020)资助项目

摘　　要：传统中心抽头式容性二次整流电路因其在变换效率及功率密度方面的优势被广泛应用于电流型DC-DC变流器中,如LLC谐振变流器及隔离型推挽Boost变流器等。但是因变压器二次漏感与整流管寄生结电容在换流时产生的寄生振荡所引起的电压尖刺增加了整流管的电压应力,限制了更低耐压等级整流管的应用,不利于整机效率及功率密度的进一步提高。另外,传统中心抽头式容性二次整流电路具有较大的电流纹波,增加了导通损耗及输出滤波器的设计难度。本文对改进型容性二次整流电路进行了深入地分析研究,利用飞跨平衡电容能够有效实现二次整流管电压应力钳位及输出电流纹波抑制,从而显著提高整机的变换效率,降低输出滤波器的设计难度。Due to the advantages in conversion efficiency and power density,the traditional center-tapped capacitive secondary-side rectifier configuration is widely used in current mode DC-DC converters,such like LLC resonant converter,isolated push-pull boost converter,and etc.However,the oscillation occurring between the secondary-side leakage inductance of the power transformer and the parasitic junction capacitor of the rectifier during the transition interval increases the voltage stress across the rectifier a lot.It has to use the rectifier with higher breakdown voltage rating,which restricts the improvement of the whole conversion efficiency further.Additionally,the traditional center-tapped capacitive rectifier configuration suffers high current ripple which increases the conduction loss and the design complexity of the output filter.This paper analyzes the improved capacitive rectifier configuration in detail in order to effectively achieve voltage stress clamping across the rectifier and current ripple elimination by using flying balance capacitor for the output filter design and finally improve the whole conversion efficiency and reduce the design complexity of the output filter.

关 键 词：容性二次侧整流电路 LLC谐振变流器 高变换效率 电压应力钳位 电流纹波抑制 

分 类 号：TM464[电气工程—电器]