基于载波移相控制的高功率密度双降压式全桥逆变器  

A High Power Density Dual-Buck Full-Bridge Inverter Based on Carrier Phase-Shifted Control

作　　者：谢江华[1] 张方华[1] 张帅[1] 陈菲[1] 雷鸣[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)南京210016

出　　处：《电工技术学报》2016年第13期1-9,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51007039)

摘　　要：双降压式全桥逆变器(DBFBI)因不存在桥臂直通、直流利用率高而且可实现续流二极管的最优选取,所以具有可靠性高和变换效率高方面的优势。但是,DBFBI具有四个滤波电感,体积重量较大,限制了其在高功率密度场合的应用。将载波移相SPWM(CPS-SPWM)的控制方法应用到DBFBI中,该控制方式下,输出滤波电感等效工作频率是开关频率的两倍,有效地减小了滤波电感的体积和重量。此外,在电感电流半个周期内高频状态时只有两个开关管工作,有效地降低了逆变器的开关损耗。详细地分析了该控制方式下环流产生的原因,通过从原有的4个滤波电感中分离出一个共用的滤波电感(CFI),有效地减小了环流损耗,并且给出了滤波电感的具体的设计过程。最后将剩余的四个滤波电感两两耦合,进一步提高了磁心的利用率。实验结果验证了理论分析的正确性。The dual buck fu ll-b rid g e inverter （D B F B I） has great advantages in re lia b ility and efficiency becauseof no shoot-through concerns, high u tilizatio n rate of DC input voltage, and optim al choice of its free-w heelingdiodes. H ow ever, the four filte r inductors make the inverter large and heavy, w hich lim its its applications inhigh power density conditions. The carrier phase-shifted sinusoidal pulse w idth m odulation （C P S -S P W M ） controlis applied to D BFBIs in this paper. W ith the CPS-SPWM co n tro l, the equivalent operating frequency of the outputfilte r inductors is twice of the sw itching frequency, w hich effectively reduces the size and weight of the filte r in ductor.In a d d itio n , only two switches work in the high-frequency sw itching state during the h a lf lin e cycle of thefilte r-in d u c to r current, w hich can effectively reduce the inverter switching losses. The circulating current in tro ducedby this control is analyzed in detail. By separating a common filte r inductor （ C F I） from the four prim ary in ductors, the circulating current losses can be effectively reduced. The design guidelines of the filte r inductors areprovided. F in a lly , the rem aining four filte r inductors are realized by two coupled inductors in order to further u tilizethe magnetic core. Experim ental results verify the theoretical analysis.

关 键 词：双降压式全桥逆变器 载波移相SPWM 环流 滤波电感 耦合电感 

分 类 号：TM464[电气工程—电器]