耦合电感式无源无损缓冲电路的优化设计  

Optimal Design of Passive Lossless Snubbers With Coupled-inductor

作　　者：伍健[1] 何礼高[1] 何伟军[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏省南京市210016

出　　处：《中国电机工程学报》2010年第24期61-68,共8页Proceedings of the CSEE

摘　　要：耦合电感式无源无损缓冲电路利用耦合电感的漏感与缓冲电容,在功率管开关过程中进行谐振,实现功率管的零电流开通和零电压关断。为了尽量减小开关损耗,并保证可实现软开关的较宽占空比范围,根据功率管的损耗模型并结合缓冲电路实现软开关的条件,提出一种基于该缓冲电路谐振元件参数的优化设计方法。采用该方法设计的耦合电感式无源无损缓冲电路不受最小电压应力无源无损缓冲电路中谐振元件参数的限制,拓宽了软开关的占空比范围,提高了效率。通过一台240W的带有该缓冲电路的Buck变换器原理样机,验证了理论分析和设计的正确性。The zero current switching （ZCS） turn-on and zero voltage switching （ZVS） turn-off of the power switch can be realized from resonance between the leakage inductance of coupled-inductor and snubber capacitor in the passive lossless snubber with coupled-inductor while the switch is switching.For the purpose of minimizing switching losses while maintaining soft switching over a larger duty ratio range,an optimal design procedure of the snubber resonant elements was proposed according to the loss model of the power switch and the requirements for soft switching of the snubber.The passive lossless snubber with coupled-inductor designed on the base of the proposed methodology eliminated the limitation of resonant elements value in the minimum voltage stress （MVS） passive lossless snubber,the duty ratio range for soft switching is extended,and the efficiency was improved.A 240 W Buck converter prototype based on the passive lossless snubber with coupled-inductor was built to verify the theoretical analysis and design methodology.

关 键 词：软开关 缓冲电路 耦合电感 无源无损 优化设计 

分 类 号：TM46[电气工程—电器]