输出本安Buck-Boost变换器的最危险输出短路放电工况研究  

Research on the Most Dangerous Output Short-circuit Discharge Conditions of Output Intrinsic Safety Buck-Boost Converters

作　　者：刘树林[1] 马一博[1] 文晓明[1] 祁俐俐 赵永秀[1] 

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《电工技术学报》2015年第14期253-260,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(50977077;51277149)

摘　　要：为得出Buck-Boost变换器最危险的输出短路放电工况,依据其输出短路火花放电曲线,深入研究了负载电阻、输入电压等参数对输出短路放电能量的影响。考虑到实际的参数取值范围,指出当负载电阻RL小于给定电感L对应的临界电阻RLC时,输出短路火花放电能量是关于RL的凹函数,且随输入电压的减小而增大;当RL>RLC时,放电能量与输入电压无关,但随RL的增加而增大。并得出Buck-Boost变换器存在一特征电感LT,当L>LT时,其最危险工况为:负载电阻和输入电压最小;而在L<LT时,其最危险工况为:负载电阻最大。仿真和实验结果验证了理论分析及所得出最危险工况的正确性。To obtain the most dangerous discharge conditions of Buck-Boost converters, the influences of the input voltage Vi and load resistance RL on the Output Short-circuit Spark Discharging（OSSD） energy are deeply researched based on the OSSD curve of Buck-Boost converter in this paper. Considering the actual parameter range, It is indicated that the OSSD Energy（OSSDE） of the Buck-Boost converter is a concave function about RL, but that increases with the decrease of Viwhen RL is less than the critical resistance RLC corresponding to the given inductance L, while that increases with the increase of RL, but it is independent of Vi in the case of RL〉RLC. Moreover, the characteristic inductance LT in Buck-Boost converters is deduced, and it is found that the corresponding Most Dangerous Conditions（MDC） are that both Vi and RL are the minimum in the case of L〉LT, while, the corresponding MDC is that RL is the maximum when L〈LT. The theoretical analysis and proposed MDC are verified by the simulation and experiment results.

关 键 词：BUCK-BOOST变换器 输出本质安全 短路火花放电能量 最危险工况 

分 类 号：TM464[电气工程—电器]