一种高降压比DC-DC变换器  

A High Step-Down DC-DC Converter

作　　者：刘昌咏 赵晋斌 毛玲 周鸣倢 李雨桐 Liu Changyong;Zhao Jinbin;Mao Ling;Zhou Mingjie;Li Yutong(School of Electrical Engineering Shanghai University of Electric,Shanghai,200090,China;Shenzhen Institute of Building Research Co.Ltd,Shenzhen,518000,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]深圳市建筑科学研究院股份有限公司,深圳518000

出　　处：《电工技术学报》2019年第20期4264-4271,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777120);中美清洁能源联合研究中心建筑节能合作项目“夏热冬暖地区净零能耗建筑关键技术综合性工程示范”(2016YFE0102300)资助

摘　　要：传统双管正激变换器受变压器电压比和开关最小占空比限制,无法适用高降压比场合。针对此问题,该文在此基础上提出一种非隔离新型高降压比DC-DC变换器。该变换器去掉变压器,用一个起能量反馈作用的电感替换整流二极管,在适当的占空比和不使用变压器的情况下,能够实现高降压比。该文分析了变换器的降压原理,梳理变换器在滤波电感电流连续模式下的四种工作状态,推导变换器输出增益的计算公式,给出电流连续模式的限制条件,并与其他变换器进行了性能对比分析。最后,搭建一台实验样机,实现了高达50多倍的降压比,证明了理论分析的正确性。The traditional dual-switch forward converter is limited by the transformer ratio and the minimum duty cycle of the switch,which is impossible to apply on high step-down ratio situation.This paper proposes a non-isolated new high step-down ratio DC-DC converter on the basis of the above.The DC-DC converter removes the transformer and substitutes the rectifier diode for an inductor that acts as an energy feedback to achieve a high step-down ratio with the appropriate duty cycle.This paper analyzed the voltage reduction principle of the converter,concluded four operating states of the converter in the continuous mode of the filter inductor current,deduced the calculation formula of the output gain of the converter,and provided the limiting conditions of the current continuous mode.Compared with other two kinds of step-down circuits,the DC-DC converter showed its advantages.Finally,an experimental prototype was built to achieve a step-down ratio up to 50 times,which proved the correctness of theoretical analysis.

关 键 词：高降压比 DC-DC 双管正激 非隔离 

分 类 号：TM464[电气工程—电器]