双变压器串联型有源箝位三管反激变换器  

A Three-trainsistor Flyback Converter with the Function of Active Clamp and Dual-transformer Series

作　　者：李琼[1] 庹朝永[1] 丁立国[2] 涂睿[2] 

机构地区：[1]湖南机电职业技术学院电气工程学院,长沙410151 [2]湖南大学电气与信息工程学院,长沙410100

出　　处：《控制工程》2016年第11期1740-1746,共7页Control Engineering of China

基　　金：国家高技术研究发展计划资助项目(2014AA110501)

摘　　要：针对传统的双管变换器主开关管电压应力大、变压器磁通不平衡、开关损耗大等问题,研究了一种双变压器串联型有源箝位三管反激变换器。该变换器采用双变压器串联结构,不会出现变压器磁通不平衡的问题,主开关管上承受的电压应力仅为输入电压;为减少开关损耗,通过增加一个辅助开关管和谐振电容串联构成的有源箝位电路使得变换器两个主开关均工作在零电压开关(Zero-voltage switching,ZVS)状态,使得效率提高。先是介绍了新型反激变换器的工作原理,接着重点分析了变换器的各个工作模态并给出了变换器关键参数的设计步骤,最后通过一个实例进行了实验分析。The traditional double-barreled converter has some problems such as main switches sustaining large voltage stress and transformer flux imbalance and large switching losses. So, we studies a three-transistor flyback converter with the function of active clamp and dual-transformer series. Because this convertor is made up of two series of flyback converters, the transformer flux-imbalance problem does not occur. Its two main switching elements sustain small voltage stress and work in a state of zero-voltage-switching by adding an auxiliary switch tube to reduce switching losses and improve its efficiency. The article introduces the working principles of the new type of the flyback converter and analyses every operating modal in detail. Moreover, it also provides the design procedures of the key parameters of the converter particularly. Finally, an experimental analysis is carried out by an example.

关 键 词：三管反激变换器 零电压开关 辅助开关管 有源箝位 

分 类 号：TM315[电气工程—电机]