推挽正激电容箝位零电压同步整流变流器研究  

Research on the Push-pull Forward Capacitor Clamp Zero-voltage Synchronous Rectifier Converter

作　　者：刘国旺 张宇驰[3] 王琳 LIU Guowang;ZHANG Yuchi;WANG Lin(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China;College of Electrical and Information Engineering,Hunan University,Changsha,Hunan 410082,China;College of Electrical Engineering,Hunan Polytechnic College,Changsha,Hunan 410000,China;Hunan Institute of Metrology,Changsha,Hunan 410000,China)

机构地区：[1]中车株洲电力机车研究所有限公司,湖南株洲412001 [2]湖南大学电气与信息工程学院,湖南长沙410082 [3]湖南工业职业技术学院电气工程学院,湖南长沙410000 [4]湖南省计量研究院,湖南长沙410000

出　　处：《控制与信息技术》2023年第1期57-64,共8页CONTROL AND INFORMATION TECHNOLOGY

基　　金：国家自然科学基金(61271382)。

摘　　要：为进一步提高推挽变流器的效率,在传统的推挽电路一次侧高压侧中心抽头之间串联一个箝位电容器,实现漏感能量无损伤吸收并回馈到输入侧,并建立一次侧两个绕组之间的耦合关系,使一次侧两个绕组同时向二次侧传递能量,以降低一次侧吸收电路的损耗;同时,二次侧输出侧利用同步整流MOS管的双向导通特性,在输出端用同步整流MOS管代替整流二极管,降低整流电路的功率损耗,并针对弱电控制部分提出一种双闭环控制策略。最后,文章基于建模分析与仿真搭建一台240 W的工程样机,对控制环路及主功率器件的关键波形进行分析。分析结果表明,相对传统的推挽变流器,该电路拓扑可以有效减少桥臂开关损耗、降低二次侧整流电路的功率损耗,变流器的整体效率提高3%左右。In order to improve the efficiency of the push-pull converter, a clamp capacitor is connected in series between the center tap of the high voltage side of the primary side of the traditional push-pull circuit, so that the leakage energy can be absorbed without damage and returned to the input side. The coupling relationship between the two windings of the primary side is established to make the two windings of the primary side transfer energy to the secondary side at the same time, so as to reduce the loss of the absorption circuit of the primary side. At the same time, the synchronous rectifier diode is replaced by the synchronous rectifier tube at the output side by the double guiding pass characteristic of synchronous rectifier MOS tube at the output side, so as to reduce the power loss of the rectifier circuit. A double closed-loop control strategy is proposed for the weak current control part. Finally, a 240 W engineering prototype is built based on modeling analysis and simulation, and the key waveform of the control loop and main power devices are analyzed. The analysis results show that compared with the traditional push-pull converter, the circuit topology can effectively reduce the switching loss of the bridge arm and the power loss of the secondary side rectifier circuit, and the overall efficiency of the converter is improved by about 3%.

关 键 词：推挽变流器 正激变流器 箝位电容器 同步整流器 漏感能量吸收 

分 类 号：TM464[电气工程—电器]