零电压开关PWM变压整流器

讨论了ＰＷＭ式变压整流器和谐振式变压整流器的优缺点，在此基础上，提出了一种零电压开关ＰＷＭ变压整流器。它是ＰＷＭ技术和零电压开关准谐振技术相结合的产物，其特点是功率开关器件的开关转换过程中采用零电压开关准谐振技术，即功率开关器件工作于零电压开关状态──软开关状态下，而能量传输的主要形式采用ＰＷＭ技术，故具有ＰＷＭ式变压整流器和谐振式变压整流器的优点。文中介绍了该变压整流器的电路结构及工作原理，着重分析了其关键部分──全桥零电压开关ＰＷＭＤＣ－ＤＣ变换器的工作过程和设计方法。该变压整流器具有体积小、重量轻、效率高、性能好、输出电压稳定度高的优点。

Zero-Voltage-Switched PWM Transfer Voltage Rectifier

With the respective characteristics of PWM transfer voltage rectifier and resonanttransfer voltage rectifier, this paper presents a zero-voltage-switched (ZVS) PWM transfervoltage rectifier which is a hybird of the two kinds of rectifiers and inherits most of their advantages. Techniques called zreo-voltage-switched quasi-resonant are adapted to make powerswitches operated under zero - voltage-switched (soft - switohed) during power switching period.During the working period, PWM techniques are adapted to control its main power transportion. The paper introduces its circuit topology and its principle briefly,and then facuses onthe analysis and design of its key part, the Full--Bridge (FB) zero-voltage-switched (ZVS)PWM DC-DC converter. It is shown through experiments that the rectifier has many advantages,such as little size,light in weight,high in efficiency and stable in output voltage.