一种新型零电压零电流PWMDC/DC全桥变换器的研制  

Development of a novel zero-voltage and zero-current switching PWM DC/DC full-bridge converters

作　　者：刘星桥[1] 谭俐[1] 凌俊杰[1] 张继来[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2006年第4期347-350,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省高校自然科学基金资助项目(05KDJ470048)

摘　　要：利用耦合输出电感进行次级箝位移相控制;采用了无损耗元件及有源开关的简单辅助电路;副边整流二极管的电压应力和传统的硬开关电路一样小;轻载时箝位电容的充、放电电流能根据负载情况自动调整,可保证在很宽的负载范围内变换器都有高效率;辅助回路二极管Dc可以实现软关断,因而反向恢复影响小;本变换器不存在原边环流,因而可以提高变换效率.文中分析了该新型拓扑的工作原理,提出了参数设计依据,进而推导了变换器各种状态时的参数计算方程;采用此方案成功研制了48 V/20 A软开关电源,进行了参数设计,并给出了其仿真和试验结果.试验结果表明该变换器在1/3负载以上时效率可以高达92%以上.A novel phase-shifted control ZVZCS converter is proposed which uses a coupled output inductor. Compared with the previously proposed topologies, a simple auxiliary circuit is used which consists of neither lossy components nor active switchings. The voltage stress of the secondary rectifier diode is kept as small as that of hard-switching converter. The current to charge clamping capacitance is self-adjusted in accordance with the load at light condition, which guarantees high efficiency over wide load range. Diode Dc of auxiliary circuit is softly commutated and it＇s reverse recovery is minimized. The principle of operation, topology, features and parameter-design of the novel converter is analyzed. A 48V/20A softswitching converter is developed. The experimental results show that the efficiency of this converter may reach as high as 92% when it is in 1/3 load.

关 键 词：全桥变换器 软开关 零电压-零电流开关 脉宽调制 移相控制 

分 类 号：TM91[电气工程—电力电子与电力传动] TN86[电子电信—信息与通信工程]