一种基于UC3879的新型软开关DC/DC移相全桥变换器  

A Novel ZVZCS DC/DC Phase-shifted Full-bridge Converter Based on UC3879

作　　者：张友荣[1] 钱亮[2] 胡亮[2] 

机构地区：[1]空军雷达学院黄陂校区,湖北武汉430345 [2]空军雷达学院研管大队,湖北武汉430019

出　　处：《电气自动化》2011年第3期68-70,共3页Electrical Automation

摘　　要：传统的零电压零电流开关(ZVZCS)PWMDC/DC变换器存在滞后桥臂ZVS范围小、控制复杂、环流损耗大等问题.针对这些问题,介绍了一种新型的DC/DCPWM变换器,通过在滞后桥臂上并联一个辅助网络,来实现在较宽的负载范围内滞后桥臂零电压开通,重载下零电流开通。利用UC3879来实现瞬时值移相控制方式,给出了外围连接电路,并对相关参数进行了计算。用该方法设计了一台300WDC/DC电源模块,实验表明,可以在较宽的负载范围内实现滞后桥臂的零电压开通,重载下实现零电流开通,重载效率可以达到93%以上。Aiming at the conventional ZVZCS PWM DC/DC converter has disadvantages such as the narrow lagging leg zero-voltage-switch rang,complexity of control and big circulating current losses,the paper proposed a novel zero-voltage and zero-current switching （ZVZCS） phase-shifted full-bridge DC/DC converter using the auxiliary network.The converter could achieve the zero-voltage lagging leg switch in the wide load range and the zero-current switching in the heavy load.The paper gaves the peripheral circuit and calculation of interrelated parameters and a DC/DC converter of 300W.The experiment was given to verify the validity of the proposed theory and the efficiency of the heavy can achieve 93%.

关 键 词：全桥移相 零电压零电流开关 辅助网络 

分 类 号：TM464[电气工程—电器]