一种用耦合电感实现零电压零电流开关的移相全桥变换器  

A Novel ZVZCS Phase-Shifted Full-Bridge Converter with Coupled Inductor

作　　者：张强[1] 林维明[1] 徐玉珍[1] 

机构地区：[1]福州大学电气工程与自动化学院,福州350108

出　　处：《电工技术学报》2016年第21期142-149,共8页Transactions of China Electrotechnical Society

基　　金：福建省科技厅重大项目(2014H6012);福建省自然科学基金项目(2015J01193);福州大学博士启动基金项目(510069)资助

摘　　要：在高压大功率场合,通常用IGBT作为开关器件。由于其关断的电流拖尾现象,IGBT零电流关断能有效减小开关损耗。提出一种新型移相全桥零电压零电流开关(ZVZCS)方案,通过1个双绕组的耦合电感和2个二极管实现滞后臂开关管在宽负载范围的零电流关断(ZCS)。所增加的二极管可以实现软开关,耦合电感的漏感并不会对增加的二极管产生附加的电压应力。为减小耦合电感的励磁电流对ZCS的影响,通过在所增加的2个二极管上各并联一个小电容,在不增大耦合电感尺寸的条件下增加复位电压的作用时间,保证滞后臂开关管的ZCS。在理论分析的基础上进行了计算机仿真,并设计了一台开关频率为68 k Hz、输出为100 V/10 A的样机进行实验验证。仿真和实验结果证明了所提方案的有效性。In high voltage and large power applications,IGBTs are often chosen as power switches. Due to their tail currents,zero current turning-off can reduce switching loss effectively. A two-winding coupled inductor and two diodes are introduced to realize zero-voltage and zero-current switching（ ZCS） for phase-shifted fullbridge converter. ZCS of the lagging-leg switches is achieved in wide load range. The added diodes are turned on and off with soft switching. The leakage inductor of the coupled inductor will not increase voltage stress of the added diodes. To reduce the impact of magnetizing current of the coupled inductor on ZCS,two small capacitors are paralleled with two diodes,respectively. Without increasing the size of the coupled inductor,the interval of the reset voltage is increased so that the lagging-leg switches can be turned off with ZCS in practice. The analysis is verified by simulation and experimental results on a 68 k Hz,100 V /10 A prototype. The results of simulation and experiment verify the validity of the proposed scheme.

关 键 词：零电压零电流开关 移相全桥变换器 耦合电感 宽负载范围 

分 类 号：TM46[电气工程—电器]