摘要
传统移相全桥变换器广泛应用于中、大功率DC-DC变换场合,但掉电保持要求限制了它在正常工作时的占空比,增加了一次侧环流损耗。针对该问题,提出一种减小环流损耗的新型软开关全桥变换器。通过在一次侧引入辅助耦合电感和辅助电容,二次侧引入辅助绕组和辅助开关管,该变换器不仅一次侧环流损耗得到大大的降低,而且一次侧开关管在全负载范围内也能够实现零电压开关(ZVS),进一步提高了变换器的变换效率。文中阐述了该变换器的工作原理和特性分析,并通过一台120W/24V、开关频率为100k Hz的原理样机验证了该变换器的优点。
A new high-efficient phase-shifted full-bridge （PSFB） converter is proposed in this paper. The conventional phase-shift full-bridge converter gains more attentions in medium or high power applications, because of its features high conversion efficiency and high power density. However, the hold-up-time requirement limits its operating duty ratio in normal state, and the conduction loss increases caused by circulating current. Therefore, by introducing the auxiliary coupled inductor and the storage capacitor at primary side, as well as the auxiliary winding and the auxiliary switching at secondary side, the proposed converter can not only achieve the ZVS operation in the full load range but also reduce the conduction loss. Finally, the operational principle and analysis of the proposed converter are presented and verified by the 120W/24V, 100kHz prototype.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第22期71-79,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51377078)
台达环境与教育基金会<电力电子科教发展计划>(DREG2012002)
江苏省"六大人才高峰"(2014-JNHB024)资助项目
关键词
零电压开关
全桥变换器
环流损耗
掉电保持时间
Zero voltage switching, full bridge converter, circulation loss, hold up time
