摘要
提出了隔离型DC/DC变换器的ZCT实现方案。在变压器副边构造了和主功率回路并联的辅助谐振网络,在主开关管关断以前开通主开关管,通过谐振电容的高电压封锁副边整流桥的输出,使变压器原边电流降到零,在全负载范围内实现了主管和辅管的零电流开关。该文以推挽正激变换器为例,进行了详细的理论分析和关键参数的设计,通过原理样机的研制证明了这种方案的优点。最后给出了应用此种思想实现ZCT的一族变换器拓扑。
A novel Zero-Current-Transition (ZCT) scheme is proposed . The auxiliary cell is in parallel with the main circuit and the Zero-Current-Switching range of the main and the auxiliary switches of the proposed converter are entirely achieved by operating the auxiliary cell. The resonant capacitor achieves high voltage by operating the auxiliary cell. The auxiliary switch turns on before the main switches turn off, the high voltage of resonant capacitor blanks off the rectifier, and then the currents of the secondary windings and the primary windings reach zero. The operation principle of the ZCT technique is detailed with the push-pull forward converter as an example. The feasibility of the approach is verifide by the results of experiments. A family of the ZCT circuits in isolated converters using the same scheme are given.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第9期63-66,共4页
Proceedings of the CSEE
