摘要
提出了一种双CLT谐振软开关直流变换器。通过采用双变压器结构,变换器的电压增益曲线不仅具有两个谐振频率点,还具有一个独特的谐振零点,极大地拓宽了输出电压范围,使得输出电压在零至额定值范围内灵活可调。变换器可以在全负载范围内实现开关管零电压开通、二极管准零电流开通和零电流关断;在半载至额定负载范围内实现开关管准零电流关断,在轻载时限制关断损耗,变换器的关断损耗得到有效抑制。同时,在双CLT结构中,两个变压器的一次侧漏感可以作为谐振电感的一部分,削弱了漏感给电路带来的不利影响。最后,设计了一台1k W的样机,其最高效率可达95.3%,实验结果证明了理论分析的可靠性。
In this paper,a dual-CLT resonant soft-switching DC-DC converter is proposed.By the implementation of the dual-transformer structure,the voltage gain curve of the converter not only has two resonance frequency points,but also possesses a unique zero point,which extremely extends the output voltage range and ensures the output voltage adjustable within the range from zero to rated value.The converter guarantees the switches turn-on zero voltage switching(ZVS),and the diodes turn-on quasi zero current switching(Q-ZCS)and turn-off ZCS within full load range.From half load to rated load range,turn-off Q-ZCS characteristics for switches are achieved,while at light load,the turn-off losses diminish as well.Consequently,the switching losses are weakened efficiently.Besides,in the dual-CLT structure,the leakage inductors of the two transformers can be integrated into the resonant inductors,which relieves the side effects caused by leakage inductors.At last,a 1kW prototype is designed in this paper,and its maximum efficiency reaches 95.3%.The experiments also verify the reliability of the theoretical analysis.
作者
杨良
王议锋
陈博
郄伟
钟旭
张雅希
Yang Liang;Wang Yifeng;Chen Bo;Qie Wei;Zhong Xu(Key Laboratory of Smart Grid of Ministry of Education Tianjin University,Tianjin 300072,China;State Grid Tianjin Binhai Electric Power Supply Company,Tianjin 300000,China;Nari Solar Technology CO.LTD,Nanjing 211000,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第7期1461-1471,共11页
Transactions of China Electrotechnical Society
基金
国家高科技研究发展计划(863计划)(2015AA050603)和国网总部科技项目(SGTJDK00DWJS1500098)资助。
关键词
软开关
谐振
变压器
高效率
直流变换器
Soft switching
resonance
transformer
high efficiency
DC-DC converter
