摘要
提出了一种可在零电流开关ZCS(zero-current switch)下仅通过功率开关器件达到直流隔离效果且输出电压在一定范围可调的直流变换器拓扑结构。首先分析了该变换器稳态时的工作原理及电路模型,并推导出了在含有寄生参数下的输出电压数学表达式;然后通过接触电流TC(touch current)对电路的隔离性能进行了评估,并论述了共模漏电流的抑制方案以提升电路隔离效果;最后基于宽禁带WBG(wide bandgap)材料碳化硅MOSFET下设计了原理性实验样机,并对理论分析进行了验证。
A DC converter topology is proposed in this paper,which can realize DC isolation effect only with switch devices under zero-current switch(ZCS) and keep the output voltage adjustable in a certain range.The working principle and circuit model are analyzed under the steady-state conditions of the converter,and mathematical expressions of output voltage containing parasitic parameters are deduced.The isolation performance of the circuit is evaluated by touch current(TC),and the suppression scheme for common-mode current is discussed to promote the isolation effect.At last,an experimental prototype with wide bandgap(WBG) SiC MOSFET was designed,and the theoretical analysis was verified.
作者
李翔宇
杨克虎
LI Xiangyu;YANG Kehu(School of Mechanical Electronic & Information Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China)
出处
《电源学报》
CSCD
北大核心
2019年第1期21-28,共8页
Journal of Power Supply
关键词
直流隔离变换器
零电流
宽禁带半导体
接触电流
DC isolation converter
zero current
wide bandgap(WBG) semiconductor
touch current
