摘要
在一定占空比下,研究一种具有更大降压比和低开关电压应力的新型DC-DC变换器。该变换器由低侧开关型降压单元和开关电感型降压单元级联而成。其中,低侧开关型降压单元在拓扑上等同于主控开关位于低侧的Buck电路;开关电感型降压单元则由两个二极管与两个电感以X型方式连接而成。用两套低侧开关型降压单元相互堆叠以及配置两个主控开关的方式来大幅降低开关器件的电压应力。在对该变换器的工作模态与稳态特性进行分析的基础上,使用SIMPLIS对理论分析进行仿真验证。调试了一台功率为500 W的硬件样机,试验结果表明该变换器具备降压比大、开关器件电压应力低、输入电流连续的特点。
At certain duty cycle,a novel DC-DC converter with larger step-down ratio and low voltage stress of switching devices is studied.The proposed converter consists of a low-side switch type step-down unit cascading with switched inductor step-down unit.Topologically,the low-side switch type step-down unit is equivalent to Buck converter with main switch located on low side.As for the switched inductor step-down unit,it is organized as X-shape connection by two diodes and two inductors.Thanks to stacking two sets of low-side switch type units and configuring two main control switches in the circuit,voltage stress of switching devices are dramatically reduced.Based on the analysis of operation modes and steady-state performance of the converter,SIMPLIS is used to do simulation in order to verify theoretical analysis.A 500 W hardware prototype with 94.1%peak efficiency is built and tested with results demonstrating that the proposed buck converter features large step-down ratio,low voltage stress of switching devices,continuous input current.
作者
万文轩
刘纲
尹力
傅萌
WAN Wenxuan;LIU Gang;YIN Li;FU Meng(Wuhan Power Supply Company of State Grid Hubei Power Company,Wuhan 430000;School of Electrical Engineering,Southeast University,Nanjing 210096)
出处
《电气工程学报》
CSCD
2021年第3期33-39,共7页
Journal of Electrical Engineering
基金
国家重点研发计划资助项目(2020YFF0426410)。
