一种新型三电平直流变换器的仿真研究

Research on Simulation of a New Three-Level DC-DC Converter

文章提出了一种新型的隔离式三电平直流变换器的拓扑,它是在传统的两电平变换器的基础上提出来的。在这种新型拓扑中,每个开关管的电压应力都比两电平时降低了一半,并且滤波器的体积也明显减小,使其更适用于高电压大功率场合,且拓扑极具对称性,这样方便了工作原理的分析及控制电路的设计。文章以SEPIC三电平直流变换器为例,分析了该变换器的工作原理,给出了控制策略。通过仿真结果,验证了工作原理和控制策略的正确性,比如电压应力低等特点。

This paper proposes a new isolated Three-Level DC-DC converter.The isolated SEPIC TL DC-DC converter is based on the conventional SEPIC converter.In this new converter the voltage stress of the switch is reduced to a half and the filter inductor is also significantly reduced.Its operation principle and control strategies of the converter are investigated.By modeling and simulation,the performances of the DC-DC converter and control strategies have been verified,such as low switch voltage stress and so on.