一种新型双变压器三电平DC/DC变换器的研究

Research on a New Three-level DC/DC Converter with Dual Transformer

提出了一种双变压器三电平变换器,通过在主桥臂并联一组辅助桥臂,再将辅助变压器的二次侧串联至主变压器的一次侧实现。该变换器不仅保留了传统三电平变换器的优点,同时通过辅助桥臂的通断从而实现宽范围输出电压;详细分析了双变压器三电平变换器的工作原理,分别比较了该变换器和传统变换器在不同输出范围下的效率。研制了一台1 500 W的原理样机,实验结果验证了理论分析的正确性以及该新型变换器的可行性。

This paper proposed a new interleaved three-level converter with dual transformers, which was realized by paralleling an auxiliary bridge arm to the main bridge arm and series connecting the secondary side of the auxiliary transformer series to the primary side of the main transformer.The advantages of traditional three-level converter were maintained, and wide range output voltage was obtained through the on/off of auxiliary arm. It analyzed the working principle of dual transformer three level converter, compared the efficiency of the converter and the traditional converter in different output range. Finally, a prototype of 1 500 W was built to verify the correctness of the theoretical analysis and the feasibility of the new converter.