耦合电感式开关准Z源双向直流变换器

Switched Quasi-Z-source Bi-directional DC-DC Converter with Coupled-inductor

针对电动汽车的多源系统应用背景,本文提出一种应用于超级电容的耦合电感式开关准Z源双向直流变换器。在传统的开关准Z源拓扑基础上,通过将开关准Z源网络中的电感进行耦合,从而减小所需的总电感量与磁芯体积,进一步提高变换器的功率密度。本文对电感耦合后的开关准Z源变换器进行了运行原理及稳态分析,对所提电感耦合方案进行了理论分析与参数设计,并与分离式电感进行了比较,最后通过样机实验验证了理论分析的正确性。

Aimed at the application background of multi-source systems in electric vehicles,a switched-quasi-Z-source bi-directional DC-DC converter with coupled-inductor for supercapacitors is proposed in this paper.On the basis of the traditional switched-quasi-Z-source topology,by coupling the inductors in the switched-quasi-Z-source network,the required total inductance and magnetic core volume are reduced,thereby improving the power density of the converter further.The operating principle and steady-state characteristics of the converter after the coupling with the inductors are analyzed,the theoretical analysis and parameter design of the proposed inductor coupling scheme are performed,and the comparison with the conventional separated inductors is carried out.Finally,a prototype was built,and experimental results verified the theoretical analysis.