DU Jian hua1, JI Jing2, WANG Jun2, MA Hao2

 

(1. Beijing Institute of Control Engineering , Beijing, 100190, China;

 

(2. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

 

Abstract: In order to guarantee cascaded stability of distributed power supply system, the small signal model with parasitic parameters of Buck circuit, Boost circuit and Buck Boost circuit were summarized. The influence of the parasitic parameters on the stability of the single system was analyzed. On the basis of Middlebrook stability criterion, the effects of parasitic parameters on the input impedance and output impedance were studied to proposed the effect of parasitic parameters in the cascade system. The results show that appropriate parasitic parameters have positive effect on the stability of the single stage system and the stability of the cascaded system. The characteristics of actual circuits are better than those of the ideal conditions. This research has some guidance for the design of the stability of the practical cascaded system.

 

Key words: parasitic parameter; small signal model; single stage stability; cascade stability