中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4742-4747.doi: 10.1088/1674-1056/18/11/023
刘中1, 包伯成2, 许建平3
Bao Bo-Cheng(包伯成)a)b)†,Xu Jian-Ping(许建平)c), and Liu Zhong(刘中) a)
摘要: By establishing the discrete iterative mapping model of a current mode controlled buck-boost converter, this paper studies the mechanism of mode shift and stability control of the buck-boost converter operating in discontinuous conduction mode with a ramp compensation current. With the bifurcation diagram, Lyapunov exponent spectrum, time-domain waveform and parameter space map, the performance of the buck-boost converter circuit utilizing a compensating ramp current has been analysed. The obtained results indicate that the system trajectory is weakly chaotic and strongly intermittent under discontinuous conduction mode. By using ramp compensation, the buck-boost converter can shift from discontinuous conduction mode to continuous conduction mode, and effectively operates in the stable period-one region.
中图分类号: (Control of chaos, applications of chaos)