Mode shift and stability control of a current mode controlled buck-boost converter operating in discontinuous conduction mode with ramp compensation  

作　　者：包伯成 许建平 刘中 

机构地区：[1]Department of Electronic Engineering,Nanjing University of Science and Technology [2]School of Electrical and Information Engineering,Jiangsu Teachers University of Technology [3]School of Electrical Engineering,Southwest Jiaotong University

出　　处：《Chinese Physics B》2009年第11期4742-4747,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundations of China (Grant Nos 50677056 and 60472059)

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 diagrazn, 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.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 diagrazn, 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.

关 键 词：buck-boost converter iterative map model mode shift ramp compensation 

分 类 号：TM46[电气工程—电器] O415[理学—理论物理]