Mode shift and stability control of a current mode controlled buck-boost converter operating in discontinuous conduction mode with ramp compensation
Bao Bo-Cheng(包伯成)a)b)†,Xu Jian-Ping(许建平)c), and Liu Zhong(刘中) a)
a Department of Electronic Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; b School of Electrical and Information Engineering, Jiangsu Teachers University of Technology, Changzhou 213001, China; c School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract 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.
Received: 05 October 2008
Revised: 23 March 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundations of China (Grant Nos 50677056 and
60472059).
Cite this article:
Bao Bo-Cheng(包伯成),Xu Jian-Ping(许建平), and Liu Zhong(刘中) Mode shift and stability control of a current mode controlled buck-boost converter operating in discontinuous conduction mode with ramp compensation 2009 Chin. Phys. B 18 4742
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