中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4742-4747.doi: 10.1088/1674-1056/18/11/023

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

刘中1, 包伯成2, 许建平3   

  1. (1)Department of Electronic Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (2)Department of Electronic Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;School of Electrical and Information Engineering, Jiangsu Teachers University of Technology, Changzhou 213001, China; (3)School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • 收稿日期:2008-10-05 修回日期:2009-03-23 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundations of China (Grant Nos 50677056 and 60472059).

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)   

  1. 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
  • Received:2008-10-05 Revised:2009-03-23 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundations of China (Grant Nos 50677056 and 60472059).

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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.

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.

Key words: buck-boost converter, iterative map model, mode shift, ramp compensation

中图分类号:  (Control of chaos, applications of chaos)

  • 05.45.Gg
05.45.Pq (Numerical simulations of chaotic systems) 02.60.-x (Numerical approximation and analysis)