Mode shift and stability control of a current mode controlled buck-boost converter operating in discontinuous conduction mode with ramp compensation |
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| Authors: | Bao Bo-Cheng Xu Jian-Ping Liu Zhong |
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| Affiliation: | 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; School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | ![]()
By establishing the discrete iterative mapping model of acurrent mode controlled buck-boost converter, this paper studies themechanism of mode shift and stability control of the buck-boostconverter operating in discontinuous conduction mode with a rampcompensation current. With the bifurcation diagram, Lyapunovexponent spectrum, time-domain waveform and parameter space map, theperformance of the buck-boost converter circuit utilizing acompensating ramp current has been analysed. The obtained resultsindicate that the system trajectory is weakly chaotic and stronglyintermittent under discontinuous conduction mode. By using rampcompensation, the buck-boost converter can shift from discontinuousconduction mode to continuous conduction mode, and effectivelyoperates in the stable period-one region. |
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| Keywords: | buck-boost converter iterative map model mode shift ramp compensation |
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