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Symmetrical dynamics of peak current-mode and valley current-mode controlled switching dc-dc converters with ramp compensation

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Chinese Physics B 2010年第6期19卷 122-129页

作者：周国华许建平包伯成金艳艳 School of Electrical Engineering Southwest Jiaotong University School of Electrical and Information Engineering Jiangsu Teachers University of Technology

The discrete iterative map models of peak current-mode （PCM） and valley current-mode （VCM） controlled buck converters, boost converters, and buck-boost converters with ramp compensation are established and their dynamical behaviours are investigated by using the operation region, parameter space map, bifurcation diagram, and Lyapunov exponent spectrum. The research results indicate that ramp compensation extends the stable operation range of the PCM controlled switching dc-dc converter to D 〉 0.5 and that of the VCM controlled switching dc-dc converter to D 〈 0.5. Compared with PCM controlled switching dc-dc converters with ramp compensation, VCM controlled switching dc-dc converters with ramp compensation exhibit interesting symmetrical dynamics. Experimental results are given to verify the analysis results in this paper.

关键词： discrete iterative map model dynamics switching converters ramp compensation

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Dynamics and stabilization of peak current-mode controlled buck converter with constant current load

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Chinese Physics B 2015年第10期24卷 101-109页

作者：冷敏瑞周国华张凯暾李振华 School of Electrical Engineering Southwest Jiaotong University

The discrete iterative map model of peak current-mode controlled buck converter with constant current load（CCL）,containing the output voltage feedback and ramp compensation, is established in this paper. Based on this model the complex dynamics of this converter is investigated by analyzing bifurcation diagrams and the Lyapunov exponent spectrum. The effects of ramp compensation and output voltage feedback on the stability of the converter are investigated. Experimental results verify the simulation and theoretical analysis. The stability boundary and chaos boundary are obtained under the theoretical conditions of period-doubling bifurcation and border collision. It is found that there are four operation regions in the peak current-mode controlled buck converter with CCL due to period-doubling bifurcation and border-collision bifurcation. Research results indicate that ramp compensation can extend the stable operation range and transfer the operating mode, and output voltage feedback can eventually eliminate the coexisting fast-slow scale instability.

关键词： buck converter constant current load discrete iterative map model ramp compensation

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