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SYMMETRICAL DYNAMICS OF CURRENT-MODE CONTROLLED SWITCHING DC-DC CONVERTERS

GUOHUA ZHOU

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China

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JIANPING XU

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China

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BOCHENG BAO

School of Information Science and Engineering, Changzhou University, Changzhou 213164, P. R. China

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https://doi.org/10.1142/S0218127412500083Cited by:20 (Source: Crossref)

Abstract

Peak Current-Mode (PCM) and Valley Current-Mode (VCM) controlled switching dc-dc converters have symmetrical dynamical behaviors within a wide circuit parameter variation range. To investigate the symmetrical dynamical behaviors between PCM and VCM controlled switching dc-dc converters, the iterative map models and inductor current borderlines that exist in the bifurcation diagrams of both PCM and VCM controlled buck, boost, and buck-boost converters are established. The research results of bifurcation behaviors indicate that the bifurcation diagrams of PCM and VCM controlled switching dc-dc converters have symmetrical dynamical behaviors corresponding to a symmetrical point (SP). The simulation results show that time-domain waveforms of PCM and VCM controlled switching dc-dc converters working in periodic orbits have symmetrical axis and SP, and the SP also exists in corresponding phase portraits. Experimental results are given to verify the analysis and simulation results in this paper.

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