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ZHOU Qun,YOU Zhikun,LIU Xueshan,LIU Chenqiong,XU Yi.Study on the Stability of I2 Controlled Buck Converter[J].JOURNAL OF POWER SUPPLY,2019,17(2):40-49
Study on the Stability of I2 Controlled Buck Converter
Received:June 21, 2017  Revised:August 21, 2018
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DOI:10.13234/j.issn.2095-2805.2019.2.40
Keywords:I2 control  sensing resistance  second-order modelling  switching converter
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ZHOU Qun School of Electrical Engineering and Information, Sichuan University, Chengdu , China
YOU Zhikun School of Electrical Engineering and Information, Sichuan University, Chengdu , China youistheonly@163.com
LIU Xueshan School of Electrical Engineering and Information, Sichuan University, Chengdu , China
LIU Chenqiong School of Electrical Engineering and Information, Sichuan University, Chengdu , China
XU Yi State Grid Xinjiang Electric Power Company, Urumqi , China
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Abstract:
      In this paper, the improvement effect of the sensing resistance of inductance current in a current-mode controlled switching converter is investigated. An I2 controlled Buck converter is taken as an example, and the second-order discrete iterative map model including the output capacitance equivalent series resistance(ESR) is established. On this basis, by analyzing the bifurcation diagrams, trajectories of eigenvalues, maximum Lyapunov exponent, and stable boundary with the variation of output capacitance time constant and the sensing resistance of inductance current, the effect of the sensing resistance of inductance current on the dynamic characteristics of the converter is studied. Research indicates that increasing the sensing resistance of inductance current can make the converter with a smaller output capacitance time constant operate in a stable state and broaden the range of stable operation. Finally, the theoretical analysis was verified by simulation and experimental results. The results of this paper can be generalized to other switching converters, providing guidance for their design and optimization.
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