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LIU Sucheng,LI Qingqing,LIU Xiaodong,FANG Wei.Formulation of General Large-signal Adaptive Control Strategy for DC-DC Converter[J].JOURNAL OF POWER SUPPLY,2018,16(3):16-22
Formulation of General Large-signal Adaptive Control Strategy for DC-DC Converter
Received:September 18, 2016  Revised:August 07, 2017
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DOI:10.13234/j.issn.2095-2805.2018.3.16
Keywords:DC-DC switching converter  adaptive control  large-signal control  weighted function
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
           
AuthorInstitutionEmail
LIU Sucheng School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan , China liusucheng@ahut.edu.cn,scliu@cqu.edu.cn
LI Qingqing School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan , China
LIU Xiaodong School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan , China
FANG Wei School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan , China
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Abstract:
      A general large-signal adaptive control strategy for a DC-DC converter is proposed to deal with its wide-range operations. The global operation space of the DC-DC converter is divided into several local subspaces, then small-signal modeling and linear compensation design are performed respectively. With convex combination, a global control structure is constructed by linear compensators in each subspace via weighted functions that automatically determine the weighted coefficients of every local linear compensator, which makes the controller possesses a region-adaptive functionality. According to the proposed large-signal controller, the nonlinear control problem of the DC-DC converter can be resolved indirectly through linear compensation approaches, by which, the advantages of clear physical meaning and easy design of the classical frequency-domain methods are preserved. Finally, with the basic DC-DC converter and cascaded DC-DC converter as study objects, the design process of the large-signal control strategy was illustrated, and the effectiveness of this strategy was verified by experimental and simulation results.
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