Lookup NU author(s): Dr Haimeng Wu,
Professor Volker Pickert,
Dr Damian Giaouris,
Dr Bing Ji
This is the final published version of an article that has been published in its final definitive form by IEEE, 2017.
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Switched-mode power converters are inherently nonlinear and piecewise smooth systems which may exhibit a series of undesirable operations that can greatly reduce the converter’s efficiency and lifetime. This paper presents a nonlinear analysis technique to investigate the influence of system parameters on the stability of interleaved boost converters. In this approach, Monodromy matrix which contains all the comprehensive information of converter parameters and control loop can be employed to fully reveal and understand the inherent nonlinear dynamics of interleaved boost converters, including the interaction effect of switching operation. Thereby not only the boundary conditions but also the relationship between stability margin and the parameters given can be intuitively studied by the eigenvalues of this matrix. Furthermore, employing the knowledge gained from this analysis a real time cycle to cycle variable slope compensation method is proposed to guarantee a satisfactory performance of the converter with an extended range of stable operation. Outcomes show that systems can regain stability by applying the proposed method within a few time periods of switching cycles. The numerical and analytical results validate the theoretical analysis, and experimental results verify the effectiveness of the proposed approach.
Author(s): Wu H, Pickert V, Giaouris D, Ji B
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Power Electronics
Online publication date: 07/11/2016
Acceptance date: 24/10/2016
ISSN (print): 0885-8993
ISSN (electronic): 1941-0107
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