Low-frequency oscillation in digitally controlled DC-DC Buck converters | Zendy

Zhang Xiao-Tian | Zendy; Xikui Ma | Zendy; Hao Zhang | Zendy

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Low-frequency oscillation in digitally controlled DC-DC Buck converters

Author(s) -

Zhang Xiao-Tian,

Xikui Ma,

Hao Zhang

Publication year - 2008

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.57.6174

Subject(s) - buck converter , oscillation (cell signaling) , bifurcation , physics , amplitude , frequency domain , converters , low frequency oscillation , eigenvalues and eigenvectors , low frequency , control theory (sociology) , stability (learning theory) , mathematical analysis , computer science , voltage , mathematics , optics , nonlinear system , power (physics) , electric power system , genetics , control (management) , quantum mechanics , astronomy , artificial intelligence , machine learning , biology

The z-domain model of digitally controlled Buck converter is derived by only considering the effect of sampler-and-holder. Based on the z-domain model, the cause of the low-frequency bifurcation is analyzed. The location and type of the bifurcation point when a system loses stability is predicted in terms of the system eigenvalues. Moreover, the frequency and the amplitude of the low-frequency oscillation, i.e., the wave equations, are deduced. These theoretical results are verified by PSpice simulations.

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