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Grazing, skipping and sliding : analysis of the non-smooth dynamics of the DC/DC buck converter

Research output: Working paperWorking paper and Preprints

Original languageEnglish
StatePublished - 1997


In this paper, we provide an analytical insight into the observed nonlinear behaviour of the buck converter and link this with the study of a wider class of piecewise-smooth systems. After introducing the buck converter model and background, we describe the most fascinating features of its dynamical behaviour. We then introduce the so-called grazing and sliding solutions and discuss their role in determining many of the buck converter's dynamical oddities. In particular, a local map is studied which explains how the grazing bifurcations cause sharp turning points in the bifurcation diagram of periodic orbits. Moreover, we show how these orbits accumulate onto a sliding trajectory through a "spiralling" impact adding scenario. The structure of such a diagram is derived analytically and is shown to be closely related to the analysis of homoclinic bifurcations. The results are shown to match perfectly with numerical simulations. The sudden jump to large-scale chaos and the fingered structure of the resulting attractor are also explained.

Additional information

Additional information: Preprint of a paper later published by IOP Publishing (1998), Nonlinearity, 11 (4), pp.859-890, ISSN 0951-7715

Research areas

  • grazing and sliding solutions, dynamical behaviour, large-scale chaos, piecewise-smooth systems, homoclinic bifurcations, buck converter

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