Coexisting fast-scale and slow-scale instability in current-mode controlled DC/DC converters: Analysis, simulation and experimental results

Yanfeng Chen, Chi Kong Tse, Shui Sheng Qiu, Lars Lindenmuller, Wolfgang Schwarz

Research output: Journal article publicationJournal articleAcademic researchpeer-review

93 Citations (Scopus)


This paper investigates the coexisting fast-scale and slow-scale bifurcations in simple dc/dc converters under peak current-mode control operating in continuous conduction mode. Our focus is the boost converter as it is a representative form of dc/dc converter requiring current-mode control. Effects of varying the input voltage and some chosen parameters on the qualitative behavior of the system are studied in detail. Analysis based on a nonlinear simplified discrete-time model, which takes into account the effects of parasitics, is performed to investigate the coexistence of fast-scale and slow-scale bifurcations, and to identify the different types of bifurcation. Boundaries of stable region, slow-scale bifurcation region, fast-scale bifurcation region, coexisting fast and slow-scale bifurcation region are identified. Experimental measurements of the boost converter are provided for verification of the analytical results.
Original languageEnglish
Pages (from-to)3335-3348
Number of pages14
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number10
Publication statusPublished - 10 Dec 2008


  • Bifurcation
  • Current-mode control
  • Dc/dc converters
  • Fast-scale instability
  • Slow-scale instability

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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