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

Zhang Xiao-Tian Ma Xi-Kui Zhang Hao

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

Zhang Xiao-Tian, Ma Xi-Kui, Zhang Hao
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  • Abstract views:  4387
  • PDF Downloads:  2590
  • Cited By: 0
Publishing process
  • Received Date:  03 January 2008
  • Accepted Date:  13 May 2008
  • Published Online:  05 May 2008

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

  • 1. 西安交通大学电气工程学院电力设备电气绝缘国家重点实验室,西安 710049

Abstract: 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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