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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Research of the adaptive control on modulation factor for PSR fly-back PSM converter

  • Tian, Lei (Institute of Modern Physics, Northwest University) ;
  • Li, Qinqin (Department of Electronic Engineering, Xidian University, CAD Institute) ;
  • Wang, Weiheng (Institut Sup Galilee, Universite Paris 13)
  • Received : 2017.12.11
  • Accepted : 2018.07.05
  • Published : 2019.02.12
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Abstract

The energy balance (EB) model of a primary side regulation (PSR) fly-back converter in the discontinuous conduction mode (DCM) is discussed in this paper. Based on this EB model, the stability of a PSR fly-back converter in the pulse skipping mode (PSM) is analyzed, and a self-adapting modulation factor control strategy is proposed. Theoretical analysis and simulation results show that by saving an optocoupler and correlative circuits, which are necessary in traditional PSM fly-back converters, the modulation factor tolerance controlled by this method is 1.26% on average, corresponding to the ideal value. Compared with traditional fly-back PSM controllers, the power saved in the sampler/comparator modules is 87% on average for a load range of $1{\Omega}$ to $1k{\Omega}$.

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References

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