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| Fast-scale border collision bifurcation in SEPIC power factor pre-regulators |
| Liu Fang |
| State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China;
College of Electrical and Information Engineering, North China University for Nationalities, Yinchuan 750021, China |
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Abstract In this paper we report a kind of fast-scale instability occurring
in the single-ended primary inductance converter (SEPIC) power
factor pre-regulator, which is designed to operate in discontinuous
conduction mode. Main results are given by exact cycle-by-cycle
computer simulations as well as theoretical analysis. It is found
that the instability phenomenon manifests itself as a fast-scale
bifurcation at the switching period, which implies the occurrence of
border collision bifurcation, or is related to the transition of the
regular operating mode of the SEPIC. According to the theoretical
analysis and simulation results, the effects of parameters on system
stability, and the locations of the bifurcation points are
confirmed. Moreover, the effects of such an instability on power
factor and switching stress are also discussed. Finally, the
occurrence of the asymmetric bifurcation locations is investigated.
The results show that this work provides a convenient means of
predicting stability boundaries which can facilitate the selection
of the practical parameters.
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Received: 07 January 2008
Published: 09 July 2008
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| PACS: |
05.45.-a
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(Nonlinear dynamics and chaos)
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84.30.Jc
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(Power electronics; power supply circuits)
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84.70.+p
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(High-current and high-voltage technology: power systems; power transmission lines and cables)
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2008, Vol. 17 
