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Chin. Phys. B, 2010, Vol. 19(8): 080511    DOI: 10.1088/1674-1056/19/8/080511
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Intermittency and bifurcation in SEPICs under voltage-mode control

Liu Fang
College of Electrical and Information Engineering, North China University for Nationalities, Yinchuan 750021, China
Abstract  A stroboscopic map for voltage-controlled single ended primary inductor converter (SEPIC) with pulse width modulation (PWM) is presented, where low-frequency oscillating phenomena such as quasi-periodic and intermittent quasi-periodic bifurcations occurring in the system are captured by numerical and experimental methods. According to bifurcation diagrams and nonlinear dynamical theory, the characteristics of the low-frequency oscillation and the mechanism for the appearance of the low-frequency oscillation are investigated. It is shown that as the controller parameter varies, the change in the conduction mode takes place from the continuous conduction mode (CCM) under the originally stable period one and high periodic orbits to the intermittent changes between CCM and discontinuous conduction mode (DCM), which may be related to the losing stability of the system and brought the system to exhibiting low-frequency oscillating behaviour in the time domain. Moreover, the occurrence of the intermittent quasi-periodic oscillation reflects that the system undergoes a Neimark–Sacker bifurcation.
Keywords:  low-frequency oscillation      intermittency      single ended primary inductor converter      Neimark–Sacker bifurcation     
Received:  22 April 2009      Published:  15 August 2010
PACS:  84.30.Jc (Power electronics; power supply circuits)  
  02.30.Oz (Bifurcation theory)  
  84.32.Hh (Inductors and coils; wiring)  
  84.40.Ua (Telecommunications: signal transmission and processing; communication satellites)  
Fund: Project supported by the Natural Science Foundation of Ningxia Autonomous Region, China (Grant No. NZ0954).

Cite this article: 

Liu Fang Intermittency and bifurcation in SEPICs under voltage-mode control 2010 Chin. Phys. B 19 080511

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