Experimental Validation with a Control Point of View Analysis of the SEPIC Converter

Ali Jaafar (1) , Pierre Lefranc (1) , Emmanuel Godoy (1) , Xuefang Lin-Shi (2) , A. Fayaz (1) , L. Nan (2)

1 E3S - Supélec Sciences des Systèmes
2 INSA Lyon - Institut National des Sciences Appliquées de Lyon

This paper presents a theoretical study with experimental validation carried out on a DC-DC SEPIC converter operating in continuous conduction mode (CCM). Two dynamic modeling techniques are adopted and various aspects of the converter's operating modes are analyzed. Simulations of transient and frequency responses are verified with experimental results. A PI control law is used to validate responses to load and reference voltage variations with parasitic losses taken into account. An in-depth analysis of the effects of unstable zeros of the transfer function, from the duty cycle to the output voltage, on the implementation of control laws is also presented. The frequency behavior of the converter along with the stability margins are found to be widely influenced by load resistance and duty cycle variations.

Domaines: Automatique / Robotique; Energie électrique

Ali Jaafar, Pierre Lefranc, Emmanuel Godoy, Xuefang Lin-Shi, A. Fayaz, et al.. Experimental Validation with a Control Point of View Analysis of the SEPIC Converter. 2009 35th Annual Conference of IEEE Industrial Electronics, Nov 2009, Porto, Portugal. pp.CD-Rom Proceedings, ⟨10.1109/IECON.2009.5414966⟩. ⟨hal-00417696⟩