Deriving The Canonical Equivalent Circuit For Small Signal & Low Frequency Ac Model For The Sepic And Zeta PWM Dc-dc Converters With Two-port Network

Enio V. Kassick

doi:10.18618/REP.20114.376382

Authors

Enio V. Kassick INEP-UFSC: Power Electronics Institute – Federal University of Santa Catarina – P.O. Box 5119, 88049-970 Florianópolis SC Brazil

DOI:

https://doi.org/10.18618/REP.20114.376382

Keywords:

Canonical Model, PWM CCM DC-DC Converters, Quadripoles,, Sepic Converter, Small Signal & Low Frequency AC Model, Zeta Converter

Abstract

PWM dc-dc converters operating in Continuous Conduction Mode (CCM) perform similar basic functions despite the topology of which one. The canonical equivalent circuit of small signal & low frequency ac model permits to analyze converter behavior in a general manner, without the need to make reference to a specific topology. For Buck, Boost, Buck-Boost and Cuk topologies the “plug-in” parameters of the canonical model can be easily found just by circuit manipulation using very simple circuit analysis techniques. For the Sepic (Single-Ended Primary Inductor Converter) and Zeta topologies, utilization of the same procedure fails and one cannot arrive to the canonical model. To overcome this barrier, some authors indicate the need to apply circuit synthesis techniques which are not always familiar to many engineers. It will be shown that it is possible to arrive to the canonical model of this two converter topologies by using the well-known two-port network (quadripoles) circuit analysis technique.

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Author Biography

Enio V. Kassick, INEP-UFSC: Power Electronics Institute – Federal University of Santa Catarina – P.O. Box 5119, 88049-970 Florianópolis SC Brazil

was born in Taquara RS in '56 and earned his engineering degree in '80 at Federal University of Rio Grande do Sul (UFRGS-Brazil), his M. Sc degree in '83 at Federal University of Santa Catarina (UFSC-Brazil) and his Dr. degree in '90 at Institut National Polytechnique de Toulouse (INPT-France). His is with INEP Power Electronics Institute of the Federal University of Santa Catarina since '81. In '83 he started his academic career at UFSC as a lecturer in the Electrical Engineering Dept and became a professor in '99. His research interests include power electronics and power quality. Dr. Kassick is currently a member of the Brazilian Power Electronics Society (SOBRAEP).

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