Analytical stability boundary for peak-current mode controlled SEPIC

Author

Cantillo, A. ; De Nardo, A. ; Femia, N. ; Zamboni, W.

Author_Institution

DIIIE, Univ. of Salerno, Fisciano, Italy

fYear

2010

fDate

28-30 June 2010

Firstpage

1

Lastpage

8

Abstract

Peak Current Controlled SEPIC (PCC-SEPIC) stability is discussed in this paper. Critical values of the coupling capacitance and of the current modulator gain for stability are analytically determined for loss-less converter by using a novel reduced order lossless ac model of PCC-SEPIC. A stability boundary is thus derived, unveiling a correlation among the coupling capacitance, the current modulator gain and the stability. The stability predictions provided by the loss-less model are compared with the results of simulations and experiments. A numerical investigation on PCC-SEPIC stability when resistive losses are taken into account is provided for a critical evaluation of the results obtained by means of the analytical loss-less model.

Keywords

DC-DC power convertors; electric current control; power inductors; stability; PCC-SEPIC stability; analytical stability boundary; coupling capacitance; current modulator gain; peak current controlled SEPIC; reduced lossless AC model; single-ended primary inductor converter; Circuit stability; Converters; Couplings; Frequency modulation; Numerical models; Numerical stability; Stability analysis; DC/DC converters; SEPIC; current mode control; switching converters stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Control and Modeling for Power Electronics (COMPEL), 2010 IEEE 12th Workshop on

Conference_Location

Boulder, CO

Print_ISBN

978-1-4244-7462-2

Electronic_ISBN

978-1-4244-7461-5

Type

conf

DOI

10.1109/COMPEL.2010.5562386

Filename

5562386