Analyzing stability issues in a cascaded converter system comprised of two voltage-mode controlled dc-dc converters

Author

Ahmadi, Reza ; Paschedag, Darren ; Ferdowsi, Mehdi

Author_Institution

Electr. Eng. Dept., Missouri Univ. of Sci. & Technol., Rolla, MO, USA

fYear

2011

fDate

6-11 March 2011

Firstpage

1769

Lastpage

1775

Abstract

This work analyzes the stability of a cascaded converter system comprised of two dc-dc converters operating with voltage-mode controllers. First it develops a single converter small-signal model and derives the mathematical representation of the converter from it. Next, it derives the required closed-loop transfer functions and input and output impedances from the model. Then, it develops the cascaded converter model based on the derived closed-loop impedances and the single converter model. Finally, it derives the cascaded converter system transfer function which addresses the stability of the system and analyzes the stability based on this transfer function.

Keywords

DC-DC power convertors; closed loop systems; stability; transfer functions; voltage control; DC-DC converters; cascaded converter system; closed-loop impedances; closed-loop transfer functions; converter small-signal model; stability; voltage-mode controllers; Converters; Impedance; Integrated circuit modeling; Mathematical model; Stability analysis; Transfer functions; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744836

Filename

5744836