Novel control design for the buck converter

Author

Ioannidis, G. ; Kandianis, A. ; Manias, S.N.

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Greece

Volume

145

Issue

1

fYear

1998

fDate

1/1/1998 12:00:00 AM

Firstpage

39

Lastpage

47

Abstract

A novel control design approach for average current-mode controlled buck power converter is presented. The buck converter large-signal averaged model is shown to be easily large-signal linearisable. The linear model is then examined as a multivariable system with no inner and outer loops, using both the state-space and frequency domain descriptions. Transfer functions of the system are derived as a function of the desired closed-loop poles, simplifying the design procedure and bringing forward all the important characteristics of the closed-loop system. Several advantages can be gained by the use of capacitor current instead of inductor current feedback. Theoretical analysis is applied and confirmed with simulation and experimental results on a 250 W prototype. The proposed approach can be used with all small-signal linear models of DC-DC power converters, offering simplicity and a better insight on system characteristics

Keywords

DC-DC power convertors; closed loop systems; control system analysis; control system synthesis; electric current control; frequency-domain analysis; linearisation techniques; multivariable control systems; poles and zeros; state-space methods; transfer functions; 250 W; DC-DC power converters; average current-mode control; buck power converter; closed-loop poles; control design; control performance; control simulation; frequency domain description; linear model; multivariable system; small-signal linear models; state-space description; transfer functions;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19981486

Filename

655171