Modeling and analysis of a self-oscillating peak-current controlled flyback converter

Author

Lempinen, Juha ; Suntio, Teuvo

Author_Institution

DIARC-Technol. Oy, Espoo, Finland

Volume

2

fYear

2001

fDate

2001

Firstpage

960

Abstract

The modeling of a self-oscillating peak-current controlled flyback power converter is presented. Transfer functions describing the output dynamics of a flyback converter are obtained by applying partial derivatives to the nonlinear state equations that are derived using proposed modeling method. The loop gain of a practical 3-W flyback converter was measured and compared to predictions. The time delay in boundary mode showed not significant influence on the converter dynamics in the load range of interest. The nonminimum phase characteristics of a flyback converter will limit the achievable controller bandwidth also in a variable-frequency operation similar to the fixed-frequency operation in CICM and DICM

Keywords

DC-DC power convertors; circuit oscillations; switched mode power supplies; transfer functions; 3 W; DC/DC power conversion; boundary mode time delay; fixed-frequency operation; loop gain; nonlinear state equations; nonminimum phase characteristics; output dynamics transfer functions; self-oscillating peak-current controlled flyback converter; variable-frequency operation; Capacitors; Delay effects; Electric variables control; Inductors; Laboratories; Phase change materials; Switches; Switching converters; Switching frequency; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE

Conference_Location

Denver, CO

Print_ISBN

0-7803-7108-9

Type

conf

DOI

10.1109/IECON.2001.975896

Filename

975896