Title :
Modeling and analysis of a self-oscillating peak-current controlled flyback converter
Author :
Lempinen, Juha ; Suntio, Teuvo
Author_Institution :
DIARC-Technol. Oy, Espoo, Finland
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;
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
DOI :
10.1109/IECON.2001.975896
