Title :
Small-signal model of PWM converters for discontinuous conduction mode and its application for boost converter
Author :
Reatti, Alberto ; Kazimierczuk, Marian K.
Author_Institution :
Dept. of Electron. & Telecommun., Florence Univ., Italy
Abstract :
A small-signal circuit model for pulsewidth-modulated DC-DC converters operated in discontinuous conduction mode is presented. The model is composed of controlled current sources, an independent voltage source and resistances. The principle of energy conservation approach is used to take into account parasitic resistances of the transistor and diode and the diode threshold voltage. The proposed model is suitable for small-signal, frequency-domain representation of the converters. This model is used to derive the expressions for a boost converter control-to-output transfer function, input-to-output voltage transfer function, input impedance and the output impedance. Bode plots are also given for these transfer functions. The predicted and experimental results were in excellent agreement.
Keywords :
DC-DC power convertors; PWM power convertors; equivalent circuits; linear network analysis; switching circuits; transfer functions; Bode plots; PWM DC-DC converters; boost converter; control-to-output transfer function; controlled current sources; diode parasitic resistance; discontinuous conduction mode; energy conservation; frequency-domain representation; independent voltage source; input impedance; input-to-output voltage transfer function; linear circuit model; output impedance; pulsewidth-modulated converters; resistances; small-signal circuit model; transistor parasitic resistance; Circuit simulation; DC-DC power converters; Diodes; Impedance; Mathematical model; Pulse width modulation converters; Switching circuits; Switching converters; Transfer functions; Voltage control;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
DOI :
10.1109/TCSI.2002.805709
