Title :
Small-signal analysis of open-loop PWM flyback dc-dc converter for CCM
Author :
Kazimierczuk, Marian K. ; Nguyen, Sonny T.
Author_Institution :
Dept. of Electr. Eng., Wright State Univ., Dayton, OH, USA
Abstract :
A flyback dc-dc converter is obtained from the conventional buck-boost converter by replacing the inductor with an isolation transformer. A transformer in the flyback converter is used to achieve a dc isolation between the input and the output of the converter. This paper presents dc and small-signal circuit models for the flyback converter for continuous conduction mode (CCM). The parasitic components are included in these models. The dc model is used to derive the equations for the dc voltage transfer function and the efficiency. The small-signal model is used to derive the equations for the open-loop small-signal transfer functions, such as control-to-output transfer function, input-to-output transfer function, input impedance, and output impedance. Bode plots are also given for the small-signal transfer functions
Keywords :
Bode diagrams; DC-DC power convertors; PWM power convertors; network analysis; transfer functions; Bode plots; CCM; buck-boost converter; continuous conduction mode; control-to-output transfer function; dc isolation; dc model; dc voltage transfer function; dc-dc converter; equations; input impedance; input-to-output transfer function; isolation transformer; open-loop PWM flyback; open-loop small-signal transfer functions; output impedance; parasitic components; small-signal analysis; small-signal model; small-signal transfer functions; Circuits; DC-DC power converters; Equations; Impedance; Inductors; Open loop systems; Pulse width modulation; Pulse width modulation converters; Transfer functions; Voltage;
Conference_Titel :
Aerospace and Electronics Conference, 1995. NAECON 1995., Proceedings of the IEEE 1995 National
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-2666-0
DOI :
10.1109/NAECON.1995.521914
