Title :
Exact nonlinear analysis of switched mode power converters
Author :
Ilic, Marija ; Laeb, S. ; Liebezeit, Kurt
Author_Institution :
MIT, Cambridge, MA, USA
Abstract :
A basis is established for an efficient formulation of converter dynamical models in their closed-loop operation. Difficulties in applying small-signal models are illustrated for the power supply studied. It is then shown that rather than ignoring the effect of the duty ratio dynamics, it is possible to derive a consistent simple model for analysis and control design. A second-order nonlinear model is obtained that fully captures long-term dynamics of a typical power supply. The model could serve as a basis for identifying typical instability regions of the power supply´s operation (negative resistance), and for a control design by which instabilities are avoided.<>
Keywords :
nonlinear network analysis; power convertors; power supply circuits; switching circuits; closed-loop operation; control design; dynamical models; exact nonlinear analysis; instability regions; long-term dynamics; power supply; second-order nonlinear model; switched mode power converters; Aircraft; Buck converters; Circuit stability; Control design; Feedback loop; Open loop systems; Power electronics; Power supplies; Switched-mode power supply; Switching converters;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18233
