Title :
Subharmonic oscillations in converters with current-mode programming under large parameter variations
Author :
Pavljasevic, Stjepan ; Maksimovic, Dragan
Author_Institution :
Inst. of Phys., Beograd, Yugoslavia
Abstract :
This paper presents analysis of subharmonic oscillations under large parameter and large signal variations in a converter with current-mode programming. Onset of oscillations is investigated through analysis of period-doubling bifurcation. The analysis is based on a nonlinear discrete-time model derived under the assumption of piecewise linearity of the system but without the usual linear-ripple approximation. Results are confirmed by measurements on an experimental converter and by simulations. It is also shown that a model based on the linear-ripple approximation gives erroneous results both quantitatively and qualitatively
Keywords :
bifurcation; discrete time systems; electric current control; nonlinear control systems; oscillations; power convertors; programmed control; converters; current-mode programming; large parameter variations; linear-ripple approximation; nonlinear discrete-time model; period-doubling bifurcation; piecewise linearity; subharmonic oscillations; Bifurcation; Eigenvalues and eigenfunctions; Linear approximation; Linear circuits; Nonlinear systems; Piecewise linear approximation; Piecewise linear techniques; Predictive models; Switching circuits; Switching converters;
Conference_Titel :
Power Electronics Specialists Conference, 1997. PESC '97 Record., 28th Annual IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-3840-5
DOI :
10.1109/PESC.1997.616940
