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Modelling of switched mode power converters using bond graph

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2 Author(s)
Umarikar, A.C. ; Centre for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India ; Umanand, L.

Modelling of the switched mode power converter (SMPC) involves obtaining the large signal, steady-state and small signal representations. Transfer functions and state equations are used for mathematical representation of the SMPC. Obtaining these dynamic models using a mathematical or graphical approach sometimes lead to loss of an intuitive understanding of the system dynamics. A unified graphical method of modelling SMPC using bond graphs is presented. Only the PWM DC-DC converters are considered. The concept of switched power junctions is used for modelling of switching phenomenon in the SMPC. This approach uses a logical process of graphical reduction, which ultimately results in the state equations of the large signal and small signal AC models of the SMPC including the steady-state equations of the SMPC. This method is applicable to SMPC, in both continuous conduction mode and discontinuous conduction mode The proposed modelling approach is illustrated by a few examples.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 1 )