Title: Steady state and averaged state space modelling of non-ideal boost converter

Authors: M. Arjun; Vineeth Patil

Addresses: A B 01, Department of Electrical and Electronics Engineering, MIT Manipal 576104, India ' A B 01, Department of Electrical and Electronics Engineering, MIT Manipal 576104, India

Abstract: Switched mode power converters are the most important circuits for battery powered applications such as hybrid electric vehicles, lighting systems as well as integrated circuits. These converters are usually studied in its ideal form. However, practical converters behave differently due to associated parasites and thus affect both steady state and stability. So, this paper analyses steady state and state space modelling of non-ideal boost converter. A converter is operated in both CCM and DCM modes. Models are derived by considering capacitance effects of diode and switch in addition to other parasites. The models derived are detailed and care has been taken to avoid assumptions and approximations though the models are very complex. The methodology adopted can be easily extended for other converters. Effect of every parasite and switching frequency on performance of the converter are clearly evaluated by plotting time domain and frequency domain plots in MATLAB. Simulation results show that there is a considerable deviation in performance of practical converters from its ideal case and the deviation is just not due to the inclusion of parasites but also due to the shift in operating point (duty cycle).

Keywords: pulse width modulation; PWM converters; steady state modelling; state space averaging; stability; continuous conduction mode; discontinuous conduction mode; power converters; simulation; non-ideal boost converters.

DOI: 10.1504/IJPELEC.2015.071204

International Journal of Power Electronics, 2015 Vol.7 No.1/2, pp.109 - 133

Received: 27 Mar 2015
Accepted: 21 Jun 2015
Published online: 16 Aug 2015 *

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