Abstract—Various aspects for the averaged modelling of the Boost converters operating in the discontinuous conduction mode (DCM) are studied. The parasitics of the Boost converter are also considered. A duty ratio constraint that defines the diode conduction interval is identified to be the key for accurate prediction of high-frequency behaviour. A new duty-ratio constraint is proposed that leads to the full-order averaged models of DCM converters. Numerical analyses and experimental measurements confirm that the new models correctly predict the small-signal responses up to the half of switching frequency and are more accurate than previous models. Moreover, the analytical results are included to show the origin of the high-frequency pole in DCM operation and to explain why the full-order model is capable of accurately predicting it.

Index Terms—Parabolic Equation, dehydration, tropical herbs, iterative methods, heat and mass transfer.

Md. Rajibul Islam was with the Faculty of Information Science and Technology (FIST), Multimedia University, 75450 Melaka, Malaysia. He is currently working as a Research Assistant in Ibnu Sina Institute, Faculty of Science, University Technology Malaysia, 81310 UTM Skudai, Johor.(Corresponding author’s mobile: +60-162-489860; e-mail:md.rajibul.islam05@mmu.edu.my).
Dr. Norma Alias is with Ibnu Sina Institute, Faculty of Science, University Technology Malaysia, 81310 UTM Skudai, Johor. She is working as a Senior Lecturer as well as a Researcher in the mathematic department, UTM. (Phone: +60-755-36041; Mobile: +60-127-299094).

Cite: Md. Rajibul Islam and Norma Alias, "Some Numerical Methods for Temperature and Mass Transfer Simulation on the Dehydration of Herbs," International Journal of Computer and Electrical Engineering vol. 2, no. 4, pp. 723-729, 2010.