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Averaging Method for PWM DC-DC Converters Operating in Discontinuous Conduction Mode with Feedback

Author(s): N.M. ADAMALI SHAH, Mohammed S. Al-Numay

Journal: International Journal of Engineering
ISSN 1985-2312

Volume: 5;
Issue: 3;
Start page: 257;
Date: 2011;
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Keywords: Switched Systems | Pulse-width Modulation (PWM) | Power Converter | Discrete TimeModeling | one-cycle-averaging | Sampled Data Model.

In this paper, a one-cycle-average (OCA) discrete-time model for PWM dc-dc converter basedonclosed-loop control method for discontinuous conduction mode (DCM) is presented. It leadstoexact discrete-time mathematical representation of the OCA values of the output signal evenatlow frequency. It also provides the exact discrete-time mathematical representation oftheaverage values of other internal signals with little increase in simulation time. A comparison ofthismodel to other existing models is presented through a numerical example of boostconverter.Detailed simulation results confirm the better accuracy and speed of the proposedmodel.
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