Systematic selection of analogue redesign method for forward-type digital power converters

Kim Cave-Ayland, Victor Becerra, Ben Potter, Ali Shirsavar

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    Abstract

    This article proposes a systematic approach to determine the most suitable analogue redesign method to be used for forward-type converters under digital voltage mode control. The focus of the method is to achieve the highest phase margin at the particular switching and crossover frequencies chosen by the designer. It is shown that at high crossover frequencies with respect to switching frequency, controllers designed using backward integration have the largest phase margin; whereas at low crossover frequencies with respect to switching frequency, controllers designed using bilinear integration with pre-warping have the largest phase margins. An algorithm has been developed to determine the frequency of the crossing point where the recommended discretisation method changes. An accurate model of the power stage is used for simulation and experimental results from a Buck converter are collected. The performance of the digital controllers is compared to that of the equivalent analogue controller both in simulation and experiment. Excellent closeness between the simulation and experimental results is presented. This work provides a concrete example to allow academics and engineers to systematically choose a discretisation method.
    Original languageEnglish
    Pages (from-to)667-680
    Number of pages14
    JournalInternational Journal of Electronics
    Volume101
    Issue number5
    Early online date10 Jun 2013
    DOIs
    Publication statusPublished - May 2014

    Keywords

    • DC-DC power conversion
    • digital control
    • discrete transforms
    • frequency domain analysis
    • power electronics
    • switched mode power supplies

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