Choosing the most suitable analogue redesign method for forward-type digital power converters

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This work proposes a method to objectively determine the most suitable analogue redesign method for forward type converters under digital voltage mode control. Particular emphasis is placed on determining the method which allows 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 have the largest phase margins. 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 correlation between the simulation and experimental results is presented. This work will allow designers to confidently choose the analogue redesign method which yields the greater phase margin for their application.
    Original languageEnglish
    Title of host publication2012 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
    Place of PublicationPiscataway
    PublisherIEEE
    Pages1-6
    ISBN (Print)9781467345064
    DOIs
    Publication statusPublished - 1 Dec 2012

    Keywords

    • DC-DC power conversion, Digital control, Discrete transforms, Frequency domain analysis, Power electronics, Switched mode power supplies

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