Tracking Multi-Level Power Power Supply for Class-D Audio Amplifiers

Nicolai Jerram Dahl, Niels Elkjær Iversen, Vladan Lazarevic, Michael A. E. Andersen, Miroslav Vasic

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    Abstract

    Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this paper proposes a Tracking Multi-Level Power Supply (TMLPS) in order to improve system efficiency. A simple prototype system is designed and tested up to 200W. Measured results show that employing a TMLPS can improve efficiency with a factor of 6 when playing music. In addition, the temperature rise of the amplifier is vastly reduced, especially for the switching power MOSFETs where it is halved from 100◦C to 50◦C. To further improve efficiency, an optimization method is proposed. The optimization considers the amplitude distribution of music signals and consumer behaviors. Simulations show that efficiency can be further improved by a factor of 1.23 with an optimized TMLPS
    compared to a simple uniform TMLPS solution.
    Original languageEnglish
    JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
    Volume9
    Issue number1
    Pages (from-to)156-166
    ISSN2168-6777
    DOIs
    Publication statusPublished - 2021

    Keywords

    • Class-D
    • Tracking power supply
    • Optimization
    • Audio systems
    • Multilevel systems

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