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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