Multilevel tracking power supply for switch-mode audio power amplifiers

Niels Elkjær Iversen, Vladan Lazarevic, Miroslav Vasic, Arnold Knott, Michael A. E. Andersen, Jose A. Cobos

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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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 to employ envelope tracking techniques to the power supply in order to improve efficiency. A 100 W prototype system was designed. Measured results show that systems employing envelope tracking can improve system efficiency from 2% to 12%, i.e. a factor of 6. The temperature rise is strongly reduced, especially for the switching power MOSFETs where it is halved from 100 ◦C to 50 ◦C.
Original languageEnglish
Title of host publicationProceedings of APEC 2018
Number of pages6
Publication date2018
Publication statusPublished - 2018
Event2018 IEEE Applied Power Electronics Conference and Exposition - Henry B. Gonzalez Convention Center, San Antonio, United States
Duration: 4 Mar 20188 Mar 2018


Conference2018 IEEE Applied Power Electronics Conference and Exposition
LocationHenry B. Gonzalez Convention Center
Country/TerritoryUnited States
CitySan Antonio
Internet address


  • Envelope tracking
  • Switch-mode power amplifiers
  • Audio
  • Efficiency


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