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

doi:10.1109/APEC.2018.8341043

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 proceeding › Article in proceedings › Research › peer-review

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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 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 language	English
Title of host publication	Proceedings of APEC 2018
Number of pages	6
Publisher	IEEE
Publication date	2018
Pages	406-411
DOIs	https://doi.org/10.1109/APEC.2018.8341043
Publication status	Published - 2018
Event	2018 IEEE Applied Power Electronics Conference and Exposition - Henry B. Gonzalez Convention Center, San Antonio, United States Duration: 4 Mar 2018 → 8 Mar 2018

Conference

Conference	2018 IEEE Applied Power Electronics Conference and Exposition
Location	Henry B. Gonzalez Convention Center
Country	United States
City	San Antonio
Period	04/03/2018 → 08/03/2018

Keywords

Envelope tracking
Switch-mode power amplifiers
Audio
Efficiency

Access to Document

10.1109/APEC.2018.8341043

Multilevel tracking power supply for switch mode audio power amplifiersAccepted author manuscript, 1.49 MB

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Cite this

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title = "Multilevel tracking power supply for switch-mode audio power amplifiers",

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 paperproposes 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.",

keywords = "Envelope tracking, Switch-mode power amplifiers, Audio, Efficiency",

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year = "2018",

doi = "10.1109/APEC.2018.8341043",

language = "English",

pages = "406--411",

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note = "2018 IEEE Applied Power Electronics Conference and Exposition, APEC 2018 ; Conference date: 04-03-2018 Through 08-03-2018",

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AU - Iversen, Niels Elkjær

AU - Lazarevic, Vladan

AU - Vasic, Miroslav

AU - Knott, Arnold

AU - Andersen, Michael A. E.

AU - Cobos, Jose A.

PY - 2018

Y1 - 2018

N2 - 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 paperproposes 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.

AB - 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 paperproposes 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.

KW - Envelope tracking

KW - Switch-mode power amplifiers

KW - Audio

KW - Efficiency

U2 - 10.1109/APEC.2018.8341043

DO - 10.1109/APEC.2018.8341043

M3 - Article in proceedings

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EP - 411

BT - Proceedings of APEC 2018

PB - IEEE

T2 - 2018 IEEE Applied Power Electronics Conference and Exposition

Y2 - 4 March 2018 through 8 March 2018

ER -