Efficiency Optimization in Class-D Audio Amplifiers

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Abstract

This paper presents a new power efficiency optimization routine for designing Class-D audio amplifiers. The proposed optimization procedure finds design parameters for the power stage and the output filter, and the optimum switching frequency such that the weighted power losses are minimized under the given constraints. The optimization routine is applied to minimize the power losses in a 130 W class-D audio amplifier based on consumer behavior investigations, where the amplifier operates at idle and low power levels most of the time. Experimental results demonstrate that the optimization method can lead to around 30 % of efficiency improvement at 1.3 W output power without significant effects on both audio performance and the efficiency at high power levels.
Original languageEnglish
Title of host publicationProceedings of Audio Engineering Society 138th Convention
Number of pages9
PublisherAudio Engineering Society
Publication date2015
Article number9286
Publication statusPublished - 2015
EventAudio Engineering Society 138th Convention - Warsaw, Poland
Duration: 7 May 201510 May 2015
Conference number: 138

Conference

ConferenceAudio Engineering Society 138th Convention
Number138
CountryPoland
CityWarsaw
Period07/05/201510/05/2015

Cite this

Yamauchi, A., Knott, A., Jørgensen, I. H. H., & Andersen, M. A. E. (2015). Efficiency Optimization in Class-D Audio Amplifiers. In Proceedings of Audio Engineering Society 138th Convention [9286] Audio Engineering Society.
Yamauchi, Akira ; Knott, Arnold ; Jørgensen, Ivan Harald Holger ; Andersen, Michael A. E. / Efficiency Optimization in Class-D Audio Amplifiers. Proceedings of Audio Engineering Society 138th Convention. Audio Engineering Society, 2015.
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title = "Efficiency Optimization in Class-D Audio Amplifiers",
abstract = "This paper presents a new power efficiency optimization routine for designing Class-D audio amplifiers. The proposed optimization procedure finds design parameters for the power stage and the output filter, and the optimum switching frequency such that the weighted power losses are minimized under the given constraints. The optimization routine is applied to minimize the power losses in a 130 W class-D audio amplifier based on consumer behavior investigations, where the amplifier operates at idle and low power levels most of the time. Experimental results demonstrate that the optimization method can lead to around 30 {\%} of efficiency improvement at 1.3 W output power without significant effects on both audio performance and the efficiency at high power levels.",
author = "Akira Yamauchi and Arnold Knott and J{\o}rgensen, {Ivan Harald Holger} and Andersen, {Michael A. E.}",
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booktitle = "Proceedings of Audio Engineering Society 138th Convention",
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Yamauchi, A, Knott, A, Jørgensen, IHH & Andersen, MAE 2015, Efficiency Optimization in Class-D Audio Amplifiers. in Proceedings of Audio Engineering Society 138th Convention., 9286, Audio Engineering Society, Audio Engineering Society 138th Convention, Warsaw, Poland, 07/05/2015.

Efficiency Optimization in Class-D Audio Amplifiers. / Yamauchi, Akira; Knott, Arnold; Jørgensen, Ivan Harald Holger; Andersen, Michael A. E.

Proceedings of Audio Engineering Society 138th Convention. Audio Engineering Society, 2015. 9286.

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

TY - GEN

T1 - Efficiency Optimization in Class-D Audio Amplifiers

AU - Yamauchi, Akira

AU - Knott, Arnold

AU - Jørgensen, Ivan Harald Holger

AU - Andersen, Michael A. E.

PY - 2015

Y1 - 2015

N2 - This paper presents a new power efficiency optimization routine for designing Class-D audio amplifiers. The proposed optimization procedure finds design parameters for the power stage and the output filter, and the optimum switching frequency such that the weighted power losses are minimized under the given constraints. The optimization routine is applied to minimize the power losses in a 130 W class-D audio amplifier based on consumer behavior investigations, where the amplifier operates at idle and low power levels most of the time. Experimental results demonstrate that the optimization method can lead to around 30 % of efficiency improvement at 1.3 W output power without significant effects on both audio performance and the efficiency at high power levels.

AB - This paper presents a new power efficiency optimization routine for designing Class-D audio amplifiers. The proposed optimization procedure finds design parameters for the power stage and the output filter, and the optimum switching frequency such that the weighted power losses are minimized under the given constraints. The optimization routine is applied to minimize the power losses in a 130 W class-D audio amplifier based on consumer behavior investigations, where the amplifier operates at idle and low power levels most of the time. Experimental results demonstrate that the optimization method can lead to around 30 % of efficiency improvement at 1.3 W output power without significant effects on both audio performance and the efficiency at high power levels.

M3 - Article in proceedings

BT - Proceedings of Audio Engineering Society 138th Convention

PB - Audio Engineering Society

ER -

Yamauchi A, Knott A, Jørgensen IHH, Andersen MAE. Efficiency Optimization in Class-D Audio Amplifiers. In Proceedings of Audio Engineering Society 138th Convention. Audio Engineering Society. 2015. 9286