Efficiency of Switch-Mode Power Audio Amplifiers - Test Signals and Measurement Techniques

Niels Elkjær Iversen, Arnold Knott, Michael A. E. Andersen

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Abstract

Switch-mode technology is greatly used for audio amplification. This is mainly due to the great efficiency this technology offers. Normally the efficiency of a switch-mode audio amplifier is measured using a sine wave input. However this paper shows that sine waves represent real audio very poorly. An alternative signal is proposed for test purposes. The efficiency of a switch-mode power audio amplifier is modelled and measured with both sine wave and the proposed test signal as inputs. The results show that the choice of switching devices with low on resistances are unfairly favored when measuring the efficiency with sine waves. A 10% efficiency improvement was found for low power outputs. It is therefore of great importance to use proper test signals when measuring the efficiency.
Original languageEnglish
Title of host publicationProceedings of the 140th Audio Engineering Convention Convention
Number of pages10
PublisherAudio Engineering Society
Publication date2016
Publication statusPublished - 2016
Event140th International Audio Engineering Society Convention - Paris, France
Duration: 4 Jun 20167 Jun 2016

Conference

Conference140th International Audio Engineering Society Convention
CountryFrance
CityParis
Period04/06/201607/06/2016

Cite this

Iversen, N. E., Knott, A., & Andersen, M. A. E. (2016). Efficiency of Switch-Mode Power Audio Amplifiers - Test Signals and Measurement Techniques. In Proceedings of the 140th Audio Engineering Convention Convention Audio Engineering Society.