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Conference paper

Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

In Proceedings of The139th Audio Engineering Society Convention — 2015

By Iversen, Niels Elkjær1,2; Schneider, Henrik1,2; Knott, Arnold1,2; Andersen, Michael A. E.1,2

From

Department of Electrical Engineering, Technical University of Denmark1

Electronics, Department of Electrical Engineering, Technical University of Denmark2

The typical nominal resistance span of an electro dynamic transducer is 4 Ω to 8 Ω. This work examines the possibility of driving a transducer with a much lower impedance to enable the amplifier and loudspeaker to be directly driven by a low voltage source such as a battery. A method for estimating the amplifier rail voltage requirement as a function of the voice coil nominal resistance is presented.

The method is based on a crest factor analysis of music signals and estimation of the electrical power requirement from a specific target of the sound pressure level. Experimental measurements confirms a huge performance leap in terms of efficiency compared to a conventional battery driven sound system.

Future optimization of low voltage, high current amplifiers for low impedance loudspeaker drivers are discussed.

Language: English
Publisher: Audio Engineering Society
Year: 2015
Proceedings: 139th International Audio Engineering Society (AES) Convention
Types: Conference paper
ORCIDs: Iversen, Niels Elkjær , Schneider, Henrik , Knott, Arnold and Andersen, Michael A. E.

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