Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

Niels Elkjær Iversen; Henrik Schneider; Arnold Knott; Michael A. E. Andersen

Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

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

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Abstract

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.

Original language	English
Title of host publication	Proceedings of the139th Audio Engineering Society Convention.
Number of pages	8
Publisher	Audio Engineering Society
Publication date	2015
Publication status	Published - 2015
Event	139th International Audio Engineering Society (AES) Convention - The Jacob Javits Center, New York City, United States Duration: 29 Oct 2015 → 1 Nov 2015 http://www.aes.org/events/139/

Conference

Conference	139th International Audio Engineering Society (AES) Convention
Location	The Jacob Javits Center
Country/Territory	United States
City	New York City
Period	29/10/2015 → 01/11/2015
Internet address	http://www.aes.org/events/139/

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@inproceedings{50c07e025c4b499d8bee6a4a8c36ed3a,

title = "Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers",

abstract = "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.",

author = "Iversen, {Niels Elkj{\ae}r} and Henrik Schneider and Arnold Knott and Andersen, {Michael A. E.}",

year = "2015",

language = "English",

booktitle = "Proceedings of the139th Audio Engineering Society Convention.",

publisher = "Audio Engineering Society",

note = "139th International Audio Engineering Society (AES) Convention ; Conference date: 29-10-2015 Through 01-11-2015",

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TY - GEN

T1 - Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

AU - Iversen, Niels Elkjær

AU - Schneider, Henrik

AU - Knott, Arnold

AU - Andersen, Michael A. E.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

M3 - Article in proceedings

BT - Proceedings of the139th Audio Engineering Society Convention.

PB - Audio Engineering Society

T2 - 139th International Audio Engineering Society (AES) Convention

Y2 - 29 October 2015 through 1 November 2015

ER -

Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

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