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Current-Driven Switch-Mode Audio Power Amplifiers

The conversion of electrical energy into sound waves by electromechanical transducers is proportional to the current through the coil of the transducer. However virtually all audio power amplifiers provide a controlled voltage through the interface to the transducer. This paper is presenting a switch-mode audio power amplifier not only providing controlled current but also being supplied by current. This results in an output filter size reduction by a factor of 6. The implemented prototype shows decent audio performance with THD+N below 0.1 %.

Authors: Knott, Arnold; Buhl, Niels Christian; Andersen, Michael A.E.
Affiliation: Technical University of Denmark, Lyngby, Denmark
AES Convention:132 (April 2012) Paper Number:8629 Import into BibTeX
Subject:Amps and Measurement

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