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
Publication Date: April 26, 2012
Subject: Amps and Measurement

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