Class D audio amplifiers have gained significant influence in sound reproduction due to their high efficiency. One of the most commonly used control methods in these amplifiers is self-oscillation. A parameter of key interest in self-oscillating amplifiers is the switching frequency, which is known for its variation. Knowledge of switching frequency variations is of great importance with respect to electromagnetic interference (EMI). This paper will investigate, whether the switching frequency is depended on modulation index and audio reference frequency. Validation is done using simulations, and the results are compared with measurements performed on a 50 W prototype amplifier. The switching frequency is tracked through accurate spectrum measurements, and very good compliance with simulation results are observed.

Authors: Nielsen, Dennis; Knott, Arnold; Pfaffinger, Gerhard; Andersen, Michael A. E.
Affiliations: Harman/Becker Automative Systems GmbH, Straubing, Germany; Technical University of Denmark, Lyngby, Denmark(See document for exact affiliation information.)
AES Convention: 127 (October 2009) Paper Number: 7907
Publication Date: October 1, 2009
Subject: Transducers Manufacturing and Equipment

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