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Modelling and Control of Class-D Power Amplifiers for Vented-Box Loudspeaker Systems

The purpose of this paper is to analyze the stability of closed loop switching power amplifiers using an accurate model of a loudspeaker installed in a commonly used bass reflex enclosure instead of the purely resistive model that can be used with a Zobel network. The model takes into account the electrical-mechanical-acoustical parameters of the transducer as well as the voice-coil loudspeaker’s non-linear behavior, avoiding stability problems when trying to compensate for the output filter stage, thus obtaining better THD figures. This model has been experimentally tested and then used to design a regulator for Voltage-Mode Control method by means of MATLAB software. The regulator has been simulated using a full-bridge power converter along with the proposed model of the transducer.

Authors: Figueres, Emilio; Garcera, Gabriel; Gonzalez-Espin, Fran; Sandia, Jesus
Affiliations: Univ. Politécnica de Valencia; VMB(See document for exact affiliation information.)
AES Conference:31st International Conference: New Directions in High Resolution Audio (June 2007)
Paper Number:5 Import into BibTeX
Subject:High Resolution Audio

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