Title :
Design of closed loop audio power amplifiers by means of an accurate model of vented box loudspeakers
Author :
González-Espín, F.J. ; Figueres, E. ; Garcerá, G. ; Sandia, J.
Author_Institution :
Camino de Vera S/N, Valencia
Abstract :
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.
Keywords :
audio-frequency amplifiers; closed loop systems; loudspeakers; mathematics computing; power amplifiers; power convertors; stability; transducers; voltage control; MATLAB software; closed loop audio power amplifiers; electrical-mechanical-acoustical parameters; full-bridge power converter; stability; switching power amplifiers; transducer; vented box loudspeakers; voice-coil loudspeaker; voltage-mode control; Filters; Loudspeakers; MATLAB; Mathematical model; Power amplifiers; Regulators; Software testing; Stability analysis; Transducers; Voltage control; Efficiency; Modelling; Simulation;
Conference_Titel :
Power Electronics and Applications, 2007 European Conference on
Conference_Location :
Aalborg
Print_ISBN :
978-92-75815-10-8
Electronic_ISBN :
978-92-75815-10-8
DOI :
10.1109/EPE.2007.4417717
