Stability Analysis of Closed Loop Switching Power Amplifiers based on an Accurate Model of a Loudspeaker Installed in a Bass Reflex Enclosure

Author

Gonzalez-Espin, Fran ; Figueres, Emilio ; Garcera, Gabriel ; Sandia, Jesus

Author_Institution

VMB Espanola S.A., Valencia

fYear

2007

fDate

4-7 June 2007

Firstpage

713

Lastpage

718

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 tested using a full-bridge power converter along with the proposed model of the transducer.

Keywords

closed loop systems; feedback amplifiers; loudspeakers; mathematics computing; power amplifiers; transducers; MATLAB software; Zobel network; bass reflex enclosure; closed loop switching power amplifiers; electrical-mechanical-acoustical parameters; full-bridge power converter; loudspeaker; output filter stage; stability analysis; transducer; voltage-mode control method; Filters; Loudspeakers; MATLAB; Mathematical model; Power amplifiers; Regulators; Software testing; Stability analysis; Transducers; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on

Conference_Location

Vigo

Print_ISBN

978-1-4244-0754-5

Electronic_ISBN

978-1-4244-0755-2

Type

conf

DOI

10.1109/ISIE.2007.4374684

Filename

4374684