A new topology for a sigma-delta audio power amplifier

Author

Zorzano Martinez, A. ; Beltran Blazquez, F. ; Beltran Blazquez, J.R.

Author_Institution

Dept. of Electr. Eng., La Rioja Univ., Logrono, Spain

Volume

5

fYear

2004

fDate

23-26 May 2004

Abstract

An inverter topology based on high frequency power conversion and sigma-delta modulation is proposed. Sigma-delta technique is particularly an attractive idea in audio power amplifying area. Analysis of this technique is presented. Power modulation is a way to obtain power amplifiers with better efficiency than conventional linear power amplifiers. A quasi-resonant converter with sigma-delta modulation input has been integrated to reduce switching losses, allowing high frequency operation. Audio power amplifier and isolated high power supply are integrated in one unit and analyzed. Simulations are performed to backup the analysis.

Keywords

audio systems; power amplifiers; resonant invertors; sigma-delta modulation; audio amplifying; high frequency operation; high frequency power conversion; high power supply; inverter topology; linear power amplifiers; power modulation; quasiresonant converter; sigma-delta audio power amplifier; sigma-delta modulation; switching losses reduction; Delta-sigma modulation; Frequency conversion; High power amplifiers; Power amplifiers; Power conversion; Power supplies; Resonant inverters; Switching converters; Switching loss; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1329947

Filename

1329947