Title :
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
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;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1329947
