Title :
A topological comparison of PWM and hysteresis controls in switching audio amplifiers
Author :
Pillonnet, Gaël ; Cellier, Rémy ; Allier, Emmanuel ; Abouchi, Nacer ; Nagari, Angelo
Author_Institution :
Adv. Audio Res. Lab. at CPE Lyon - INL, Lyon
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
The switching audio amplifiers are widely used in various portable and consumer electronics because of their high efficiency, but suffer from low audio performances due to inherent nonlinearity. This problem can be limited with efficient feedback from the output power stage. The research community focuses now to the efficient error correction by feedback control systems. This paper proposes a theoretical and practical comparison between the PWM control and our proposed hysteresis solution. These topologies are widely used in a very wide range of applications. This work shows that the hysteresis solution offers both lower power consumption and higher audio performances for embedded audio application.
Keywords :
audio-frequency amplifiers; error correction; pulse width modulation; PWM control; consumer electronics; embedded audio; error correction; feedback control systems; hysteresis control; lower power consumption; portable electronics; switching audio amplifiers; Consumer electronics; Energy consumption; Error correction; Feedback control; Hysteresis; Output feedback; Power amplifiers; Power generation; Pulse width modulation; Topology; PWM feedback; Switching audio amplifiers; hysteresis control; linearity;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746112