Switch-mode technology is greatly used for audio amplification. This is mainly due to the great efficiency this technology offers. Normally the efficiency of a switch-mode audio amplifier is measured using a sine wave input. However this paper shows that sine waves represent real audio very poorly. An alternative signal is proposed for test purposes. The efficiency of a switch-mode power audio amplifier is modelled and measured with both sine wave and the proposed test signal as inputs. The results show that the choice of switching devices with low on resistances are unfairly favored when measuring the efficiency with sine waves. A 10% efficiency improvement was found for low power outputs. It is therefore of great importance to use proper test signals when measuring the efficiency.
|Title of host publication||Proceedings of the 140th Audio Engineering Convention Convention|
|Number of pages||10|
|Publisher||Audio Engineering Society|
|Publication status||Published - 2016|
|Event||140th International Audio Engineering Society Convention - Paris, France|
Duration: 4 Jun 2016 → 7 Jun 2016
|Conference||140th International Audio Engineering Society Convention|
|Period||04/06/2016 → 07/06/2016|
Iversen, N. E., Knott, A., & Andersen, M. A. E. (2016). Efficiency of Switch-Mode Power Audio Amplifiers - Test Signals and Measurement Techniques. In Proceedings of the 140th Audio Engineering Convention Convention Audio Engineering Society.