Journal article
Higher power density amplifiers
This paper proposes a new switching strategy for switch-mode power audio amplifiers beneficial for the power dissipation in the switching devices of the power stage. The strategy is based on a thorough analysis of the loss mechanism and operating conditions of the power stage and how they relate to the audio input.
The strategy utilizes a high ripple current combined with full state control improve soft switching capabilities. This result in a shift of losses from switching devices to filter inductors which are less sensitive to loss variations due to a larger form factor. Measured results on 100 W test amplifiers show that the proposed strategy reduces the power dissipation within the switches causing up to 45◦C temperature reduction locally in the switches and up to 35◦C globally in the amplifier.
THD+N levels are down to 0.03 % and power density of implemented amplifiers are 6 W/cm3.
Language: | English |
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Year: | 2018 |
Pages: | 1051-1061 |
ISSN: | 15494950 and 00047554 |
Types: | Journal article |
DOI: | 10.17743/jaes.2018.0064 |
ORCIDs: | Iversen, Niels Elkjær , Dahl, Nicolai Jerram , Knott, Arnold and Andersen, Michael A. E. |