Higher power density amplifiers

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

DOI

View graph of relations

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 improved soft switching capabilities. This results in a shift of losses from switching devices to filter inductors that 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.

Original languageEnglish
JournalAES: Journal of the Audio Engineering Society
Volume66
Issue number12
Pages (from-to)1051-1061
Number of pages11
ISSN1549-4950
DOIs
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

ID: 169150628