Higher power density amplifiers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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

Cite this

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title = "Higher power density amplifiers",
abstract = "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.",
author = "Iversen, {Niels E.} and Dahl, {Nicolai J.} and Arnold Knott and Andersen, {Michael A.E.}",
year = "2018",
doi = "10.17743/jaes.2018.0064",
language = "English",
volume = "66",
pages = "1051--1061",
journal = "A E S",
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}

Higher power density amplifiers. / Iversen, Niels E.; Dahl, Nicolai J.; Knott, Arnold; Andersen, Michael A.E.

In: AES: Journal of the Audio Engineering Society, Vol. 66, No. 12, 2018, p. 1051-1061.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Higher power density amplifiers

AU - Iversen, Niels E.

AU - Dahl, Nicolai J.

AU - Knott, Arnold

AU - Andersen, Michael A.E.

PY - 2018

Y1 - 2018

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AB - 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.

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DO - 10.17743/jaes.2018.0064

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