Towards higher power density amplifiers

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

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Towards higher power density amplifiers. / Iversen, Niels Elkjær; Dahl, Nicolai Jerram; Knott, Arnold; Andersen, Michael A. E.

In: Journal of Audio Engineering Society, Vol. 66, No. 12, 2019.

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

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@article{7c353f3b92b04b5689d38b8e3fca6040,
title = "Towards 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 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.",
author = "Iversen, {Niels Elkj{\ae}r} and Dahl, {Nicolai Jerram} and Arnold Knott and Andersen, {Michael A. E.}",
year = "2019",
language = "English",
volume = "66",
journal = "A E S",
issn = "1549-4950",
publisher = "Audio Engineering Society",
number = "12",

}

RIS

TY - JOUR

T1 - Towards higher power density amplifiers

AU - Iversen, Niels Elkjær

AU - Dahl, Nicolai Jerram

AU - Knott, Arnold

AU - Andersen, Michael A. E.

PY - 2019

Y1 - 2019

N2 - 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.

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 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.

M3 - Journal article

VL - 66

JO - A E S

JF - A E S

SN - 1549-4950

IS - 12

ER -