Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

Martijn Duraij; Niels Elkjær Iversen; Lars Press Petersen; Patrik Boström

Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

Martijn Duraij
, Niels Elkjær Iversen
, Lars Press Petersen
, Patrik Boström

Bolecano Holding AB

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

This paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on the force factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and the measurements shows good consistency with FEA simulations. Measurements of the generated AC flux modulation shows, that eddy currents are the main source to magnetic losses in form of phase lag and amplitude changes. Use of a copper cap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations show that there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factor change.

Original language	English
Title of host publication	Proceedings of 139th International Audio Engineering Society (AES) Convention
Number of pages	10
Publisher	Audio Engineering Society
Publication date	2015
Article number	9378
Publication status	Published - 2015
Event	139th International Audio Engineering Society (AES) Convention - The Jacob Javits Center, New York City, United States Duration: 29 Oct 2015 → 1 Nov 2015 http://www.aes.org/events/139/

Conference

Conference	139th International Audio Engineering Society (AES) Convention
Location	The Jacob Javits Center
Country/Territory	United States
City	New York City
Period	29/10/2015 → 01/11/2015
Internet address	http://www.aes.org/events/139/

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@inproceedings{e3bdaceabc2647ac8c2aac3982420930,

title = "Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs",

abstract = "This paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on the force factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and the measurements shows good consistency with FEA simulations. Measurements of the generated AC flux modulation shows, that eddy currents are the main source to magnetic losses in form of phase lag and amplitude changes. Use of a copper cap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations show that there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factor change.",

author = "Martijn Duraij and Iversen, \{Niels Elkj{\ae}r\} and Petersen, \{Lars Press\} and Patrik Bostr{\"o}m",

year = "2015",

language = "English",

booktitle = "Proceedings of 139th International Audio Engineering Society (AES) Convention",

publisher = "Audio Engineering Society",

note = "139th International Audio Engineering Society (AES) Convention ; Conference date: 29-10-2015 Through 01-11-2015",

url = "http://www.aes.org/events/139/",

}

Duraij, M, Iversen, NE, Petersen, LP & Boström, P 2015, Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs. in Proceedings of 139th International Audio Engineering Society (AES) Convention., 9378, Audio Engineering Society, 139th International Audio Engineering Society (AES) Convention, New York City, United States, 29/10/2015. <http://www.aes.org/elib/ browse.cfm?elib=17936>

Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs. / Duraij, Martijn; Iversen, Niels Elkjær; Petersen, Lars Press et al.
Proceedings of 139th International Audio Engineering Society (AES) Convention. Audio Engineering Society, 2015. 9378.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

AU - Duraij, Martijn

AU - Iversen, Niels Elkjær

AU - Petersen, Lars Press

AU - Boström, Patrik

PY - 2015

Y1 - 2015

N2 - This paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on the force factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and the measurements shows good consistency with FEA simulations. Measurements of the generated AC flux modulation shows, that eddy currents are the main source to magnetic losses in form of phase lag and amplitude changes. Use of a copper cap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations show that there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factor change.

AB - This paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on the force factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and the measurements shows good consistency with FEA simulations. Measurements of the generated AC flux modulation shows, that eddy currents are the main source to magnetic losses in form of phase lag and amplitude changes. Use of a copper cap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations show that there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factor change.

M3 - Article in proceedings

BT - Proceedings of 139th International Audio Engineering Society (AES) Convention

PB - Audio Engineering Society

T2 - 139th International Audio Engineering Society (AES) Convention

Y2 - 29 October 2015 through 1 November 2015

ER -

Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

Abstract

Conference

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