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

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

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-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 languageEnglish
Title of host publicationProceedings of 139th International Audio Engineering Society (AES) Convention
Number of pages10
PublisherAudio Engineering Society
Publication date2015
Article number9378
Publication statusPublished - 2015
Event139th International Audio Engineering Society (AES) Convention - The Jacob Javits Center, New York City, United States
Duration: 29 Oct 20151 Nov 2015
http://www.aes.org/events/139/

Conference

Conference139th International Audio Engineering Society (AES) Convention
LocationThe Jacob Javits Center
CountryUnited States
CityNew York City
Period29/10/201501/11/2015
Internet address

Cite this

Duraij, M., Iversen, N. E., Petersen, L. P., & 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.
Duraij, Martijn ; Iversen, Niels Elkjær ; Petersen, Lars Press ; Boström, Patrik. / Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs. Proceedings of 139th International Audio Engineering Society (AES) Convention. Audio Engineering Society, 2015.
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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",
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}

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.

Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs. / Duraij, Martijn; Iversen, Niels Elkjær; Petersen, Lars Press; Boström, Patrik.

Proceedings of 139th International Audio Engineering Society (AES) Convention. Audio Engineering Society, 2015. 9378.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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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.

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

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Duraij M, Iversen NE, Petersen LP, Boström P. Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs. In Proceedings of 139th International Audio Engineering Society (AES) Convention. Audio Engineering Society. 2015. 9378