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Conference paper

Active Electromagnetic Interference Cancelation for Automotive Switch-Mode Audio Power Amplifiers

In Proceedings of the Aes 36th International Conference — 2009

By Knott, Arnold1,2; Pfaffinger, Gerhard3; Andersen, Michael A. E.1,2

From

Electronics, Department of Electrical Engineering, Technical University of Denmark1

Department of Electrical Engineering, Technical University of Denmark2

Harman/Becker Automotive Systems GmbH3

Recent trends in the automotive audio industry have shown the importance of active noise cancelation (ANC) for major improvements in mobile entertainment environments. These approaches target the acoustical noise in the cabin and superimpose an inverse noise signal to cancel disturbances. Electromagnetic interference between switch-mode audio power amplifiers and receivers show the same physical obstacle as the described ANC endeavors are targeting.

The principle of active electromagnetic interference cancelation (AEC) is derived in this paper on a theoretical basis with verifications in simulation and experiment. The resulting switch-mode audio power amplifier of this experiment keeps its high efficiency and is able to deliver the signal with less than 0.1 % distortion, while improving the source of electromagnetic interference by 15 dB.

Language: English
Publisher: AES
Year: 2009
Proceedings: AES 36th International Conference
Journal subtitle: Automotive Audio - Sound in Motion
ISBN: 0937803693 and 9780937803691
Types: Conference paper
ORCIDs: Knott, Arnold and Andersen, Michael A. E.

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