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Conference paper

Derivation and Analysis of a Low-Cost, High-performance Analogue BPCM Control Scheme for Class-D Audio Power Amplifiers

In Aes 27th Conference "efficient Audio Power Amplification" — 2005

By Høyerby, Mikkel Christian Wendelboe1,2; Andersen, Michael A. E.2,3

From

Automation, Department of Electrical Engineering, Technical University of Denmark1

Department of Electrical Engineering, Technical University of Denmark2

Electronics, Department of Electrical Engineering, Technical University of Denmark3

This paper presents a low-cost analogue control scheme for class-D audio power amplifiers. The scheme is based around bandpass current-mode (BPCM) control, and provides ample stability margins and low distortion over a wide range of operating conditions. Implementation is very simple and does not require the use of operational amplifiers.

Small-signal behavior of the controller is accurately predicted, and design is carried out using standard transfer function based linear control methodology. Effectiveness of the approach is demonstrated via a 60W/8Ω single-ended switching amplifier with THD+N of typically 0.02%.

Language: English
Year: 2005
Proceedings: AES 27th Conference "Efficient Audio Power Amplification"
Types: Conference paper
ORCIDs: Andersen, Michael A. E.

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