Power Parameters and Efficiency of Class B Audio Amplifiers in Real-World Scenario
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Date
2017-04
Authors
Zhivomirov, Hristo
Kostov, Nikolay
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Referee
Mark
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Volume Title
Publisher
Společnost pro radioelektronické inženýrství
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Abstract
Consumer audio amplifiers are intended to op¬erate with various loudspeaker loads, i.e. the load imped¬ance profile of the audio amplifier is a priori unknown. We propose the power parameters analysis of the class B audio amplifiers to be carried out in the realistic worst-case (RWC) scenario of operation with the minimal value of the impedance and a RWC type of signal, instead of the nominal impedance of the loudspeaker and a sine-wave signal. Experimental validation, carried out for different types of signals and loudspeaker loads, demonstrate the advantages of the proposed RWC-based power parameters estimation. Furthermore, we provide a way of assessing the safe-operating area (SOA) boundaries, based on the output I-V loci of the amplifier and by means of an equi¬valent load line (ELL).
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Citation
Radioengineering. 2017 vol. 26, č. 1, s. 258-262. ISSN 1210-2512
http://www.radioeng.cz/fulltexts/2017/17_01_0258_0262.pdf
http://www.radioeng.cz/fulltexts/2017/17_01_0258_0262.pdf
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Peer-reviewed
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en