Tracking Multi-Level Power Power Supply for Class-D Audio Amplifiers

Nicolai Jerram Dahl; Niels Elkjær Iversen; Vladan Lazarevic; Michael A. E. Andersen; Miroslav Vasic

doi:10.1109/JESTPE.2020.2980421

Tracking Multi-Level Power Power Supply for Class-D Audio Amplifiers

Nicolai Jerram Dahl, Niels Elkjær Iversen, Vladan Lazarevic, Michael A. E. Andersen, Miroslav Vasic

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Abstract

Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this paper proposes a Tracking Multi-Level Power Supply (TMLPS) in order to improve system efficiency. A simple prototype system is designed and tested up to 200W. Measured results show that employing a TMLPS can improve efficiency with a factor of 6 when playing music. In addition, the temperature rise of the amplifier is vastly reduced, especially for the switching power MOSFETs where it is halved from 100◦C to 50◦C. To further improve efficiency, an optimization method is proposed. The optimization considers the amplitude distribution of music signals and consumer behaviors. Simulations show that efficiency can be further improved by a factor of 1.23 with an optimized TMLPS
compared to a simple uniform TMLPS solution.

Original language	English
Journal	IEEE Journal of Emerging and Selected Topics in Power Electronics
Volume	9
Issue number	1
Pages (from-to)	156-166
ISSN	2168-6777
DOIs	https://doi.org/10.1109/JESTPE.2020.2980421
Publication status	Published - 2021

Keywords

Class-D
Tracking power supply
Optimization
Audio systems
Multilevel systems

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/JESTPE.2020.2980421

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title = "Tracking Multi-Level Power Power Supply for Class-D Audio Amplifiers",

abstract = "Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this paper proposes a Tracking Multi-Level Power Supply (TMLPS) in order to improve system efficiency. A simple prototype system is designed and tested up to 200W. Measured results show that employing a TMLPS can improve efficiency with a factor of 6 when playing music. In addition, the temperature rise of the amplifier is vastly reduced, especially for the switching power MOSFETs where it is halved from 100◦C to 50◦C. To further improve efficiency, an optimization method is proposed. The optimization considers the amplitude distribution of music signals and consumer behaviors. Simulations show that efficiency can be further improved by a factor of 1.23 with an optimized TMLPScompared to a simple uniform TMLPS solution.",

keywords = "Class-D, Tracking power supply, Optimization, Audio systems, Multilevel systems",

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AU - Dahl, Nicolai Jerram

AU - Iversen, Niels Elkjær

AU - Lazarevic, Vladan

AU - Andersen, Michael A. E.

AU - Vasic, Miroslav

PY - 2021

Y1 - 2021

N2 - Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this paper proposes a Tracking Multi-Level Power Supply (TMLPS) in order to improve system efficiency. A simple prototype system is designed and tested up to 200W. Measured results show that employing a TMLPS can improve efficiency with a factor of 6 when playing music. In addition, the temperature rise of the amplifier is vastly reduced, especially for the switching power MOSFETs where it is halved from 100◦C to 50◦C. To further improve efficiency, an optimization method is proposed. The optimization considers the amplitude distribution of music signals and consumer behaviors. Simulations show that efficiency can be further improved by a factor of 1.23 with an optimized TMLPScompared to a simple uniform TMLPS solution.

AB - Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this paper proposes a Tracking Multi-Level Power Supply (TMLPS) in order to improve system efficiency. A simple prototype system is designed and tested up to 200W. Measured results show that employing a TMLPS can improve efficiency with a factor of 6 when playing music. In addition, the temperature rise of the amplifier is vastly reduced, especially for the switching power MOSFETs where it is halved from 100◦C to 50◦C. To further improve efficiency, an optimization method is proposed. The optimization considers the amplitude distribution of music signals and consumer behaviors. Simulations show that efficiency can be further improved by a factor of 1.23 with an optimized TMLPScompared to a simple uniform TMLPS solution.

KW - Class-D

KW - Tracking power supply

KW - Optimization

KW - Audio systems

KW - Multilevel systems

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DO - 10.1109/JESTPE.2020.2980421

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Tracking Multi-Level Power Power Supply for Class-D Audio Amplifiers

Abstract

Keywords

UN SDGs

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