Volume 5 Number 4 (Aug. 2013)
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IJCEE 2013 Vol.5(4): 378-382 ISSN: 1793-8163
DOI: 10.7763/IJCEE.2013.V5.735

Dynamic Power-Loss Reduction for Over-Temperature Protection of Multilevel Class-D Amplifier

Bing-Shiun Hsieh and Chun-Wei Lin
Abstract—Class-D amplifier has been a popular device because of its high power efficiency. However, its ability of high power delivery also brings about over-temperature problem caused by consuming large power-loss over a long time. This paper therefore presents a control method to dynamically reduce the total power-loss of multilevel class-D amplifier according to the value of integrated temperature sensor. The driving (static) power-loss is reduced by limiting the driving current which can be achieved by reducing the output levels of the amplifier. In addition, the switching (dynamic) power-loss is diminished by segmenting the power transistors and gate drivers and selectively enabling parts of them according to the power demand. Therefore, the total power-loss of the amplifier is well controlled and reduced in order to prevent over-heating itself. Under the protection scheme, experimental results show that the total power-loss (excessive heat) and corresponding temperature difference on package can be reduced to only 15% of maximum value which demonstrates the effectiveness of proposed scheme.

Index Terms—Over-temperature protection, power-loss control, multilevel technique, class-D amplifier, PWM.

B. S. Hsieh is with the Graduate School of Engineering Science and Technology, National Yunlin University of Science & Technology (NYUST), Yunlin 640, Taiwan, R.O.C. (e-mail: g9610810@yuntech.edu.tw).
C. W. Lin is with the Department of Electronic Engineering, National Yunlin University of Science & Technology (NYUST), Yunlin 640, Taiwan, R.O.C. (e-mail: linwei@yuntech.edu.tw).

 

Cite:Bing-Shiun Hsieh and Chun-Wei Lin, "Dynamic Power-Loss Reduction for Over-Temperature Protection of Multilevel Class-D Amplifier," International Journal of Computer and Electrical Engineering vol. 5, no. 4, pp. 378-382, 2013.

General Information

ISSN: 1793-8163
Frequency: Semiyearly
Editor-in-Chief: Prof. Yucong Duan
Abstracting/ Indexing: EI (INSPEC, IET), Ulrich's Periodicals Directory, Google Scholar, EBSCO, Engineering & Technology Digital Library, ProQuest, and Electronic Journals Library
E-mail: ijcee@iap.org

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