Realization of digital audio amplifier using zero-voltage-switched PWM power converter

Wing-Hong Lau; Henry Shu-Hung Chung; C. M. WuFranki N. K. Poon

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Realization of digital audio amplifier using zero-voltage-switched PWM power converter

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摘要

This paper presents a simple methodology to convert a hard-switched pulse-width-modulated (PWM) H-bridge converter used in a classical digital audio amplifier into a zero-voltage-switching (ZVS) converter. The ZVS is simply achieved by connecting an L-C series branch across the converter output. ZVS occurs during the dead time interval of the PWM signals, giving an effective improvement in the conversion efficiency, output frequency spectrum, and total harmonic distortion. A simplified design procedure is provided for choosing the value of the components. A prototype digital amplifier with an output power of 20 W and switching frequency of 705.6 kHz has been implemented. Experimental results are presented and favorably verified with theoretical predictions.

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来源
《IEEE Transactions on Automatic Control》 |2000年第3期|303-311|共9页
作者
Wing-Hong Lau; Henry Shu-Hung Chung; C. M. WuFranki N. K. Poon;
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原文格式 PDF
正文语种英语
中图分类自动化系统;
关键词
Pulse-width-modulated converter; Total harmonic distortion; Zero-voltage-switching;

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Realization of digital audio amplifier using zero-voltage-switched PWM power converter

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