Design and Analysis of Digital Audio Amplifier Using ZVS PWM Converter

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)218-221
Journal / PublicationProceedings - IEEE International Symposium on Circuits and Systems
Publication statusPublished - 1999


Title1999 IEEE International Symposium on Circuits and Systems (ISCAS '99)
LocationRenaissance Orlando Resort
PlaceUnited States
Period30 May - 2 June 1999


This paper presents a simple methodology to convert a hard-switched pulse-width-modulated (PWM) H-bridge converter used in classical digital audio amplifiers into a zero-voltage-switching (ZVS) converter. 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 (THD). Simplified design procedures are given for choosing the value of the components. A prototype having output power of 20 W and with switching frequency of 705.6 kHz has been built and the experimental results are presented.