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

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...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. 1, Fundamental theory and applications Vol. 47; no. 3; pp. 303 - 311
Main Authors Wing-Hong Lau, Chung, H.S.-H., Wu, C.M., Poon, F.N.K.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2000
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Frequency conversion
Joining processes
Power amplifiers
Power generation
Prototypes
Pulse amplifiers
Pulse width modulation
Pulse width modulation converters
Total harmonic distortion
Zero voltage switching
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1057-7122
1558-1268
DOI:10.1109/81.841913