Title :
Design and analysis of digital audio amplifier using ZVS PWM converter
Author :
Lau, W.H. ; Chung, Henry S H ; Wu, C.M. ; Poon, N.K.
Author_Institution :
Dept. of Electron. Eng., Hong Kong Polytech., Kowloon, Hong Kong
Abstract :
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
Keywords :
PWM power convertors; audio-frequency amplifiers; bridge circuits; harmonic distortion; switching circuits; 20 W; 705.6 kHz; H-bridge converter; L-C series branch; ZVS PWM converter; conversion efficiency; dead time interval; design procedures; digital audio amplifier; output frequency spectrum; output power; switching frequency; total harmonic distortion; Frequency conversion; Joining processes; Power generation; Prototypes; Pulse amplifiers; Pulse width modulation; Pulse width modulation converters; Switching frequency; Total harmonic distortion; Zero voltage switching;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.777549
