Title :
Suppression of harmonic spikes in asynchronous sigma delta modulation by randomizing hysteresis window
Author :
Aurasopon, A. ; Kumhom, P. ; Chamnongthai, K.
Author_Institution :
Dept. of Electron. & Telecommun. Eng., King Mongkut´´s Univ. of Technol., Bangkok, Thailand
Abstract :
This paper proposes to suppress the harmonic spikes in asynchronous sigma delta modulation by randomizing the hysteresis window for the distribution of the switching frequency and harmonic spectrum. The proposed scheme was examined in the dc/dc buck converter. The experimental results show that the proposed technique provides improved performance in terms of low peaks of harmonic while maintaining low output voltage ripple.
Keywords :
DC-DC power convertors; asynchronous circuits; harmonics suppression; hysteresis; sigma-delta modulation; asynchronous sigma delta modulation; dc-dc buck converter; harmonic spectrum; harmonic spikes suppression; hysteresis window; low harmonic peaks; switching frequency; voltage ripple; Delta-sigma modulation; Electromagnetic interference; Frequency modulation; Hysteresis; Power harmonic filters; Pulse width modulation; Space vector pulse width modulation; Switching frequency; Variable speed drives; Voltage;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1329971
