Title :
Suppression of harmonic spikes in switching converter output using dithered sigma-delta modulation
Author :
Bae, Chang Han ; Ryu, Joon Hyoung ; Lee, Kwang Won
Author_Institution :
Div. of Electron. Eng., Ajou Univ., Suwon, South Korea
Abstract :
In this paper, dithered sigma-delta modulation (DSDM) is proposed as an effective modulation scheme for the switching converter, to suppress harmonic spikes. The proposed scheme has a simple configuration, which comprises a 1/sup st/-order sigma-delta modulator and a random dither generator. The 1/sup st/-order sigma-delta modulator produces a switching pulse waveform that has the same low-frequency component as the reference input, while the random dither spreads the distribution of sampling numbers per switching cycle, and thus diminishes harmonic spikes in the output. The relationship between the harmonic spectra and sampling numbers per switching cycle is studied through computer simulations, and performances are confirmed in an experimental setup.
Keywords :
circuit simulation; harmonics suppression; power conversion harmonics; power convertors; random number generation; sigma-delta modulation; switching circuits; 1/sup st/-order sigma-delta modulator; dithered sigma-delta modulation; harmonic spectra; harmonic spikes suppression; low-frequency component; random dither generator; switching converter output; switching cycle sampling numbers distribution; switching pulse waveform; Acoustic noise; Acoustic pulses; Computer simulation; Delta-sigma modulation; Pulse modulation; Pulse width modulation; Random number generation; Sampling methods; Switching converters; Switching frequency;
Conference_Titel :
Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-7114-3
DOI :
10.1109/IAS.2001.955926
