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

Volume

4

fYear

2001

Firstpage

2167

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE

Conference_Location

Chicago, IL, USA

ISSN

0197-2618

Print_ISBN

0-7803-7114-3

Type

conf

DOI

10.1109/IAS.2001.955926

Filename

955926