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 :
Dept. of Electron. Eng., Ajou Univ., Suwon, South Korea
Abstract :
In this paper, dithered sigma-delta modulation is proposed as an effective modulation scheme for a switching converter, to suppress harmonic spikes. The proposed scheme has a simple configuration, which comprises a first-order sigma-delta modulator and a random dither generator. The first-order sigma-delta, modulator produces a switching pulse waveform that has the same low-frequency component as the reference input. Also, the random dither disperses the switching frequency of output pulse waveform, which results in reduction of harmonic spikes. The relationship between the harmonic spectra and sampling numbers per switching cycle is studied through computer simulations, and performance is confirmed in an experimental setup
Keywords :
harmonic distortion; harmonics suppression; power conversion harmonics; sigma-delta modulation; switching circuits; computer simulations; dithered sigma-delta modulation; first-order sigma-delta modulator; harmonic spectra; harmonic spikes suppression; low-frequency component; random dither generator; sampling numbers; switching frequency; switching power converter output; switching pulse waveform; Computer simulation; Delta-sigma modulation; Pulse modulation; Pulse width modulation; Random number generation; Sampling methods; Signal sampling; Space vector pulse width modulation; Switching converters; Switching frequency;
Journal_Title :
Industry Applications, IEEE Transactions on
