Details

Autor(en) / Beteiligte

• Paramesh, J.
• von Jouanne, A.

Titel

Use of sigma-delta modulation to control EMI from switch-mode power supplies

Ist Teil von

• IEEE transactions on industrial electronics (1982), 2001-02, Vol.48 (1), p.111-117

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2001

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Xplore

Beschreibungen/Notizen

• Conducted electromagnetic interference (EMI) is a major cause of concern in switch-mode power supplies (SMPSs) which commonly use standard pulsewidth modulation (PWM). In this paper, sigma-delta (/spl Sigma//spl Delta/) modulation is proposed as an alternative switching technique to reduce conducted EMI from an SMPS. The result of using /spl Sigma//spl Delta/ modulation is a spread in the spectrum of the conducted emissions so that large concentrations of power at discrete frequencies are avoided. Experimental time-domain waveforms and spectra of the switching function of first-order and second-order /spl Sigma//spl Delta/ modulators are presented to prove the viability of the scheme for EMI mitigation. These modulators are then applied to a DC-DC converter in an off-the-shelf computer power supply and experimental results show a reduction of roughly 5-10 dB/spl middot//spl mu/V in EMI emissions over standard PWM modulators.