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EMI Reduction by Spread-Spectrum Clocking in Digitally-Controlled DC-DC Converters

Ibuki MORI, Yoshihisa YAMADA, Santhos A. WIBOWO, Masashi KONO, Haruo KOBAYASHI, Yukihiro FUJIMURA, Nobukazu TAKAI, Toshio SUGIYAMA, Isao FUKAI, Norihisa ONISHI, Ichiro TAKEDA, Jun-ichi MATSUDA

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Summary :

This paper proposes spread-spectrum clock modulation algorithms for EMI reduction in digitally-controlled DC-DC converters. In switching regulators using PWM, switching noise and harmonic noise concentrated in a narrow spectrum around the switching frequency can cause severe EMI. Spread-spectrum clock modulation can be used to minimize EMI. In conventional switching regulators using analog control it is very difficult to realize complex spread-spectrum clocking, however this paper shows that it is relatively easy to implement spread-spectrum EMI-reduction using digital control. The proposed algorithm was verified using a power converter simulator (SCAT).

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.4 pp.1004-1011
Publication Date
2009/04/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.1004
Type of Manuscript
Special Section PAPER (Special Section on Advanced Technologies Emerging Mainly from the 21st Workshop on Circuits and Systems in Karuizawa)
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