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

• MORI Ibuki

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• YAMADA Yoshihisa

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• WIBOWO Santhos A.

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• KONO Masashi

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• KOBAYASHI Haruo

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• FUJIMURA Yukihiro

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• TAKAI Nobukazu

  Department of Electronic Engineering, Graduate School of Engineering, Gunma University

• SUGIYAMA Toshio

  Toko, Inc.

• FUKAI Isao

  Toko, Inc.

• ONISHI Norihisa

  Toko, Inc.

• TAKEDA Ichiro

  Toko, Inc.

• MATSUDA Jun-ichi

  Toko, Inc.

Abstract

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).

Journal

• IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

  IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E92-A (4), 1004-1011, 2009

  The Institute of Electronics, Information and Communication Engineers

Keywords

• PWM control
• spread-spectrum clock modulation
• EMI
• digitally-controlled DC-DC converter

Details

• CRID: 1390001206310382336
• NII Article ID: 10026856887
• NII Book ID: AA10826239
• DOI: 10.1587/transfun.e92.a.1004
• ISSN: 17451337
• ISSN: 09168508
• Web Site: http://www.jstage.jst.go.jp/article/transfun/E92.A/4/E92.A_4_1004/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed