Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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EMI reduction of PWM converter By Binary Switching Frequency Modulation

2진 스위칭 주파수 변조에 의한 PWM 컨버터의 EMI 저감

  • Jin, In-Su (Dept. Electrical Engineering, Chungnam National University) ;
  • Park, Seok-Ha (Dept. Electrical Engineering, Chungnam National University) ;
  • Yang, Kyeong-Rok (Dept. Electrical Engineering, Chungnam National University) ;
  • Kim, Yang-Mo (Dept. Electrical Engineering, Chungnam National University)
  • 진인수 (충남대학교 전기공학과) ;
  • 박석하 (충남대학교 전기공학과) ;
  • 양경록 (충남대학교 전기공학과) ;
  • 김양모 (충남대학교 전기공학과)
  • Published : 1999.07.19
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Abstract

To satisfy the demand for small size, light weight. high density power supply, the switching frequency of DC/DC converters has been increased. The PWM control of the conventional SMPS have a switching frequency that a level of the conducted noise spectra contribute to switching frequency band. So the electronic equipment is not only affected from that but is restricted to internal regulation like CISPR, FCC, and VDE. In this paper, we analyzed Bi-FM. Bi-FM is two fixed switching frequency with a modulation frequency. So emission spectrum of Bi-FM control signal is spreaded and spectral power level is reduced. In this paper, we analyze the spectral analysis of Bi-FM control signal and the spectral comparison between the PWM control and Bi-FM control. And we confirm that reduced the spectrum power level through simulation using Pspice and experiment.

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