Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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The Reduction Method for Radiated EMI in USB Power Line of Cable

USB 케이블의 전원선 에서의 방사성 EMI 개선

  • Park, Kyoung-Jin (Department of Electronic Engineering, Kangwoon University) ;
  • Lee, Dae-Woo (Department of Electronic Engineering, Kangwoon University) ;
  • Ko, Yong-Mok (Department of Electronic Engineering, Kangwoon University) ;
  • Gang, Eun-Gyun (Department of Electronic Engineering, yuhan collage) ;
  • Park, Jong-Hyun (Department of Electronic Engineering, Kangwoon University) ;
  • Kim, Keun-Yong (Department of Electronic Engineering, Kangwoon University) ;
  • Ra, Keuk-Whan (Department of Electronic Engineering, Kangwoon University)
  • Received : 2013.06.12
  • Published : 2013.09.25
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Abstract

In this paper, we studied on improvement for radiated EMI of USB power line of cable. it is made by using wireless video access point system for confirming the phenomenon of radiated EMI from cable. then, we make sure that the limit exceed through the initial measurement of radiated EMI limit criteria in comparison to about 3 [dBuV/m]~15 [dBuV/m]. after that we confirmed the resonance in power line of cable through measurement of s-parameters. so, we confirmed the relation radiated EMI and power line of cable resonance and we reduced radiated EMI in power line of cable through a capacitor and low pass-band filter using the technique of power networks management. in conclusion, we suggested how to reduce power line of cable resonance applied for the improved method. and we confirmed that suggested reduction method is suitable through testing radiated EMI. the result of radiated EMI reduction limit criteria 40[dBuV/m]~47[dBuV/m] in comparison to about 3 [dBuV/m]~20 [dBuV/m].

본 논문에서는 USB(Universal Serial Bus) 케이블 전원선에서의 방사성 EMI(Electro-Magnetci Interference) 개선 방안을 제시한다. 케이블 전원선에서의 EMI 방사현상을 확인하기 위해 무선 비디오 액세스 시스템을 이용하여, 방사성 EMI 결과를 분석하고 초기 측정 결과 규제치 대비 약 3 [dBuV/m]~15 [dBuV/m]를 초과함을 확인한다. 방사성 EMI 원인 분석을 위해, 먼저 USB 케이블 전원선에서의 S-파라미터 측정을 수행하여 케이블의 고주파수 대역에서의 규칙적인 공진현상과 방사성 EMI 주파수의 연관성을 분석한다. 그리고, 전원 회로 임피던스 관리 기법을 응용하여 캐패시터의 개수 선정, 비드를 이용한 저역통과 대역 필터를 구성을 통해 케이블 전원선의 공진현상을 저감하는 개선방법을 적용한다. 결론적으로 개선된 회로를 시스템에 적용하여 케이블의 규칙적 공진의 저감방법을 제시하여, 방사성 EMI 테스트 결과 규제치 대비 약 3 [dBuV/m]~20 [dBuV/m] 마진의 마진을 확보하여 제시한 방법의 적합성 확인한다.

Keywords

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