The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Evaluation of Y-Cap Capacitance in EMI Filter Design Using Measured S-Parameter

측정된 S-파라메터를 이용한 EMI 필터의 Y-캡 용량 산정에 대한 연구

  • Kim, Jonghyeon (Department of Electronic and Computer Engineering, Sungkyunkwan University) ;
  • Jeon, Jiwoon (Department of Electronic and Computer Engineering, Sungkyunkwan University) ;
  • Kim, Taeho (Department of Electronic and Computer Engineering, Sungkyunkwan University) ;
  • Kim, Sungjun (Department of Electronic and Computer Engineering, Sungkyunkwan University) ;
  • Nah, Wansoo (Department of Electronic and Computer Engineering, Sungkyunkwan University)
  • 김종현 (성균관대학교 전자전기컴퓨터공학과) ;
  • 전지운 (성균관대학교 전자전기컴퓨터공학과) ;
  • 김태호 (성균관대학교 전자전기컴퓨터공학과) ;
  • 김성준 (성균관대학교 전자전기컴퓨터공학과) ;
  • 나완수 (성균관대학교 전자전기컴퓨터공학과)
  • Received : 2013.12.06
  • Accepted : 2014.03.14
  • Published : 2014.03.31
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Abstract

Insertion loss is used as the character to express the efficiency of EMI filter. In this paper, we studied the better method that can measure the insertion loss of EMI filter exactly than the original method. For the achievement of this, the method measuring both common mode(CM) and differential mode(DM) insertion loss with arbitrary input/output impedance is accomplished using a 4-ports S-parameters system for consideration of unbalanced factor. Using this method, when input/output used in specific system is known, CM/DM insertion loss of EMI filter inserted in the system can be calculated. Finally, we applied 4-ports modeling method to 'X/Y capacitor part' and suggested the algorithm for selecting suitable the value of Y-capacitor using mixed mode S-parameters and mixed mode chain S-parameters.

삽입 손실은 EMI 필터의 노이즈 제거 성능을 나타내는 주된 지표로 쓰인다. 본 논문에서는 기존의 방법보다 좀 더 정확하고 편하게 삽입 손실을 측정할 수 있는 방법에 대하여 연구하였다. 이와 관련하여 EMI 필터의 비이상적인 특성들을 모두 고려하기 위해 4포트 S-파라메터 측정을 통한 임의의 전원/부하 임피던스에 대한 차동 모드와 공통 모드의 삽입 손실을 구하는 방법에 대하여 제시하였다. 이를 활용하여 EMI 필터가 사용될 회로의 전원/부하 임피던스를 알고 있을 때, 시스템에 적용된 EMI 필터의 차동 모드 삽입 손실과 공통 모드 삽입 손실를 구할 수 있다. 또한, 이를 바탕으로 적절한 소자 값을 선택하기 위해 혼합 모드 변환, 체인 혼합 모드 변환 그리고 4포트 모델링을 통하여 임의의 소자 값에 따른 전체 시스템의 삽입 손실을 예측하는 방법에 대하여 제시하였다.

Keywords

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