A Study on Design and Fabrication of Broad-Band EMC Filter for PC

Kim, Dong-Il; Jung, Sang-Wook; Kim, Min-Jung; Jeon, Joong-Sung

Journal of Navigation and Port Research 2004;28(8):715-719.
Published online October 31, 2004.

PC용 광대역 EMC 필터의 설계 및 제작에 관한 연구

김동일, 정상욱, 김민정, 전중성

A Study on Design and Fabrication of Broad-Band EMC Filter for PC

Dong-Il Kim, Sang-Wook Jung, Min-Jung Kim, Joong-Sung Jeon

Abstract

This paper deals with EMC filter for a personal computer(PC). A PC contains many sources of noise inside and out, with many connected cables. High noise levels are also emitted from the PC because of high-speed signals. So radiated noise from the computer body may sometimes cause problems. Therefore, we design and fabricate an electromagnetic compatibility (EMC) filter for PC, which is composed of feed-through capacitors and ferrite beads with high permeability. Through extensive test, the proposed EMC filter is shown to have excellent differential-mode and common-mode noises filtering characteristics above 30 ㏈ in the frequency band from 10 ㎒ to 1.5 ㎓. The immunity characteristics are improved more than 10 to 30 ㏈ over the frequency band from DC to 1.8 ㎓.

Key Words: PC;RMC;Feed-Through Capacitors;Ferrite Beads