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Development of a Surge Protective Device for Computer Network to International Standards  

Park Dae-won (한국해양대학교 전기전자공학부)
Song Jae-yong (한국해양대학교 전기전자공학부)
Han Joo-sup (한국해양대학교 전기전자공학부)
Kil Gyung-suk (한국해양대학교 전기전자공학부)
Abstract
This paper dealt with the development of surge protection devices (SPDs) that can protect high speed computer network devices from overvoltages caused by switching operations or lightning surges. The designed SPD is a form of hybrid circuit which is composed of a gas tube having large current diverting capability, high response bi-directional avalanche diodes, and fast recovery diodes to reduce insertion loss on high frequency domain. Surge protection and signal transmission characteristics of the fabricated SPD was tested according to the international standards, IEC 61000-4-5 and IEC 61643-21. From the test results, the SPD is satisfied with the international standards and the high cut-off frequency was 204 MHz. Also, the SPD showed a good performance without an insertion loss on a field test of 100 Mbps class Local Area Network.
Keywords
surge protection device; computer network; insertion loss; hybrid circuit; international standards;
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