• 한국ITS학회 논문지
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• 제19권3호
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• pp.137-147
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• 2020

본 논문에서는 5G 이동통신 주파수 대역에서 자동차 전장품 전자기파 내성 평가를 위한 3 ~ 5 GHz 광대역 특성의 인쇄형 bow-tie 안테나를 제안하였다. 제안된 안테나는 2.75 ~ 6 GHz 주파수 대역에서 -10 dB 대역폭을 만족하였고, 공진 주파수 대역에서 S₁₁ 특성이 -16.2 dB 이하의 특성을 보이면서 방사 패턴은 broadside한 형태를 얻었다. 또한, 실제 5G 이동통신 주파수 대역에서의 전자기파 내성 평가를 수행함에 있어서도, 국제 표준에서 규제하는 VSWR 특성이 2.1 이하의 특성을 유지하면서도 기준 레벨인 1 W의 레벨을 문제없이 형성하였다. 이러한 결과를 통하여, 제안된 안테나는 5G 이동통신 주파수 대역에서 전자기파 내성 검증을 위한 평가용 안테나로 적용할 수 있음을 확인하였다.

• 한국전자파학회논문지
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• 제27권10호
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• pp.917-925
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• 2016

슈미트 트리거 로직(Schmitt Trigger Logic)은 디지털 회로의 노이즈에 대한 내성을 향상시키기 위해 히스테리시스 특성을 보이는 게이트를 제안한 설계 방법이다. 슈미트 트리거 특성을 보이는 설계 방법 중 최근에 제안된 substrate bias를 조정하여 구현하는 Dynamic Threshold voltage MOS(DTMOS) 방법을 사용할 경우, 게이트 수를 늘이지 않고 내성을 향상 시킬 수 있는 설계방법이나, 범용 CMOS 공정에서 구현하여 시뮬레이션으로 예상하는 성능을 얻을 수 있는지는 검증되지 않았다. 본 연구에서는 $0.18{\mu}m$ CMOS 공정에서 DTMOS 설계 방법을 구현하여 히스테리시스 특성을 측정하여 검증하였다. DTMOS 슈미트 트리거 버퍼, 인버터, 낸드, 노어 게이트 및 간단한 디지털 로직 회로를 제작하였으며, 히스테리시스 특성, 전력 소모, 딜레이 등의 특성들을 관찰하고, 일반적인 CMOS 게이트로 구현된 회로와 비교하였다. 노이즈에 대한 내성이 향상되는 것을 Direct Power Injection(DPI) 실험을 통해 확인하였다. 본 논문을 통해 제작된 DTMOS 슈미트 트리거 로직은 10 M~1 GHz 영역에서 전자파 내성이 향상된 것을 확인할 수 있었다.

• 한국전자파학회지:전자파기술
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• 제14권1호
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• pp.35-42
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• 2003

Differential signaling has become a popular choice for high-speed interconnection schemes on Printed Circuit Boards (PCBs), offering superior immunity to external noise. However, conventional differential transmission lines on PCBs have problems, such as crosstalk and radiated emission. To overcome these, we propose a Twisted Differential Line (TDL) structure on a multi-layer PCB. Its improved immunity to crosstalk noise and the reduced radiated emission has been successfully demonstrated by measurement. The proposed structure is proven to transmit 3 Gbps digital signals with a clear eye-pattern. Furthermore, it is subject to much less crosstalk noise and achieves a 13 dB suppression of radiated emission. Index Terms - Twisted Differential Line, Differential Signaling, Crosstalk, Radiated Emission, Transmission Line, Twisted Pair

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.418-421
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• 2002

The immunity testing in this study was performed to examine the conducted immunity and radiated immunity in medical instrumentation. Experiments were performed to assess the conducted emission and radiated emission of medical instrumentation such as MRI, ultrasound system, and electro surgical unit etc. The emission testing revolves around conducted emissions (high-frequency currents) on power lines and signal cables. Emission testing also looks at the output of energy through the air (called radiated emissions) and analyzes the strength of those radio-frequency signals generated unintentionally by the electrical medical device that is under test. Finally, this study would provide significant data for furture research or electromagnetic interference and compatibility test in medical instrumentation.

• Journal of electromagnetic engineering and science
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• 제8권4호
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• pp.153-157
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• 2008

Most of malfunctions in electronic equipment or systems controlled by processors is occurred by the differential- and common-mode noises, and the electrical fast transient (EFT). The International Electrotechnical Commission (IEC) has prepared the dummy signal to test the immunity level of the equipment. For the countermeasure against the differential- and common-mode noises, and the EFT, we designed, fabricated, and tested a new electromagnetic compatibility (EMC) filter, which is composed of feed-through capacitors and ferrite beads with high permeability. As a result, the filter showed excellent differential- and common-mode noises filtering, and immunity improving characteristics over the frequency band from 30 MHz to 1.5 GHz and 1.8 GHz, respectively.

• 한국전자파학회논문지
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• 제16권6호
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• pp.622-631
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• 2005

본 논문에서는 전자파 방사 내성 시험의 불확실성 요인이 되는 '오버 및 언더 편차'와 그로 인해 발생하는 '오버 및 언더 테스팅'을 줄이고자 기존 균일장 측정 방법의 문제점을 비교 분석하고 '오버 및 언더 편차'를 최소화할 수 있는 새로운 균일장 측정 방법을 제안하였다. 성능이 다른 4개의 국내 시험 기관 무반사실에 이를 적용하여 기존 측정 방법과 비교 실험하였으며 6 dB을 초과하는 필드에 대해 최소 편차인 FDI(Field Deviation Index)와 비교 분석하였다. 실험에 대한 분석 결과 '오버 및 언더 편차'는 제안 방법이 FDI와 동일하게 나타났으며 특정 주파수에선 현재 국내 규격 및 국제 규격보다 4.9 dB, 2.37 dB 개선되었고 전체 주파수에서는 평균적으로 1.193 dB, 0.017 dB 개선되었다. '오버 및 언더 테스팅 포인트'는 제안 방법이 기존 방법보다 최대 926개, 10개 포인트가 적게 측정되었으며 균일 영역 중심부 4포인트에서는 최대 118개, 9개 적게 측정되었으며, 다른 포인트에 대한 비율 또한 가장 낮게 측정되어 시험의 불확실성의 요인을 최소화하였음을 확인하였다.

• Journal of electromagnetic engineering and science
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• 제13권4호
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• pp.233-239
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• 2013

This paper proposes an accurate approach for predicting transferred power from a noise source to integrated circuits based on the characteristics of the power transfer network. A power delivery trace on a package and a printed circuit board are designed to transmit power from an external source to integrated circuits. The power is demonstrated between an injection terminal on the edge of the printed circuit board and integrated circuits, and the power transfer function of the power distribution network is derived. A two-tier calibration is applied to the test, and scattering parameters of the network are measured for the calculation of the power transfer function. After testing to obtain the indispensable parameters, the real received and tolerable power of the integrated circuits can be easily achieved. Our proposed estimation method is an enhancement of the existing the International Electrotechnical Commission standard for precise prediction of the electromagnetic immunity of integrated circuits.

• 전력전자학회논문지
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• 제26권3호
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• pp.222-226
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• 2021

To comply with CE marking requirements, the electromagnetic compatibility (EMC) and low-voltage directive (LVD) tests are conducted on the sub-racks of International Thermonuclear Experimental Reactor (ITER) AC/DC converters and bypass switches. The EMC tests consist of a series of tests, including the electromagnetic interference test, the electromagnetic field immunity test, and the rapid transient burst immunity test. In the LVD test, the electric shock protection test, the xcessive temperature limit and heat resistance of equipment tests, and the fire spread prevention test are performed. This work presents and reviews the European Directive for EMC/LVD and introduces the methods of EMC and LVD tests for the sub-racks of AC/DC converters and bypass switches. It also evaluates the test method and results to meet the European Directive requirements for CE marking. The sub-racks of ITER AC/DC converters and bypass switches successfully pass the EMC and LVD tests.

• 전기학회논문지
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• 제60권6호
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• pp.1261-1267
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• 2011

Electricity meters using in Korea are about 1.8 million units. From among these, electronic meters for high voltage, about 170 thousand units were installed to the digital type meter and ones for low voltage installed hundreds of thou-sands of meters through a model project. Recently, low voltage meter are expected to complete the installation within several years. Domestic power metering technology is being beyond a simple framework with an electronic type and is rapidly evolving to intelligent smart metering systems in conjunction with promotion of a national smart grid project. Accordingly, it is important to ensure an immunity of meter for electromagnetic field and environmental noise at the installation site. In this paper, we are going to check the validity of international standard that focusing on RF electromagnetic field immunity of meter to secure the quality and improve the reliability in field operation of meter. And we will verify the validity of test specification focused on actual installation environment and are going to offer the improvement plan of test standard.

• 한국항해학회지
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• 제19권3호
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• pp.29-34
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• 1995

IEC and CISPR have continuously endeavored the measurement method of Immunity Test as international unification, but not established yet. The main reason is that the measurement method and the normalization of threshold to obtain the complicated parameters for Immunity Test are difficult. Thus, the Immunity Test Setups are used differently according to the measured electromagnetic environments. This study developed an Immunity Test System and Algorithm for measurement software suitable for IEC801-3 Regulatons using ready-made amplifier, signal generator, and developes interconnecting interface board interacting with other appratus i.e., RF Switch, Power Meter, Field Sensor and Pre-amp. We are to develope an automated software using Top/Down and OOP(Object Oriented Programming) method.