• Title/Summary/Keyword: Electromagnetic interference(EMI)

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Compliance Technologies of Electromagnetic Compatibility in Automotive Electronic Systems (전장 시스템의 전자파 적합성 대응 기술)

  • Shin, Youngsan;Lee, Seongsoo
    • Journal of IKEEE
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    • v.22 no.2
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    • pp.506-509
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    • 2018
  • Recently, number of components and operation frequency rapidly increase in automotive systems. This often leads to EMI (electromagnetic interference) where automotive systems suffer from malfunctions induced by electromagnetic wave. This paper surveys various EMC (electromagnetic compatibility) compliance technologies such as EMI filter, EMI shielding materials, and spread spectrum clock generator. Their pros and cons are also explained.

Technical Trends of Flexible, Transparent Electromagnetic Interference Shielding Film (유연한 투명 전자기 간섭 차폐 필름의 기술개발 동향)

  • Lim, Hyun-Su;Oh, Jung-Min;Kim, Jong-Woong
    • Journal of the Microelectronics and Packaging Society
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    • v.28 no.1
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    • pp.21-29
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    • 2021
  • Recently, semiconductor chips and electronic components are increasingly being used in IT devices such as wearable watches, autonomous vehicles, and smart phones. As a result, there is a growing concern about device malfunctions that may occur due to electromagnetic interference being entangled with each other. In particular, electromagnetic wave emissions from wearable or flexible smart devices have detrimental effects on human health. Therefore, flexible and transparent electromagnetic interference (EMI) shielding materials and films with high optical transmittance and outstanding shielding effectiveness have been gaining more attention. The EMI shielding films for flexible and transparent electronic devices must exhibit high shielding effectiveness, high optical transmittance, high flexibility, ultrathin and excellent durability. Meanwhile, in order to prepare this EMI shielding films, many materials have been developed, and results regarding excellent EMI shielding performance of a new materials such as carbon nano tube (CNT), graphene, Ag nano wire and MXene have recently been reported. Thus, in this paper, we review the latest research results to EMI shielding films for flexible and transparent device using the new materials.

Effects of PCB Patterns on EMI Measurement in TEM Cell and Proposal of PCB Design Guidelines (TEM 셀에서 PCB 패턴이 EMI 측정에 미치는 영향 및 PCB 설계 가이드라인 제시)

  • Choi, Minkyoung;Shin, Youngsan;Lee, Seongsoo
    • Journal of IKEEE
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    • v.21 no.3
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    • pp.272-275
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    • 2017
  • Recently, semiconductor integration density enormously increases and its interconnection width is significantly narrowed, which leads to EMI (electromagnetic interference) problems on chip level. Chip manufacturer exploits TEM cell (transverse electromagnetic cell) to measure EMI on chip level, which requires PCB (printed circuit board) for measurement purpose. However, it is often neglected to consider that PCB patterns and other factors can affect on EMI measurement. In this paper, several test patterns are designed for different PCB design variables, and effects of PCB patterns on EMI measurement in TEM cell are analyzed. Based on these analyses, PCB design guidelines are also proposed to minimize the effects on EMI measurements.

추적레이다에 의한 인체에 대한 영향(HERP) 및 전자파 간섭(EMI) 분석

  • Kim, Dae-Oh;Sin, Han-Seop;Kim, Tae-Hyung;Lee, Hyo-Keun
    • Aerospace Engineering and Technology
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    • v.4 no.1
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    • pp.239-246
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    • 2005
  • This paper analyze the hazard of electromagnetic radiation to personnel (HERP) and electromagnetic interference (EMI) by C-band tracking radar. Especially, this analysis defines the safety distance for the controlled & uncontrolled personnel from high power radiation of electromagnetic wave within the main beam of 3 degrees by C-band tracking radar. In addition to HERP, the analysis of electromagnetic interference between tracking radar and weather radar was accomplished to decide the safety distance for EMI protection.

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Analysis of revised regulatory guidance on electromagnetic interference qualification for nuclear safety

  • In Beom Ahn;Jaeyul Choo ;Jae Yoon Park ;Hyunchul Ku ;Kyeong-Sik Min
    • Nuclear Engineering and Technology
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    • v.55 no.3
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    • pp.870-875
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    • 2023
  • In this paper, we analyzed the revised guidance on electromagnetic (EM) interference qualification of Regulatory Guide 1.180 (Revision 2), which is published by the U.S. Nuclear Regulatory Commission for electromagnetic compatibility qualification for nuclear safety, by comparing it with that of the previous version. We confirmed that the test methods and the acceptance criteria of both CE101 and CE102 tests for conductive emission and RE102 test for radiating emission are changed in the recently revised Regulatory Guide 1.180 (Revision 2). Furthermore, we found that the revised Regulatory Guide 1.180 provides flexibility in the use of alternative methods for EM interference (EMI) qualification, in that a mix of the various base-standards is technically allowed. In addition, the primary revision of the updated Regulatory. Guide 1.180 is that MIL-STD-461G is to be adopted as the latest base-standard, instead of MIL-STD-461E. To evaluate the influence on EMI qualification for nuclear safety due to the endorsement of MIL-STD-461G, we thoroughly analyzed the modifications in the acceptance criteria and test methods for EMI qualification, and then validated the analyzed effect on the EMI qualification, which is caused by the revision of MIL-STD-461, by performing electromagnetic simulation for equipment under RE102 test.

Development of the Hybrid EMI Filter for DC-DC Converter (DC-DC 전력변환장치용 Hybrid EMI 필터 개발)

  • Lee, Dong-Ho;Yoo, Jin-Wan;Park, Chong-Yeun
    • Journal of Industrial Technology
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    • v.34
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    • pp.71-78
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    • 2014
  • Recently, using the electronic devices was increased with semiconductor developments. So, the EMI(Electromagnetic interference) problem become to important issue for coexistence with each electronic devices. The EMI is caused by switching operation from the power switches as the FET and the transistor in power conversion devices. In this paper, the hybrid EMI filter that composed with active components and passive components was described. The EMI filter is applied to the 160 watts LED driver experimentally verify the performance. The hybrid EMI filter is compared with non-filter, only passive filter and only active filter. The proposed EMI filter attenuated CM noise more than traditional passive filter.

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EMI Characteristics and filter design of AC Drives for Home Appliances (가전기기용 교류 전동기 구동 시스템의 EMI 특성 및 필터 설계)

  • 정세교;신휘범
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.1
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    • pp.81-87
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    • 2004
  • This paper describes a design method of electromagnetic interference (EMI) filter for pulse-width modulation (PWM) inverter-fed AC drives used for home appliances such as washing machine and air conditioner. The generating and coupling mechanisms of the conducted EMI for AC drives are first investigated. The design procedure of the EMI filter based on the EMI separation principle is then presented. Experiments we carried out for the PWM inverter-fed induction motor drive system and it is shown that the results satisfy the EN55014 EMI regulation.

A Study on SAR Variation by Folding Angle and EMI Paint Distribution of Case for Mobile Handsets (휴대폰의 폴딩 각도와 휴대폰 케이스의 EMI 방지 도료 분포패턴에 따른 SAR 변화에 관한 연구)

  • 이규호;김창일;양운근
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.4
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    • pp.421-430
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    • 2003
  • In this paper, we propose a method to consider SAR(Specific Absorption Rate) at beginning stage of handsets development. First, simulation was carried out with changing folding angle from 150$^{\circ}$to 142$^{\circ}$. Simulation results show that SAR value is decreased with decreasing the folding angle. When folding angle is 142$^{\circ}$, error between simulation and measurement results is about 3.95 %. Second, we made some experiments with EMI (Electromagnetic Interference) paint, and its results show that different pattern of EMI paint have different SAR values. After removing EMI paint at the lower part of antenna feeding point, we got the decrease efficiency of 15.46 % for SAR value. When we applied zigzag painting pattern, we got the highest SAR decrease efficiency.

Detection of electromagnetic interference shielding effect of Hanji mixed with carbon nanotubes using nuclear magnetic resonance techniques

  • Byun, Young Seok;Chae, Shin Ae;Park, Geun Yeong;Lee, Haeseong;Han, Oc Hee
    • Carbon letters
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    • v.27
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    • pp.90-97
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    • 2018
  • Electromagnetic interference (EMI) shielding is an important issue in modern daily life due to the increasing prevalence of electronic devices and their compact design. This study estimated EMI-shielding effect (EMI-SE) of small ($8-14{\times}17mm$) Hanji (Korean traditional paper) doped with carbon nanotubes (CNTs) and compared to Hanji without CNT using $^2H$ (92.1 MHz) and $^{23}Na$ (158.7 MHz) nuclear magnetic resonance (NMR) peak area data obtained from 1 M NaCl in $D_2O$ samples in capillary tubes that were wrapped in the Hanji samples. The simpler method of using the variation of reflected power and tuning frequency by inserting the sample into an NMR coil was also tested at 242.9, 158.7, and 92.1 MHz. Overall, EMI shielding was relatively more effective at the higher frequencies. Our results validated that NMR methods to be useful to evaluate EMI-SE, particularly for small, flexible shielding materials, and demonstrated that EMI shielding by absorption is dominant in Hanji mixed with CNT.

Electromagnetic Interference Shielding Effectiveness of Hybrid Conductive Fabrics (하이브리드 전도성 직조섬유의 전자파 차폐효과)

  • Han, Gil-Young;Kim, Ki-Yeol;Yun, Tae-Soon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.81-86
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    • 2015
  • This study investigated electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid conductive fabrics. The coaxial transmission line method was used to measure the EMI Shielding effectiveness of the conductive fabrics. We designed and constructed a measuring system, consisting of a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The measurements of SE were carried out in a frequency range from 100 MHz to 2 GHz. The results of the EMI shielding experiments showed that the maximum electromagnetic shielding effectiveness (EMSE) values of sandwich type C/A/C (carbon fiber sheet/aluminum foil tape/carbon fiber sheet) and C/Ni/C (carbon fiber sheet/magnetic shielding foil/carbon fiber sheet) samples were 55 dB and 113 dB, respectively, at a frequency of 1.9 GHz.