• 제목/요약/키워드: conducted EMI

검색결과 139건 처리시간 0.028초

노드확장에 따른 SMPS의 전도성 이미션 감소 (Conducted Emission Reduction of SMPS by Expanded Node)

  • 이희훈;배병현;김영삼;권영안
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.273-275
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    • 2003
  • SMPS는 신속한 스위칭에 의하여 높은 $d{\upsilon}$/dt 및 di/dt 특성을 가지며, 이러한 스위칭 특성으로 SMPS에서 발생하는 EMI 노이즈는 기기 내부 및 외부에 간섭을 일으킨다. 일반적으로 전자파 이미션은 전도성 이미션 및 방사성 이 미션으로 분류되며. 전도성 이미션은 공통모드와 차동모드로 구분한다. 최근 노이즈전류를 평형시킴으로써 공통모드 노이즈를 감소시키는 방법이 연구되었다. 이 방법은 공통모드 노이즈가 시스템 불평형의 결과라는 측면을 고려한 것이며. 노이즈 전류의 평형상태에서 컨버터를 동작시키면 공통모드 노이즈가 크게 줄어들 수 있음을 보여준다. 본 논문에서는 절연형 SMPS에서 노이즈 전류의 평형기법을 이용하여 SMPS의 1차 및 2차 측의 노드 확장에 따른 노이즈 감소를 분석한다.

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PWM 스위칭 기법에 의한 유도전동기 구동시스템의 전도노이즈 저감 (Conducted EMI reduction of Induction Motor Drive System by PWM switching technique)

  • 천광수;이원철;김이훈;김수석;원충연
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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    • pp.540-545
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    • 2004
  • Conventional SVPWM method has null switching vectors. Null switching vectors cause common-mode voltage making high in induction motor drive system. New SVPWM method without using null switching vectors are proposed in the paper. So, new SVPWM method reduces the common mode voltage for induction motor drive system. It is realized by changing software without adding hardware to induction motor drive system. Simulation results show that common-mode voltage adapting proposed method are reduced regarding conventional method.

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Random PWM 기법에 의한 전도노이즈 (Conducted Noise Reduction in Random Pulse Width Modulation)

  • 정동효;김상남
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 학술대회 논문집 전문대학교육위원
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    • pp.98-101
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    • 2002
  • The switching-mode power converter has been widely used because of its features of high efficiency and small weight and size. These features are brought by the ON-OFF operation of semiconductor switching devices. However, this switching operation causes the surge and EMI(Electromagnetic Interference) which deteriorate the reliability of the converter themselves and entire electronic systems. This problem on the surge and noise is one of the most serious difficulties in AC-to-DC converter. In the case of carrier frequency selection, output-voltage of steady state and transient state is fully regulated. A RPWM control method was proposed in order to smooth the switching noise spectrum and reduce it's level. Experimental results are verified by converter operating at 300V/1kW with 5%${\sim}$30% white noise input. Spectrum analysis is performed on the Phase current and the CM noise voltage. The former is measured with Current Probe and the latter is achieved with USN. which are connected to the spectrum analyzer respectively.

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자동차 실내 전자파의 협대역 특성에 관한 연구 (A Study on Narrowband Electromagnetic Interference in The Cabin of Vehicle)

  • 김민우;우현구
    • 자동차안전학회지
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    • 제8권2호
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    • pp.30-36
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    • 2016
  • According to revolutionary developments in automobile technologies, various electronically controlled components of vehicles are rapidly increasing. A variety of advanced vehicles (hybrid vehicle, hydrogen fuel-cell vehicle, electric vehicle, etc.) using electrical energy source are increasing, too. The electromagnetic compatibility is getting more important for development of a vehicle because those advanced vehicles are equipped with more new electronic systems. In general, electromagnetic compatibility tests consist of an electromagnetic interference (EMI) test and an electromagnetic susceptibility (EMS) test. In this paper, in order to investigate the electromagnetic interference in the cabin of vehicle by various electric and electronic components of vehicles, a series of narrowband electromagnetic emission tests are conducted. For comparison, the several digital home appliances (smartphone under charging, laptop compuer and digital camera), which are used a lot in daily lives, are tested.

마그네슘 합금 AZ31 판재의 온간 사각컵 디프드로잉 공정의 유한요소 해석 (Finite-Element Analysis of Warm Square Cup Deep Drawing Process of Magnesium Alloy AZ31 Sheet)

  • 김흥규;이위로;홍석관;김종덕;한병기
    • 소성∙가공
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    • 제15권3호
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    • pp.232-240
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    • 2006
  • Magnesium alloys are expected to be widely used fur the parts of structural and electronic appliances due to their lightweight and EMI shielding characteristics. While the die casting has been mainly used to manufacture the parts from the magnesium alloys, the press forming is considered as an alternative to the die casting for saving the manufacturing cost and improving the structural strength of the magnesium alloy parts. However, the magnesium alloy has low formability at room temperature and therefore, in many cases, forming at elevated temperatures is necessary to obtain the required material flow without failure. In the present study, square cup deep drawing tests using the magnesium alloy AZ31 sheet were experimentally conducted at various elevated temperatures as well as room temperature, and the corresponding finite-element simulations, which calculated the damage evolution based on the Oyane's criterion, were conducted using the stress-strain relations from the tensile tests at various temperatures. The formability predictability by the finite-element analysis was investigated by comparing the predicted damage distributions over the deformed AZ31 sheet at elevated temperatures with the corresponding experimental deformations with failures.

마그네슘 합금 AZ31 판재의 온간 사각컵 딥드로잉 성형성의 유한요소 해석 (Finite-Element Analysis of Formability in Warm Square Cup Deep Drawing of Magnesium Alloy AZ31 Sheet)

  • 김흥규;이위로;홍석관;한병기;김종덕
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 추계학술대회 논문집
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    • pp.122-125
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    • 2005
  • Magnesium alloys are expected to be widely used for the parts of structural and electronic applications due to their lightweight and EMI shielding characteristics. While the die casting has been mainly used to manufacture the parts from the magnesium alloys, the press forming is considered as an alternative to the die casting for saving the manufacturing cost and improving the structural strength of the magnesium alloy parts. However, the magnesium alloy has low formability at room temperature and therefore, in many cases, forming at elevated temperatures is necessary to obtain the required material flow without failure. In the present study, square cup deep drawing tests using the magnesium alloy AZ31 sheet were experimentally conducted at various elevated temperatures as well as room temperature, and the corresponding finite-element simulations, which calculated the damage evolution based on the Oyane's criterion, were conducted using the stress-strain relations from the tensile tests at various temperatures. The formability predictability by the finite-element analysis was investigated by comparing the predicted damage distributions over the deformed AZ31 sheet at elevated temperatures with the corresponding experimental deformations with failures.

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심해저 환경을 고려한 장거리 케이블 및 필터 설계 (Design of Long Distance Cable and Filter considering the Subsea Environment)

  • 권혁준;김병우
    • 한국산학기술학회논문지
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    • 제14권10호
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    • pp.5105-5114
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    • 2013
  • 본 논문은 심해저 환경을 고려한 케이블 및 필터 설계에 관한 연구를 수행하였다. 심해저 플랜트에서 사용하고 있는 전기 아키텍처는 해상에서 고전압의 전원 공급 장치, 고용량 구동시스템, 장거리 케이블과 전동기로 구성되어있다. 전도 노이즈는 전동기 구동용 인버터의 고속 스위칭 시 발생하는 급속한 전압변화로 인해 발생하며, 케이블의 길이가 길어질수록 전동기에 심각한 과도 전압을 발생시킨다. 따라서 심해저 플랜트에 사용되는 장거리 케이블의 R, L, 선간 C, 선-접지 C를 고려한 선로를 설계하여 구동 전동기에 발생하는 과전압을 확인하였다. 또한, PWM 인버터 구동시스템의 전도 노이즈 저감을 위한 필터를 설계하여 심해저 플랜트 모델의 가이드라인을 제안하고자 한다.

Numerical investigation of an MR damper-based smart passive control system for mitigating vibration of stay cables

  • Kim, In-Ho;Jung, Hyung-Jo;Kim, Jeong-Tae
    • Structural Engineering and Mechanics
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    • 제37권4호
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    • pp.443-458
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    • 2011
  • An extensive numerical investigation on the magnetorheological (MR) damper-based smart passive control system for mitigating vibration of stay cables under wind loads has been conducted. The smart passive system is incorporated with an electromagnetic induction (EMI) device for reducing complexity of the conventional MR damper based semi-active control system by eliminating an external power supply part and a feedback control part (i.e., sensors and controller). In this study, the control performance of the smart passive system has been evaluated by using a cable structure model extracted from a full-scale long stay cable with high tension. Numerical simulation results of the proposed smart damping system are compared with those of the passive and semi-active control systems employing MR dampers. It is demonstrated from the results that the control performance of the smart passive control system is better than those of the passive control cases and comparable to those of the semi-active control systems in the forced vibration analysis as well as the free vibration analysis, even though there is no external power source in the smart passive system.

경계조건을 반영한 하이브리드 자동차 배터리 모델링 (Hybrid Vehicle Battery Modeling using Boundary Condition)

  • 이재중;이준상;배현주;김미로;권혁수;나완수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.1678-1679
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    • 2011
  • 고속/고전압으로 동작하는 자동차 전장품에 대한 EMI/EMC(Electromagnetic Interfere / Electromagnetic Compatibility) 문제는 기존의 PCB(Printed Circuit Board)에서의 문제와 다르며 하이브리드/전기 자동차에서 중요하게 다뤄지는 배터리에 대한 최적화 된 모델링 방법이 본 논문에 소개 되어있다. 기존의 단순한 저항과 커패시터의 연결로 표현 된 모델링이 아닌 고주파를 반영 할 수 있는 모델링 방법을 사용하였다. 이를 분석하기 위해 ANSYS사의 Simplorer와 Matlab을 사용해서 결과를 보았다. 본 논문에서는 DOD(Depth Of Discharge)에 따른 통합 등가회로 모델을 구현하면서 기존의 단순한 지수함수 곡선적합(Curve fitting)이 아닌 SOC(State Of Charge)의 경계조건을 반영하여 정확성을 높였다. 이로써 실험 데이터를 이용해 배터리 등가회로 모델링을 하여 정확한 배터리 동작의 해석을 할 수 있고 이에 따른 전도성 방사(CE : Conducted Emission)문제에 보다 쉽게 접근 할 수 있다.

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System Strategies for Time-Domain Emission Measurements above 1 GHz

  • Hoffmann, Christian;Slim, Hassan Hani;Russer, Peter
    • Journal of electromagnetic engineering and science
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    • 제11권4호
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    • pp.304-310
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    • 2011
  • The application of time-domain methods in emission measurement instruments allows for a reduction in scan time by several orders of magnitude and for new evaluation methods to be realized such as the real-time spectrogram to characterize transient emissions. In this paper two novel systems for time-domain EMI measurements above 1 GHz are presented. The first system combines ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion to enable measurements in the range from 10 Hz to 26 GHz with high sensitivity and full-compliance with the requirements of CISPR 16-1-1. The required IF bandwidths were added to allow for measurements according to MIL-461F and DO-160F. The second system realizes a system of time-interleaved analog-to-digital converters (ADCs) and has an upper bandwidth limit of 4 GHz. With the implementation of an automatic mismatch calibration, the system fulfills CISPR 16-1-1 dynamic range requirements. Measurements of the radiated emissions of electronic consumer devices and household appliances like the non-stationary emissions of a microwave oven are presented. A measurement of a personal computer's conducted emissions on a power supply line according to DO-160F is given.