• 전력전자학회논문지
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• 제2권2호
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• pp.41-48
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• 1997

최근 고품질 전원공급에 관한 요구가 증대되면서 장치에서 발생되는 고차 고조파에 의하여 다른 기기의 오동작을 방지하기 위한 EMI(Electro Magnetic Interferencfe)에 관한 연구가 전력전자분야를 중심으로 활발하게 진행되고 있다. 따라서 본 논문에서는 3상 전력변환 장치인 다이오드 정류기와 PWM 컨버터에서 PI 전류제어방식과 히스테리시스 전류제어방식을 대상으로 LISN(Line Impedance Stabilization Network)을 사용하여 제어방식의 변화와 스위칭 주파수 변동에 따른 전도성 EMI 방출량을 측정하여 비교하였다.

• Journal of Power Electronics
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• 제2권2호
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• pp.124-129
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• 2002

Invertigation electromagnetic emissione of inverter power sources resistance welding existing special aspects of EMI measurements in the field of resistance welding machines resulting from the power rating and operation mode of these machines have to be taken into account. The characteristics of the internal switching processes determined by the behavior of the applied power semiconductors, sunbber circuits and constructional aspect exert a great influence on the conducted emission welding inverters.

• Journal of Power Electronics
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• 제18권3호
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• pp.871-878
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• 2018

In this paper, the conducted EMI reduction performances of active feed-forward current-sensing current-actuation (CSCA) and voltage-sensing current-actuation (VSCA) filters for a three-phase induction motor drive system are evaluated by experiments. For comparison purposes, the conducted EMI (CM emission, DM emission and total emission) of a three-phase induction motor drive with a conventional CM choke, a conventional CM choke in series with an active VSCA filter, and an active CSCA filter (where the CM choke was modified and used as a sensing current transformer) were compared to the case of a system without any filter inserted. Experimental results show that the active CSCA and VSCA filters can improve the CM reduction performance of the conventional CM choke by about 5 dB especially at low-frequencies. However, for DM comparisons, it shows that there is no different between cases with and without filters inserted.

• 전기학회논문지
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• 제60권1호
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• pp.109-113
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• 2011

This paper analyzes the noise sources of an LED lighting module with TRIAC dimming control and proposes an improved EMI filter design for the reduction of conducted noise emission. TRIAC dimming invokes problems of input oscillation and capacitor overvoltage at the lighting module. The proposed double LC filter reduces high noise level from the circuit. The experimental and simulation results show that this approach can make significant contributions to the reduction of conducted noise emission from an LED lighting module with TRIAC dimming control.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.212-215
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• 1995

In this paper, The characteristic of Harmonic spectrum is studied for generally used three-phase diode rectifier. and filter design criteria is showen in the sense of THD, DPF, and PF. As the becoming of Automative and informative era, the demand of critical and stable control becomes more and more important. But much EMI emissions are generated for more critical and stable control in power electronic system these EMI emissions can be measured using LISN(Line Impedance Stabilization Network). So we are to investigate the behavior of Conducted EMI emission in Diode Rectifiers using LISN in frequency domain.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1576_1576
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• 2009

We present the design of an EMI filter to mitigate the electrical noise from the power supply over a broadband of a few tens of KHz to 18GHz. Admitting that our approach is not apart from the standard technology of EMI filter, it is worth checking out how we can implement the filter that meets the challenging spec. on band of operation. The function of the EMI filter is well-depicted by its performance on the CE(Conducted Emission) and RE(Radiated Emission) suppression through tests which convince us of its application to power supplies of land, water and flying vehicles.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.60-63
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• 2001

Investigating electromagnetic emissions of inverter power sources for resistance welding existing special aspects of EMI measurements in the field of resistance welding machines resulting from the power rating and intermittent operation mode of these machines have to be taken into account. The characteristics of the internal switching processes determined by the behavior of the applied power semiconductors, snubber circuits and constructional aspects exert a great influence on the conducted emission of resistance welding inverters.

• 한국전자통신학회논문지
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• 제6권5호
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• pp.643-648
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• 2011

본 연구에서는 공항, 철도, 항만 등 대형 교통수단의 표시등으로 사용하기 위하여 SMPS에 의하여 구동되는 LED 신호등을 설계하고 제작된 LED 신호등의 전기적 특성과 EMI 특성을 조사하였다. 10V 이상의 교류 및 직류입력전압에 대한 출력전류는 1.67A이었다. 0.15~30MHz에서 측정한 잡음단자전압은 허용기준 준첨두치와 허용기준 평균치 보다 낮았으며, 30~1000MHz에서 측정한 잡음전계강도는 59.96MHz에서 $23.96dB{\mu}V/m$이었다.

• 전기학회논문지
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• 제63권2호
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• pp.266-271
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• 2014

The Electromagnetic Interference(EMI) generating from corona discharge of transformer area can interference the digital Instrument and Control(I&C) systems located nearby transformers. When the potential gradient of the electric field around the conductor is high enough to form a conductive region but not high enough to cause electrical breakdown to nearby objects, the EMI of corona discharge emits with the conducted and radiated noise and it interferences the signals of the I&C systems. Since digital I&C systems have an efficiency and competitive price, the analog I&C systems have been upgraded and displaced with the digital I&C systems but which have less EMI Immunity. There was no assessment to I&C systems by EMI generating corona discharge nearby transformers. When the safety-related I&C systems are installed in plants, the verification of equipment EMI should be done not in site-specific test but in test facilities. There are the need to do the site-specific EMI evaluation of corona discharge nearby transformers. This paper assesses the margin between plant emission limits and the highest composite plant emission of corona. When the non safety-related I&C systems are placed in transformer area, it suggests the appropriate radiated susceptibility level to EMI of corona discharge.

• 한국융합학회논문지
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• 제9권2호
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• pp.1-6
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• 2018

본 연구에서는 전기 자동차용 DC/DC converter 회로의 전도성/복사성 방사 분석 결과를 제시하고 있다. 일반적으로 사용되는 MPQ4433 칩을 이용한 전력 변환회로의 EMI 특성을 개선하기 위해 주파수 확산 회로를 적용하였다. TLV3201칩을 사용한 주파수 확산 회로가 설계되어 전력변환 회로에 적용되었다. EMI 시뮬레이션을 통해 최적의 PCB 제작되었으며, 제작된 회로를 이용하여 원거리 방사, 근거리 전도 및 복사 방출에 대한 시뮬레이션과 측정 결과가 제시되었다. 전도 및 방사 방출은 CISPR 25의 표준화 된 시험 절차에 따라 측정되었으며 주파수 확산이 적용된 경우에 EMI 특성이 약 20% 개선되는 결과를 얻었다. 본 연구에서 제안 된 주파수 확산을 이용한 EMI 저감 기술은 자동차용 전력 컨버터 모듈의 설계에 처음 적용되었으며 향후 EMI 개선에 효과적으로 사용될 수 있을 것으로 예상된다.