• 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.

• 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 international Conference on Electrical Machines and Systems
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• 제2권1호
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• pp.57-64
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• 2013

The functional characteristic of LISN circuit, which is used for measurements of conductive noise in mains power line, is basically related to frequency characteristics of passive elements like inductors used in the circuit as well as the frequency response of inductors is highly related to the resins used in the varnishing process. The significant problem in determination of an inductor's frequency characteristic is the intrinsic resistance, inductance and parasitic capacitance. In this triplet, the parasitic capacitance is the major limiting factor of inductor's frequency range. This capacitance depends on inductor design parameters and materials filling the spaces of coil like resin and its coherency after curing process. In this paper, two similar inductors were designed and built. The first inductor was not varnished while the second one was varnished with VPI technology. VPI, or Vacuum, Pressure, Impregnation technology is one of the most reliable methods performing good insulating conditions for electrical circuits and windings based on resins. The measured results show that implying varnishing technology does not significantly affect the frequency response. However, due to mechanical solidity aspects and improved environmental protection, it is better to varnish the inductors.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.440-442
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• 1996

In this paper, characteristics of harmonic spectrum are studied for three phase PWM converter as the switching frequency variation and current control method changing. Especially, Differential Mode Noise which causes harmful effect on the other equipments is measured and compared with three phase diode rectifier.

• 한국인터넷방송통신학회논문지
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• 제23권4호
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• pp.35-40
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• 2023

EMC 시험을 위해서는 EUT가 정상적인 동작을 유지하고 있는 상황에서 EUT의 방사 특성과 내성 특성을 측정하게 된다. EUT의 정상적인 동작을 위해서는 무반향 챔버 외부에서 별도의 장비를 통하여 EUT를 동작시키고 상태를 모니터링해야 한다. 외부 장비는 1553B 통신, RS-485 통신, Ethernet 통신 등 다양한 통신을 통하여 EUT를 동작시키고 모니터링을 하게 된다. 이때 외부 장비가 통신 LINE을 통하여 잡음을 전달할 수 있다. 이러한 잡음은 연결된 전원케이블을 통하여 LISN에 전달되어 측정되게 된다. 또한 LISN에 연결단자를 통하여 방사되기도 한다. 이러한 경우 통신 LINE이 전원 LINE과 최대한 전자기적 격리를 통하여 잡음이 전달되지 못하도록 설계하여야 한다. 또한 외부 장비의 잡음이 통신 LINE을 통하여 챔버안으로 들어가는 것을 최대한 억압하야여 한다. 본 논문에서는 EMC 시험을 위하여 적용되는 외부의 EUT 시험장비의 설계 및 제작시 고려사항들에 대하여 설명하고 CE, RE를 포함한 시험을 통하여 설계 만족에 대하여 설명한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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• pp.303-306
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• 2002

The EMI filter used in switching apparatus is designed on the basis of personal designer experience. A try and error approach leads to a considerables waste of time without assurance to come out to a good solution. The difficulty in the right choice of the component values resides on the dominant role played by their parasitic components at high frequencies and is aggravated by the poor knowledge of the internal impedance of the noise generators. In this paper, we proposed the design technique for the EMI filter effectively using the LISN and the EMI analyzer in the industrial field.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권3호
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• pp.249-258
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• 2009

The measure of common-mode current on a cable can be closely correlate to the radiated emissions from the cable. This paper describes that to use the conducted emissions measurement method for calculating radiated emissions and compares them the measured radiated measurement results. For that the LISN which cover the radiated emissions frequency was developed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.470-473
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• 2004

This paper presents conducted emission noise measurement from electronic equipment in frequency range of 1 MHz up to 30 MHz by small loop antenna. Small loop antenna measurement method can measure common-mode (CM) and differential-mode (DM) component of the noise on a pair of power line at the same time. The CM and DM can be measured separately. The theory of this measurement method is introduced and analyzed. The measured results were compared with the conventional measurement by Line Impedance Stabilization Network (LISN) and result a good trend between those methods.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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• pp.79-82
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• 2003

The switching-mode power converter has been widely used because of its features of high efficiency and small weight and size. In the switching-mode power converter, the output voltage is generally controlled by varying the duty ratio of main switch. When a converter operates in steady state, duty ratio of the converter is kept constant. So the power of switching noise is concentrated in specific frequencies. The more white noise is injected, the more conducted EMI is reduced. But output-voltage is not sufficiently regulated. This is the reason why carrier frequency selection topology is proposed. In the case of carrier frequency selection, output-voltage of steady state and transient state is fully regulated. 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 LISN, which are connected to the spectrum analyzer respectively.

• JSTS:Journal of Semiconductor Technology and Science
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• 제13권2호
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• pp.114-126
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• 2013

In this paper, we present a set of methodologies to model the electromagnetic susceptibility (EMS) testing of I/O buffers for mobile system memory based on the bulk current injection (BCI) method. An efficient equivalent circuit model is developed for the current injection probe, line impedance stabilization network (LISN), printed circuit board (PCB), and package. The simulation results show good correlation with the measurements and thus, the work presented here will enable electromagnetic susceptibility analysis at the integrated circuit (IC) design stage.