• Title, Summary, Keyword: EMI filter

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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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A Study on the Combining Circuit of New Active EMI Filter (새로운 능동EMI필터의 결합회로에 관한 연구)

  • Choi, Min-Whan;Shin, Dong-Seok;Lee, Dong-Ho;Park, Chong-Yeun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.6
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    • pp.78-89
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    • 2015
  • Conventional EMI filters have tried to use an active EMI filter as a series by the series connection of two EMI filters for CM and DM noise. However, the proposed filter is formed into one circuit by using the active EMI filter which is able to filter CM and DM noise components together. As a result, the active EMI filter showed the outstanding quality in mass and volume under 50% and electric characteristics have been compared to the passive EMI filter in approximately 150kHz~10MHz. Furthermore, the proposed circuit has simple circuit components by comparing with the series EMI filters, and electrical characteristics are similar. The noise have been attenuated to maximum 20dBuV.

Scattering Parameter-based Measurement of Planar EMI filter

  • Wang, Shishan;Gong, Min;Xu, Chenchen
    • Journal of Power Electronics
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    • v.14 no.4
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    • pp.806-813
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    • 2014
  • Planar electromagnetic interference (EMI) filters are widely used to restrain the conducted EMI of switching power supplies. Such filters are characterized by small size, low parasitic parameters, and better high-frequency performance than the passive discrete EMI filter. However, EMI filter performance cannot be exactly predicted by using existing methods. Therefore, this paper proposes a method to use scattering parameters (S-parameters) for the measurement of EMI filter performance. A planar EMI filter sample is established. From this sample, the relationship between S-parameters and insertion gain (IG) of EMI filter is derived. To determine the IG under different impedances, the EMI filter is theoretically calculated and practically measured. The differential structure of the near-field coupling model is also deduced, and the IG is calculated under standard impedance conditions. The calculated results and actual measurements are compared to verify the feasibility of the theory.

A Study on the Active EMI Filter for LED Driver (LED 구동장치용 능동 EMI 필터의 실현)

  • Lee, Dong-Ho;Choi, Min-Whan;Park, Chong-Yeun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.2
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    • pp.62-68
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    • 2015
  • Recently, LED is being used as various applications such as home lightings, work lightings and so on. EMI noise generated from LED driver have become a problem according to increase the use of LED. In this paper, Active EMI filter composed active and passive components is discribed as a method of solving a problem of EMI. The proposed filter is applied to the 160W LED load to verify performance experimentally. To compare the performance, We did an experiment using the proposed filter and the passive filter on the same 160W LED load and Driver System. As a result, The proposed Active EMI filter attenuated Conduction EMI noise better than any existing passive filter.

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.

The Characteristics of Planar EMI Filter with Bi-Ground Layers Considering Impedance Mismatching

  • Wang, Shishang;Song, Zheng;Lou, Qianceng
    • Journal of Power Electronics
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    • v.16 no.3
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    • pp.1200-1208
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    • 2016
  • Planar electromagnetic interference (EMI) filter has significant engineering significance to power electronic system integration and miniaturization. However, the value of differential mode capacitance cannot meet the demand of noise suppression because of the size limit of ceramics. In this case, the EMI filter of novel multilayers is recommended to address this issue. A novel integrated structure of EMI filter based on multilayer ceramic is proposed in this study. The inductance and capacitance of the new structure can be designed separately, which is an advantage in manufacturing. Insertion loss is measured more closely to the actual situation in this study, which is different from the condition where source and load impedances are both 50 Ω. In the process of designing a novel EMI filter, noise impedance is considered. Moreover, the prototype is created and applied to a small switching power supply, which verifies the effectiveness of the developed EMI filter.

Design of Wideband Facility Power-line EMI filter (광대역 설비용 전원선 EMI 필터의 설계)

  • Chung, Se-Kyo;Lim, Jeong-Gyu;Kim, Mu-Hyun;Kang, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.6
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    • pp.440-448
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    • 2009
  • Facility power-line electromagnetic interference (EMI) filters are used to provide radio frequency(RF) isolation between dedicated power distribution services and noise sensitive local power distribution systems. This type of EMI filters generally needs a high current capacity and, in some special applications, a high insertion loss of a minimum 100dB from 14kHz through 10GHz per MIL-STD 220 is required. This paper deals with an analysis and design of a wideband facility power-line EMI filter with the above requirements. The characteristics of the inductor and capacitor at high frequencies are investigated. The characteristics and design method of the facility EMI filter with a high order LC network are also presented. The prototype filter is finally implemented and its performance is verified from the experimental results.

Modeling and Filter Design through Analysis of Conducted EMI in Switching Power Converters

  • Vimala, R.;Baskaran, K.;Aravind Britto, K.R.
    • Journal of Power Electronics
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    • v.12 no.4
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    • pp.632-642
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    • 2012
  • This paper presents a filter analysis of conducted Electro-Magnetic Interference (EMI) in switching power converters (SPC) based on noise impedances. The EMI characteristics of SPC can be analytically deduced from a circuit theoretical viewpoint. The analytical noise model is investigated to get a full understanding of the EMI mechanism. It is shown that with suitable and justified model, filters pertinent to EMI noise is investigated. The EMI noise is identified by time domain measurements associated with an isolated half-bridge ac-dc converter. Practical filters like LC filter, ${\pi}$ filter and complete EMI filters are investigated. The proposed analysis and results can provide a guideline for improving the effectiveness of filtering schemes in SPC. Experimental results are also included to verify the validity of the proposed method. The results obtained satisfy the Federal Communications Commission (FCC) class A and class B regulations.

Design of Low Pass Filter to reduce EMI from 2.SG SDH system (2.5G SDH 전자파 감소용 저역통과필터 설계)

  • 이성원;김영범
    • Journal of the Korea Society for Simulation
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    • v.10 no.4
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    • pp.21-30
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    • 2001
  • In this paper, EMI measurement, the STGU simulation being conducted, filter design, its characteristics, and its implementation to the PCB, and finally test results are discussed. When the low pass filter was implemented within the STGU, the power of EMI decreased more than 20dBm. Finally, when TE and MTIE, two important quality measure in synchronous reference clock, was assessed, ITU-T G813 requirement was satisfied. EMI(Electromagnetic Interface) is a measure of electomagnetic radiation from equipment in the range of 10KHz to 3GHz, and can cause unexpected reactions of electronics/electrical equipment. In this study, for safe and stable communication operation, a STGU (System Timing Generation Unit), which is a 2.5G SDH System and a major EMI source, was employed to simulate electromagnetic interface. Using Open-Site test, the power of fundamental frequency of EMI of interest and its harmonics were measured. Also, a low pass filter at cut-off frequency of 2GHz was specifically designed for this study to minimize the effect of EMI between electronic components.

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Modeling and Design Algorithm of Conducted EMI Filter Using a Noise Separation Method (노이즈 분리 기법을 이용한 진도EMI 필터의 모델링 및 설계 알고리즘)

  • 정용채
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.3
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    • pp.260-266
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    • 2004
  • Because the EMI filter is mainly designed by trial and error method, it takes many times to reduce the conducted EMI noise in a power converter. Thus, a newly analytical design procedure is proposed to overcome the problem in this paper. High frequency models of each component are built, md, using the modeling circuits, the filter design is carried out applicable to each mode. Based on the accumulated database for practical components, and the measurement data of EUT with a standard filter, the filler design algorithm is presented. Finally, the validity of the Proposed models and design method is verified through the measurement results.