Analysis and Design Guide of Active EMI Filter in a Compact Package for Reduction of Common-Mode Conducted Emissions

Shin, Dongil; Kim, Sung-Nam; Jeong, Geunseok; Park, Jaesu; Park, Joungwook; Han, Ki Jin; Kim, Jingook

doi:10.1109/temc.2015.2401001

Cited by 74 publications

(10 citation statements)

References 16 publications

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“…Hybrid filters comprise of an active filter (containing amplifiers and other active devices) and a smaller passive filter. [169][170][171] Goswami et al developed a DM active filter for boost power factor correction AC/DC converter. The proposed filter was able to reduce the EMI noise by 30-35 dB.…”

Section: Emi Filtersmentioning

confidence: 99%

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

Mathur

Raman

2020

Journal of Elec Materi

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Electromagnetic interference (EMI) is one of the biggest challenges faced during the production of any electronic device. The effect on the performance of the instrument due to these inevitable interferences must be carefully measured to understand and quantify the electromagnetic compatibility (EMC) of the instrument under test. If the EMI profile of the system does not meet the accepted standards, then it becomes necessary to take measures to reduce the influence of these unwanted interferences so that the equipment can be used in the real world. Unfortunately, research and studies on EMI and EMC have not received their due attention from the scientific community. Moreover, the literature available for this area of research is scattered where different sources provide information on one or more (but not all) aspects of EMI/EMC while ignoring the others. With the objective of encompassing this extremely significant area of research in its entirety, this review presents both EMI measurement techniques and EMI reduction techniques in detail. EMI measurement techniques are presented under two sections that deal with emission testing and immunity testing, respectively. Herein, EMI reduction techniques are presented under four sections, where electromagnetic shielding has been given special attention under which various methods used by the scientific community to measure the shielding effectiveness of a material or microwave absorber and its application in EMI reduction are illustrated. This is followed by EMI filters, circuit topology modification and spread spectrum. This review can help students and young scientists in this area to get an idea of the ways to conduct EMI tests as well as the ways that can be employed to reduce the EMI of the system, depending on the application.

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Section: Emi Filtersmentioning

confidence: 99%

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

Mathur

Raman

2020

Journal of Elec Materi

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“…G CT (s) is the transimpedance of the current transformer as derived in equation (9). The closed-loop gain of the op-amp G amp (s) is derived in equation (14). Z inj (s) is the impedance of injection RC network as shown in equation (7).…”

Section: Outmentioning

confidence: 99%

“…Since hybrid EMI filters can achieve complementary advantages of passive filters and active filters, it has broader application prospects to provide an alternative approach both from the technical level and from the feasibility level. During the last decade, various hybrid filters have been put forward and applied in DC/DC converters [4], [9], [10], [21], [25], AC/DC converters [14], [27], [32], [33], motor drive systems [5]- [7], [12], [16], [17] etc. Di Piazza et al studied the hybrid EMI filter structure and used it in a motor drive system [7].…”

Section: Introductionmentioning

confidence: 99%

A Multi-Function Common Mode Choke Based on Active CM EMI Filters for AC/DC Power Converters

et al. 2019

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It is widely believed that hybrid electromagnetic interference (EMI) filter (HEF) is one of the most optimized solutions for EMI elimination. Nevertheless, the desire for a smaller and lighter filtering method has never stopped. To further reduce the size and weight of a hybrid EMI filter, this paper proposes a multi-function common mode choke (MCMC) used in HEF. It differs from the traditional common mode (CM) choke in that two functions of (1) CM signal sensing and (2) CM noise suppression are integrated into one choke. In such a proposed MCMC design, the traditional current transformer (CT) is eliminated in the hybrid filter topology. This technique could reduce the size, weight, and cost of the filter to a great extent. Based on the MCMC, a novel CM filter is proposed to achieve high-performance noise suppression. System model and stability feature of the new filter are developed and investigated in detail. A filter prototype based on the proposed MCMC is constructed. It is tested on a 100-W commercial ac/dc converter. The experimental results show that the proposed CM filter can provide better EMI noise suppression with a smaller size. The insertion loss could reach 50 dB at low frequencies and 40 dB at high frequencies.INDEX TERMS Hybrid EMI filter, common mode choke, modeling, electromagnetic interference (EMI).

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“…In spite of the advantages, it is known that SMPSs cause conducted and radiated emission at switching frequencies [2][3][4][5][6][7]. Also, Shin [4] reported that conducted and radiated emissions could result in system malfunctions and electromagnetic interference (EMI) at switching operation. Radiated emissions usually appear above 30 MHz as a result of circuit structure and/or cables.…”

Section: Introductionmentioning

confidence: 99%

EMI filter design based on the separated electromagnetic interference in switched mode power supplies

Yalcin¹,

Özen²,

Helhel³

2018

Turk J Elec Eng & Comp Sci

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Usage of switch mode power supplies (SMPS) has been increased tremendously in recent years due to their advantages compared to conventional ones. In spite of their advantages, SMPSs cause conducted and radiated emissions due to the fact that they switch on and off at specific frequencies. Electromagnetic interference (EMI) filters are mostly preferred equipment for the reduction of conducted emission for coupled circuits. Improved EMI filter in the literature to suppress both common and differential mode noises sourced by ATX (a sample of SMPS) power supply has been proposed. A proposed filter was designed by use of AWR Microwave Office and MATLAB. The power supply was tested according to CISPR22 and it was observed that it has 30 dB higher noise level compared to the limit. A new improvement has also been proposed in order to separate resultant EMI into its common and differential modes for proper EMI filter design. The designed filter, by considering common and differential modes, suppresses those noises by 37 dB.

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Analysis and Design Guide of Active EMI Filter in a Compact Package for Reduction of Common-Mode Conducted Emissions

Cited by 74 publications

References 16 publications

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

A Multi-Function Common Mode Choke Based on Active CM EMI Filters for AC/DC Power Converters

EMI filter design based on the separated electromagnetic interference in switched mode power supplies

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