Relevant bibliographies by topics / EMI Filter

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'EMI Filter'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 March 2025

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Journal articles on the topic "EMI Filter"

1

Şehirli, Erdal. "Examining the Design of Different Types of DM EMI Filters and Their Effect on EMI Noise and Control Characteristics for Cuk DC-DC Converter." International Transactions on Electrical Energy Systems 2023 (March 15, 2023): 1–18. http://dx.doi.org/10.1155/2023/7101065.

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In this paper, DM EMI filters including LC, LC with damping, and Pi and LCL filters are designed for DC-DC Cuk converter operated in BCM. Although, DM EMI is so important for any power converter, the effect of DM filter is not investigated in detail in literature with respect to control characteristics and DM noise reduction. The main contribution of this paper is comparisons of DM EMI filter topologies regarding control characteristics and EMI noise reduction which is not presented in the literature. Another contribution is to give a practical design methodology for EMI filter design avoiding complex mathematical procedures. Besides, the paper designs an LCL filter, popular for inverter applications, for Cuk converter that is not introduced in the literature. Examining the filter effect on the converter from the control point of view is a very complicated issue because a linearized model of the converter which is naturally nonlinear should be obtained. To do so, the converter’s small signal analysis must be derived. Therefore, for examining the effect of filters, a small signal analysis of the Cuk converter is made through an average state-space model. After that, transfer functions of each filter topology are obtained. Lastly, the entire transfer functions of the system using both the Cuk converter and each filter are acquired, separately. By using the transfer functions of overall systems, the effect of each filter topology is investigated by root locus and bode plots. Moreover, experimental verification of all filters is realized over a 15 W Cuk converter with a 25 kHz switching frequency. It is validated by applications that the LCL filter provides better control characteristics on the Cuk converter, the total inductor value is reduced by 30% and the total capacitor value is reduced by 25% compared to other filters. However, with respect to DM noise Pi and LC filters give better results.
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He, Hong, Shuai Bao, Hang Li, Da Jian Zhang, and Ming Feng Hou. "The Filter Technology of Switching Power Supply." Advanced Materials Research 204-210 (February 2011): 482–85. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.482.

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The basic principle of switching power supply EMI filter was described. The circuit principle of passive EMI filter and several topology circuit of active EMI filter were introduced. Active EMI filter with feedforward, active EMI filter without current detection sensors installed and active EMI filter for three-phase inverter motor were researched. The problem that following the frequency rising of switching power supply, the EMI noise pollution was becoming more and more serious than before was solved. These growing pollutions had resulted in widespread application of EMI filter technology and in the meantime higher requirements were raised to EMI filter technology.
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Zhang, Zhi Hong, Bao Feng Zhang, and Guang Quan Li. "Filter Technology in the Switching Power Supply." Advanced Materials Research 787 (September 2013): 726–30. http://dx.doi.org/10.4028/www.scientific.net/amr.787.726.

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With the increase of switching frequency of power switch, EMI noise pollution becomes more and more serious. In order to solve this problem, in this paper, the switch power supply filter and passive EMI filter, active EMI filter is studied. It mainly research active EMI filter with feed forward , non-inductive current detection device of active EMI filter and active EMI filter for three-phase inverter motor. To solve this problem which is that EMI noise pollution has become more serious along with the increase of switching frequency switch power supply, the increasingly serious pollution make the EMI filter technology have a wide range of applications and put forward higher request to filter technology
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Ahmad, Fally, Mohammad Yanuar Hariyawan, and Siska Novita Posma. "Perancangan Dan Implementasi Passive Emi Filter Pada Switching Mode Power Supply (SMPS)." Jurnal Elektro dan Mesin Terapan 5, no. 1 (2019): 29–37. http://dx.doi.org/10.35143/elementer.v5i1.2519.

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Kebutuhan akan perangkat elektronik dengan frekuensi yang tinggi menyebabkan meningkatnya jumlah Electromagnetic Interference (EMI) yang memiliki dua jenis yaitu Conducted Emission dan Radiated Emission. Solusi dari mitigasi EMI tersebut adalah dengan menggunakan filter EMI. Switching Mode Power Supply (SMPS) merupakan sumber daya bagi hampir seluruh perangkat elektronik, namun SMPS ini juga sumber EMI untuk perangkat lain atau bahkan perangkat itu sendiri. Banyak perangkat elektronik yang beredar dipasaran namun belum memenuhi standar EMC. Dalam hal ini mitigasi EMI yang dapat dilakukan adalah dengan menggunakan filter EMI eksternal pasif. Dengan filter pasif ini EMI dari SMPS dapat diredam tanpa memerlukan energi tambahan untuk filter itu sendiri. Penelitian ini akan melakukan perancangan filter EMI untuk meredam noise conducted emission menggunakan sebuah passive EMI filter (PEF) pada SMPS. Filter PEF yang telah dirancang dan diujikan dapat digunakan pada SMPS 1 dan SMPS 2 dengan noise conducted emission sebelum filter sebesar 97,86 dBµV yang diredam menjadi 33 dBµV dan menghasilkan redaman noise conducted emission yang sangat baik (hingga 64,86 dBµV) dan memenuhi standar yang ditetapkan (CISPR22 Class B).
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Pasko, Marian, and Marek Szymczak. "Evaluation of hybrid EMI filters to reduce the high level of conducted noise generated by the frequency inverter." ITM Web of Conferences 28 (2019): 01028. http://dx.doi.org/10.1051/itmconf/20192801028.

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This article presents an analysis of the applicability of hybrid EMI filters to reduce common mode noise. The effectiveness of filters was tested when attenuating the high level of EMI noise generated by the frequency inverter. The influence of the use of various magnetic cores in the hybrid EMI filter construction was investigated and the obtained insertion losses with passive filters were compared. The article concludes with the summary of both filtration techniques.
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Luna, Massimiliano, Giuseppe La Tona, Angelo Accetta, Marcello Pucci, and Maria Carmela Di Piazza. "An Evolutionary EMI Filter Design Approach Based on In-Circuit Insertion Loss and Optimization of Power Density." Energies 13, no. 8 (April 16, 2020): 1957. http://dx.doi.org/10.3390/en13081957.

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Power density is one of the most significant issues in designing electromagnetic interference (EMI) filters for power electronic-based applications. Therefore, an effective EMI filter design should consider both its capability to ensure the compliance with the related EMI standard limits and the possibility to build it by suitable components leading to the most compact configuration as well. To fulfill the above requirements, in this paper, an automatic procedure to get an improved design of EMI filters is proposed. Specifically, according to the proposed method, the values of filter parameters for both common mode (CM) and differential mode (DM) sections are selected by a genetic algorithm (GA) exploiting the in-circuit insertion loss, thus obtaining a more effective design. Besides, the components that set up the filter are selected by a rule-based procedure searching through a suitable database of commercial components to identify those allowing for the maximum power density. Experimental tests were performed using an inverter-fed induction motor drive as a case study, and the obtained results have demonstrated the validity of the proposed approach.
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Vinaychowdary, I., and Ch R Phani Kumar. "Modelling of a Filter using EMI/EMC Considerations." International Journal of Computer Applications 120, no. 6 (June 18, 2015): 7–11. http://dx.doi.org/10.5120/21229-3966.

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Sazali, M. S., Saharul Arof, Philip Mawby, Hamzah Arof, and Emilia Noorsal. "Series Motor Four Quadrants Drive DC Chopper Controllers Noise Cancellation." IOP Conference Series: Earth and Environmental Science 1261, no. 1 (December 1, 2023): 012029. http://dx.doi.org/10.1088/1755-1315/1261/1/012029.

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Abstract DC Series motor armature reaction causes EMI. EMI generates noise signals that affect feedback sensor readings, feedback controller function, and controller halting. This paper discusses software discrete filter and RLC hardware filter noise cancellation and filtering. The filter eliminates EMI-induced IGBT gate firing noise. Matlab/Simulink tests the filter circuit and digital filter control method, confirming software and hardware filter implementation.
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Kotny, J. L., T. Duquesne, and N. Idir. "Influence of the common mode impedance paths on the design of the EMI filters used with SiC-buck converter." Advanced Electromagnetics 4, no. 2 (December 9, 2015): 44. http://dx.doi.org/10.7716/aem.v4i2.281.

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This paper deals the design of EMI filter associated with buck converter using fast semiconductors silicon carbide SiC (diode and transistor JFET). To comply with EMC standards, a filter design method based on an equivalent electrical circuit is proposed. The aim is to identify the different values of the EMI filter elements but also to obtain the limits values of the parasitic elements of the passive components which have a major influence on the attenuation of the filters. The purpose is to study the influence of the modification of the common mode propagation paths before and after the installation of the filter. A solution is also proposed to reduce the conducted disturbances that occur at high frequency caused by the fast SiC components.The comparison of the simulation results with the measurements data carried out on a DC-DC converter without and with the EMI filter, shows the effectiveness of the proposed design approach.
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Hou, Qun, Ya Ping Jin, and Yi Fan Zhou. "Electromagnetic Interference Testing and Suppression Methods for Automotive Window Lifter Motor." Applied Mechanics and Materials 433-435 (October 2013): 940–44. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.940.

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Window lifter motor is one of the potential electromagnetic interference (EMI) sources in automobile. Based on the research on the principle of Window lifter motor and the generation mechanism of EMI, its EMI characteristics are tested and analyzed. The EMI suppression methods are proposed. By comparing two filters methods,it shows that the designed filter suppresses the electromagnetic interference more effectively. Its conducted emission and radiated emission are lower than the second lever limits of CISPR 25-2007+.
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Dissertations / Theses on the topic "EMI Filter"

1

Chow, Albert C. (Albert Chin-Hoa) 1977. "Active filter techniques for reducing EMI filter capacitance." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87314.

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Narayanasamy, Balaji. "Impedance Mismatching Based Design of Passive and Active EMI Filters for Power Converters." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461252861.

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Liang, Yan. "Integrated Frequency-Selective Conduction Transmission-Line EMI Filter." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26360.

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The multi-conductor lossy transmission-line model and finite element simulation tool are used to analyze the high-frequency attenuator and the DM transmission-line EMI filter. The insertion gain, transfer gain, current distribution, and input impedance of the filter under a nominal design are discussed. In order to apply the transmission-line EMI filter to power electronics systems, the performance of the filter under different dimensions, material properties, and source and load impedances must be known. The influences of twelve parameters of the DM transmission-line EMI filter on the cut-off frequency, the roll-off slope, and other characteristics of the insertion gain and transfer gain curves are investigated. The most influential parameters are identified. The current sharing between the copper and nickel conductors under different parameters are investigated. The performance of the transmission-line EMI filter under different source and load impedances is also explored. The measurement setups of the DM transmission-line EMI filter using a network analyzer have been discussed. The network analyzer has a common-ground problem that influences the measured results of the high-frequency attenuator. However, the common-ground problem has a negligible influence on the measured results of the DM transmission-line EMI filter. The connectors and copper strips between the connectors and the filter introduce parasitic inductance to the measurement setup. Both simulated and measured results show that transfer gain curve is very sensitive to the parasitic inductance. However, the insertion gain curve is not sensitive to the parasitic inductance. There are two major methods to reduce the parasitic inductance of the measurement setup: using small connectors and applying a four-terminal measurement setup. The transfer gain curves of three measurement setups are compared: the two-terminal measurement setup with BNC connectors, the two-terminal measurement setup with Sub Miniature version B (SMB) connectors, and the four-terminal measurement setup with SMB connectors. The four-terminal measurement setup with SMB connectors is the most accurate one and is applied for all the transfer gain measurements in this dissertation. This dissertation also focuses on exploring ways to improve the performance of the DM transmission-line EMI filter. Several improved structures of the DM transmission-line EMI filter are investigated. The filter structure without insulation layer can greatly reduce the thickness of the filter without changing its performance. The meander structure can increase the total length of the filter without taking up too much space and results in the cut-off frequency being shifted lower and achieving more attenuation. A prototype of the two-dielectric-layer filter structure is built and measured. The measurement result confirms that a multi-dielectric-layer structure is an effective way to achieve a lower cut-off frequency and more attenuation. This dissertation proposes a broadband DM EMI filter combining the advantages of the discrete reflective LC EMI filter and the transmission-line EMI filter. Two DM absorptive transmission-line EMI filters take the place of the two DM capacitors in the discrete reflective LC EMI filter. The measured insertion gain of the prototype has a large roll-off slope at low frequencies and large attenuation at high frequencies. The dependence of the broadband DM EMI filter on source and load impedances is also investigated. Larger load (source) impedance gives more attenuation no matter it is resistive, inductive or capacitive. The broadband DM EMI filter always has more high-frequency attenuation than the discrete reflective LC EMI filter under different load (source) impedances.
Ph. D.
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Wang, Zijian. "Conducted EMI Noise Prediction and Filter Design Optimization." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73166.

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Power factor correction (PFC) converter is a species of switching mode power supply (SMPS) which is widely used in offline frond-end converter for the distributed power systems to reduce the grid harmonic distortion. With the fast development of information technology and multi-media systems, high frequency PFC power supplies for servers, desktops, laptops and flat-panel TVs, etc. are required for more efficient power delivery within limited spaces. Therefore the critical conduction mode (CRM) PFC converter has been becoming more and more popular for these information technology applications due to its advantages in inherent zero-voltage soft switching (ZVS) and negligible diode reverse recovery. With the emerging of the high voltage GaN devices, the goal of achieving soft switching for high frequency PFC converters is the top priority and the trend of adopting the CRM PFC converter is becoming clearer. However, there is the stringent electromagnetic interference (EMI) regulation worldwide. For the CRM PFC converter, there are several challenges on meeting the EMI standards. First, for the CRM PFC converter, the switching frequency is variable during the half line cycle and has very wide range dependent on the AC line RMS voltage and the load, which makes it unlike the traditional constant-frequency PFC converter and therefore the knowledge and experience of the EMI characteristics for the traditional constant-frequency PFC converter cannot be directly applied to the CRM PFC converter. Second, for the CRM PFC converter, the switching frequency is also dependent on the inductance of the boost inductor. It means the EMI spectrum of the CRM PFC converter is tightly related the boost inductor selection during the design of the PFC power stage. Therefore, unlike the traditional constant-frequency PFC converter, the selection of the boost inductor is also part of the EMI filter design process and EMI filter optimization should begin at the same time when the power stage design starts. Third, since the EMI filter optimization needs to begin before the proto-type of the CRM PFC converter is completed, the traditional EMI-measurement based EMI filter design will become much more complex and time-consuming if it is applied to the CRM PFC converter. Therefore, a new methodology must be developed to evaluate the EMI performance of the CRM PFC converter, help to simplify the process of the EMI filter design and achieve the EMI filter optimization. To overcome these challenges, a novel mathematical analysis method for variable frequency PFC converter is thus proposed in this dissertation. Based on the mathematical analysis, the quasi-peak EMI noise, which is specifically required in most EMI regulation standards, is investigated and accurately predicted for the first time. A complete approximate model is derived to predict the quasi-peak DM EMI noise for the CRM PFC converter. Experiments are carried out to verify the validity of the prediction. Based on the DM EMI noise prediction, worst case analysis is carried out and the worst DM EMI noise case for all the input line and load conditions can be found to avoid the overdesign of the EMI filter. Based on the discovered worst case, criteria to ease the DM EMI filter design procedure of the CRM boost PFC are given for different boost inductor selection. Optimized design procedure of the EMI filter for the front-end converter is then discussed. Experiments are carried out to verify the validity of the whole methodology.
Ph. D.
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Mrad, Roberto. "Conducted EMC modeling and EMI filter design integrated class-D amplifiers and power converters." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0019/document.

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Les convertisseurs de puissance sont largement utilisés de nos jours dans des applications qui demandent une grande autonomie énergétique, comme par exemple ceux qui sont alimentés par des batteries. En particulier, les amplificateurs de type Class-D sont fréquemment utilisés dans les applications audio. Ces amplificateurs commutés ont une architecture ressemblante à celle d'un convertisseur DC-DC, ce qui les permet d'avoir une efficacité énergétique élevée. Cependant, leur inconvénient majeur est la forte émission en perturbations électromagnétiques (EM). Cela peut causer des problèmes de conformité avec les normes de compatibilité électromagnétique (CEM), ou bien perturbé le bon fonctionnement des applications électroniques qui l'entour. Pour cela, ils existent de nombreuses études qui permettent de réduire les émissions d'un amplificateur de Class D. Cependant, cela n'est pas suffisant pour retirer le filtre de CEM. Il est donc nécessaire d'optimiser ces filtres et de faciliter leurs conceptions. Ceci est le but de la présente thèse et il est divisé en quatre grandes parties. La première partie commence par développer une technique de modélisation dans le domaine fréquentiel. Cette technique qui est basée sur la détermination et la manipulation des matrices d'impédances a comme but de simuler et prédire les perturbations EM générées par un amplificateur de Class D. Tous les aspects théoriques de la méthode ont été développés. Ensuite, une application pratique sur un système de Class D dédié à la téléphonie mobile nous a permis de valider la méthode jusqu'à une fréquence de 100 MHz. Un amplificateur de Class D est une source de perturbation aussi bien sur les rails d'alimentation que sur les rails de sortie. Pour cela, le filtre de CEM est nécessaire sur les rails de l'alimentation comme il y est en sortie. Néanmoins, un filtre correctement construit doit être conçu en prenant en compte l'impédance de la charge qui est la batterie dans ce cas. Pour cela, la deuxième partie a pour objectif la mesure de l'impédance de la batterie sur la gamme de fréquence considérée. Ainsi, une technique de mesure d'impédance de batterie en utilisant un impédance mètre est développée. Ensuite, une application expérimentale sur un convertisseur DC-DC et une batterie nous a permis de valider la procédure de mesure. La troisième partie s'est focalisée sur l'optimisation du filtre de CEM. Le modèle fréquentiel développé dans la première partie est intégré dans une boucle d'optimisation basée sur un algorithme génétique. L'optimisation inclus plusieurs critères dans sa fonction objective qui sont l'augmentation de la capacité du filtre à réduire les émissions EM, la diminution des pertes supplémentaires due à l'utilisation du filtre et finalement le gain du filtre dans la bande de fréquence du signal audio. Cette étude est poursuivie par une validation expérimentale. La quatrième et la dernière partie étudie et quantifie les impacts du filtre de CEM sur la qualité audio de l'amplificateur. En effet, le filtre de CEM est l'un des chemins propagation du signal audio. Par suite, tout comportement non linéaire du filtre conduit à la distorsion du signal audio. Pour cela, cette partie est dédiée à la modélisation et la simulation des composants passifs contenant un matériau magnétique. En particulier, l'étude s'est focalisée sur la modélisation des perles de ferrite en utilisant le modèle de matériaux magnétiques Jiles-Aterthon. Les résultats de simulations sont comparés avec la mesure dans le domaine temporel et fréquentiel. En plus, le calcul du taux de distorsion harmonique nous a permis de valider le modèle sur une large plage d'amplitude
Switching power management circuits are widely used in battery powered embedded applications in order to increase their autonomy. In particular, for audio applications, Class-D amplifiers are a widespread industrial solution. These, have a similar architecture of a buck converter but having the audio signal as reference. The switching nature of these devices allows us to increase significantly the power efficiency compared to linear audio amplifiers without reducing the audio quality. However, because of the switching behavior, Class-D amplifiers have high levels of electromagnetic (EM) emissions which can disturb the surrounding electronics or might not comply with electromagnetic compatibility (EMC) standards. To overcome this problem much architecture appeared in the state of the art that reduces the emissions, however, this has never been enough to remove electromagnetic interference (EMI) filters. It is then useful to optimize these filters, thus, it has been set as the goal of this PhD thesis. The latter has been divided to four main axes which can be resumed by the following. First, this work started by developing a frequency domain modeling method in order to simulate and predict the EMI of Class-D amplifiers in the final application. The method is based on system to block decomposition and impedance matrix modeling and manipulation. After providing all the theoretical background, the method has been validated on integrated differential Class-D amplifier. The experimental measurements have permitted to validate the method only up to 100MHz. However, this is sufficient to cover the conducted EMC frequency band. Second, the EMI at the supply rails of Class-D amplifiers has been treated. As the battery is often the same power supply for all applications in an embedded system, an EMI filter or a decoupling capacitor is needed to prevent the noise coupling by common impedance. Designing this filter needs the knowledge of the battery impedance at the desired frequencies. Therefore the present work dealt also with measuring the high frequency impedance of a battery. Afterwards, an experimental validation has been carried on with a DC-DC converter and a Class-D amplifier. The developed model allows a virtual test of the switching device in the final application. However, it is more useful if the model is able to help the system integrator in designing filters. Thus, third, the model has been implemented in an optimization loop based on a genetic algorithm in order to optimize the filter response, and also, reduce the additional power losses introduced by an EMI filter. The optimization search space has been limited to the components available on the market and the optimization result is given as component references of the optimal filter referring to the optimal solution found. This procedure has been validated experimentally. Finally, EMI filters often are constituted by magnetic components such as ferrite beads or inductors with magnetic cores. Thus, introducing the EMI filter in the audio path, adds a nonlinear behavior in the audio frequency band. Designing a high quality EMI filter require taking into account this phenomenon and studying its impact of the original amplifier audio performance. Therefore, the Jiles-Atherton model for magnetic materials has been used for ferrite bead modeling. Hereafter, the impact on the time and frequency domain signals has been simulated and compared to measurements. Finally, the total harmonic distortion (THD) has been computed for different signal amplitudes and compared to the THD measured using an audio analyzer. Accurate results have been obtained on a wide range of signal amplitudes. As a conclusion, this work aimed to design optimal EMI filters for Class-D amplifiers. Thus, we dealt with improving their EMI response, reducing their additional power losses and evaluating their impact on the audio quality
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Degano, Marco. "EMI filter design for matrix converters in airspace applications." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12744/.

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Advanced power electronics systems are increasingly being used for AC motor drives, due to their numerous advantages in terms of performance and flexibility; however, due to their switching behaviour, they introduce significant harmonic content. To reduce any interaction with other appliances suitable EMI filters need to be designed and implemented. The focus of this thesis is on the characterization of a matrix converter induction motor drive for aerospace application from the point of view of EMI interference and on the design and implementation of suitable filtering systems. Concerns about Electro Magnetic Interferences are particularly justified in the light of the fact that high reliability is sought after in such applications. The main interest in this work lies in the electromagnetic regulations defining the allowable conducted emissions in the frequencies between 150 kHz and 30 MHz. The first goal achieved by this work is to characterize the EMI signature of a matrix converter induction motor drive using common and differential mode measurements of the converter and motor impedances separately. Based only on these measurements the project aims to synthesize accurate HF models for the Induction Motor and the Matrix Converter in common and differential mode, without the need of deep level studies that may involve long Finite Elements (FE) simulations of the physical system characteristics. This thesis proposes two general novel HF models for Matrix Converters and Induction Motors that could also be applied in any other application or operating condition. These models are automatically tuned and optimized by a suitably developed Genetic Algorithm (GA) routine capable to match those models with real experimental measurements. This thesis reports the methodologies used for both input and output filter design, together with description and analysis of some issues encountered during the process.
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7

Sedlák, Milan. "Anténní předzesilovač pro měření EMI." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376954.

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The master thesis deals with the design of a low noise preamplifier operating in the frequency range from 30 MHz to 1 GHz, usable for measuring and testing of electromagnetic interference in the electromagnetic compatibility test rooms. The introductory, theoretical, part is focused on the analysis and description of the necessary properties of the low noise preamplifier required for the subsequent design. The practical part deals with the selection of suitable components, simulation, design and subsequent realization of low noise preamplifier. At the end of the thesis the design and the final verification measurements are described and discussed.
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8

Chen, Rengang. "Integrated EMI Filters for Switch Mode Power Supplies." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/25992.

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Because of the switching action, power electronics converters are potentially large EMI noise sources to nearby equipment. EMI filters are necessary to ensure electromagnetic compatibility. Conventional discrete EMI filters usually consist of a large number of components, with different shapes, sizes and form factors. The manufacturing of these components requires different processing and packaging technologies, of which many include labor-intensive processing steps. In addition, due to the parasitics of discrete components, high-frequency attenuation of the filter is reduced and the effective filter frequency range is limited. As a result, discrete EMI filters are usually bulky, high profile, and have poor high-frequency performance. With an aim to solving these issues, this study explores the integration of EMI filters. The goal is to achieve a smaller size, lower profile, better performance and reduced fabrication time and cost via structural, functional and processing integration. The key technology for EMI filter integration is planar electromagnetic integration, which has been a topic of research over the last few years. Most of the previous applications of this technology for switch mode power supplies (SMPSs) were focused on the integration of high frequency power passive electromagnetic components, such as HF transformers, resonant/choke inductors and resonant/blocking capacitors. Almost no work has been done on the subject of EMI filter integration. Since the major function of EMI filters is to attenuate, instead of propagate, energy at the switching frequency and its harmonics, the required technology and design objectives are very different from those of other components. High-frequency modeling of the integrated structure becomes more essential since the high-frequency performance becomes the major concern. New technology and a new model need to be developed for EMI filter integration. To bridge this gap between existing technologies and what is necessary for EMI filter integration, this dissertation addresses technologies and modeling of integrated EMI filters. Suitable integration technologies are developed, which include reducing the equivalent series inductance (ESL) and equivalent parallel capacitance (EPC), and increasing, instead of reducing, the high frequency losses. Using the multi-conductor lossy transmission-line theory, a new frequency domain model of integrated LC structure is developed and verified by experimental results. Through detailed electromagnetic analysis, the equations to calculate the required model parameters are derived. With the developed frequency domain and electromagnetic model, the characteristic of integrated LC modules can be predicted using geometry and material data. With the knowledge obtained from preliminary experimental study of two integrated EMI filter prototypes, a technology is developed to cancel structural winding capacitance of filter inductors. This can be realized by simply embedding a thin conductive shield layer between the inductor windings. With the resultant equivalent circuit and structural winding capacitance model, optimal design of the shield layer is achieved so that EPC can be almost completely cancelled. Applying this technology, an improved integrated EMI filter with a much simpler structure, a much smaller size and profile, and much better HF performance is designed, constructed and verified by experiment. The completed parametric and sensitivity study shows that this is potentially a very suitable technology for mass production. The integrated RF EMI filter is studied, as well. Its frequency domain model is developed based on multi-conductor lossy transmission-line theory. With the model parameters extracted from the finite element analysis (FEA) tool and the characterized material properties, the predicted filter characteristic complies very well with that of the actual measurement. This model and modeling methodology are successfully extended to study the RF CM&DM EMI filter structure, which has not been done before. To model more complicated structures, and to study the interaction between the RF EMI filter and its peripheral circuitry, a PSpice model with frequency dependent parameters is given. Combining the structural winding capacitance cancellation and the integrated RF CM&DM EMI filter technologies, a new integrated EMI filter structure is proposed. The calculation results show that it has the merits of the two employed technologies, hence it will have the best overall performance.
Ph. D.
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Stojanovic, Marine. "Study and modeling of inter-component coupling for filtrer design : Application to automotive EMI filters." Thesis, Rennes, INSA, 2018. http://www.theses.fr/2018ISAR0014/document.

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La CEM (Compatibilité ElectroMagnétique) est de plus en plus importante dans la conception des systèmes électroniques et plus particulièrement dans le domaine automobile. En effet, avec la densification de l’électronique dans les véhicules, les problèmes liés à la CEM sont de plus en plus fréquents. Ainsi, afin de limiter ces interférences électromagnétiques, des filtres correctement dimensionnés et implémentés doivent être utilisés. Chaque filtre est dimensionné en tenant compte de l’environnement dans lequel il va être introduit. Cependant, de nombreux facteurs peuvent altérer ses performances, tel que le routage, la structure mécanique ou bien les couplages internes au filtre, entre les composants eux-mêmes. Cette thèse traite de l’étude de l’influence des couplages inter-composants sur les performances d’un filtre pour la CEM. En effet, les méthodes existantes sont basées uniquement sur des simulations électromagnétiques 3D qui sont couteuses en terme de temps et requiert également un trop grand nombre d’informations sur les composants (propriétés géométriques, des matériaux etc.). Ainsi, une méthode uniquement basée sur des calculs analytiques et exploitations de mesures a été développée. Cette méthode simplifiée est très efficace car elle permet la prédiction des performances d’un filtre, quelle que soit sa topologie et quelle que soit sa structure. Cette méthode a été validée via de nombreux cas d’applications de filtres implémentés sur des systèmes d’électronique de puissance du domaine automobile. Finalement, cette méthode a été capitalisée au travers d’un outil pour le design et la prédiction des performances de filtre pour la CEM en tenant compte de la proximité des composants
EMC (ElectroMagnetic Compatibility) is increasingly important in electronic and electrical systems and more particularly in the automotive domain. Actually, there are more and more power electronics equipments in a vehicle and, therefore, EMC issues are more recurrent. In order to limit EMI (ElectroMagnetic Interferences), well designed filters are needed. Each filter is designed corresponding to a system and the required attenuation. However, different parameters can have influence on the filter performances, such as the layout, the mechanical structure or the inter-components coupling of the filter. Therefore, the thesis work is based on the study of the filter performance considering inter-components coupling. Some methods exist on that topic bu are generally based on 3D electromagnetic simulation, which is time-consuming and requires a lot of information on components (geometrical properties, material properties etc.). Therefore, our work is based on a methodology only based on analytical calculation and measurements. That simplified methodology is very accurate because it can predict a filter performance, whatever the filter topology, whatever the structure. That method was validated under several application cases on power electronics systems for automotive domain. Finally, the whole methodology has been accrued in a tool for filter design that can predict a filter attenuation by considering the components proximity
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Zhang, Dongbing. "Switching mode power supply noise source impedance measurement and EMI filter characterization." Thesis, Virginia Polytechnic Institute and State University, 1996. http://hdl.handle.net/10919/51922.

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The effectiveness of an EMI filter is closely related to the impedance of the noise source. Due to the time-varying nature of the noise source impedance of an offline power supply, the measurement of it cannot be done using conventional impedance measuring methods. Two new methods, the insertion loss method and the signal injection method, are proposed to perform such a measurement. The insertion loss method utilizes the EMI emission as a signal source and derives the source impedance by measuring the emission attenuation caused by an inserted impedance. The signal injection method injects a signal to the power supply and measures the response. The insertion loss method is verified experimentally both for common mode and differential mode, The signal injection method for common mode source impedance measurement is experimentally verified. That for differential mode source impedance measurement requires a faster equipment and is not fully verified. An EMI filter is usually characterized in the manufacturer’s catalog by its attenuation in a standard system (50Ω source impedance and 50Ω load impedance). The effectiveness of the filter in a practical system may significantly deviate from the manufacturer’s data. To provide the users with practically useful information, a scheme to characterize the EMI filter, the impedance matrix approach is proposed. This approach takes parasitic effect into consideration and the parameters can be measured relatively easily. The approach is verified experimentally by applying a commercial EMI filter to a power supply and comparing the predicted attenuation with the measured one.
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Books on the topic "EMI Filter"

1

Ozenbaugh, Richard Lee. EMI filter design. New York: Marcel Dekker, 1996.

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M, Pullen Timothy, ed. EMI filter design. 3rd ed. Boca Raton, FL: Taylor & Francis, 2012.

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Elektronik, Würth, ed. Trilogy of magnetics: Design guide for EMI filter design, SMPS & RF circuits. 4th ed. Waldenburg, Germany: Würth Elektronik, 2010.

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S, Kim Michael, Holcomb Franklin H, and Construction Engineering Research Laboratories (U.S.), eds. Effects of harmonics on EMI/RFI filters operating under nonlinear loading conditions. [Champaign, IL]: US Army Corps of Engineers, Construction Engineering Research Laboratories, 1993.

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United States. Environmental Protection Agency, ed. Membrane microfiltration: E.I. DuPont de Nemours and Company, Inc., Oberlin Filter Company. [Washington, D.C.]: U.S. Environmental Protection Agency, [1991], 1991.

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Corporation, Concurrent Technologies, and National Electronic Commerce Resource Center., eds. EDI integration and mapping guidelines. Johnstown, Pa. (1450 Scalp Ave., Johnstown 15904): Concurrent Technologies Corp., 1997.

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Ozenbaugh, Richard Lee, and Timothy M. Pullen. EMI Filter Design. Taylor & Francis Group, 2017.

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Ozenbaugh, Richard Lee, and Timothy M. Pullen. EMI Filter Design. Taylor & Francis Group, 2017.

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Ozenbaugh, Richard Lee, and Timothy M. Pullen. EMI Filter Design. Taylor & Francis Group, 2017.

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Ozenbaugh, Richard Lee. EMI Filter Design. Taylor & Francis Group, 2000.

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Book chapters on the topic "EMI Filter"

1

Ashok Kumar, L., and Y. Uma Maheswari. "EMI Filter." In Electromagnetic Interference and Electromagnetic Compatibility, 95–126. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003362951-3.

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Archambeault, Bruce R. "EMC Filter Design." In PCB Design for Real-World EMI Control, 151–70. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3640-3_9.

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Ou, Jianchang, Mengyuan Lv, and Li Zhai. "Exploration of Adaptive Principle EMI Filter." In Lecture Notes in Electrical Engineering, 113–23. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2730-2_12.

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Keller, Reto B. "Components." In Design for Electromagnetic Compatibility--In a Nutshell, 145–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_11.

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AbstractIn order to choose the right components for EMI filters, it is essential to understand the properties and nonideal behavior of passive filter components. Therefore, in this chapter, the high-frequency behavior and other undesirable effects of conductors (wires, cables, PCB traces), resistors, capacitors, inductors, ferrite beads, common-mode chokes, baluns, varistors, and TVS diodes are presented.
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Ruan, Xinbo, Lihong Xie, Qing Ji, and Xibo Yuan. "Measurement of Conducted Electro-magnetic Interference (EMI) and Design of EMI Filter." In CPSS Power Electronics Series, 25–38. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9295-9_2.

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Fan, Li, and Fei Xia. "The Impedance Mismatching on the EMI Power Filter Design." In Future Computing, Communication, Control and Management, 699–704. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27326-1_90.

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Khelladi, S., K. Saci, A. Hadjadj, A. Ales, Z. Chebbat, and A. Layoune. "Experimental EMC Qualification Test of an EMI Filter for a DC-DC Converter Intended to Smart Grid Applications." In Lecture Notes in Networks and Systems, 632–40. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37207-1_68.

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Vedde, Achim, Martin Neuburger, Konstantin Spanos, and Hans-Christian Reuss. "Optimization of EMI Filter with Consideration of the Noise Source Impedance for DC/DC Converter." In Proceedings, 167–78. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-33466-6_12.

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Keller, Reto B. "Filtering." In Design for Electromagnetic Compatibility--In a Nutshell, 245–63. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_15.

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AbstractIn EMC, filtering helps to minimize emissions of a product and increase the product’s immunity against electromagnetic interference. This chapter presents the concepts of determining the right filter type and ensuring the proper components are chosen regarding power dissipation, noise current type, and high-frequency behavior.Filters can be classified according to their attenuation in the frequency-domain: Low-pass filters High-pass filters Band-pass filters Band-stop filters or according to active components involved or not: Passive filters Active filters or according to the noise current type: Differential-mode noise filters Common-mode noise filters or according to the suppression of transients: ESD filters Burst filters Surge filters or according to the implementation in hardware or software: Analog filters (hardware) Digital filters (software) In this chapter, all the filter types listed above are explained in further detail.
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Zhang, Xin, Jinsong He, Hao Ma, Zhixun Ma, and Xiaohai Ge. "Composite-Bisection Predictive Control to Stabilize the Three Phase Inverter Cascaded with Input EMI Filter in the SPS." In Stability Enhancement Methods of Inverters Based on Lyapunov Function, Predictive Control, and Reinforcement Learning, 127–50. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7191-4_7.

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Conference papers on the topic "EMI Filter"

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Yang, Peng, Yechi Zhang, Caichao Shao, Dong Deng, and Yang Liu. "Design of Active EMI Filter for CM EMI Suppression with Cascaded Structure." In 2024 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific), 829–32. IEEE, 2024. http://dx.doi.org/10.1109/itecasia-pacific63159.2024.10738665.

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Chengchao, Hua, Huang Chen, Yang Chunyu, and Yang Peng. "A Hybrid EMI Filter for CM EMI Suppression in DC-DC Converter." In 2024 14th International Symposium on Antennas, Propagation and EM Theory (ISAPE), 1–3. IEEE, 2024. https://doi.org/10.1109/isape62431.2024.10841214.

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Leferink, Frank, Hans Bergsma, Braham Ferreira, and Wim van Etten. "High Performance EMI Filter for Frequency Converters." In 2004_EMC-Europe_Eindhoven, 1–3. IEEE, 2004. https://doi.org/10.23919/emc.2004.10805825.

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Koch, Patrick, Daria Nemashkalo, Niek Moonen, and Frank Leferink. "Multichannel EMI Filter Performance Assessment by Mix Mode Injection." In 2024 International Symposium on Electromagnetic Compatibility – EMC Europe, 991–96. IEEE, 2024. http://dx.doi.org/10.1109/emceurope59828.2024.10722108.

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Roc'h, Anne, Hans Bergsma, Frank Leferink, Dongsheng Zhao, Henk Polinder, and Braham Ferreira. "Design of an EMI Output Filter for Frequency Converters." In 2006_EMC-Europe_Barcelona, 1–5. IEEE, 2006. https://doi.org/10.23919/emc.2006.10813093.

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Li, Hong, Daozhen He, Siyi Wang, and Zhenyu Zhao. "Active X-Y Capacitors Based Hybrid EMI Filter Design." In 2024 2nd China Power Supply Society Electromagnetic Compatibility Conference (CPEMC), 338–42. IEEE, 2024. https://doi.org/10.1109/cpemc65359.2024.00072.

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Eberl, Jan, and Jan Hansen. "Design of a High-Voltage EMI Filter Using Virtual Reality." In 2024 International Symposium on Electromagnetic Compatibility – EMC Europe, 1094–99. IEEE, 2024. http://dx.doi.org/10.1109/emceurope59828.2024.10722531.

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Brehaut, Stéphane, Jean-Charles Le Bunetel, Didier Magnon, Antoine Puzo, Alfonso Santolaria, David González, Javier Gago, and Josep Balcells. "Interactions between an Input EMI Filter and a Power Supply." In 16th International Zurich Symposium and Technical Exposition on Electromagnetic Compatibility, 503–6. IEEE, 2005. https://doi.org/10.23919/emc.2005.10806347.

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Alizadeh, Abdolhadi, Vadim Bakiko, Vladimir Shvaichenko, and Anna Vlasyuk. "Features of Power-Line Impedance Effects on EMI Filter Performance." In 2010_EMC-Europe_Wroclaw, 804–9. IEEE, 2010. https://doi.org/10.23919/emc.2010.10826285.

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Zhang, Junzhao, Dong Jiang, Jianrui Liu, and Yechi Zhang. "A Virtual Capacitor Based Transformerless Active Common-Mode EMI Filter." In 2024 IEEE Energy Conversion Congress and Exposition (ECCE), 4845–50. IEEE, 2024. https://doi.org/10.1109/ecce55643.2024.10860975.

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Reports on the topic "EMI Filter"

1

Hull, Jonathan P. Broadband EMP Transient Measurement Preemphasis Filter. Fort Belvoir, VA: Defense Technical Information Center, February 1992. http://dx.doi.org/10.21236/ada254414.

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Giurgiutiu, Victor, and Jingjing Bao. PWAS EMIS-ECIS Active Carbon Filter Residual Life Estimation Methodology. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada617286.

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Alonso, Daniel. Stabilisation properties of a sure-like European unemployment insurance. Madrid: Banco de España, June 2024. http://dx.doi.org/10.53479/36654.

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To moderate the falls in production and income that affect certain states or regions, countries and monetary unions have risk-sharing mechanisms. These mechanisms work by stabilising household incomes such that fluctuations in production do not filter through to consumption. Almost all existing monetary unions are true insurance unions, except for the euro area. This entails lower resilience to economic shocks and, as demonstrated during the COVID-19 crisis, implies that the ability to respond to different shocks may differ between countries and, therefore, hinder economic convergence and homogeneous operation of the euro area. In this regard, the creation of a European Unemployment Insurance (EUI) scheme is often cited as an important step towards macroeconomic smoothing within the euro area that could help mitigate the economic and social impact of large economic shocks. In this paper, I propose an EUI scheme, with partial coverage, calibrated to the characteristics of the Temporary Support to Mitigate Unemployment Risks in an Emergency (SURE scheme) introduced during the COVID-19 crisis, and test its cyclical properties through simulation exercises, based on the payment and contribution flows in each country. This paper shows that such a transfer system with a relatively limited size could make a significant contribution to stabilising economic developments, cushioning part of the disruptions in times of crisis.
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Sakulneya, Apidej, and Jeffery Roesler. Smart Construction Work-Zone Safety with V2I Passive Material Sensing. Illinois Center for Transportation, December 2024. https://doi.org/10.36501/0197-9191/24-027.

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This study explored new vehicle to infrastructure (V2I) technology in construction work zones (CWZ), where speeding, unsafe driving behaviors, and drivers' failure to obey traffic signs contribute significantly to elevated accident rates and fatalities. The objective of this research to advance CWZ safety by evaluating the potential of 3-axis magnetometers attached to a moving cart and traversing over a pavement-assisted passive sensing system can improve vehicle lateral positioning and warning in CWZ. Secondly, to develop a process to implement a programmable ferromagnetic oxide material for roadway coatings to interface with vehicles containing magnetometers on a field site. The research testing used a custom-built cart equipped with multiple 3-axis magnetometer to detect EM signals from invisible markings composed of 10% and 20% CrO₂, that were created to alert for speed, lane merges, and lane-keeping. The invisible marking strips were oriented and positioned in various ways to test the repeatability and ability to reliable detect a signal and signature that could be interpreted with automated algorithm. The experimental test results were acquired in a parking and signal-processing technique was established that normalized the raw signals, removed background EM signals not related to the created EM signatures, filtered high- and low-frequency noise, and took the derivative of the EM flux density with respect to the number of points. The V2I signals in the Y and Z-axes occasionally failed to exceed the minimum threshold set for the experiments, but the X-axis signals consistently exceeded the minimum value of ±200nT throughout the testing. The minimum threshold signals were used to calculate the speed of the cart, indicate a lane merge, and determine the lateral lane position of the cart. The detected speed signals closely correlated with the GPS speed measurements on the cart as well as provided accurate cart positioning and maneuvering actions. This pilot study demonstrated the potential of V2I communication specifically EM pavement signatures to enhance CWZ safety and provide detectable and actionable feedback to the vehicle.
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Jameel, Yusuf, Paul West, and Daniel Jasper. Reducing Black Carbon: A Triple Win for Climate, Health, and Well-Being. Project Drawdown, November 2023. http://dx.doi.org/10.55789/y2c0k2p3.

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Black carbon – also referred to as soot – is a particulate matter that results from the incomplete combustion of fossil fuels and biomass. As a major air and climate pollutant, black carbon (BC) emissions have widespread adverse effects on human health and climate change. Globally, exposure to unhealthy levels of particulate matter, including BC, is estimated to cause between three and six million excess deaths every year. These health impacts – and the related economic losses – are felt disproportionately by those living in low- and middle-income countries. Furthermore, BC is a potent greenhouse gas with a short-term global warming potential well beyond carbon dioxide and methane. Worse still, it is often deposited on sea ice and glaciers, reducing reflectivity and accelerating melting, particularly in the Arctic and Himalayas. Therefore, reducing BC emissions results in a triple win, mitigating climate change, improving the lives of more than two billion people currently exposed to unclean air, and saving trillions of dollars in economic losses. Today, the majority of BC emissions stem from just a handful of sectors and countries. Over 70% of BC comes from the residential and transportation sectors, with the latter being the dominant source in high-income countries and the former driving emissions in low- and middle-income nations. On a country-level, China and India are the biggest emitters accounting for one-third of global BC emissions. When combined with Brazil, Indonesia, and Nigeria, these five countries alone emit 50% of all BC. While BC emissions trends over the past 20 years have been inconsistent globally, there has been a notable decline in Europe, North America, and China. Conversely, emissions have been rising in regions like Africa, South Asia, and Central Asia. The Intergovernmental Panel on Climate Change recommends deep reductions in BC emissions by 2030 to achieve the Paris Climate Agreement goal of limiting warming to below 1.5°C, yet very few countries have addressed BC in their climate plans. Fortunately, solutions that can rapidly reduce BC emissions by the end of this decade are readily available. By implementing the right policies, deploying targeted interventions in hotspots, and redirecting climate finance, policymakers and funders can mitigate the climate effects of BC while saving millions of lives and trillions of dollars. Below are key recommendations to achieve these aims based on the findings of this report: Urgently implement clean cooking solutions Providing clean cooking fuels and technologies in sub-Saharan Africa and South Asia, especially in the hotspots of the Indo-Gangetic Plains, Nigeria, and Uganda, can significantly reduce BC emissions. Countries with low penetration of clean cooking fuel must urgently develop policies that make clean cooking a priority for health and climate. Target transportation to reduce current – and prevent future – emissions Retrofitting older diesel engines with diesel particulate filters can remove up to 95% of BC. Countries around the world must implement policies to phase out polluting vehicles, set emission standards, and accelerate the uptake of EVs and hybrids, especially in urban regions where transportation demand is growing rapidly. A successful shift to EVs demands national investments complemented with international financing and private capital. Multilateral development banks need to play a pivotal role in this transition, with strategies like concessional finance to fast-track key projects and stimulate private sector investment. Reduce BC from the shipping industry BC emissions from the shipping industry must be urgently reduced to protect the Arctic ecosystem. Shifting shipping away from heavy fuel oil and equipping ships with diesel particulate filters is a cost-effective approach that would quickly and significantly reduce emissions. Regulate air quality Stringent emissions standards, clean air laws, baselines, and mandatory monitoring programs can effectively reduce BC emissions. Such policies have already resulted in large reductions in Europe, North America, and, more recently, China. However, several low- and middle-income countries have no legal protection for ambient air quality and lack legislatively-mandated standards. Implementing strong and legally binding policies can result in a large decrease in BC emissions, particularly across the transportation and industry sectors. Include BC in nationally determined contributions and the UNFCCC Only 12 countries have explicitly addressed BC in their nationally determined contributions (NDCs). This limited focus on BC is partly due to its omission from the United Nations Framework Convention on Climate Change’s (UNFCCC) list of climate pollutants, an oversight that should be reconsidered given that reducing BC would save countless lives and slow global warming. As nations review their NDCs by 2025, they must incorporate BC reduction efforts to meet climate and well-being targets. Improve BC measurements and estimates BC estimates are plagued by uncertainties. Therefore, there is an urgent need for more accurate inventories in order to develop better emission reduction plans. Stakeholders must collaborate to develop a consistent BC measurement protocol, prioritize the collection of high-quality data, and use state of the art models to enhance estimates and reduce uncertainties.
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