Search results for "electromagnetic interference"

showing 10 items of 34 documents

Computer Aided Optimal Design of High Power Density EMI Filters

2016

Power density of power converter systems is becoming an increasingly stringent design constraint for a wide range of applications. Size reduction of EMI filter in power converters is an important aspect due to its significant impact on the overall converter volume and weight. In order to take on this issue, a computer aided procedure for a fast selection of optimal discrete EMI filter components and configuration is described in this paper. The proposed technique is a rule-based automatic procedure based on suitable databases that consider datasheets information of commercially available passive components (e.g. magnetic cores, capacitors). It allows the minimization of the filter's volume …

Optimal designEngineeringEMI filterSwitched-mode power supplyEnergy Engineering and Power Technology02 engineering and technologySettore ING-INF/01 - ElettronicaElectromagnetic interferencelaw.inventionEMIlaw0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringPower densitybusiness.industryRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringElectrical engineering020206 networking & telecommunicationsPower converterPower (physics)Power densityCapacitorSettore ING-IND/31 - ElettrotecnicaFilter (video)visual_artElectronic componentvisual_art.visual_art_mediumbusiness
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Design of EMI Filters Using Multi-Objective Optimization

2018

A multi-objective design procedure for EMI filters in power converters is proposed. In a first step, the results obtained by an automatic design of EMI filters for power electronic converters oriented to satisfy the electromagnetic compatibility standards and the power density constraint which impose the minimization of the filter volume and/or weight, are evaluated. In a second step, the power losses and the cost related to the EMI filter configurations are estimated. By using the dominance concept, the EMI filter designs which are part of the Pareto front are selected among a discrete set of feasible configurations. Therefore, the configurations of the Pareto front take into consideration…

Optimization010302 applied physicsMotor driveComputer scienceMathematics::History and Overview020208 electrical & electronic engineeringElectromagnetic compatibility02 engineering and technologyConverters01 natural sciencesMulti-objective optimizationElectromagnetic interferencePower (physics)Settore ING-IND/31 - ElettrotecnicaSettore MAT/08 - Analisi NumericaFilter designFilter (video)EMIFilter design0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectromagnetic compatibility2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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NTD-GE-based microcalorimeter performance

2000

Our group has been developing x-ray microcalorimeters consisting of neutron transmutation doped (NTD) germanium thermistors attached to superconducting tin absorbers. We discuss the performance of single pixel x-ray detectors, and describe an array technology. In this paper we describe the read-out circuit that allows us to measure fast signals in our detectors as this will be important in understanding the primary cause of resolution broadening. We describe briefly a multiplexing scheme that allows a number of different calorimeters to be read out using a single JFET. We list the possible causes of broadening and give a description of the experiment which best demonstrates the cause of the…

PhysicsNuclear and High Energy PhysicsNuclear transmutationPhysics::Instrumentation and Detectorsbusiness.industryDetectorX-ray detectorchemistry.chemical_elementJFETGermaniumMultiplexingElectromagnetic interferenceSettore FIS/05 - Astronomia E AstrofisicaOpticschemistryOptoelectronicsNeutronbusinessInstrumentationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Design and performance evaluation of a high power density EMI filter for PWM inverter-fed induction motor drives

2015

This paper presents the design of an electromagnetic interference (EMI) filter for a low voltage high current induction motor drives supplied by DC power grids, such as those used in several vehicle applications. In order to effectively design the EMI filter a suitable Common Mode/Differential Mode (CM/DM) separation technique has been used. In consideration of the high operating currents, a software based separation technique using time domain measurements has been applied. The proposed technique allows the CM and DM sections of the EMI filter to be properly selected in a more economical way, i.e. without the need of dedicated hardware or costly radio frequency (RF) instrumentation. The de…

Power DensityEngineeringEMI filterMotor drivebusiness.industryElectrical engineeringEnergy Engineering and Power TechnologyElectromagnetic interferenceCM and DM separation techniquesMotor driveSettore ING-IND/31 - ElettrotecnicaFilter (video)EMIElectronic engineeringCommon-mode signalCM and DM separation techniqueElectrical and Electronic EngineeringbusinessLow voltageInduction motorPulse-width modulation
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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EMI Filter Re-Design in a SMPS with Inductor in Saturation

2021

This paper analyzes the design issues of the input EMI (Electro-Magnetic Interference) filter's in a switching mode power supply where the power inductor is operated in saturation. Starting with a SMPS equipped with linear inductor, the input filter is firstly designed to comply with Standards. Then, a new inductor with a smaller core size is employed in the same SMPS to exploit saturation. The EMI filter is re-designed, taking into account the increase of EMI introduced by the non-linear operation of the inductor. Finally, the reduction of the inductor's size and cost is compared with the increased size and cost of the EMI filter.

Switched-mode power supplyComputer sciencebusiness.industryElectrical engineeringElectromagnetic interference (EMI) filter Switched Mode Power Supply power density nonlinear magnetics saturable core inductor.power densityInductorInterference (wave propagation)Settore ING-INF/01 - ElettronicainductorElectromagnetic interferencePower (physics)EMIFilter (video)Hardware_GENERALsaturable coreHardware_INTEGRATEDCIRCUITSnonlinear magneticsPower engineeringelectromagnetic interference (EMI) filterbusinessSwitched Mode Power Supply
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Analysis of EMI Shielding Effectiveness for plastic fiber composites in the 5G sub-6 GHz band

2021

The study and modeling of EMC are becoming more critical than ever due to the ubiquitous presence of electronic circuits in all aspects of our lives. Specifically, it is crucial to extend these studies to the new frequencies that, in a few years, will be a reality in modern telecommunications systems, such as 5G and its derived technologies. A specific critical field where the proper EMI shielding has been ensured to avoid EMC problems is the electric autonomous vehicles (EAVs). The huge number of electronics systems in new vehicles will dramatically extend the demands on the EMI shielding solutions used to attenuate the radiated emissions that could affect circuits in the vehicle. Metals o…

VibrationFlexibility (engineering)Computer scienceEMIElectromagnetic shieldingElectromagnetic compatibilityElectronicsComposite materialElectromagnetic interferenceElectronic circuit2021 IEEE International Joint EMC/SI/PI and EMC Europe Symposium
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Recent Advances and Future Directions of Microwave Photonic Radars: A Review

2021

Microwave photonic (MWP) radar has the advantages of generating and processing wide bandwidth microwave signals, reconfigurability, high immunity to electromagnetic interference compared to microwave electronic radar. It has the potential to be used in applications such as intelligent autonomous and cyber-physical systems. Recent advances in microwave photonic technology led to the generation, fast processing, and control of broadband signals. Because of the advancements in photonic technologies, next-generation microwave photonic radar is becoming more prominent. This article reviews the most recent advancements and future directions in MWP radars. This review article overviews the differe…

business.industryComputer scienceComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONReconfigurabilityComputerApplications_COMPUTERSINOTHERSYSTEMSElectromagnetic interferencelaw.inventionMicrowave imaginglawRadar imagingBroadbandElectronic engineeringElectrical and Electronic EngineeringRadarPhotonicsbusinessInstrumentationPhysics::Atmospheric and Oceanic PhysicsMicrowaveIEEE Sensors Journal
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A prototypal PCB board for the EMI characterization of SiC-based innovative switching devices

2020

In this paper, a preliminary PCB board for the electromagnetic interference (EMI) characterization of innovative silicon-carbide (SiC) based switching devices is presented. Packaging technological issues can determine hurdles in the high-frequency switching and high power regime where wide band gap semiconductors are intended today for Electric Vehicle (EV) applications. In particular, the parasitic inductances that emerge in such devices, must be assessed, by using e.g. EMI techniques. In this specific case, the EMI characterization is supposed to be carried out in a semi-anechoic chamber, available at the University of Palermo (UNIPA), to assess the electromagnetic disturbances according …

business.product_categoryComputer science020209 energy02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricicomputer.software_genreSettore ING-INF/01 - Elettronica7. Clean energyElectromagnetic interferencePrinted circuit boardEMIElectric vehicle0202 electrical engineering electronic engineering information engineeringelectromagnetic compatibilityelectric vehiclesPage layoutbusiness.industry020208 electrical & electronic engineeringElectrical engineeringElectromagnetic compatibilitySiC deviceElectromagnetic interferencePower (physics)Settore ING-IND/31 - ElettrotecnicabusinesscomputerVoltage
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Novel nanocrystalline cores for EMI suppression in cables: characterization methodology and performance study

2021

El control de las interferencias electromagnéticas (EMI) en dispositivos electrónicos es un problema cada vez mayor al que se enfrentan los diseñadores para garantizar que los dispositivos cumplan con los requisitos de compatibilidad electromagnética (EMC) para operar simultáneamente sin inferir entre sí. Este hecho se debe a la tendencia hacia una mayor integración de componentes, la reducción del tamaño y grosor de las placas de circuito impreso (PCB) y la miniaturización de las carcasas de los dispositivos. Además, otros factores como el empleo de frecuencias de conmutación más altas en los convertidores de potencia y las velocidades de datos de comunicación en los circuitos digitales. C…

cable filtering:CIENCIAS TECNOLÓGICAS [UNESCO]ceramic materialsinsertion lossimpedancerelative permeabilitynanocrystallinefinite element method simulationUNESCO::CIENCIAS TECNOLÓGICASelectromagnetic compatibilityelectromagnetic interference suppressors
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