2007 ieee international symposium on electromagnetic compatibility

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26EMC <strong>2007</strong> ADVANCE PROGRAMusing a noise separator. A design example is carried out experimentallyon the implemented filter according to EN 55022 Class B toverify the validity of the design procedure.SPECIAL SESSION: AUTOMOTIVE EMC DESIGN AND MODELINGCircuit Board Layout for Automotive ElectronicsTodd Hubing, Clemson UniversityEMC and environmental requirements placed on automotive electronicspresent unique board layout challenges. This paper discussescomponent placement and trace routing strategies for circuit boardsthat will be used in automotive applications.Modeling Coax Cable EMI Shielding Performance forAutomotive AM Broadcast Band ApplicationsRichard Wiese, General MotorsAutomotive broadcast reception systems typically use common coaxcable to convey RF energy from the antenna to the broadcast receiver.In special cases a modified low capacitance coax is used for crossvehicle runs to enhance performance in the AM band. Coax is specifiedby characteristic impedance, optical coverage, DC resistance perunit length, and RF loss versus frequency per unit length. Opticalcoverage and DC resistance serve to provide a gauge for relativeshielding performance to EMI. EMI currents on the shield translateto an impressed voltage at the receiver via the transfer impedance ofthe coax. This paper examines the near-field magnetic shieldingeffectiveness of coax and the relationship to standard methods forshielding effectiveness. A 2-D quasi-static solver application is usedfor the analysis.Validation of Worst-Case and Statistical Models for anAutomotive EMC Expert SystemDaryl Beetner, University of Missouri-Rolla; Haixiao Weng, TexasInstruments; Todd Hubing, Clemson University; and Meilin Wu, Universityof Missouri-RollaAn EMC expert system has been developed to predict potentialelectromagnetic compatibility problems in a vehicle early in thedesign process. Here, the accuracy of inductive and capacitivecoupling algorithms are verified through representative measurementsof crosstalk within an automobile. Worst-case estimatesused by the algorithms are compared to measured valuesand are compared to values estimated using statistical methods.While an approximate statistical approach is feasible even forsophisticated designs, worst-case estimates better ensure thatproblems will not be missed even in the absence of complete systeminformation.Impact of Intra-Vehicular Electromagnetic Interference onTire Pressure Monitoring SystemsVikas Kukshya, HRL Laboratories; Hyok Song, N/A; Hui P. Hsu, N/A;and Richard Wiese, General MotorsThe next generation of vehicles will use a wide range of electronicsensors and systems to monitor and regulate various vehicular performanceand safety functions. However, before such systems canbe formally introduced in the vehicles, it is crucial that the potentialimpact of vehicular electromagnetic interference on these systemsbe evaluated thoroughly. In this paper, we use an end-to-endsystem simulator to quantify the impact of various levels and typesof electromagnetic interference in a typical vehicular environmenton the performance of a direct measurement Tire PressureMonitoring System.International Electrotechnical Commission DocumentsCISPR 12 and CISPR 25: An OverviewPoul Andersen, ConsultantThis document presents an overview of CISPR 12 and CISPR 25 anddiscusses some of the changes being made in the new edition of eachdocument currently in the balloting process.Vehicle EMI Integration Issues Identified by PrecomplianceTest MethodsScott Mee; Sreeniwas Ranganathan; Craig Harder; and Steve Mainville, —Johnson Controls Inc.Automotive electronics systems are becoming increasingly complexeach year. At the same time, interior styling and exterior body trendsare causing these sophisticated electronics to be packaged in smallerspaces. As a result, vehicle integration testing has been a focus areafor Original Equipment Manufacturers (OEMs) to ensure there isadequate evaluation of such systems prior to mass production.Vehicle level integration testing requires time and extensiveresources to perform. The need for performing additional vehicletesting and correcting integration issues can be avoided by performingearly precompliance testing. This paper discusses five uniqueprecompliance test methods that correlate to the vehicle that identifyEMC issues.Evaluating Cell Phone and Personal CommunicationsEquipment and Their EMC Effects on Automotive Audio andIn-Cabin ComponentsCraig Fanning, Elite Electronic Engineering IncThe purpose of this R&D project was to evaluate current andfuture personal communications technologies and their potentialeffect on vehicle components. Along with the increase in cellphone use in automobiles, the newer and smaller cell phones canbe placed virtually anywhere within the cabin of the vehicle. As aresult, cell phones now are being placed in unforeseen locationsand often in close proximity to various electronic components,giving rise to potential interference and compatibility issues.This study focused on the frequency range of 800 MHz to 2.5GHz. The analysis generated a summary of the frequency spectrums,modulations and output power levels used by these technologies.Following completion of the technology evaluation,various types of radiated immunity tests were performed on automotivecomponent samples provided by a variety of manufacturers.The samples had known compatibility issues with cell phoneswhen installed in the vehicle. The testing was performed todetermine what type of test, test levels, and carrier signal modulations,could be used during component level evaluation in orderto identify these potential compatibility issues before they reachthe vehicle.AUTOMOTIVE EMC MEASUREMENTSVehicle Active Antennas Face EMC and RF Reception ChallengesJean-Roger K. Kuvedu-Libla, N/APresently, the vehicle active antennas are facing two big challenges.One of them is to meet the requirements of radio frequency (RF)reception and the next one is to respond to electromagnetic compatibility(EMC) demands at the same time. For that, the questions thispaper answers are: 1) incorrect consideration / definition of theseantennas; 2) influencing parts of the passive antenna structures, forexample the ground influence; and 3) the specification of necessaryamplifier noise floors and gains.©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org
EMC <strong>2007</strong> ADVANCE PROGRAM27Automotive EMC: Key Concepts for Immunity TestingHeri Rakouth, Delphi Steering Systems; Clane Cammin, DelphiCorporation; and Luke Comstock, Delphi CorporationThis paper is aimed at providing the rationales that gave birth tounique test methods used for both radiated and conducted immunitytesting. This paper singles out three concepts: 1) the ConstantPeak Amplitude method applied to AM testing, 2) the 4-probe averagingcalibration method for the Vehicle Radiated Immunity (VRI)test, and 3) the variable injection probe location for Bulk CurrentInjection (BCI) measurements. Derived benefits are harmonic reductionfor AM testing, over and under testing avoidance in BCI, andVRI. They are part of the ISO-11451, ISO-11452, and SAE J1113standards since their publications in the 1990’s.Development and Evaluation of a Realtime Time-DomainEMI Measurement System for Automotive TestingStephan Braun, Institute for High Frequency Engineering; Martin Aidam,Daimler Chrysler AG; and Peter Russer, Institute for High FrequencyEngineeringTime-Domain EMI measurement systems allow the measurementtime to be reduced by several orders of magnitude. In this paper areal time time-domain EMI measurement system for automotivetesting is presented. Automotive tests require smaller frequency binsand a smaller IF-Bandwidth. In the frequency domain, such measurementstake an extremely long time, and sometimes they exceedthe life-time of a component. A novel, real-time, time-domain EMImeasurement system is presented that reduces the time for automotivemeasurements by a factor of 8000. By a numerical oscillator inthe signal processing unit, the picket fence effect is reduced.Measurements have been performed on components and on a completevehicle in the frequency range 30 MHz to 1 GHz. The realtimetime-domain EMI measurement system has been evaluated andassessed in an automotive test environment.Improving Automotive Radiated Emissions RepeatabilityWhen Using Optic Link Bus ConvertersFerran Silva; and Marc Aragon, — Technical University of CataloniaThis paper analyzes the effect of using an optic link bus converter inEMC tests. Although the optic link is used to avoid an additionalconductive connection to the EUT, the interface could disturb theelectromagnetic behavior of the EUT bus section. After showing severalsituations where the repeatability is compromised in automotiveEMC tests, the paper analyzes the problem with several measurementsand proposes a model to evaluate the effect. A proper positionon a commercial optic bus link converter is discussed.AUTOMOTIVE EMC MODELINGTransient Electromagnetic Field Computation in AutomotiveEnvironments using FDTDPere Riu; Ricardo Jauregui; Ferran Silva; and Mireya Fernandez, —Universitat Politecnica CatalunyaNumerical electromagnetic computation at high frequencies in automotiveenvironments is a challenging problem because of the dimensionsof the problem compared to the wavelength. Results obtainedso far have been presented in the frequency domain. We are presentingcomparisons between calculated and measured transient waveforms,in the time domain, by using a model of a realistic car bodyframe. Results are presented for different settings of grid parametersin the simulation. The agreement of the signals in time and also inthe frequency domain allows us to conclude that such computationsare feasible up to the GHz frequency band and using modest computationresources.EMI Modeling in an Automotive Data CommunicationStructureFrank Li, Youngstown State University; Tamer Taher, Youngstown StateUniversity; Jalal Jalali, Youngstown State University; Fred Esenwein,Delphi Packard; Nick Lockard, Youngstown State University; and AndrewPtichkin, Youngstown State UniversityData links are facing more internal and external electromagneticnoises due to high speed data communications in the automobileindustry. A mathematical model is presented to predicate the EMIin automotive data link circuitries. This model is a useful mechanismthat facilitates the future automotive cable designs in EMIreductions. Experimental results indicate that the model accuratelypredicts crosstalk-couplings of three, 1.7 meter, standard unshielded,multi-conductor cables up to 80 MHz where the signal wavelengthis at least two times longer than the cable length. All experimentaldata are collected inside a fully enclosed NoiseKen tent. The tent isa shielded environment that minimizes background noises.Electromagnetic Conductive Interference Characteristics inthe Driving System of a Fuel Cell BusJinliang He; Bo Zhang; Shaofeng Yu; Wei Li; Shuiming Chen; and YongHuang, — Tsinghua University; Jae-bok Lee; and Sug-hun Chang, —Korea Electrotechnology Research InstituteBased on the multiconductor transmission line model, this paper analyzedthe electromagnetic conductive interference in the driving systemof a fuel cell bus by calculation. Firstly, the propagation characteristicsof the conductive interference in the cable were analyzed.Then, the common mode current and its coupling effect were investigated.Finally, the coupling between the driving system and thelow voltage system was researched. The results will be useful forrestricting the electromagnetic conductive interference in the fuelcell bus.A Statistical Model of Noises at the Input Port of an Inverterand its Coupling to a Low Voltage Cable on a Fuel Cell BusWei Li; Shaofeng Yu; Bo Zhang; Jinliang He; Yong Huang; ShuimingChen; and Rong Zeng, — Tsinghua UniversityThe hybrid electric Bus has some serious EMC problems. A normaldistribution is proved suitable to describe the noise fluctuation onthe input port of an inverter. Typical noise patterns are summarizedwith seven key parameters. Then crosstalk between the power cablesand nearby signal cables is analyzed with an injection of these typicalnoises. Time parameters of noises are observed that can influence thecrosstalk significantly. It is concluded that an update should be madein the present standards for the conducted emission limitation onvehicles due to their neglect of the time parameters of noise sources.HIGH-VOLTAGE EMCCorona Onset Voltage at High Frequency for an Isolated,Cylindrical ElectrodeWilliam Price, The Boeing Company; John Drapala, The Boeing Company;David Thiel, Griffith University; and Robert Olsen, Washington StateUniversityCorona on antennas or transmission lines is a significant source ofelectromagnetic interference on aircraft. A corona onset criterion,which describes breakdown in nonuniform RF fields, is derived fromthe Boltzmann transport equation. Predictions of corona onset are©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org
Page 3 and 4: WELCOME FROM THE CHAIRJanet O’Nei
Page 5 and 6: Why Meet The StandardsWhen You Can
Page 7 and 8: Come see us at theIEEE EMC Symposiu
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