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FacultyofEngineeringFacultyofEngineeringPapersTheUniversityofAucklandYearDesignconsiderationsforacontactlesselectricvehiclebatterychargerChwei-SenWang∗OskarH.Stielau†GrantCovic‡∗UniversityofAuckland,†UniversityofAuckland,‡UniversityofAuckland,g.covic@auckland.ac.nzThispaperispostedatResearchSpace@Auckland.http://researchspace.auckland.ac.nz/engpapers/261308IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.52,NO.5,OCTOBER2005DesignConsiderationsforaContactlessElectricVehicleBatteryChargerChwei-SenWang,OskarH.Stielau,andGrantA.Covic,SeniorMember,IEEEAbstract—Thispaperoverviewstheoreticalandpracticaldesignissuesrelatedtoinductivepowertransfersystemsandverifiesthedevelopedtheoryusingapracticalelectricvehiclebatterycharger.Thedesignfocusesonthenecessaryapproachestoensurepowertransferoverthecompleteoperatingrangeofthesystem.Assuch,anewapproachtothedesignoftheprimaryresonantcircuitispro-posed,wherebydeviationsfromdesignexpectationsduetophaseorfrequencyshiftareminimized.Ofparticularinterestaresys-temsthatareneitherlooselynortightlycoupled.Thedevelopedsolutiondependsontheselectedprimaryandsecondaryresonanttopologies,themagneticcouplingcoefficient,andthesecondaryqualityfactor.IndexTerms—Batterycharging,electricvehicle,electromag-Fig.1.Structureofinductivepowertransfersystem.neticcoupling,inductivepowertransfer,resonance.handlingsystems[6],[7]andpublictransportsystems[8]whereI.INTRODUCTIONthesecondarysystemsareelectricallyisolatedandmovealongalongtrack.ElectricisolationisalsoessentialforpowersuppliesNDUCTIVELYcoupledpowertransfer(ICPT)systemsareinharshenvironmentssuchasminingandoutdoorlighting.Thedesignedtodeliverpowerefficientlyfromastationarypri-Iadvantagesofsuchsystemsaresafety,reliability,lowmainte-marysourcetooneormoremovablesecondaryloadsoverrel-nance,andlongproductlife.ativelylargeairgapsviamagneticcoupling.ThefundamentalBoththeprimaryandsecondaryresonantcircuitsoftheICPTprinciplesofsuchsystemsareidenticaltowellknowncloselysy
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