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1、Abidirectional,sinusoidal,high-frequencyinverterdesignE.Koutroulis,J.Chatzakis,K.KalaitzakisandN.C.VoulgarisAbstract:Anewmethodforthedesignofabidirectionalinverterbasedonthesinusoidalpulse-widthmodulationprincipleandtheuseofalow-costandlightweightferrite-coretransformerispresen
2、ted.Theinverterisdesignedforeitherohmicorinductiveloads.InthecaseofinductiveloadsthereactivepoweristransferredbacktotheDCinputpowersourceusinganewactiverectifierdesign.Theinverteriscontrolledbytwominimum-timefeedbackloops,providingrelativelylowoutputvoltagedistortion(lessthan2%
3、forDCinputhigherthan24V)andgoodloadregulation(betterthan2%),whiletheinverterefficiencyremainsrelativelyconstant(from80to85%)overawideoutputpowerrange(75to200W)andDCinputvoltagerange(23to28V).Theoreticalresultsareexperimentallyverifiedusingalaboratoryprototype.1Introductionenerg
4、yisstoredinbatteries,itisdesirabletohaveabidirec-tionalpowerflow.ThisisalsoimportantinthecaseofDC/ACpowerconverters(inverters)arewidelyusedtodayreactiveloads,wherethereactivepowermustbetrans-mainlyinuninterruptiblepowersupplysystems,ACmotorferredbacktotheDCinputsourcetoincrease
5、theoveralldrives,inductionheatingandrenewableenergysourcesystemefficiency.Theimplementationofbidirectionalsystems.Thesimplestformofaninverteristhebridge-typepowerflowbyconnectingaflybackconverterattheoutput[1],showninFig.1a,whereapowerbridgeiscontrolledofaDC/DCconvertertypeinve
6、rter[6]totransferthereac-accordingtothesinusoidalpulse-widthmodulationtivepowerbacktotheDCinputsourceresultsinincreased(SPWM)principleandtheresultingSPWMwaveisfilteredoutputvoltagedistortionduetothedelayassociatedwithtoproducethealternatingoutputvoltage.Thismethodhasthereactive
7、powersensingandcontrol.thedisadvantagethatinthecasewherelowdirectinputvoltageisused,thepowertransformerrequiredisoflargesize,heavyweightandhighcost.Aninverterdesignmethodbasedontheuseofaconvertertoconvertthedirectinputvoltagetorectifiedsinewaveandapowerbridgetoproducethealterna
8、tingoutputvoltage[2],showninFig.1b,hasthedisadvantageo
