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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.15,NO.3,MAY2000439TheEvolutionofPowerElectronicsThomasG.Wilson,LifeFellow,IEEEAbstract—Distinctiveattributesofpowerelectronicsequipmentarehighpowercapability,controllabilityandstaticswitchingtomeetthegoalsofhighefficie
2、ncyandhighdependability.Aspectsoftheearlyhistoryofpowerelectronicsaretracedfrommagneticamplifiers,thyratrons,andignitronstopowersemiconductors.IndexTerms—AC–ACpowerconversion,AC–DCpowerconver-sion,DC–ACpowerconversion,DC–DCpowerconversion,his-tory,magnetica
3、mplifiers,powerconversion,powerelectronics.Fig.1.Tocontroltheflowofelectricenergybetweenasourceandoneormoreloadsrequiresaninterveningvariableimpedance.I.INTRODUCTIONOWERelectronicshasahistorythatismucholderthanthattheauthorisneitherahistoriannorevenwhatmigh
4、tbePmanyofuspracticinginthefieldtodayarelikelytore-describedasaseriousstudentofhistory.Theauthorisonewhoalize.Aswewillsee,itsgrowthanddevelopmenthavenotbeenconsidershimselfaseriousengineer,whohashadmorethanwhatonewouldcallsmoothandorderly.The“lifechanging”f
5、ortyyearsofexperienceingovernment,privateindustryandepisodesthathavebroughtaboutthemostdramaticchangesinteaching,concentratingmostofhisprofessionaleffortinthethefieldhavebeenlargelyunanticipated.areaweusuallyidentifytodayaspowerelectronics.Assuch,Toprovidea
6、frameworkbothforlookingbackwardtowardhehashadthegoodfortunetoobserveatcloserangemanyofourrootsandatthesametimeforbetterunderstandingthetheeventsandtoknowpersonallymanyoftheindividualswhocontextinwhichpowerelectronicsengineersworktoday,itishavehadandwillyeth
7、aveamajorhandinshapingthedirectionhelpfultoadoptthefollowingworkingdefinition:ofthisfieldduringthelasthalfofthe20thcenturyandintothePowerelectronicsisthetechnologyassociatedwiththe21stcentury.efficientconversion,controlandconditioningofelectricInpreparingth
8、ematerialforthispaper,theauthorhastriedpowerbystaticmeansfromitsavailableinputformintotobeascarefulinrecountingeventsofthepastashewouldthedesiredelectricaloutputform.indescribingalaboratoryexperiment.T
