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逆变电源毕业设计文献翻译

第一篇：逆变电源毕业设计文献翻译文献翻译题目学生姓名专业班级学号院（系）指导教师完成时间逆变器电子信息工程电气与信息工程学院2009年06月05日Inverter1IntroductionAninverterisanelectricaldevicethatconvertsdirectcurrent(DC)toalternatingcurrent(AC);theconvertedACcanbeatanyrequiredvoltageandfrequencywiththeuseofappropriatetransformers,switching,andcontrolcircuits.Solid-stateinvertershavenomovingpartsandareusedinawiderangeofapplications,fromsmallswitchingpowersuppliesincomputers,tolargeelectricutilityhigh-voltagedirectcurrentapplicationsthattransportbulkpower.InvertersarecommonlyusedtosupplyACpowerfromDCsourcessuchassolarpanelsorbatteries.Therearetwomaintypesofinverter.Theoutputofamodifiedsinewaveinverterissimilartoasquarewaveoutputexceptthattheoutputgoestozerovoltsforatimebeforeswitchingpositiveornegative.Itissimpleandlowcostandiscompatiblewithmostelectronicdevices,exceptforsensitiveorspecializedequipment,forexamplecertainlaserprinters.Apuresinewaveinverterproducesanearlyperfectsinewaveoutput(3.1BasicdesignsInonesimpleinvertercircuit,DCpowerisconnectedtoatransformerthroughthecentretapoftheprimarywinding.AswitchisrapidlyswitchedbackandforthtoallowcurrenttoflowbacktotheDCsourcefollowingtwoalternatepathsthroughoneendoftheprimarywindingandthentheother.Thealternationofthedirectionofcurrentintheprimarywindingofthetransformerproducesalternatingcurrent(AC)inthesecondarycircuit.Theelectromechanicalversionoftheswitchingdeviceincludestwostationarycontactsandaspringsupportedmovingcontact.Thespringholdsthemovablecontactagainstoneofthestationarycontactsandanelectromagnetpullsthemovablecontacttotheoppositestationarycontact.Thecurrentintheelectromagnetisinterruptedbytheactionoftheswitchsothattheswitchcontinuallyswitchesrapidlybackandforth.Thistypeofelectromechanicalinverterswitch,calledavibratororbuzzer,wasonceusedinvacuumtubeautomobileradios.Asimilarmechanismhasbeenusedindoorbells,buzzersandtattooguns.Astheybecameavailablewithadequatepowerratings,transistorsandvariousothertypesofsemiconductorswitcheshavebeenincorporatedintoinvertercircui