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山东农业大学课程考试专用注：考试期间试卷不允许拆开。第1页共2页2010-2011学年第1学期《PowerElectronicDevices》测验A课程代码考试方式闭卷考试时长100分钟姓名学号教学班号专业级班一、Fillsupthetopic1、Insingle-phasebridgefully-controlledrectifierwithR-Lload,(Lislargeenough)thethyristorvoltageUFMis___________URMis_________2、Insingle-phasehalf-wavecontrolledrectifierwithresistanceload,therangeofthedelayangleis________.3、Inthree-phasehalf-wavecontrolledrectifierwithresistanceload,thecurrentwillbeconstantwhenthedelayangleis_______________________.4、Insingle-phasebridgehalf-controlledrectifier,themethodtoavoidoutofcontrolis________________________.二、Repliessimply1、Whatistheadvantageanddisadvantageofhalfwaverectifierandbridgerectifier?Whichisoftenwellusedinthepractice?2、Withsmallrippleapproximation,designachopperwhichcanoutputdc24v,whichinputvoltageisdc18v.3、Whatarethenecessaryconditionsfortheinvertermodeoperationofcontrolledrectifiers?得分得分山东农业大学课程考试专用注：考试期间试卷不允许拆开。第2页共2页三、Calculate1、IntheSingle-phasebridgehalf-controlledrectifier,theinputvoltageofthetransformerisac220vandtheloadisresistanceandbiginductancewithAdditionalfreewheelingdiode.Ifwewanttoachievethefollowingobjectivesthattheoutputvoltagevariedintherangedc20vtodc80v,andthemax-currentis20A,theminimumdelayangleis30º,thefollowingwillbesolving：1)Drawingelectriccircuit2)Drawingthewaveformofud、ivt1（α＝30°）3)Calculatethetransformervoltageratio、resistance。2、Three-phasehalf-wavecontrolledrectifierwithInductiveandEMFload,U2=100V，R=1Ω，L=∞，whenα＝30°、E=50V,drawtheelectriccircuitandthewaveformofud、iT.AndsolveUd、Id.得分