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1、电气信息工程学院毕业设计（论文）外文翻译外文资料名称：Pulsewidthmodulation专业：通信工程姓名：姜芳学号：10-2-07指导教师：危厚琴二○一四年三月二十八日PulsewidthmodulationPulseWidthModulation(PWM),whichisEnglish"PulseWidthModulation"abbreviation,referredtoas"PulseWidthModulation,istouse.ThemicroprocessorThedigitaloutputtoanalo
2、gcircuitstocontrolaveryeffectivetechnology,widelyusedinfrommeasurement,communicationtopowercontrolandtransforminmanyareas.Pulsewidthmodulationisakindofanalogcontrolmode,itsaccordingtothecorrespondingchangesinloadmodulationtransistorbaseorMOStubeGatebias,toachieveor
3、MOStransistorconductiontimechange,soastorealizethechangeofaswitchingpowersupplyoutput.Thiswaycanmaketheoutputofthepowersupplyvoltagechangesinworkingconditionsremainconstant,istouseThemicroprocessorThedigitalsignalAnalogcircuitTocontrolaveryeffectivetechnique.PWMcon
4、troltechnologyWithitscontrolissimple,flexibleanddynamicresponsegoodadvantageandbecomePowerelectronictechnologyThemostwidelyusedcontrolmethod,alsoisthepeopleresearchhotspot.Duetothedevelopmentofscienceandtechnologytodayhasnoboundarybetweendisciplines,combinationMode
5、rncontroltheoryIdeasorwithoutresonantwaveswitchtechnologywillbecomeoneofthemaindevelopmentdirectionofPWMcontroltechnology.BackgroundAppearedwiththedevelopmentofelectronictechnology,avarietyofPWMtechniques,including:phasevoltagePWMcontrol,pulsewidthPWMmethod,randomP
6、WM,SPWMmethod,linevoltagePWMcontrol,etc.,andinthenimhbatteriesusingthepulsewidthofthePWMmethodinintelligentcharger,itistoputeachpulseEqualpulsewidtharelistedasaPWMwaveform,bychangingthecyclecanbefrequencymodulationpulsetrain,orchangethepulsewidthDutyratioCanregulat
7、ing,adoptappropriatecoordinationcontrolmethodcanmakethevoltageandfrequencychange.CanadjustthePWMcycle,throughthePWMdutycycleandachievethepurposeofcontrolthechargingcurrent.Thevalueoftheanalogsignalcanbecontinuouschange,itstimeandamplituderesolutionwithoutrestrictio
8、ns.9vbatteryisananalogdevice,becauseofitsoutputvoltageisnotexactlyequalto9v,buttochangeovertime,andrecommendanyrealvalue.Similarly,absorbthecurre
