2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、畢業(yè)設(shè)計（論文）外文翻譯題目：DesignofPWMControllerinaMCS51CompatibleMCUAuth.YueLiHuWeiWangMicroelectronicResearch&DevelopmentCenterCampusP.O.B.221149YanchangRdShanghai200072ChinaIntroductionPWMtechnologyisakindofvoltageregulationmetho

2、dbycontrollingtheswitchfrequencyofDCpowerwithfixedvoltagetomodifythetwoendvoltageofload.Thistechnologycanbeusedfavarietyofapplicationsincludingmotcontroltemperaturecontrolpressurecontrolsoon.InthemotcontrolsystemshownasF

3、ig.1throughadjustingthedutycycleofpowerswitchthespeedofmotcanbecontrolled.AsshowninFig.2underthecontrolofPWMsignaltheaverageofvoltagethatcontrolsthespeedofmotchangeswithDutycycle(D=t1TinthisFigure)thusthemotspeedcanbeinc

4、reasedwhenmotpowerturnondecreasedwhenpowerturnoff.Fig.1:TheRelationshipbetweenVoltageofArmatureFig.2ArchitectureofPWMModuleTherefethemotspeedcanbecontrolledwithregularlyadjustingthetimeofturnonturnoff.Therearethreemethod

5、scouldachievetheadjustmentofdutycycle:(1)Adjustfrequencywithfixedpulsewidth.(2)Adjustbothfrequencypulsewidth.(3)Adjustpulsewidthwithfixedfrequency.GenerallytherearefourmethodstogeneratethePWMsignalsasthefollowing:(1)Gene

6、ratedbythedevicecomposedofseparatelogiccomponents.Thismethodistheiginalmethodwhichnowhasbeendiscarded.(2)Generatedbysoftware.ThismethodneedCPUtocontinuouslyoperateinstructionstocontrolIOpinsfgeneratingPWMoutputsignalssot

7、hatCPUcannotdoanythingother.Therefethemethodalsohasbeendiscardedgradually.(3)GeneratedbyASIC.TheASICmakesadecreaseofCPUburdensteadywkgenerallyhasseveralfunctionssuchasovercurrentprotectiondeadtimeadjustmentsoon.Thenthesy

8、stemclocksignalwhosefrequencycanbedividedby4times12timesthroughsettingthevalueofT3MfPWM0T4MfPWM1inthespecialregisterPWMCONasshowninFig.4.ToPWM0generattheclockto16bitcounterwillbepredividedby4timesbydefaultwhenT3Missettoz

9、ero.theclockwillbedividedby12timeswhenT3Missetto1.ThisisalsotruefPWM1.TheotherbitsinPWMCONareexplainedindetailinTable1.Fig.4BitMappingofPWMCONTable1:TheBitDefinitioninPWMCONChannellogicThefollowFig.5showsthechannellogicw

10、hichisusefulinComplementaryMode.FromthisdiagramitiscleartoknowthatsignalCPCPWMcontrolthesourceofPWMHPWML.thedetailsaboutthetwocontrolsignalswillbediscussedinthesection3thearchitectureofdeadtimegeneratwillalsobediscussedi

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