51单片机脉宽调制控制器外文文献及翻译

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1、51单片机脉宽调制控制器外文文献及翻译51单片机脉宽调制控制器外文文献及翻译DesignofPWMControllerinaMCS-51CompatibleMCUYue-LiHu,WeiWangMicroelectronicResearch&DevelopmentCenter,KeyLaboratoryofAdvancedDisplayandSystemApplications(ShanghaiUniversity),MinistryofEducationCampusP.O.B.221,149YanchangRd,Shanghai200072,

2、ChinaE-mail:lwfree@lwfree.cnAbstractThispaperpresentsadesignofPulse-WidthModulated(PWM)controllermoduleinaMCUbasedonMCS-51structure.Thedesigncangenerate2-channelprogrammableperiodicPWMsignals.TheseoutputPWMsignalsfromMCUcanbeusedforavarietyofapplicationsincludingmotorcontrol

3、.Thefunctionofthedesignallowsuserstoselectindependentorcomplementaryinversiontimingrelationshipsbetween2PWMwaveforms.ThelattermodeselectionalsoincludesoptionaldeadtimefunctiontosupportdrivingH-bridgesandinverters.Therefore,userscancontroltheoutputPWMsignalsthroughsettingthed

4、uty-cycleregisters.Afterthesuccessfulsimulationatthefrontend,practicalexperimentsmadeonaNIOSdevelopmentboardverifythedesign.1.IntroductionPWMtechnologyisakindofvoltageregulationmethodbycontrollingtheswitchfrequencyofDCpowerwithfixedvoltagetomodifythetwo-endvoltageofload.This

5、technologycanbeusedforavarietyofapplicationsincludingmotorcontrol,temperaturecontrolandpressurecontrolandsoon.InthemotorcontrolsystemshownasFig.1,throughadjustingthedutycycleofpowerswitch,thespeedofmotorcanbecontrolled.AsshowninFig.2,underthecontrolofPWMsignal,theaverageofvo

6、ltagethatcontrolsthespeedofmotorchangeswithDuty-cycle(D=t1/TinthisFigure),thusthemotorspeedcanbeincreasedwhenmotorpowerturnon,decreasedwhenpowerturnoff.Fig.1PWMcontrolblockdiagramFig.2:TheRelationshipbetweenVoltageofArmatureandDuty-cycleTherefore,themotorspeedcanbecontrolled

7、withregularlyadjustingthetimeofturn-onandturn-off.Therearethreemethodscouldachievetheadjustmentofdutycycle:(1)Adjustfrequencywithfixedpulse-width.(2)Adjustbothfrequencyandpulse-width.(3)Adjustpulse-widthwithfixedfrequency.Generally,therearefourmethodstogeneratethePWMsignalsa

8、sthefollowing:(1)Generatedbythedevicecomposedofseparatelogiccomponents.This