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1、PhotovoltaicPowerPupplyPinePaveInverterBasedOn68HC908MR16MCU1IntroductionWiththegrowingenergycrisisandincreasetheenvironmentalawarenessofmankind,thedevelopmentandutilizationofnewenergyisrecciningincreasingattention.Andsolarenergyasaninexhaustiblesupplyofhighlyefficientnon-pol
2、lutingenergyhasmorepeopleofallages.Inthispaper,thephotovoltaicpowersystemissinusoidalinvertersuitableforahousehold,especiallyforelectrictywithoutelectricityinremoteareasofthewesternregionofapowersystmusers,asChina’swesterndevelopmentwillbeitsmarketprospectswillbecomemoreandmo
3、rebroad.2Structureandprincipleoftheinvertersystem2.1ThebasicstructureofthesystemFirstofall,bythesolararraytothebatterychargingcircuitinordertogetabasicstabilityoftheDCvoltage,andthenbytheinverterciruitwillbehigh-frequencyalternationgcurrentintodirectcurrentrecerse,andfinallyb
4、ythefrequencystep-uptransformerandfiltercircuitfilteringinto50Hz,220VsinusoidalACvoltage.Controlofthewholesystemiscompletedbyasingle-chipMR16.ThecorepartoftheformationofSPWMwaveandtheoutputACvoltageaccordingtothefeedbackform,composedofsamplingdigitalPIregulatorpart.2.2Single-
5、chipontheMR1668HC908MR16singlechipisalow-cost,high-performancesingle-chip8.Ithas32kbytesofrewritableflashmemory-chipFLASH,with768bytesofRAM,thissystemcompletelyenough;withadedicatedmotorfor6-channelPWMoutputPWMMCmodules,suitableforinsingle-phase,three-phaseinverter,atthesamet
6、imethemodulewasalsodevotedtotheprotectionFsultFAULTpin4,whemthefaultdoesnotoccurinthecaseofinterruptioncausedbytherapidblockadeofthePWMoutputtoachievethepurposeofprotection;withtheoptionexternalcrystalclockorinternalclockphase-lockedloopclockgeneratormodul,thesystemchosenbyth
7、einternalPLLclockcanproduccaccurate8MHzinternalbusfrequency,soastoensuretheaccuracyofthefrequencyofthesystem;withprogrammableADclock.ADfastestconversiontimeonly2μs,tominimizedisroptionofprogramexecutiontim;withSCIserialcommunicationinterface,canworkinfull-duplexorhalf-duplexm
8、ode,inthissystemcanreliablybecompletedwiththeoutsideworldkeyboardmon