1、西南交通大學(xué)碩士學(xué)位論文埋弧焊電源數(shù)字化改造姓名：王清龍申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：潘厚宏20100501西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractBecauseofstrengthsinflexiblepowercontrol，easyflexiblecontrolimplementationhigherreliabilityandcontrolprecision，andcompatibleinterfa

2、ces，thedigl。talweldingpowersourcedrewspotlightintheacademicworldandbecameresearchfocusonceitappearedThed姆talcontrolsystemforsubmergedarcwelding(SAW)isdesignedbasedonthemaincircuitofMZ1250SCRautomaticSAWmachine，accordingt

3、othecontrolcharacteristicsandtechniquerequirementsofSAWDSPTMS320F2812isselectedasthemaincontrollerofthesystem111eexternaldigitalcontrolcircuitsandsoftwareoftheSAWmachinearedesignedrespectivelynlehardwaredesignreferstosig

4、nalsynchronouscircuits，signalconditionalcircuits，anddrive&isolationcircuitsAdditionallytheworkingflowofthesignalsynchronouscircuitsanddrive&isolationcircuitsareanalysedindetails，andisolationpulsetransformerisolationandop

5、to—couplersarecomparedandanalysedFinallyopto—couplerisselectedforthesinglepulsewidthtriggerModularideaisappliedinsoftwaredesignThesystemisdividedintomoduleswithdifferentfunctions，suchasthesyncpulsestocapture，ADsampling，P

6、IDcontrolalgorithmwithintegralseparationsingle—widthpulseoutputPhaseanalysisshowsthatthesynchronizationsignalhappensaheadofthemaincircuitphasevoltageby300TheproblemofphrasedifferenceinZerO—crossingpointwithnaturecommutat

7、ionby300issolvedskillfullyandtheangledifferenceiscontrolledin50～900accordingtothetriggercontr01requirementsThenewmethodofphase—shiftingdi百taltriggerisproposed，namelythetimereventmanagerworksinthecontinuousgrowthmode，phas

8、eangledependsontheTxCMPR(x=1，23，4)ofthecountingvalue，thevalueisreassignmentinthematchinterruption，triggerpulseisgeneratedusingvariablecycleideainordertoachieveafullyd蝤taltriggerDigitaltriggeranddualnarrowsinglewidthpulse

9、susedarediscussedindetailsandthefeasiblesolutionisputforwardEventuallyasingletriggerpulsewidthisultimatelyselectedintermsofthecomplexityofthealgorithmBesides，digltaltriggerinthecalculationoffiringangleisverifiedAsthedire

10、ctprogrammm‘gofnonlinearoperationsofDSPisdifficult，aflexibleandfast，easyprogramming，andhighprecisionfiringanglealgorithmisproposedneprecisionofthealgorithmistestedandverifiedinMatlabresultsshowthatthealgorithmiscorrectan

11、drationalFinallythedi酉talSAWpowersystemistestedResultsprovethataccuratedigitaltriggerisfeasibleandapplicableThus，thesystemisofgoodversatilityandworthcontinueddevelopmentandapplicationKeywords：SAW；digitaltrigger；Three—Pha