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1、StudyofControlforInductionHeatingPowerSupplywithLLCResonantLoadBasedonDSPZhangyinTu,YueqingZhou,NianfuZhangSchoolofElectricalEngineeringandAutomation,TianjinUniversity,Tianjin,Chinatuzhangyin@163.comAbstract—Inordertoimprovetheefficiencyofpowersupply,thechanging.Inordertoimprovet
2、heefficiencyofpowersupply,methodofelectrostaticcouplingisappliedtodesignLLCthesuitablecontrolvariablesareacquiredtobeselected.[1]resonantloadforimplementingloadmatching.Inthispaper,thecharacteristicsofLLCresonantloadandtheselectionofTheLLCresonantcircuitisshownasFigure2.controlva
3、riablesforinductionheatingpowersupplyareLanalyzed.Inaddition,amethodforimplementingtheDigitaldPhaseLockedLoop(DPLL)appliedtoinduction-heatingpowersupplyandphase-shiftedPWMareputforwardinthepaper.S1CL1D2D2TheprocessofimplementingthismethodusingDSPispresented1Salso.Thephase-shifted
4、PWMisrealizedforthesystem.AndtheTHEa2POWERCL2systempromotedthedigitalcontrolleveloftheinductionheating.dbCRKeywords:inductionheating;LLCresonantload;DPLL;DSPCSD4D33S44I.INTRODUCTIONAstheautomationcontroldegreeandreliabilityrequirementsraises,theinductionheatingpowersupplybeginsFi
5、gure1.thestructureoftheinductionheatingtodevelopinthedirectionofintellectualizationanddigitization.DSPhashighspeeddigitalprocessingabilityandrichperipheralsfunction,itmakessomeadvancedcontrolstrategyLL12whichisappliedtopractice.Digitalcontrolsystemforinductionheatingpowersupplyba
6、sedonDSParenotonlyexcellentstability,butalsothecontrolcircuitissimpleandtheii[2]12softwaredesignisflexible.Inthepaper,thedigitalcontrolsystemforinductionheatingpowersupplywithLLCresonantuabuCCRloadisdesignedwithTMS320F2812.Itincludestheselectionofcontrolvariables,digitalandphasel
7、ockloop,phase-shiftedofPWM,etc.Figure2.LLCresonanceloadcircuitII.SYSTEMSTRUCTURETheimpedanceexpressionoftheLLCresonantloadisasThewholestructureofinductionheatingpowersupplyfollows,systemisshowninfigure1.Themaincircuitofpowersupplyisconstitutedbyrectifier,filter,inverterandload.Th
8、ethree-1Zj()ww=+L(1)1phasenon-controlled
