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1、奋此二弃大李硕士李位格亥ABSTRACTInverterspotweldingpowersourceisoneofimportantdirectionsinthestudiesoftheresistance-weldingfield.Withsoft-switchingtechnology,inverterspot-weldingpowersourcehaslowerswitchingdissipation,lowerelectromagneticinterferenceandlowersensitivitytoparasiticparametersofpowerc
2、ircuit,contributetoinverteroutputcharacteristicsandcircuiteficiency,stabilityandreliability.Thebasicworkingprincipleofthephase-shiftedPWMsoft-switchingtopologyDC/DCfullbridgewithassistancenetworkispresentedandanalyzedindetail,andthecircuitsimulatingsoftwareofPspiceisusedforsimulationin
3、thispaper.Zero-voltageturn-onandzero-voltageturn-offinlaggingarmandleadingarmofsoft-switchingtopology,workingwaveformofpowertransformerandprocessofrectifierandtransitionarepresentedindetail.Theinfluenceofresonantinductanceofthepowertransformer,resonantcapacitorandvariationofloadtothepr
4、ocessofsoft-switchingaregiven.Bycomparedwiththesimulationresultsandtheexperimentresults,wecometotheconclusionsthat:①circuitwithassistantnetworkcanwidensoft-switchingextentinlaggingarm,reducesduty-cyclelossonthesecondary,diminishesswitchingdissipationofinverterspot-weldingpowersource.②T
5、herangeofresonantcapacitor,theimportantfactortosoft-switchingprocess,notonlyafectszero-voltageturn-offofpowerswitches,butalsoafectstherangeofzero-voltagetum-onofpowerswitches.Soresonantcapacitorsmustbeconsideredaccordingtomanyaspects;③Iteasilyfulfilssoft-switchingconditioninlaggingarma
6、sleakageinductanceofpowertransformerincreases,butbiggerleakageinductanceofpowertransformerincreasesopeningdissipationoftransformeranddecreaseseficiencyofsoft-switchinginverterpowersource.Inaddition,theworkingprinciple,characteristicsandcompensationofthecontrolsystemofcurrentpeakaredeep
7、lydiscussed;thePWMcontrolcircuitofusingUC3875asthecore,theinputingover-voltageprotectingcircuitandowe-voltageprotectingcircuitaregiven,etc.Key-words:Spot-weldingInverterpowersourceSoft-switchingSimulationAssistantnetwork11-西此工必大李硕士李位论夫第一章绪论1.1逆变电阻焊电源的技术优势及其发展现状1.1.1逆变电阻焊电源的技术优势21世纪的人
