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1、-------的设计方案，详细分析了LLC谐振变换器的工作原理；基于基波分析法（FHA）对LLC谐振变换器主电路进行了稳态建模，推导出了直流电压增益公式，对变换器的重要参数设计方法进行优化。其次，结合本课题所要分析的具体要求，对变频微波炉用LLC谐振软开关电源的主电路进行详细的计算，完成了主电路参数的设计，并且对各元器件进行了选型。再次，给出LLC谐振变换器的等效电路模型，运用扩展描述函数法对LLC谐振变换器进行小信号建模，得出了LLC谐振变换器的直流电压增益。最后，分析了SABER仿真模型，仿真稳态结果与有关文献中的实验结果一致，并指
2、出在开关管占空比不对称情况下，变压器铁芯依旧会发生偏磁的这一现象，为后续的完善提供新的角度。关键词：磁控管，LLC谐振变换器，扩展描述函数法，SABER，偏磁状态II-----------DEVELOPMENTOFVARIABLEFREQUENCYMICROWAVEOVENPOWERSUPPLYINLLCRESONANTCONVERTERABSTRACTWiththepopularityofhouseholdmicrowaveoven,itsefficiency,volumeandintellectualizeddegreegotmor
3、eandmoreattention.Thetraditionalmicrowaveovenmagnetronpowersupplyconsistsofanindustrialfrequencytransformerandahalf-wavevoltagedoublingrectifying.However,ithassomeshortcomings,suchaslowefficiency,largevolume,heavyweightanditspowerisnotadjustable.Withthedevelopmentofpower
4、electronicstechnology,theresonantconverterwhichcanrealizesoftswitchingwithitsadvantagesofhighefficiency,energysavinghasmadegreatdevelopmentandbecomemoreandmorewidelyused.Theapplicationofitonthemicrowaveovenisthevariablefrequencymicrowaveovenwithenergyconservationandenvir
5、onmentalprotection,highefficiencyandoutputpowercontinuouslyadjustable.Variablefrequencymicrowaveovenistheinevitabledevelopingtrendofmicrowaveoveninthefuture.Therefore,thispaperstudiesthepowersupplyofvariablefrequencymicrowaveoven,andanewdesignschemeisputforward.Andalsoth
6、ebiasmagnetstateisstudied.Basedontheunderstandingoftheworkingcharacteristicsonthebasisofthemagnetron,theworkingprincipleoftheLLCresonantconverterisanalyzedindetail.Basedonthisputsforwardadesignschemeofvariablefrequencymicrowaveovenmagnetronpowersupply.Themaincircuitusest
7、wo-stagestructure.Thefront-endcircuitusestheactivepowerfactorcorrectioncircuit,thenusingLLCresonantsoftswitchingconverteranddoublerrectifiercircuit.Thissoftswitchingpowersupplycantaketheplaceofthetraditionallinearpowersupply.Sothatthemicrowaveovencanwithsmallvolume,light
8、weight,highefficiency.Andalsocanrealizecontinuousadjustableoutputpower,whichgreatlyimprovetheintelligen
