llc谐振变换器的时域分析模型与其限流控制策略

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1、华中科技大学硕士学位论文initialdrivingpulseswidthoptimizationmethodtodrivetheresonantcurrentintoconvergencerapidlywithoutovershoot,whichrelievesthedemandonstartingfrequencytorestrictcurrentspike.AnsplitresonantcapacitorstructureforLLCresonantconverterisadoptedwithdrivingpulsesoptimizationtoadapttosituationwithr

2、elativelylowercurrentlimitingvalue,savingthenumberoftransitionpulsesandsimplifyingthedesignofthepulseswidth.Besides,themaximumvalueofresonantcurrentduringopenloopstart-upisobtainedbasedonthetimedomainmodelofLLCconverterandtheoptimalfrequencytimeconstantiscalculatedusingiterationalgorithm,whichsatisf

3、iestherestrictofcurrentlimitingvalueandguaranteestheresponsespeedofoutputvoltageadditionally.Fortheissueofextracostofcurrentsensingofcloseloopcurrentlimitingmethod,thispaperanalyzestherelationbetweenresonantcurrent,outputvoltageandswitchingfrequency,consideringtheeffectofmagnetizingcurrent.Thenanclo

4、seloopcurrentlimitingcontrolstrategywithoutcurrentsensingisproposed,whichmodulatestheswitchingfrequencybasedontheoutputvoltageandachievesconstantpeakvalueofresonantcurrentduringstart-up,loadsteppingandoverloadcondition.Thedesignmethodofcurrentlimitingparametersareprovided,andthemaximumavailablevalue

5、ofoutputvoltageunderoverloadconditionandsettletimeofoutputvoltageduringstart-upareanalyzed.Keywords:LLCresonantconverter,currentlimitingcontrol,largesignalmodeling,stateplaneanalysis,withoutcurrentsensing,resonantcurrentIV华中科技大学硕士学位论文目录摘要..............................................................

6、......................................................IABSTRACT....................................................................................................III1绪论.............................................................................................................11.1选题背景和研究意义.........

7、........................................................................11.2LLC电路分析模型研究现状及存在的问题............................................11.3LLC电路限流技术研究现状及存在的问题......................................