杨波博士论文LLC谐振变换chapter 5.pdf

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1、BoYangChapter5.ImprovementsofLLCresonantconverterChapter5ImprovementsofLLCResonantConverterFrompreviouschapter,thecharacteristicanddesignofLLCresonantconverterwerediscussed.Inthischapter,twoimprovementsforLLCresonantconverterwillbeinvestigated:integratedmagneticdesignandoverloadprotection.5.1Magne

2、ticdesignforLLCResonantConverterFrompreviousdiscussion,thepowerstagecouldbedesignedaccordingtothegivenspecifications.Theoutcomeofthedesignisthedesiredvaluesforthecomponents.Forthesecomponents,powerdevicesandcapacitorsareobtainedfrommanufactures,whichalreadyreflectthestateofthearttechnology.Withina

3、llthesecomponents,magneticistheoneneedtobephysicallydesignedandbuiltbypowerelectronicsresearcher.Inthispart,thedesignofmagneticcomponentforLLCresonantconverterwillbediscussed.5.1.1DiscretedesignandissuesForaLLCresonantconverter,themagneticcomponentsneedtobedesignedareshowninFigure5.1.Therearethree

4、magneticcomponents:Lr,LmandtransformerT.FromtheconfigurationofLmandtransformerT,itiseasytobuild142BoYangChapter5.ImprovementsofLLCresonantconverterLmasthemagnetizinginductanceoftransformer.Soinfact,wearetryingtobuildoneresonantinductorandonetransformerwithmagnetizinginductance.Figure5.1Magneticstr

5、uctureforLLCresonantconverterThereareseveralwaystobuildthem.Oneisusingdiscretecomponents,withonemagneticcoretobuildtheresonantinductorandonemagneticcoretobuildthetransformerandmagnetizinginductorLm.Thebenefitofthismethodisthatthedesignprocedureiswellestablished.Next,adiscretedesignispresentedandsi

6、mulationresultisshowedtoprovideareferenceforlaterintegratedmagneticdesigns.ForLLCresonantconverter,theresonantinductorLrhaspureACcurrentthroughit,soweusesoftferritecoreforbothinductorandtransformer.Figure5.2showsthediscretedesignofthemagneticforLLCresonantconverter.TwoUcoreswereusedtobuildthereson

7、antinductorandgappedtransformer.Fig.6showsthesimulationresultsoffluxdensityinthecore.For143BoYangChapter5.ImprovementsofLLCresonantconverter2eachUcore,thecross-sectionareais116.5mm.Designresult:nl=12,np:ns:ns=16: