谐振式软开关恒流充电电源的研究-电气工程专业论文.docx

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谐振式软开关恒流充电电源的研究-电气工程专业论文.docx

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谐振式软开关恒流充电电源的研究-电气工程专业论文

AbstractStoragebatteryhasbeenwidelyusedinmineelectricalvehicleanduninterruptiblepowersupplybecauseofthelargecapacityandhighpowerdensityinrecentyears.Thechargingpowersupplyastheenergysupplyequipmentiscloselylinkedtostoragebatteryanditsperformanceaffectstheoverallperformanceofstoragebattery.Theconventionalchargingpowersupplyhashighswitchinglosses,lowefficiencyandlowpowerdensity.Soitisverymeaningfultoresearchthechargingpowersupplywiththefeaturesofhighefficiencyandhighpowerdensity.Thispaperanalyzesthecurrentstatusofchargingpowersupplyandidentifiesthatsoft-switchingtechniqueistheeffectivemethodtoincreaseefficiencyandpowerdensity.Accordingtotheadvantagesanddisadvantagesofcommonsoft-switchingtopologiesandtheoperatingcharacteristicsofconstantcurrentchargingpowersupply,themaincircuitofcurrentchargingpowersupplyisidentifiedtouseseriesloadresonantconverterandhalf-bridgeLLCresonantconverter.Thispaperdoesafurtherresearchontheinterleavedparalleltechniqueoftwoseriesloadresonantconverterunits.Accordingtotheconditionofconstantcurrentoutputandthefeaturesunderdifferentoperatingmodesofseriesloadresonantconverter,itisclearthatresonantcurrentofconvertershouldbeoperatedindiscontinuousmode.TheZCSconditionofswitchisdiscussedthroughanalyzingprincipleoftheconverter.Therectifierstructureofseriesloadresonantconverteronlow-voltageandhigh-currentconditionsisalsoanalyzed.Thispaperalsoresearchestheinterleavedparallelcontrolmodeoftwoseriesloadresonantconverterunits.Fixingpulsewidth,adjustingfrequencyandshiftingphaseisusedtothecontrolmethod.Maincircuitandcontrolcircuitaredesignedandthesimulationofinterleavedparallelconverterwithtwoseriesloadresonantconverterunitsiscarriedout.Theworkingprincipleofthehalf-bridgeLLCresonantconverterintwodifferentswitchingfrequencyrangesisanalyzed.Theequivalentmodeloftheconverterbythefundamentalanalysismethodisbuilt.Thecurrenttransmissioncharacterandthevoltagegainareanalyzedbasedonthemodelofthehalf-bridgeLLCresonantconverter,andtheconditiontoachieveZVSsoft-switchingisana