单相电流型全桥单级pfc变换器的多级无源辅助环节-研究

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1、哈尔滨工业大学工程硕士学位论文AbstractTheinputsideoftraditionalpowerelectronicsdeviceismostlycomposedofuncontrolledequipment,producingalargenumberofhigh-orderharmonicsandreducingthepowerfactor.ActivePowerFactorCorrectiontechnologyisanefficientmethodtosuppressharmonicandimprovethepowerfactor.Single-stagefull-bri

2、dgePFCtechnologyhastheadvantagesofsimplestructure,lowcostandhighefficiency,soitissuitableformediumandhighpowerapplications.However,therearesomeproblemsinthestructure:duetotheexistenceoftheleakageinductorofthetransformer,itwillproduceseriousvoltagespikewhenthestateofthebridge-legswitcheschange,whi

3、chwillincreasethevoltagestressoftheswitches;thevoltageoftheoutputfiltercapacitorincreasesfromzerowhentheconverterstartsupandtheinputcurrentincreasesduringacertaintimeanditwillproducelargeimpulsecurrent.Therefore,itisnecessarytostudyontheseproblemsandsolvethemefficiently.Thepapermainlyresearchesam

4、ulti-levelpassiveauxiliarycircuitinasingle-phasecurrent-fedfull-bridgesingle-stagePFCconverter.Amulti-levelpassiveclamptechnologyisproposed.Thecircuitiscomposedofpassivecomponents-capacitors,inductors,diodesandsoon,whichissimple,reliableanddon’tneedcontrol.Aflybackstart-upmethodwithanextraflyback

5、windingisproposedonthebasisofthemulti-levelpassiveclamptechnology.Themulti-levelpassiveclampcircuitinthesingle-phasecurrent-fedfull-bridgesingle-stagePFCconverterusesapluralityofclampcapacitorinseriesbydiodestoabsorbthevoltagespikeacrossthebridge-armswitch,andtheabsorbedenergyistransferredtothelo

6、adbytheinductorsintheclampcircuitwhenthebridgediagonal-legswitchesturnon.Thepaperanalyzestheworkingprocessoftheconverterandthevoltagespikesuppressionofclampcircuitindetailed,andthedesignmethodofrelatedparameterisgiven.Theresonanceintheclampcircuitisnotsynchronizedbecauseoftheexistenceofdeviceerro

7、r.Tosolvetheproblem,thecoupled-inductorareusedtosuppresstheunbalanceofvoltageandcurrentandachievesynchronization-resonance.Theequivalentmodelofthecoupled-inductorissetupbasedontheresonanceprocessofthemulti-levelpassive