無頻閃無電解電容LED驅動電源研究.pdf

1、南京航空航天大學碩士學位論文無頻閃無電解電容LED驅動電源研究姓名：王舒申請學位級別：碩士專業(yè)：電力電子與電力傳動指導教師：阮新波201103無頻閃無電解電容LED驅動電源研究IIABSTRACTLightEmittingDiode(LED)hastheadvantagesofenergysavingenvironmentalfriendlinesssafetylonglifetime.Itisthefourthgenerationli

2、ghtsourcefollowingincescentlampfluescentlamphighintensitydisgelamp.ThedevelopmentofLEDlightingtechnologyneedshighreliabilityhighpowerfactlonglifetimelowcostLEDdrivers.Thisthesisisdedicatedtothedesignofanovelflickerfreeel

3、ectrolyticcapacitlessLEDdriver.WhentheLEDdriversutilizethecommercialacvoltagesourcethefunctionofpowerfactcrection(PFC)shouldberealizedtoachieveahighpowerfact.Indertobalancethedifferencebetweentheinstantaneousinputoutputp

4、oweralargestagecapacitisrequiredelectrolyticcapacitisoftenused.ThelifetimeofelectrolyticcapacitismuchlowerthanthelifetimeofLEDelectrolyticcapacitisthemaincomponentthatlimitsthelifetimeoftheLEDdriver.Soelectrolyticcapacit

5、shouldberemoved.InthisthesistheoperatingprincipleoftheelectrolyticcapacitlessLEDdriverbasedontheflybackconverterisanalyzedtheharmoniccomponentsinthesecondarysideoftheflybackconverterarediscussedindetailbaseonwhichtheoutp

6、utfilterinductcapacitaredesignedtoreducethepeakaverageratiooftheoutputcurrent.TheoutputcurrentintheaboveelectrolyticcapacitlessLEDdriverispulsatingitcontainstheaccurrentwithtwicethelinefrequency.Thepulsatingcurrentleadst

7、oflicker.AnovelflickerfreeelectrolyticcapacitlessLEDdriverisproposed.AbidirectionalbuckboostconverterisintroducedintotheelectrolyticcapacitlessLEDdriveritprovidestheflowingpathftheaccurrentwithtwicethelinefrequency.Conse

8、quentlytheoutputcurrentfdrivingLEDisapureconstantdccurrentnoflickeroccurs.Therelationshipbetweenthevoltageripplecapacitanceoftheoutputfiltercapacitinthebidirectionalbuckboostconverterisdiscussedthevalueoftheinputfilterin

9、ductinthebidirectionalconverterisdesignedbasedonthetradeoffofthetrackingspeedoftheinputcurrentcurrentripple.Basedonthetheeticalanalysisa35Wprototypehasbeenbuilttestedinthelab.Controlstrategyparameterdesignoftheflybackcon