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1、小功率电子镇流器工作原理及故障浅析（Operationprincipleandfaultanalysisofsmallpowerelectronicballast）OperationprincipleandfaultanalysisofsmallpowerelectronicballastElectronicballastsforenergysavinglampsareefficient,energy-saving,flickerfreeandnoiseless.Theycanalsobestartedatl
2、owvoltageandhaveawiderangeofapplications.However,duetotheselectionanddesignofcomponents,therateoffailureishigher.Thestructureandworkingprincipleofelectronicballastsforlowpowerenergy-savinglampsusedindailylifearediscussed,themultiplefaultreasonofseveraltypic
3、alandcommonanalysis,inordertoquicklyfindthepointoffailureandimprovement.Keywordselectronicballast;operatingprinciple;resonancefault;Asthestartingandlimitingdevice,theelectronicballasthastheadvantagesofsimplicity,highefficiency,excellentstartingperformance,n
4、onoise,highreliabilityandremarkablepowersavingeffect.Butinpracticaluse,duetothechoiceofcomponentsanddesignfactors,thefailurerateofelectronicballastsisalsohigher.Thefollowingmainlyintroducestheworkingprincipleofsmallpowersavinglampelectronicballast,andanalyz
5、esitstypicaltypicalfaults.1electronicballastcircuitstructureandworkingprincipleThediagrambelowshowsthecircuitdiagramofacertainbrandof22Welectronicballast.Itismainlycomposedofrectifierfiltercircuit,startupcircuit,invertercircuit,seriesresonantcircuitandprote
6、ctioncircuit.D1toD4,C1andC2toformabridgerectifierandfiltercircuit,atthesametime,Cisalsoinvolvedintheworkofthe1oscillationcircuit;R1,R2,C3,D3,DB3startcircuitforprovidinganexternaltriggersignal;T1,T2,R3,R4,R5L,R6,1,L2,L3etc.theinvertercircuittogeneratehighfre
7、quencyvoltageandcurrentofmorethan20kHz,including3LforlooptransformerprimarywindingTr,L1,L2forthesecondarywinding;C5,Lseriesresonantcircuit;D5,D7,D8,D9,D4,R7,D8Protectioncircuit.Workingprinciple:aftertheelectronicballastisenergized,the220VACpowersupplypasses
8、throughtheD1toD4bridgerectifier,andthenpassesthroughtheC1andC2filterstoobtaintheno-loadDCvoltageofabout311V,andtheactualvoltageisabout300V.AcurrentflowingthroughtheR1,R2begantoC3charging,whenthechargin
