光藕的工作原理[]（the working principle of [] coupling）

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1、光藕的工作原理[1]（Theworkingprincipleof[1]coupling）Experimentforty-fourapplicationofoptocouplerandotherisolateddetectiondevices(signalandsystem-PowerElectronics-detectiontechnologycomprehensiveexperiment)First,theexperimentalprinciple1.optocoupleranditsprincipleOptocoupler(opticalcoupler)isusedtotran

2、smittheelectricalsignalbycouplingtheinputsignaltotheoutputendwithlightasthemediumUsually,theemitter(infraredemittingdiodeLED)ispackagedwiththelightreceivingdevice(photosensitivesemiconductortube)Whentheelectricsignalisaddedtotheinputend,thelightemittedbytheilluminatorisconnectedwiththelightrec

3、eivingdeviceAfterthelightisgenerated,thephotoelectricflowisproducedandflowoutfromtheoutput,soastorealizethe"electriclightelectricity"conversion.InputandoutputTherefore,itiswidelyusedincircuitsrequiringsignalisolation.Becauseofitssmallsize,longlife,nocontact,stronganti-interferenceability,insul

4、ationbetweenoutputandinput,one-wayIthasbeenwidelyusedincircuitbecauseofitshighsignalfrequencyandtransmissionsignal.Optocouplerhasavarietyoftransistor,Darlington,thyristor,magneticeffecttransistorandotherformsofoutput.Theprincipleoftheoptocoupleristhesameastheisolationtransformerinthetransmissi

5、onsignal,buttheisolationtransformerisdependentonthemagneticfieldTotransmitsignalsorenergytothesecondaryside,usuallyonlytopassacertainfrequencyofalternatingsignals;andoptocouplerisbeneficialTheopticalpathisusedtocompletethetransmissionofinformation,aslongasthereisacertainintensityofcurrentflowi

6、ngthroughthelight-emittingdiodeontheprimaryside(ACorDC),Thephotosensitivediode/triodecanbetransmittedtothesubsidethroughtheopticalpathtorealizetheisolationandtransmissionofthesignalsSignalscanbeeitherACorDCsignals.Becauseofitsnonlinearity,theusualoptocouplerislimitedtosmallsignalsofhigherfrequ

7、encyinanalogcircuitsIsolatedtransmission.Ordinaryoptocouplercanonlytransmitdigital(switch)signal,notSuitablefortransmissionanalogsignals.Inrecentyears,linearopticalcouplershavebeendevelopedfortransmissionThechanginganalogvoltageoranalog