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Topologie di alimentazione

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1 Introduzione a Embedded System DesignProfessor Dhananjay V. Gadre (NSUT) & Badri SubudhiIndian Institute of Technology, JammuLecture 10Power Supply for Embedded Systems ContinuedHello, welcometoanewsessionamentisonlinecourseonIntroductiontoEmbeddedSystemDesign. (Fare Slide Time: 0 :45) Così, inthisconfiguration, ifwehavethetransistor, youwantthetransistortohandlemoreamountofcurrent, thenyoucanusewhatiscalledasaDarlingtonpair, whereyouusetwotransistortomultiplytebetaandtisipicalconfigurationofaDarlingtonpairhere.Thisbecomesyourcollector, thisbecomesbaseandthisbecomesyouremitter.HereistheDarlingtonpairwe utilizzavano due transistor e il guadagno efficace, il guadagno attuale di questo transistor.Ifthisisthegain, beta1isthegainofthefirsttransistorandthisisthecurrentgainonthesecondtransistor.Theeffectivegainbecomesbeta1intobeta2.Andsothisconfigurationcanhandlemuchlargercurrent.Tuttavia, pleasenotethatnowthebaseemittervoltageisnolongerVBEitisVBE1forthefirsttransistor, plusVBE2forthesecondtransistor, andpertanto, ifyouare goingtousetheDarlingtonversionepowersupplyconfiguration, theVouthastoovercomethis.Andsotheoutputvoltageoftheopampwillbesuchisrequisment.AndsoifIamgoingtousethispowersupplyconfigurationandIwantmorecurrent, che singletransistor potrebbe non fornirmi il guadagno attuale richiesto e potrei utilizzare questa coppia Darlington. (Fare riferimento Slide Tempo: 2 :38) Tuttavia, ancora, thispowersupplysofferenze sfromaninabilitytoprovidestanyshortcircuitingattheoutput.Andsowemustbuildinsomemechanismsocheshortattheoutputdoesnotendupdestroyingthepowersupplyandthewayitisraggiunedisthroughiscircuilì, throughtheintroductionofthistransistorT2,thisensuresthatthecurrentisnevergoingtoexceed un certo importi t.Inthiscase, themaximumcurrentthatthispowersupplywillprovideisequaltotheVBEoftransistorT2dividedbythevalueofR2 .Quindi, ifthisvoltageissay0.7voltsandifyouchooseR2tobe1ohmthatmeansthispowersupplycanprovide700milliamperesofcurrent.Whathappensifyoushortit?IfIshortthispowersupply, sì, thecurrentwilltrytoexceed700milliamperes, atwhichpointitwillenableT2itwillturnT2onanditwillprovideanalternativepathforthecurrentfromtheopampinsteadofgoingintoT1andgettingmagnifiedbyafactorof