Yuav ua li cas ua rau NPN transistor?

1, Lub hauv paus ntsiab lus ntawm NPN transistor
Ua ntej, cia peb luv luv xyuas cov qauv thiab cov hauv paus ntsiab lus ntawm NPN transistors. NPN transistors muaj peb cheeb tsam doped: ob N-hom semiconductor cheeb tsam (emitter thiab collector) sandwiching P-hom semiconductor cheeb tsam (puag). Nyob rau hauv ib txwm ua haujlwm, ib qho kev tsis ncaj ncees rau pem hauv ntej yog tsim los ntawm cov emitter thiab lub hauv paus, thaum lub zog thim rov qab yog tsim los ntawm lub hauv paus thiab cov khoom siv. Lub xeev tsis ncaj ncees no tso cai rau cov khoom siv hluav taws xob los ntawm cov emitter los ntawm lub hauv paus mus rau lub collector, tsim cov khoom siv tam sim no, uas yog qhov tshwm sim ntawm lub hauv paus tam sim no.
2, Txoj kev ua rau NPN transistor
1. Forward biased puag
Txoj hauv kev zoo tshaj plaws thiab ncaj qha los ua rau NPN transistors yog siv lub zog rau pem hauv ntej rau lub hauv paus. Thaum qhov hluav taws xob nruab nrab ntawm lub hauv paus thiab cov emitter ntau dua qhov hluav taws xob conduction ntawm PN junction (feem ntau nyob ib ncig ntawm 0.7V), electrons los ntawm lub emitter yuav hla PN hlws ris mus rau hauv lub hauv paus cheeb tsam thiab ceev ceev los ntawm lub hauv paus hluav taws xob. teb ua ntej diffusing mus rau hauv lub collector cheeb tsam, tsim ib tug collector tam sim no. Los ntawm kev tswj qhov loj ntawm lub hauv paus voltage, qhov loj ntawm cov khoom siv tam sim no tuaj yeem hloov kho kom ua rau thiab tswj NPN transistors.
2. Txoj kev txhaj tshuaj tam sim no
Ntxiv rau kev siv hluav taws xob ncaj qha, NPN transistors kuj tuaj yeem tshwm sim los ntawm kev txhaj tshuaj tam sim no rau hauv lub hauv paus. Txoj kev no feem ntau yog siv rau hauv cov xwm txheej uas yuav tsum tau muaj kev tswj xyuas meej ntawm tam sim no, xws li tam sim no qhov chaw circuits lossis precision amplifier circuits. Los ntawm kev tswj hwm qhov loj ntawm qhov tam sim no txhaj rau hauv lub hauv paus, qhov kev hloov pauv ntawm cov khoom siv tam sim no tuaj yeem ua tiav.
3. Lub teeb tshwm sim
Hauv qee hom tshwj xeeb ntawm NPN transistors (xws li phototransistors), lub transistor kuj tuaj yeem tshwm sim los ntawm kev teeb pom kev zoo. Cov transistors no muaj cov khoom siv hluav taws xob (xws li photodiode lossis photoresistor) sab hauv, uas tsim cov duab hluav taws xob thaum lub teeb ci rau ntawm cov khoom siv photosensitive thiab txhaj rau hauv lub hauv paus, ua rau lub transistor. Txoj kev teeb pom kev zoo muaj ntau yam kev siv hauv thaj chaw xws li kev tshawb pom photoelectric thiab lub teeb tswj cov keyboards.
3, Cov ntaub ntawv siv tau
1. Hloov Circuit Court
Hauv kev hloov hluav taws xob, NPN transistors feem ntau yog siv los ua hluav taws xob hloov hluav taws xob los tswj qhov qhib / tawm ntawm Circuit Court. Los ntawm kev siv qhov tsim nyog rau pem hauv ntej kev tsis sib haum xeeb lossis kev txhaj tshuaj tam sim no rau lub hauv paus, NPN transistors tuaj yeem hloov tau los ntawm lub xeev tawm mus rau hauv lub xeev (lossis lwm qhov), yog li tswj lub xeev ntawm / tawm ntawm lub voj voog. Piv txwv li, nyob rau hauv kev tswj Circuit Court ntawm LED teeb, NPN transistors tuaj yeem siv los hloov cov ntsiab lus los tswj lub teeb / tawm ntawm LED teeb.
2. Amplification Circuit Court
Nyob rau hauv amplification circuits, NPN transistors yog siv los ua amplifiers los txhim kho lub teeb liab los ntawm amplifying lub amplitude ntawm lub input teeb liab. Los ntawm kev kho qhov loj ntawm lub hauv paus voltage lossis tam sim no, qhov nce ntawm lub amplifier (piv txwv li kev sib raug zoo ntawm cov teeb liab tawm thiab cov teeb liab tawm tswv yim) tuaj yeem tswj tau. NPN transistors ua lub luag haujlwm tseem ceeb hauv suab amplifiers, RF amplifiers, thiab lwm yam kev siv.
3. Tsav Circuit Court
Hauv kev tsav tsheb, NPN transistors yog siv los tsav ntau yam khoom siv thauj khoom xws li lub cev muaj zog, relays, thiab lwm yam. Los ntawm kev siv cov teeb liab tsim nyog (xws li mem tes signals lossis logic theem teeb liab) rau hauv paus, lub xeev hloov ntawm NPN transistors tuaj yeem tswj tau. los tsav kev ua haujlwm ntawm cov khoom siv thauj khoom. Piv txwv li, nyob rau hauv lub cev muaj zog tsav circuits, NPN transistors tuaj yeem siv los tswj lub cev muaj zog pib, nres, thiab tig ua haujlwm.
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