Game da ka'idar aiki na MOSFET

Akwai bambancin alamomin kewayawa da yawa da ake amfani da su don MOSFETs. Mafi yawan ƙira shine madaidaiciyar layi mai wakiltar tashar, layi biyu daidai da tashar da ke wakiltar tushen da magudanar ruwa, da kuma ɗan gajeren layi daidai da tashar da ke gefen hagu mai wakiltar ƙofar. Wani lokaci madaidaicin layin da ke wakiltar tashar kuma ana maye gurbin shi da karyar layi don bambanta tsakanin yanayin haɓakawamofet ko mosfet yanayin ragewa, wanda kuma aka raba shi zuwa N-channel MOSFET da P-channel MOSFET nau'ikan alamomin kewayawa iri biyu kamar yadda aka nuna a cikin adadi (alkilar kibiya ta bambanta).

MOSFET mai ƙarfi yana aiki ta manyan hanyoyi biyu:

(1) Lokacin da aka ƙara ingantaccen ƙarfin lantarki zuwa D da S (magudanar ruwa mai kyau, mai tushe) da UGS = 0, haɗin PN a cikin yankin P na jiki da yankin N magudanar yana jujjuya son rai, kuma babu wani wucewa na yanzu tsakanin D. da S. Idan aka ƙara ingantaccen ƙarfin wutar lantarki UGS tsakanin G da S, babu wata ƙofar da za ta gudana saboda ƙofar tana cikin insulated, amma ingantaccen ƙarfin lantarki a ƙofar zai tura ramukan daga yankin P da ke ƙasa, da kuma tsiraru. Za a jawo hankalin masu ɗaukar lantarki zuwa yanayin yankin P Lokacin da UGS ya fi wani nau'in ƙarfin lantarki UT, ƙaddamarwar electron a saman yankin P a ƙarƙashin ƙofar zai wuce ramin rami, don haka ya zama nau'in P-type semiconductor antipattern Layer N. - nau'in semiconductor; wannan magudanar ruwa ya samar da tashar N-type tsakanin magudanar ruwa da magudanar ruwa, ta yadda mahadar PN ta bace, tushen da magudanar ruwa, sannan kuma ID na yanzu yana gudana ta cikin magudanar. UT ana kiransa wutar lantarki mai kunnawa ko kuma wutar lantarki, kuma yayin da UGS ya wuce UT, yawancin ƙarfin tafiyarwa shine, kuma girman ID ɗin. Mafi girman UGS ya wuce UT, mafi ƙarfin aiki, mafi girman ID.

(2) Lokacin da D, S tare da ƙarfin lantarki mara kyau (tabbataccen tushen tushe, magudanar ruwa), haɗin PN yana gaba da son rai, daidai da diode na baya na ciki (ba shi da halayen amsa da sauri), wato,MOSFET ba shi da ikon toshewar baya, ana iya ɗaukarsa azaman ɓangarori masu juyawa.

By theMOSFET Ana iya ganin ka'idar aiki, gudanar da shi kawai ɗaya polarity diko da hannu a cikin conductive, don haka kuma aka sani da unipolar transistor.MOSFET drive ne sau da yawa dogara a kan samar da wutar lantarki IC da MOSFET sigogi don zaɓar da dace kewaye, MOSFET ne kullum amfani da sauyawa. wutar lantarki drive kewaye. Lokacin zana wutar lantarki mai sauyawa ta amfani da MOSFET, yawancin mutane suna la'akari da juriya, matsakaicin ƙarfin lantarki, da matsakaicin halin yanzu na MOSFET. Koyaya, sau da yawa mutane suna la'akari da waɗannan abubuwan ne kawai, don da'irar za ta iya aiki da kyau, amma ba shine mafita mai kyau ba. Don ƙarin ƙira, MOSFET kuma yakamata yayi la'akari da bayanan sigar sa. Don tabbataccen MOSFET, da'irar tuƙi, mafi girman halin yanzu na fitar da tuƙi, da sauransu, zai shafi canjin aikin MOSFET.