Ta yaya MOSFETs ke aiki?

1, MOSFETgabatarwa

FieldEffect Transistor gajarta (FET)) taken MOSFET. ta ƙananan adadin masu ɗaukar kaya don shiga cikin tafiyar da zafi, wanda kuma aka sani da transistor-pole. Yana da nau'in nau'in nau'in wutar lantarki mai sarrafa wutar lantarki. Akwai juriya na fitarwa yana da girma (10 ^ 8 ~ 10 ^ 9Ω), ƙaramar amo, ƙarancin wutar lantarki, kewayon a tsaye, mai sauƙin haɗawa, babu wani abu na rushewa na biyu, aikin inshora na teku mai faɗi da sauran fa'idodi, yanzu ya canza. transistor bipolar da wutar lantarki junction transistor na masu haɗin gwiwa masu ƙarfi.

2, MOSFET halaye

1, MOSFET shine na'urar sarrafa wutar lantarki, ta hanyar VGS (kofar wutar lantarki) ID mai kulawa (magudanar ruwa);

2, MOSFETfitarwa DC iyakacin duniya karami ne, don haka juriya na fitarwa yana da girma.

3, shi ne aikace-aikacen ƙananan adadin masu ɗaukar nauyi don gudanar da zafi, don haka yana da ma'auni mafi kyau na kwanciyar hankali;

4, ya ƙunshi hanyar ragewa na rage yawan wutar lantarki ya fi ƙanƙanta fiye da triode ya ƙunshi hanyar raguwa na raguwa;

5, MOSFET anti-iradiation ikon;

6, saboda rashin aiki mara kyau na watsawar oligon da ke haifar da barbashi na amo, don haka ƙarar ta ragu.

3. MOSFET aiki manufa

MOSFETka'idar aiki a cikin jumla ɗaya, shine "magudanar ruwa - tushen tsakanin ID ɗin da ke gudana ta hanyar tashar don ƙofar da tashar tsakanin pn junction da aka kafa ta hanyar bias na gate ƙarfin lantarki master ID", don zama daidai, ID yana gudana ta cikin nisa. na hanya, wato, tashar tashoshi na yanki, shine canji a cikin juyayi na baya na pn junction, wanda ke haifar da raguwa mai lalacewa Dalilin daɗaɗɗen kulawar bambancin. A cikin tekun da ba a cika ba na VGS = 0, tun da fadada tsarin canji ba shi da girma sosai, bisa ga ƙari na filin maganadisu na VDS tsakanin magudanar ruwa, wasu electrons a cikin teku mai tushe suna janye ta hanyar magudanar ruwa, watau, akwai aikin ID na DC daga magudanar ruwa zuwa tushen. Matsakaicin girman da aka faɗaɗa daga ƙofar zuwa magudanar ruwa yana sanya gaba ɗaya jikin tashar ya zama nau'in toshewa, ID cike. Kira wannan fom a ɗan tsinke. Alamar juzu'in canjin canji zuwa tashar gabaɗayan toshewa, maimakon ƙarfin DC an yanke.

Saboda babu motsi na electrons da ramuka kyauta a cikin madaurin canji, yana da kusan kaddarorin insulating a cikin tsari mai kyau, kuma yana da wahala ga janar na yanzu ya gudana. Amma sai filin lantarki tsakanin magudanar ruwa - tushe, a zahiri, magudanar canji guda biyu suna tuntuɓar magudanar ruwa da sandar ƙofa kusa da ƙananan ɓangaren, saboda filin lantarki yana jan electrons masu sauri ta hanyar canjin canjin. Ƙarfin filin drift kusan koyaushe yana samar da cikar wurin ID.

Da'irar tana amfani da haɗin haɗin MOSFET mai haɓaka P-tashar da ingantaccen tashar N-tashar MOSFET. Lokacin da shigarwar ya yi ƙasa, tashar P-tashar MOSFET tana gudanar da fitarwa kuma an haɗa fitarwa zuwa madaidaicin tashar wutar lantarki. Lokacin da shigarwar ya yi girma, MOSFET ta tashar N-tashar tana gudanarwa kuma an haɗa fitarwa zuwa ƙasa mai samar da wutar lantarki. A cikin wannan da'irar, MOSFET-tashar P-tashar da MOSFET N-channel ko da yaushe suna aiki a cikin saɓanin jihohi, tare da jujjuya abubuwan shigarsu da abubuwan da aka fitar.