Menene ka'idar aiki na MOSFET?

MOSFET (FieldEffect Transistor abbreviation (FET)) takeMOSFET. ta ƴan ƙaramin adadin masu ɗaukar kaya don shiga cikin ɗawainiyar thermal conductivity, wanda kuma aka sani da transistor junction multi-pole. An kasafta shi azaman na'ura mai sarrafa wutar lantarki ta Semi-conductor. Juriya na yau da kullun yana da girma (10 ^ 8 ~ 10 ^ 9 Ω), ƙaramar ƙararrawa, ƙarancin wutar lantarki, kewayon tsayayyen, mai sauƙin haɗawa, babu wani abin fashewa na biyu, aikin inshora na teku mai faɗi da sauran fa'idodi, yanzu ya canza bipolar junction transistor da ikon junction transistor na masu haɗin gwiwa masu ƙarfi.

Halayen MOSFET

Na farko: MOSFET ita ce na'urar sarrafa wutar lantarki, ta hanyar VGS (gaban wutar lantarki) zuwa babban ID (drain DC);

Na biyu:MOSFETOutput DC yana da ƙanƙanta sosai, don haka juriyarsa yana da girma sosai.

Na uku: ana amfani da 'yan dillalai don gudanar da zafi, don haka yana da ma'aunin kwanciyar hankali;

Hudu: ya ƙunshi raguwar hanyar rage wutar lantarki na ƙananan ƙididdiga don zama mafi ƙanƙanta fiye da transistor ya ƙunshi ƙananan hanyar rage wutar lantarki na ƙananan ƙididdiga;

Na biyar: MOSFET anti-iradiation iko;

Shida: saboda babu wani aiki mara kyau na tarwatsewar tsirarun da ke haifar da barbashi na hayaniya, saboda karar ba ta da yawa.

MOSFET ka'idar aiki

MOSFETka'idar aiki a cikin jumla ɗaya, wato, "magudanar ruwa - tushen tafiya ta hanyar tashar tsakanin ID, tare da lantarki da tashar tsakanin pn da aka gina a cikin wutar lantarki ta baya-baya don sarrafa ID". Mafi daidai, girman ID a fadin kewaye, wato, tashar tashoshi na yanki, shi ne ta hanyar pn junction counter-sonal bambance-bambancen, abin da ya faru na raguwar raguwa don fadada bambancin gwaninta na dalili. A cikin tekun da ba a cika ba na VGS = 0, haɓakar da aka nuna ba ta da girma sosai saboda, bisa ga filin maganadisu na VDS da aka ƙara tsakanin magudanar ruwa, wasu electrons a cikin tekun tushen suna cirewa ta hanyar magudanar ruwa. , watau, akwai aikin ID na DC daga magudanar ruwa zuwa tushen. Matsakaicin layin da ke faɗaɗa daga ƙofar zuwa magudanar ruwa zai samar da nau'in toshewar gabaɗayan tashar, ID cike. Koma zuwa wannan tsari azaman tsinke-kashe. Wannan yana nuna alamar canjin canjin ya hana dukkan tashar, kuma ba wai an yanke DC ba.

A cikin tsaka-tsakin tsaka-tsaki, saboda babu motsin kai na electrons da ramuka, a cikin ainihin nau'i na insulating halaye na kasancewar janar DC halin yanzu yana da wuyar motsawa. Duk da haka, filin maganadisu tsakanin magudanar ruwa - tushen, a aikace, magudanar ruwa na tsaka-tsaki guda biyu da sandar ƙofa a ƙasan hagu, saboda filin maganadisu na jan hankali na electrons masu saurin gudu ta hanyar canjin canji. Domin ƙarfin filin maganadisu kawai baya canza cikar wurin ID ɗin. Abu na biyu, VGS zuwa matsayi mara kyau yana canzawa, ta yadda VGS = VGS (kashe), sa'an nan kuma canjin canjin ya canza siffar rufe dukan teku. Kuma filin maganadisu na VDS yana da yawa a cikin jujjuyawar canjin yanayi, filin maganadisu wanda ke jan electron zuwa matsayin drift, idan dai kusa da sandar tushe na gajeriyar duk, wanda ya fi ta yadda wutar DC ba ta kasance ba. iya stagnate.