Indlela yokufumanisa ukuba i-MOSFET ilungile okanye imbi?

Kukho iindlela ezimbini zokuxelela umahluko phakathi kweMOSFET elungileyo nembi:
Eyokuqala: ngokomgangatho yahlula izinto eziluncedo nezingeloncedoIi-MOSFETs

Okokuqala sebenzisa i-multimeter R × 10kΩ ibhloko (i-9V efakwe kwi-9V okanye i-15V ibhetri ehlaziywayo), ipeni elibi (elimnyama) eliqhagamshelwe kwisango (G), ipeni elihle (elibomvu) eliqhagamshelwe kumthombo (S). Ukuya kwisango, umthombo wentlawulo yebhetri ephakathi, ngokoi-multimeter inaliti inokuphambuka kancinci. Emva koko utshintshe kwi-multimeter R × 1Ω ibhloko,embi ipeni kumjelo (D), ipeni positive kumthombo (S), ixabiso multimeter ebhalwe ukuba ohm ezimbalwa umama, ibonisa ukuba MOSFET ilungile.

Indlela yokufumanisa ukuba i-MOSFET ilungile okanye imbi

Eyesibini: ukusombulula ngokomgangatho wombane we-MOSFETs yokuhlanganaI-multimeter iya kutsalelwa kwifayile ye-R × 100, ipeni ebomvu idibaniswe ngokungaqhelekanga kwi-tube yeenyawo, ipeni elimnyama lixhunywe kwelinye ityhubhu yeenyawo, ukwenzela ukuba unyawo lwesithathu luxhonywe emoyeni. Ukuba ufumanisa ukuba inaliti ine-wobble encinci, kuqinisekiswa ukuba unyawo lwesithathu lwesango. Ukufumana uqwalaselo olubaluleke ngakumbi lwesiphumo sokwenyani, kodwa kunye nokungcangcazela kwe-elektroniki kufutshane okanye ngokuchukumisa ngomnwe okujinga ezinyaweni zomoya, ukubona kuphela inaliti yokuphambuka okukhulu, oko kukuthi, ebonisa ukuba ukujinga ezinyaweni zomoya lisango. , ezinye iinyawo ezimbini zazingumthombo kunye nomsele.

Izizathu ezahlulayo:

Uxhathiso lwegalelo le-JFET lungaphezulu kwe-100MΩ, kwaye i-transconductance iphezulu kakhulu, xa isango elikhokelela kwisithuba semagnethi sangaphakathi kulula kakhulu ukuphembelela umqondiso wedatha ombane osebenzayo esangweni, ukuze umbhobho uthande ukuba phezulu, okanye uthambekele. ukuba on-off. Ukuba i-voltage yokungeniswa komzimba yongezwa ngokukhawuleza esangweni, kuba uphazamiseko oluphambili lwe-electromagnetic lunamandla, le meko ingasentla iya kubaluleka ngakumbi. Ukuba inaliti yemitha ngasekhohlo uphambuko olukhulu, egameni lombhobho ithande ukuba, idreyini-umthombo resistor RDS ukwandiswa, drain-umthombo ngoku isixa IDS ecuthiweyo. ngokuchaseneyo, inaliti yemitha ukuya ngasekunene kokuphambuka okukhulu, ebonisa ukuba umbhobho uvame ukucima, i-RDS ↓, IDS ↑. Nangona kunjalo, inaliti yemitha ekupheleni kweliphi icala lokuphambuka, kufuneka ixhomekeke kwiipali ezilungileyo nezingalunganga zombane owenziweyo (indlela efanelekileyo yombane osebenzayo okanye umva umva wombane osebenzayo) kunye nendawo yokusebenza yombhobho wentsimbi.
Izilumkiso:
(1) Uvavanyo lubonisa ukuba xa izandla zombini zikhuselwe kwiipali ze-D kunye ne-S kwaye kuphela isango elichukumisayo, inaliti ngokubanzi ijikijelwa ngasekhohlo. Nangona kunjalo, ukuba izandla zombini zichukumisa nganye ye-D, i-S-pole, kunye neminwe echukumisa isango, kunokwenzeka ukujonga ukuphambuka kwenaliti ngasekunene. Oyena nobangela ngumzimba wenani lezikhundla kunye nabaxhathisi kwi-MOSFET inesiphumo sendawo yesalathiso, ukuze ibe kwindawo yemeko yoxinzelelo.