Kodi kusankha MOSFET?

Pali mitundu iwiri ya MOSFETs, N-channel ndi P-channel. Mu Power Systems,Zithunzi za MOSFETzitha kuonedwa ngati zosinthira zamagetsi. Kusintha kwa N-channel MOSFET kumachita pamene magetsi abwino akuwonjezeredwa pakati pa chipata ndi gwero. Pamene mukuyendetsa, madzi amatha kuyenda kudzera pakusintha kuchokera ku drain kupita kugwero. Pali kukana kwamkati pakati pa kukhetsa ndi gwero lotchedwa on-resistance RDS(ON).

 

MOSFET monga gawo lofunikira pamagetsi, Guanhua Weiye amakuwuzani momwe mungasankhire moyenera molingana ndi magawo?

I. Kusankha Channel

Gawo loyamba pakusankha chida choyenera cha kapangidwe kanu ndikuzindikira ngati mungagwiritse ntchito MOSFET ya N-channel kapena P-channel. pamagetsi, MOSFET imakhazikika ndipo katunduyo amalumikizidwa ndi voltage ya thunthu pomwe MOSFET imapanga chosinthira chamagetsi chotsika. Ma MOSFET a N-channel amayenera kugwiritsidwa ntchito posinthira mbali yamagetsi yotsika chifukwa choganizira mphamvu yamagetsi yomwe imafunika kuzimitsa kapena kuyatsa chipangizocho. Kusintha kwamphamvu kwamagetsi kumayenera kugwiritsidwa ntchito pamene MOSFET ilumikizidwa ndi basi ndi kulumikiza pansi.

 

II. Kusankha Voltage ndi Current

Kukwera kwamagetsi ovotera, kumakwera mtengo wa chipangizocho. Malinga ndi zochitika zenizeni, mphamvu yamagetsi iyenera kukhala yayikulu kuposa voltage ya trunk kapena basi. Pokhapokha ngati ingapereke chitetezo chokwanira ku kulephera kwa MOSFET. Posankha MOSFET, mphamvu yayikulu kwambiri yochokera ku drain kupita kugwero iyenera kutsimikizika.

Mu mosalekeza conduction mode, theMOSFETili m'malo okhazikika, pamene magetsi akudutsa mosalekeza pachipangizocho. Ma pulse spikes ndi pamene pali mafunde akulu (kapena mafunde apamwamba) akuyenda kudzera pa chipangizocho. Pamene pazipita panopa anatsimikiza pansi pazimenezi, ingosankha chipangizo kuti angathe kupirira pazipita panopa.

 

Chachitatu, kutayika kwa conduction

Chifukwa kukana kumasiyana ndi kutentha, kutayika kwa mphamvu kumasiyana molingana. Pamapangidwe osunthika, kugwiritsa ntchito magetsi otsika kumakhala kofala, pomwe pakupanga mafakitale, magetsi okwera amatha kugwiritsidwa ntchito.

 

Zofunikira za Thermal System

Pazofunika kuziziritsa dongosolo, Korona Padziko Lonse akukumbutsani kuti pali zochitika ziwiri zosiyana zomwe ziyenera kuganiziridwa, zovuta kwambiri komanso zenizeni. Gwiritsani ntchito kuwerengera koyipa kwambiri chifukwa chotsatirachi chimapereka malire okulirapo achitetezo ndipo angatsimikizire kuti dongosololi silingalephereke.

TheMOSFETikusintha pang'onopang'ono ma triode m'mabwalo ophatikizika chifukwa cha kuchepa kwa mphamvu yamagetsi, magwiridwe antchito okhazikika, komanso kukana kwa radiation. Koma akadali wosakhwima kwambiri, ndipo ngakhale ambiri aiwo ali kale ndi ma diode otetezedwa, amatha kuonongeka ngati sanasamalidwe. Choncho, ndi bwino ayenera kusamala mu ntchito komanso.