MOSFETs a cikin Masu Kula da Motocin Lantarki

1, Matsayin MOSFET a cikin mai sarrafa abin hawa na lantarki

A cikin sauƙi mai sauƙi, motar tana motsawa ta hanyar fitarwa na yanzu naMOSFET, Mafi girman fitarwa na halin yanzu (domin hana MOSFET daga ƙonewa, mai sarrafawa yana da kariyar iyaka na yanzu), ƙarfin jujjuyawar motar, mafi ƙarfin haɓakawa.

 

2, da'irar sarrafawa na yanayin aiki na MOSFET

Bude tsari, kan jiha, kashe tsari, jihar yanke, yanayin lalacewa.

Babban hasara na MOSFET sun haɗa da canza hasara (akan kunnawa da kashewa), asarar gudanarwa, asarar yankewa (wanda ya haifar da ɗigogi a halin yanzu, wanda ba shi da komai), asarar makamashin kankara. Idan ana sarrafa waɗannan asara a cikin kewayon MOSFET mai jurewa, MOSFET za ta yi aiki yadda ya kamata, idan ta zarce kewayon jurewa, lalacewa za ta faru.

A sauya hasara ne sau da yawa girma fiye da conduction jihar asarar, musamman PWM ba a cikakken bude, a cikin bugun jini nisa modulation jihar (daidai da fara hanzari jihar na lantarki mota), da kuma mafi girma m jihar ne sau da yawa da conduction asarar ne. rinjaye.

3, manyan dalilanMOSlalacewa

Ƙarfafawa, babban halin yanzu da ke haifar da lalacewar zafin jiki mai girma (tsayawa mai girma na yanzu da kuma saurin bugun jini na yanzu wanda ke haifar da zafin jiki ya wuce ƙimar haƙuri); overvoltage, matakin magudanar ruwa ya fi ƙarfin rushewar wutar lantarki da raguwa; rugujewar kofa, yawanci saboda wutar lantarki ta gate ta lalace ta wajen waje ko na'urar tuƙi fiye da matsakaicin madaidaicin ƙarfin lantarki (gaba ɗaya na buƙatar ƙarfin ƙofar ƙofar yana buƙatar zama ƙasa da 20v), da kuma lalacewar wutar lantarki.

 

4, MOSFET ka'idar sauyawa

MOSFET na'ura ce da ke motsa wutar lantarki, muddin ƙofar G da matakin S don ba da wutar lantarki mai dacewa tsakanin matakin tushen S da D za su samar da da'irar gudanarwa tsakanin matakin tushe. Juriyar wannan tafarki na yanzu ya zama juriya na MOSFET na ciki, watau a kan juriya. Girman wannan juriya na ciki yana ƙayyade matsakaicin halin yanzu akan-jihar da keMOSFETguntu na iya jurewa (ba shakka, kuma yana da alaƙa da wasu dalilai, mafi dacewa shine juriya na thermal). Ƙananan juriya na ciki, mafi girma na halin yanzu.