Indlela yokukhetha i-MOSFET?

Kukho iindidi ezimbini ze-MOSFETs, i-N-channel kunye ne-P-channel. Kwiinkqubo zamandla,Ii-MOSFETsinokuthathwa njengokutshintsha kombane. Ukutshintshwa kwe-N-channel MOSFET kuqhuba xa i-voltage echanekileyo yongezwa phakathi kwesango kunye nomthombo. Ngelixa uqhuba, umsinga unokuhamba ngokutshintsha ukusuka kumjelo ukuya kumthombo. Kukho ukuchasana kwangaphakathi phakathi komsele kunye nomthombo obizwa ngokuba yi-RDS (ON) yokumelana.

 

I-MOSFET njengenxalenye esisiseko yenkqubo yombane, i-Guanhua Weiye ikuxelela indlela yokwenza ukhetho olufanelekileyo ngokweeparamitha?

I. UkuKhethwa kweSitishi

Inyathelo lokuqala ekukhetheni isixhobo esichanekileyo kuyilo lwakho kukuqinisekisa ukuba usebenzisa i-N-channel okanye i-P-channel MOSFET. kwizicelo zamandla, i-MOSFET ibekwe phantsi kwaye umthwalo uqhagamshelwe kumbane we-trunk xa i-MOSFET isenza iswitsha esecaleni ene-voltage ephantsi. Ii-MOSFET ze-N-channel kufuneka zisetyenziswe ekutshintsheni i-voltage ephantsi kwicala lombane ngenxa yoqwalaselo lombane ofunekayo ukucima okanye ukulayita isixhobo. Ukutshintshela ecaleni kwamandla ombane aphezulu kufuneka kusetyenziswe xa iMOSFET iqhagamshelwe kwibhasi kunye noqhagamshelo lomhlaba wokulayisha.

 

II. Ukukhetha iVoltage kunye neyangoku

Ukuphakama kombane olinganisiweyo, ixabiso eliphezulu lesixhobo. Ngokwamava asebenzayo, umbane olinganisiweyo kufuneka ube mkhulu kunombane we-trunk okanye umbane webhasi. Kungoko kuphela apho inokubonelela ngokhuseleko olwaneleyo ngokuchasene nokusilela kwe-MOSFET. Xa ukhetha i-MOSFET, owona mbane uphezulu ukusuka kwidreyini ukuya kumthombo kufuneka umiselwe.

Kwimo yokuqhuba eqhubekayo, iI-MOSFETikwimo ezinzileyo, xa umsinga udlula ngokuqhubekayo kwisixhobo. I-Pulse spikes kuxa kukho amaza amakhulu (okanye amaza omoya) aqukuqela kwisixhobo. Emva kokuba ubuninzi bangoku bunqunywe phantsi kwezi meko, khetha nje isixhobo esinokumelana nobuninzi bangoku.

 

Okwesithathu, ilahleko yokuqhuba

Ngenxa yokuba i-on-resistance iyahluka kunye nobushushu, ilahleko yamandla iya kwahluka ngokulinganayo. Kuyilo oluphathwayo, ukusetyenziswa kwamandla ombane asezantsi kuxhaphake kakhulu, ngelixa kuyilo lwamashishini, amandla ombane aphezulu angasetyenziswa.

 

Iimfuno ze-Thermal zeNkqubo

Ngokuphathelele kwiimfuno zokupholisa inkqubo, iCrown Worldwide ikukhumbuza ukuba kukho iimeko ezimbini ezahlukeneyo ekufuneka ziqwalaselwe, eyona meko imbi kakhulu kunye neyokwenyani. Sebenzisa isibalo esibi kakhulu kuba esi siphumo sibonelela ngomda omkhulu wokhuseleko kwaye sinokuqinisekisa ukuba inkqubo ayiyi kusilela.

II-MOSFETngokuthe ngcembe ithatha indawo ye-triode kwiisekethe ezihlanganisiweyo ngenxa yokusetyenziswa kwayo okuphantsi kwamandla, ukusebenza okuzinzileyo, kunye nokumelana nemitha. Kodwa i-ethe-ethe kakhulu, kwaye nangona uninzi lwazo sele zinee-diode zokukhusela ezakhelwe ngaphakathi, zinokonakala ukuba azikhathalelwanga. Ngoko ke, kungcono ukuba ulumke kwisicelo ngokunjalo.