Kwindawo ye-electronics, i-MOSFETs (i-Metal-Oxide-Semiconductor Field-Effect Transistors) ziye zavela njengezinto ezihlala kuyo yonke indawo, zidume ngokusebenza kwazo kakuhle, isantya sokutshintsha, kunye nokulawula. Nangona kunjalo, uphawu lwendalo lwe-MOSFETs, i-diode yomzimba, yazisa into eyaziwa ngokuba yi-reverse recovery, enokuthi ibe nefuthe ekusebenzeni kwesixhobo kunye noyilo lwesekethe. Esi sithuba sebhlog sijonga kwihlabathi lokubuyisela umva umva kwiidiode zomzimba ze-MOSFET, kuphononongwa indlela ezisebenza ngayo, ukubaluleka, kunye neziphumo kwizicelo ze-MOSFET.
Ukutyhilwa kweMechanism yokuBuyisa umva
Xa i-MOSFET icinyiwe, umsinga ohamba ngejelo layo uphazamiseka ngesiquphe. Nangona kunjalo, i-parasitic body diode, eyenziwe yimo yendalo ye-MOSFET, iqhuba i-reverse current njengoko intlawulo egciniweyo kwitshaneli iphinda ihlangane. Le yangoku ibuyela umva, eyaziwa ngokuba yi-reverse recovery current (Irrm), ibola ngokuthe ngcembe ngokuhamba kwexesha de ifike ku-zero, iphawula ukuphela kwexesha lokubuyisela umva (trr).
Izinto eziPhembelela ukuBuyisa uReverse
Iimpawu zokubuyisela umva kwiidiode zomzimba we-MOSFET ziphenjelelwa zizinto ezininzi:
Ulwakhiwo lwe-MOSFET: Ijiyometri, amanqanaba edoping, kunye neepropathi zemathiriyeli zolwakhiwo lwangaphakathi lwe-MOSFET zidlala indima ebalulekileyo ekumiseleni i-Irrm kunye ne-trr.
IiMeko zokuSebenza: Ukuziphatha kokubuyisela umva kwakhona kuchatshazelwa ziimeko zokusebenza, ezifana nombane osetyenzisiweyo, isantya sokutshintsha, kunye nobushushu.
ISekethe yaNgaphandle: Iisekethe zangaphandle eziqhagamshelwe kwi-MOSFET zinokuphembelela inkqubo yokubuyisela umva, kubandakanywa ubukho beesekethe ze-snubber okanye imithwalo yokufundisa.
Iimpembelelo zokuBuyiselwa uBuyiselo kwiZicelo zeMOSFET
Ukubuyisela umva kwakhona kunokwazisa imingeni emininzi kwizicelo ze-MOSFET:
I-Voltage Spikes: Ukuhla ngequbuliso kumbane obuya umva ngexesha lokubuyisela umva kunokuvelisa i-voltage spikes ezinokudlula i-voltage ye-MOSFET, enokuthi yonakalise isixhobo.
Ilahleko yaMandla: Ukubuyisela umva ngoku kutshabalalisa amandla, okukhokelela ekulahlekeni kwamandla kunye nemiba enokubakho yokufudumeza.
Ingxolo yeSekethe: Inkqubo yokubuyisela umva inokujova ingxolo kwisekethe, ichaphazela ingqibelelo yesiginali kwaye inokubangela ukungasebenzi kakuhle kwiisekethe ezibuthathaka.
Ukunciphisa iZiphumo zokuBuyisa uReverse
Ukunciphisa iziphumo ezibi zokubuyisela umva, iindlela ezininzi zinokusetyenziswa:
IiSekethe ze-Snubber: Iisekethe ze-Snubber, ezibandakanya i-resistors kunye ne-capacitors, zinokuqhagamshelwa kwi-MOSFET ukuthoba i-voltage spikes kunye nokunciphisa ilahleko yamandla ngexesha lokubuyisela umva.
Ubuchwephesha boTshintsho oluthambileyo: Ubuchule bokutshintsha okuthambileyo, okufana ne-pulse-width modulation (PWM) okanye ukutshintshelwa kwe-resonant, kunokulawula ukutshintshwa kwe-MOSFET ngokuthe ngcembe, kuncitshiswe ubungqongqo bokubuyisela umva.
Ukukhetha ii-MOSFETs ezine-Low Reverse Recovery: Ii-MOSFET ezine-Irrm esezantsi kunye ne-trr zinokukhethwa ukunciphisa impembelelo yokubuyisela umva ekusebenzeni kwesekethe.
Ukuqukumbela
Ukubuyisela umva ukubuyisela umva kwiidiode zomzimba ze-MOSFET luphawu olunokuthi lube nefuthe ekusebenzeni kwesixhobo kunye noyilo lwesekethe. Ukuqonda indlela yokusebenza, izinto ezinempembelelo, kunye neziphumo zokubuyisela umva umva kubalulekile ekukhetheni ii-MOSFET ezifanelekileyo kunye nokusebenzisa iindlela zokunciphisa ukuqinisekisa ukusebenza kakuhle kwesekethe kunye nokuthembeka. Njengoko ii-MOSFET ziqhubeka nokudlala indima ebalulekileyo kwiinkqubo zombane, ukujongana nokubuyisela umva kuhlala kungumba obalulekileyo woyilo lwesekethe kunye nokukhetha izixhobo.
Ixesha lokuposa: Jun-11-2024