I-Demystifying Reverse Recovery kuma-MOSFET Body Diodes

Emkhakheni we-electronics, ama-MOSFETs (i-Metal-Oxide-Semiconductor Field-Effect Transistors) avele njengezingxenye ezitholakala yonke indawo, aziwa ngokusebenza kahle kwawo, isivinini sokushintsha, nokulawula. Nokho, isici esingokwemvelo sama-MOSFET, i-body diode, sethula into eyaziwa ngokuthi ukutakula okuhlanekezelwe, okungaba nomthelela ekusebenzeni kwedivayisi nokwakheka kwesekethe. Lokhu okuthunyelwe kwebhulogi kudingida umhlaba wokuhlehla kokululama kuma-diode omzimba we-MOSFET, kucwaningwa indlela yayo, ukubaluleka, nemithelela yezinhlelo zokusebenza ze-MOSFET.

Ukwembula Indlela Yokubuyisela Okuhlehlayo

Uma i-MOSFET icishiwe, i-current egeleza esiteshini sayo iphazamiseka kungazelelwe. Kodwa-ke, i-diode yomzimba we-parasitic, eyakhiwe isakhiwo esingokwemvelo se-MOSFET, yenza i-current reverse njengoba inkokhiso egciniwe esiteshini ihlangana kabusha. Lesi samanje esihlehlayo, esibizwa ngokuthi i-reverse recovery current (Irrm), iya kubola kancane kancane ngokuhamba kwesikhathi ize ifike kuqanda, okuphawula ukuphela kwesikhathi sokuhlehla sokutakula (trr).

Izinto Ezithonya Ukubuyiselwa Okuhlehlayo

Izici zokuhlehla zokululama zama-diode omzimba we-MOSFET zithonywa izici ezimbalwa:

Isakhiwo Se-MOSFET: Ijiyomethri, amazinga e-doping, kanye nezakhiwo ezibonakalayo zesakhiwo sangaphakathi se-MOSFET zidlala indima ebalulekile ekunqumeni i-Irrm ne-trr.

Izimo Zokusebenza: Ukuziphatha kokuhlehla kokululama kuphinde kuthinteke izimo zokusebenza, njenge-voltage esetshenzisiwe, isivinini sokushintsha, nezinga lokushisa.

I-Circuitry yangaphandle: I-circuitry yangaphandle exhunywe ku-MOSFET ingaba nomthelela enqubweni yokuhlehla yokutakula, okuhlanganisa ukuba khona kwamasekhethi e-snubber noma imithwalo ye-inductive.

Imithelela Yokubuyiswa Okuhlehla Kwezinhlelo Zokusebenza ze-MOSFET

Ukubuyisela ukubuyisela emuva kungangenisa izinselele ezimbalwa ezinhlelweni zokusebenza ze-MOSFET:

Ama-Voltage Spikes: Ukwehla okungazelelwe kokubuyela emuva ngesikhathi sokuhlehla kungase kukhiqize ama-voltage spikes angadlula amandla kagesi e-MOSFET, okungase kulimaze idivayisi.

Ukulahleka Kwamandla: Isimanje sokuhlehla sokubuyisela sihlakaza amandla, okuholela ekulahlekeni kwamandla kanye nezinkinga zokushisisa ezingaba khona.

Umsindo Wesekhethi: Inqubo yokuhlehla yokutakula ingafaka umsindo kusekethe, ithinte ubuqotho besignali futhi ibangele ukungasebenzi kahle kumasekhethi azwelayo.

Ukunciphisa Imiphumela Yokubuyisela Okuhlehlayo

Ukuze unciphise imiphumela emibi yokubuyisela emuva, izindlela ezimbalwa zingasetshenziswa:

Izifunda ze-Snubber: Amasekhethi e-Snubber, ngokuvamile ahlanganisa ama-resistors nama-capacitor, angaxhunywa ku-MOSFET ukuze adambise ama-voltage spikes futhi anciphise ukulahleka kwamandla ngesikhathi sokuhlehla.

Amasu Okushintsha Okuthambile: Amasu okushintsha okuthambile, njengokumodareyitha kobubanzi be-pulse-width (PWM) noma ukushintsha kwe-resonant, angalawula ukushintsha kwe-MOSFET kancane kancane, anciphise ubukhali bokuhlehla kokuhlehla.

Ukukhetha ama-MOSFET ane-Low Reverse Recovery: Ama-MOSFET ane-Irrm ephansi kanye ne-trr angakhethwa ukuze kuncishiswe umthelela wokuhlehla kokuhlehla ekusebenzeni kwesekethe.

Isiphetho

Ukubuyisela ukubuyisela emuva kumadiode omzimba we-MOSFET kuyisici esingokwemvelo esingaba nomthelela ekusebenzeni kwedivayisi nokwakheka kwesekhethi. Ukuqonda indlela, izici ezinomthelela, kanye nemithelela yokubuyisela emuva kubalulekile ekukhetheni ama-MOSFET afanelekile nokusebenzisa amasu okunciphisa ukuze kuqinisekiswe ukusebenza kwesekethe nokwethembeka. Njengoba ama-MOSFET eqhubeka nokudlala indima ebalulekile ezinhlelweni ze-elekthronikhi, ukubhekana nokuhlehla kabusha kuhlala kuyisici esibalulekile somklamo wesifunda nokukhetha idivayisi.