Isifundo se-MOSFET soMzimba weDiode yabaQalayo: Ukungena kwiLizwe leDiode yeParasitic

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, ii-MOSFETs zinophawu lwendalo, i-diode yomzimba, eyazisa zombini iingenelo kunye nemingeni enokubakho. Esi sifundo sinobuhlobo sabaqalayo sijonga kwihlabathi le-MOSFET diode yomzimba, sijonga iziseko zazo, iimpawu, kunye nokusetyenziswa okusebenzayo.

Ukutyhilwa kwe-MOSFET Body Diode

I-MOSFET body diode yi-intrinsic parasitic diode eyenziwe lulwakhiwo lwangaphakathi lwe-MOSFET. Ikhona phakathi komthombo kunye neetheminali zokuhambisa amanzi, kwaye isalathiso saso siqhelekile ngokuchasene nokuhamba kwangoku kwangaphandle nge-MOSFET.

Ukuqonda iSimboli kunye neempawu

Isimboli ye-MOSFET ye-diode yomzimba ifana ne-diode eqhelekileyo, kunye notolo olubonisa icala lokuhamba kwangoku. I-diode yomzimba ibonisa iimpawu ezininzi eziphambili:

Phambili ngoku: I-diode yomzimba inokuqhuba i-current kwi-front direction, efana ne-diode eqhelekileyo.

Ukubuyela umva kokuqhekeka kweVoltage: I-diode yomzimba ine-voltage ebuyela umva yokuqhekeka, ngaphaya koko iqhuba ngokugqithisileyo, enokuthi yonakalise i-MOSFET.

Ixesha lokuBuyisa umva: Xa i-diode yomzimba itshintsha ukusuka phambili ukuya kwi-conduction umva, kuthatha ixesha lokubuyisela ukubuyisela amandla ayo okuthintela.

Ukusetyenziswa kwe-MOSFET Body Diodes

I-Freewheeling Diode: Kwimijikelezo ye-inductive, i-diode yomzimba isebenza njenge-freewheeling diode, inika indlela ye-inductor yangoku ukuba ibole xa i-MOSFET icima.

Ukubuyela umva uKhuseleko lwangoku: I-diode yomzimba ikhusela i-MOSFET kumonakalo ngenxa yokuguqulwa kwemisinga enokuthi ivele kwimimiselo ethile yesekethe.

I-Voltage Clamping: Kwezinye iinkqubo, i-diode yomzimba ingasetyenziselwa ukuqinisa amandla ombane, ukunciphisa i-voltage spikes kunye nokukhusela izinto ezibuthathaka.

Imizekelo Eluncedo

Ulawulo lweeMoto ze-DC: Kwiisekethe zolawulo lweemoto ze-DC, i-diode yomzimba ikhusela i-MOSFET kumonakalo obangelwa yi-motor inductive back EMF (i-electromotive force) xa i-MOSFET icima.

IiSekethe zoBonelelo lwaMandla: Kwiisekethe zobonelelo lwamandla, i-diode yomzimba inokusebenza njenge-freewheeling diode, inqanda ukwakhiwa kombane ogqithisileyo xa i-MOSFET icima.

Iisekethe ze-Snubber: Iisekethe ze-Snubber, ezihlala zisebenzisa i-diode yomzimba, zisetyenziselwa ukuchitha amandla kunye nokuthobisa i-voltage spikes ngexesha lokutshintsha kwe-MOSFET, ukukhusela i-MOSFET kunye nokuphucula uzinzo lwesekethe.

Ukuqukumbela

Iidiode zomzimba ze-MOSFET, nangona zihlala zingahoywa, zidlala indima ebalulekileyo kwiisekethe ezahlukeneyo ze-elektroniki. Ukuqonda iziseko zabo, iimpawu, kunye nokusetyenziswa kwazo kuxhobisa iinjineli kunye namagcisa ukuyila iisekethe ezomeleleyo nezithembekileyo. Ngokuqwalasela ngononophelo iimpembelelo ze-body diode kunye nokusebenzisa iindlela ezifanelekileyo zoyilo lweesekethe, amandla apheleleyo e-MOSFET anokufakwa ngelixa kuqinisekiswa ubomi obude kunye nokuzinza kweenkqubo zombane.