Kungani kuhlala kunzima ukuhlola ukusetshenziswa kwamandla aphezulu kwe-MOSFET nokushintshwa nge-multimeter?

Mayelana namandla aphezulu i-MOSFET bekungomunye wonjiniyela abazimisele ukuxoxa ngesihloko, ngakho-ke sihlele ulwazi olujwayelekile nolujwayelekile lweI-MOSFET, ngithemba ukusiza onjiniyela. Ake sikhulume nge-MOSFET, ingxenye ebaluleke kakhulu!

Ukuvikelwa kwe-Anti-static

I-MOSFET enamandla amakhulu iyishubhu yomphumela wesango elivalekile, isango alikho isifunda esiqondile samanje, i-impedance yokufaka iphezulu kakhulu, kulula kakhulu ukubangela ukuhlangana kwe-static charge, okuholela ekutheni i-voltage ephezulu izoba yisango kanye nomthombo ungqimba lwe-insulating phakathi kokuqhekeka.

Iningi lokukhiqizwa kokuqala kwama-MOSFET alinazo izinyathelo zokulwa ne-static, ngakho-ke qaphela kakhulu ekugcinweni nasekusetshenzisweni, ikakhulukazi ama-MOSFET amandla amancane, ngenxa yamandla amancane okufakwayo kwe-MOSFET mancane uma kuqhathaniswa, lapho evezwe kugesi omile kukhiqiza i-voltage ephezulu, ebangelwa kalula ukuwohloka kwe-electrostatic.

Ukuthuthukiswa kwakamuva kwe-MOSFET enamandla amakhulu umehluko omkhulu uma kuqhathaniswa, okokuqala, ngenxa yomsebenzi we-capacitance enkulu yokufaka nayo inkulu, ukuze ukuthintana nogesi omile kube nenqubo yokushaja, okuholela ku-voltage encane, okubangela ukuphuka. okungenzeka kube khona ezincane, bese futhi, manje i-MOSFET enamandla amakhulu esangweni langaphakathi kanye nomthombo wesango kanye nomthombo wesilawuli esivikelwe i-DZ, i-static efakwe ekuvikelweni kwe- isilawuli se-voltage ye-diode value Ngezansi, vikela ngempumelelo isango kanye nomthombo wesendlalelo se-insulating, amandla ahlukene, amamodeli ahlukene e-MOSFET yokuvikela isilawuli senani lokulawula i-voltage ye-diode ahlukile.

Nakuba izinyathelo zokuvikela zangaphakathi ze-MOSFET ezinamandla aphezulu, kufanele sisebenze ngokuhambisana nezinqubo zokusebenza ezilwa nokuqina, okuyizisebenzi zokunakekela eziqeqeshiwe okufanele zibe nazo.

Ukutholwa nokushintshwa

Ekulungiseni amathelevishini kanye nemishini kagesi, izohlangana nomonakalo ohlukahlukene wengxenye,I-MOSFETiphinde ibe phakathi kwazo, okuyindlela abasebenzi bethu abalungisa ngayo ukusebenzisa i-multimeter evame ukusetshenziswa ukucacisa okuhle nokubi, okuhle nokubi kwe-MOSFET. Esikhundleni se-MOSFET uma kungekho mkhiqizi ofanayo kanye nemodeli efanayo, indlela yokushintsha inkinga.

1, ukuhlolwa kwe-MOSFET enamandla amakhulu:

Njengabasebenzi abavamile abalungisa i-TV kagesi esilinganisweni sama-crystal transistors noma ama-diode, ngokuvamile basebenzisa i-multimeter evamile ukuze banqume ama-transistors amahle noma amabi noma ama-diode, nakuba ukwahlulela kwe-transistor noma imingcele kagesi ye-diode kungenakuqinisekiswa, kodwa inqobo nje uma indlela ilungile ukuze kuqinisekiswe i-crystal transistors "enhle" futhi "embi" noma "embi" ukuze kuqinisekiswe ama-crystal transistors. "Kubi" noma akunankinga. Ngokufanayo, i-MOSFET nayo ingaba

Ukusebenzisa i-multimeter ukucacisa "okuhle" kanye "okubi" kwayo, kusukela ekugcinweni okujwayelekile, kungahlangabezana nezidingo.

Ukutholwa kufanele kusebenzise uhlobo lwe-pointer multimeter (imitha yedijithali ayifanele ukukala amadivayisi we-semiconductor). Ohlotsheni lwamandla amashubhu okushintsha i-MOSFET athuthukisa i-N-channel, imikhiqizo yabakhiqizi cishe yonke isebenzisa ifomu lephakheji elifanayo le-TO-220F (ibhekisela ekushintsheni kwamandla okuphakela amandla angu-50-200W weshubhu yokushintsha umphumela wensimu) , ukuhlelwa kwama-electrode amathathu nakho kuyavumelana, okungukuthi, amathathu

Phina phansi, imodeli yokuphrinta ibheke yona uqobo, iphinikhodi yesokunxele yesango, iphinikhodi yokuhlola elungile yomthombo, iphinikhodi ephakathi nendawo yokukhipha amanzi.

(1) i-multimeter kanye namalungiselelo ahlobene:

Okokuqala, ngaphambi kokuba ukulinganisa kufanele kukwazi ukusebenzisa i-multimeter, ikakhulukazi ukusetshenziswa kwegiya le-ohm, ukuqonda ukuthi i-ohm block izoba ukusetshenziswa okufanele kwe-ohm block ukukala i-crystal transistor futhiI-MOSFET.

Nge-multimeter ohm block ohm center isikali asikwazi ukuba sikhulu kakhulu, okungcono sibe ngaphansi kuka-12 Ω (ithebula lohlobo lwama-500 lika-12 Ω), ukuze kubhulokhi engu-R × 1 ibe namandla amanje amakhulu, ekuhlanganeni kwe-PN kowangaphambili. izici zokwahlulela zinembe kakhulu. I-Multimeter R × 10K block ibhethri langaphakathi likhulu kakhulu kune-9V, ukuze ekulinganiseni i-PN junction inverse ukuvuza kwamanje kunembe kakhudlwana, ngaphandle kwalokho ukuvuza akukwazi ukulinganiswa.

Manje ngenxa yenqubekelaphambili yenqubo yokukhiqiza, ukuhlolwa kwefekthri, ukuhlolwa kuqinile kakhulu, sivame ukwahlulela inqobo nje uma isahlulelo se-MOSFET singavuzi, singaphuli isifunda esifushane, ukungajikelezi kwangaphakathi, kungaba ikhuliswe endleleni, indlela ilula kakhulu:

Ukusebenzisa i-multimeter R × 10K block; Ibhethri yangaphakathi ye-R × 10K block imvamisa ingu-9V kanye no-1.5V kuya ku-10.5V le voltage ngokuvamile ibhekwa njengokuvuza kwe-PN junction inversion eyanele, ipeni elibomvu le-multimeter liyikhono elingalungile (lixhunywe kutheminali engalungile yebhethri yangaphakathi), i ipeni elimnyama le-multimeter linamandla amahle (lixhunywe ku-terminal eqondile yebhethri yangaphakathi).

(2) Inqubo yokuhlola:

Xhuma ipeni elibomvu emthonjeni we-MOSFET S; xhuma ipeni elimnyama ku-drain ye-MOSFET D. Ngalesi sikhathi, inkomba yenaliti kufanele ibe infinity. Uma kukhona inkomba ye-ohmic, ebonisa ukuthi ithubhu elingaphansi kokuhlolwa linesimo sokuvuza, le tube ayikwazi ukusetshenziswa.

Gcina isimo esingenhla; ngalesi sikhathi nge-resistor engu-100K ~ 200K exhunywe esangweni nokukhipha amanzi; ngalesi sikhathi inaliti kufanele ikhombise inani lama-ohms elincanyana kangcono, ngokuvamile lingakhonjiswa ku-0 ohms, kulokhu kuyinkokhelo enhle nge-resistor engu-100K ekushajweni kwesango le-MOSFET, okuphumela esikhaleni sikagesi sesango, ngenxa inkambu kagesi ekhiqizwe ishaneli yokuhambisa okuholela ekudonselweni kwamanzi kanye nomthombo, ngakho-ke ukuphambuka kwenaliti ye-multimeter, i-deflection angle inkulu (inkomba ye-Ohm small) ukufakazela ukuthi ukusebenza kokukhishwa kuhle.

Bese ixhunywe ku-resistor isusiwe, khona-ke i-pointer ye-multimeter kufanele ibe yi-MOSFET kunkomba ihlala ingashintshiwe. Nakuba resistor ukuthatha kude, kodwa ngenxa yokuthi resistor esangweni icala icala alipheli, isango insimu kagesi uyaqhubeka nokugcina channel conductive yangaphakathi namanje inakekelwa, okuyinto izici isango ngci uhlobo MOSFET.

Uma resistor ukuthatha inaliti ngeke kancane kancane futhi kancane kancane abuyele ukumelana high noma ngisho abuyele infinity, ukucabangela ukuthi ukuvuza kwesango tube kukalwa.

Ngalesi sikhathi ngocingo, oluxhunywe esangweni kanye nomthombo wethubhu ngaphansi kokuhlolwa, i-pointer ye-multimeter ibuyele ngokushesha ekungapheli. Ukuxhumeka kocingo ukuze i-MOSFET elinganisiwe, ukukhululwa kokushaja kwesango, insimu yangaphakathi kagesi iyanyamalala; I-conductive channel nayo iyanyamalala, ngakho-ke ukudonsa nomthombo phakathi kokumelana futhi kube okungapheli.

2, ukushintshwa kwe-MOSFET enamandla amakhulu

Ekulungiseni amathelevishini nazo zonke izinhlobo zemishini kagesi, ukuhlangana nokulimala kwengxenye kufanele kushintshwe uhlobo olufanayo lwezingxenye. Kodwa-ke, ngezinye izikhathi izingxenye ezifanayo azikho esandleni, kuyadingeka ukusebenzisa ezinye izinhlobo zokushintshwa, ukuze sicabangele zonke izici zokusebenza, imingcele, ubukhulu, njll., njengethelevishini ngaphakathi kwe-tube yokukhipha umugqa, njengoba inqobo nje uma ukucatshangelwa kwe-voltage, yamanje, amandla ngokuvamile angashintshwa (ithubhu yokukhipha umugqa cishe ubukhulu obufanayo bokubukeka), futhi amandla avame ukuba makhulu futhi abe ngcono.

Ngokushintshwa kwe-MOSFET, nakuba futhi lesi simiso, kungcono kakhulu ukulinganisa okungcono kakhulu, ikakhulukazi, ungaphishekeli amandla okuba mkhulu, ngoba amandla makhulu; i-input capacitance inkulu, ishintshiwe futhi amasekethe avusa amadlingozi awahambisani nesasasa le-charge current limiting resistor yesekethe yokunisela yesayizi yenani lokumelana kanye namandla okufakwayo e-MOSFET ahlobene nokukhethwa kwamandla amakhulu naphezu komthamo wokufaka we-MOSFET. umthamo omkhulu, kodwa amandla okufaka nawo makhulu, futhi amandla okufaka nawo makhulu, futhi amandla awamakhulu.

Amandla okokufaka nawo makhulu, isekethe yenjabulo ayilungile, okuzokwenza ukuthi i-MOSFET ivuleke futhi ivale ukusebenza kube kubi kakhulu. Ibonisa ukushintshwa kwamamodeli ahlukene we-MOSFET, kucatshangelwa amandla okokufaka ale pharamitha.

Isibonelo, kunomonakalo webhodi we-42-intshi we-LCD TV we-backlight high-voltage, ngemva kokuhlola umonakalo wangaphakathi wamandla aphezulu we-MOSFET, ngoba ayikho inombolo ye-prototype yokushintshwa, ukukhethwa kwe-voltage, yamanje, amandla awekho ngaphansi ukushintshwa kwe-MOSFET kwasekuqaleni, umphumela uba ishubhu le-backlight libonakala lilokoza njalo (ubunzima bokuqalisa), futhi ekugcineni lithathelwe indawo uhlobo olufanayo lwasekuqaleni ukuxazulula inkinga.

Umonakalo otholiwe ku-MOSFET enamandla amakhulu, ukushintshwa kwezingxenye zayo ze-peripheral of perfusion circuit kumele futhi kushintshwe, ngoba umonakalo we-MOSFET ungase futhi ube izingxenye ezimbi zesekethe ye-perfusion edalwe ukulimala kwe-MOSFET. Ngisho noma i-MOSFET ngokwayo ilimele, lapho i-MOSFET iphuka, izingxenye zesekethe ye-perfusion nazo ziyalinyazwa futhi kufanele zishintshwe.

Njengoba nje sinezingcweti eziningi zokulungisa ezihlakaniphile ekulungiseni ugesi oshintshwayo we-A3; inqobo nje uma ishubhu elishintshayo litholakala ukuthi liyaphuka, liphinde libe ngaphambili kweshubhu ye-excitation engu-2SC3807 kanye nokushintshwa kwesizathu esifanayo (nakuba ishubhu le-2SC3807, elilinganiswa nge-multimeter lihle).