Kutheni kusoloko kunzima ukuvavanya ukusetyenziswa kwamandla aphezulu e-MOSFET kunye nokutshintshwa kwe-multimeter?

Malunga namandla aphezulu e-MOSFET ibiyenye yeenjineli ezinomdla wokuxoxa ngesihloko, ke ngoko siye saququzelela ulwazi oluqhelekileyo nolungaqhelekanga.I-MOSFET, ndiyathemba ukunceda iinjineli. Masithethe ngeMOSFET, icandelo elibaluleke kakhulu!

Ukukhuselwa kwe-Anti-static

I-MOSFET enamandla amakhulu yityhubhu yempembelelo yesango eligqunyiweyo, isango alikho isekethe yangoku ngqo, i-impedance yegalelo iphezulu kakhulu, kulula kakhulu ukubangela ukudityaniswa kwentlawulo ye-static, okukhokelela kumbane ophezulu uya kuba lisango kunye nomthombo umaleko wokugquma phakathi kokuqhekeka.

Uninzi lwemveliso yokuqala ye-MOSFETs ayinayo imilinganiselo yokuchasana ne-static, ngoko lumka kakhulu ekugcinweni nasekusetyenzisweni, ngakumbi amandla amancinci e-MOSFETs, ngenxa yamandla amancinane okufakwa kwe-MOSFET amandla amancinci xa kuthelekiswa nombane omileyo uvelisa amandla ombane aphezulu, abangelwa lula kukuqhekeka kwe-electrostatic.

Uphuculo lwakutsha nje lwe-MOSFET yamandla aphezulu ngumahluko omkhulu ngokwentelekiso, okokuqala kuko konke, ngenxa yomsebenzi womthamo omkhulu wegalelo nawo mkhulu, ukuze ukunxibelelana nombane omileyo kunenkqubo yokutshaja, okukhokelela kumbane omncinci, obangela ukophuka. ukuba nokwenzeka kwezinto ezincinci, kwaye ke kwakhona, ngoku i-MOSFET enamandla aphezulu kwisango langaphakathi kunye nomthombo wesango kunye nomthombo womlawuli okhuselweyo we-DZ, i-static efakwe ekukhuseleni Ixabiso lomlawuli we-diode voltage regulator Apha ngezantsi, khusela ngokufanelekileyo isango kunye nomthombo womaleko wokugquma, amandla ahlukeneyo, imifuziselo eyahlukeneyo ye-MOSFET yokukhusela isilawuli sexabiso lolawulo lombane wediode yahlukile.

Nangona imilinganiselo yokukhusela yangaphakathi ye-MOSFET yamandla aphezulu, kufuneka sisebenze ngokuhambelana neenkqubo zokusebenza ezichasene ne-static, ezinokuthi zibe nabasebenzi abaqeqeshiweyo bokulondoloza.

Ukufunyanwa kunye nokutshintshwa

Ekulungisweni koomabonakude kunye nezixhobo zombane, ziya kudibana nomonakalo ohlukeneyo wecandelo,I-MOSFETikwaphakathi kwazo, yindlela abasebenzi bethu bolondolozo abasebenzisa ngayo i-multimeter esetyenziswa ngokuqhelekileyo ukumisela okulungileyo nokubi, okulungileyo nokubi kweMOSFET. Ekuthatheni indawo MOSFET ukuba akukho umenzi ofanayo kunye nemodeli efanayo, indlela yokubuyisela ingxaki.

1, uvavanyo lwe-MOSFET lwamandla aphezulu:

Njengabasebenzi bokulungisa iTV yombane ngokubanzi kumlinganiselo wekristale transistors okanye diode, ngokuqhelekileyo usebenzisa i-multimeter eqhelekileyo ukumisela ii-transistors ezilungileyo nezimbi okanye ii-diode, nangona isigwebo se-transistor okanye i-diode parameters zombane asinakuqinisekiswa, kodwa okoko nje. indlela ichanekile ukuqinisekiswa kwe-crystal transistors "elungileyo" kwaye "embi" okanye "embi" yokuqinisekisa i-crystal transistors. "Kubi" okanye akukho ngxaki. Ngokufanayo, i-MOSFET inokuba njalo

Ukusebenzisa i-multimeter ukumisela "okulungileyo" kunye "okubi" kwayo, ukusuka kulondolozo oluqhelekileyo, kunokuhlangabezana neemfuno.

Ukukhangela kufuneka kusebenzise i-multimeter yodidi lwesalathisi (imitha yedijithali ayifanelekanga ukulinganisa izixhobo ze-semiconductor). Kumandla ohlobo lwe-MOSFET yokutshintsha ityhubhu yi-N-channel yokuphucula, iimveliso zabavelisi phantse zonke zisebenzisa ifom yephakheji ye-TO-220F efanayo (ibhekisa kumbane wokutshintsha amandla we-50-200W yetyhubhu yokutshintsha isiphumo sentsimi) , ilungiselelo le-electrode emithathu nayo iyahambelana, oko kukuthi, ezi zintathu

Izikhonkwane ezantsi, imodeli yoshicilelo ejongene nesiqu sakho, isikhonkwane sasekhohlo sesango, isikhonkwane esifanelekileyo sovavanyo lomthombo, isikhonkwane esiphakathi sombhobho.

(1) i-multimeter kunye namalungiselelo anxulumeneyo:

Okokuqala, ngaphambi kokuba umlinganiselo kufuneka ukwazi ukusebenzisa i-multimeter, ngakumbi ukusetyenziswa kwe-ohm gear, ukuqonda ibhloko ye-ohm iya kuba sisicelo esichanekileyo se-ohm block ukulinganisa i-crystal transistor kwayeI-MOSFET.

Nge-multimeter ohm block ohm isikali sombindi asikwazi ukuba sikhulu kakhulu, kukhethwa ukuba ngaphantsi kwe-12 Ω (itafile yohlobo lwe-500 ye-12 Ω), ukwenzela ukuba kwi-R × 1 ibhloko ingaba nomsinga omkhulu, kwi-PN junction yangaphambili. iimpawu zesigwebo zichaneke ngakumbi. I-Multimeter R × i-10K ibhloko ibhetri yangaphakathi ingcono kakhulu kune-9V, ukwenzela ukuba ekulinganiseni i-PN junction inverse ukuvuza kwangoku ichaneke ngakumbi, ngaphandle koko ukuvuza akunakulinganiswa.

Ngoku ngenxa yenkqubela phambili yenkqubo yokuvelisa, ukuhlolwa kwefektri, uvavanyo lungqongqo kakhulu, ngokuqhelekileyo sigweba nje ukuba isigwebo se-MOSFET singavuzi, asiphuli isiphaluka esifutshane, ukungahambi kwangaphakathi, kunokuba yandisiwe endleleni, indlela ilula kakhulu:

Ukusebenzisa i-multimeter R × 10K ibhloko; I-R × 10K ibhlokhi yebhetri yangaphakathi ngokubanzi yi-9V kunye ne-1.5V ukuya kwi-10.5V le mbane ibonwa njengokwaneleyo ukuvuza kwe-PN ye-junction inversion, ipeni ebomvu ye-multimeter yinto engalunganga (idityaniswe kwi-terminal engafanelekanga yebhetri yangaphakathi), i ipeni elimnyama le-multimeter liyithuba elihle (elidityaniswe kwi-terminal eqinisekileyo yebhetri yangaphakathi).

(2) Inkqubo yovavanyo:

Qhagamshela usiba olubomvu kumthombo we-MOSFET S; qhagamshela ipeni elimnyama kumbhobho we-MOSFET D. Ngeli xesha, isalathisi senaliti kufuneka sibe singenasiphelo. Ukuba kukho isalathisi se-ohmic, esibonisa ukuba ityhubhu ephantsi kovavanyo ine-phenomenon yokuvuza, le tube ayinakusetyenziswa.

Gcina le meko ingentla; ngeli xesha nge-100K ~ 200K i-resistor exhunywe kwisango kunye ne-drain; ngeli xesha inaliti kufuneka ibonise inani le-ohms encinci ngcono, ngokubanzi inokuboniswa kwi-0 ohms, ngeli xesha yintlawulo efanelekileyo nge-100K resistor kwisango le-MOSFET lokutshaja, okukhokelela kumhlaba wombane wesango, ngenxa Indawo yombane eveliswa ngumjelo oqhubayo okhokelela kumanzi kunye nokuhanjiswa komthombo, ngoko ke ukujikwa kwenaliti yemultimeter, i-angle yokuphambuka inkulu (isalathisi sika-Ohm si. encinci) ukubonisa ukuba umsebenzi wokukhupha ulungile.

Kwaye emva koko uqhagamshelwe kwi-resistor isusiwe, ngoko isalathisi se-multimeter kufuneka sibe yi-MOSFET kwisalathisi sihlala singatshintshi. Nangona resistor ukuthatha kude, kodwa ngenxa yokuba resistor kwisango ehlawuliswa intlawulo ayipheli, intsimi yombane isango uyaqhubeka nokugcina umjelo conductive lwangaphakathi isagcinwa, nto leyo iimpawu isango intulated uhlobo MOSFET.

Ukuba resistor ukususa inaliti uya ngokucothayo ngokuthe ngcembe abuyele ukuxhathisa eliphezulu okanye nokuba abuyele infinity, ukuqwalasela ukuba ukuvuza kwesango ityhubhu elilinganisiweyo.

Ngeli xesha ngocingo, oluqhagamshelwe esangweni kunye nomthombo wetyhubhu phantsi kovavanyo, isalathisi se-multimeter ngokukhawuleza sibuyele kwi-infinity. Ukudityaniswa kocingo ukwenzela ukuba i-MOSFET elinganisiweyo, ukukhululwa kwentlawulo yesango, indawo yombane yangaphakathi iyanyamalala; Ijelo eliqhubayo nalo liyanyamalala, ngoko ke idreyini kunye nomthombo phakathi kokuchasana kwaye ibe yinto engenasiphelo.

2, ukutshintshwa kwe-MOSFET yamandla aphezulu

Ekulungisweni kweethelevishini kunye nazo zonke iintlobo zezixhobo zombane, ukudibana nomonakalo wecandelo kufuneka kuthathelwe indawo kunye nohlobo olufanayo lwamacandelo. Nangona kunjalo, ngamanye amaxesha amacandelo afanayo angekho esandleni, kuyimfuneko ukusebenzisa ezinye iintlobo zokutshintshwa, ngoko ke kufuneka sithathele ingqalelo yonke imiba yokusebenza, iiparamitha, imilinganiselo, njl., ezifana nomabonwakude ngaphakathi kwityhubhu yokukhupha umgca, njengoko okoko ukuqwalaselwa kwamandla ombane, okwangoku, amandla anokutshintshwa ngokubanzi (ityhubhu yemveliso yomgca phantse imilinganiselo efanayo yenkangeleko), kwaye amandla athande ukuba mkhulu kwaye abe ngcono.

Ukutshintshwa kwe-MOSFET, nangona nalo mgaqo, kungcono ukulinganisa okona kulungileyo, ngokukodwa, musa ukulandela amandla okuba mkhulu, kuba amandla makhulu; I-input capacitance inkulu, itshintshiwe kwaye iisekethe zokuvuselela azihambelani nokuvuswa kwentlawulo yangoku yokunciphisa isichasi sesekethe yokunkcenkceshela yobungakanani bexabiso lokumelana kunye nomthamo wegalelo weMOSFET unxulumene nokukhethwa kwamandla amakhulu nangona umthamo omkhulu, kodwa igalelo igalelo likhulu, kwaye igalelo capacitance nayo inkulu, kwaye amandla ayikho enkulu.

I-input capacitance nayo inkulu, i-excitation circuit ayilungile, nto leyo eya kwenza ukuba i-MOSFET ivule kwaye ivale ukusebenza kakubi. Ibonisa ukutshintshwa kweemodeli ezahlukeneyo ze-MOSFET, kuthathelwa ingqalelo umthamo wegalelo wale parameter.

Ngokomzekelo, kukho i-42-intshi ye-LCD ye-backlight ye-backlight high-voltage board umonakalo, emva kokujonga umonakalo wangaphakathi wamandla aphezulu we-MOSFET, kuba akukho nombolo yeprototype yokutshintshwa, ukhetho lombane, okwangoku, amandla angaphantsi ukutshintshwa kweMOSFET yoqobo, isiphumo ityhubhu yesibane somva sibonakala sisibane esiqhubekayo (ubunzima bokuqalisa), kwaye ekugqibeleni kufakwe uhlobo olufanayo lweyokuqala ukusombulula ingxaki.

Umonakalo ofunyenweyo kwi-MOSFET yamandla aphezulu, ukutshintshwa kwamacandelo ayo eperipheral esekethe ye-perfusion kufuneka kwakhona kutshintshwe, kuba umonakalo kwi-MOSFET usenokuba ngamacandelwana esekethe ye-perfusion embi okubangwa ngumonakalo we-MOSFET. Nokuba i-MOSFET ngokwayo yonakele, xa i-MOSFET iqhekeka, iinxalenye zesekethe ye-perfusion nazo zonzakele kwaye kufuneka zitshintshwe.

Kanye njengoko sinenkosi eninzi ehlakaniphile yokulungisa ukulungiswa kwe-A3 yokutshintsha umbane; ngokude nje ukuba ityhubhu yokutshintsha ifunyenwe ukuphuka, iphinde ibe phambi kwe-2SC3807 ityhubhu yokuvuselela kunye nokutshintshwa kwesizathu esifanayo (nangona i-tube ye-2SC3807, elinganiswe nge-multimeter ilungile).