Yiziphi izimo zokufaka izicelo zama-MOSFET?

Ama-MOSFET asetshenziswa kakhulu kumasekethe e-analog nedijithali futhi ahlobene eduze nempilo yethu.Izinzuzo zama-MOSFET yilezi: i-drive circuit ilula uma kuqhathaniswa.Ama-MOSFET adinga ukushayela okuncane kakhulu kwamanje kune-BJTs, futhi ngokuvamile angashayelwa ngokuqondile yi-CMOS noma umqoqi ovulekile. Izifunda zomshayeli we-TTL. Okwesibili, ama-MOSFET ashintsha ngokushesha futhi angasebenza ngesivinini esiphezulu ngoba awukho umphumela wokushaja wokugcina. Ngaphezu kwalokho, ama-MOSFET awanayo indlela yesibili yokuhluleka ukuphuka. Ukuphakama kwezinga lokushisa, ngokuvamile kunamandla okukhuthazela, aphansi amathuba okuwohloka kokushisa, kodwa futhi ebangeni lokushisa elibanzi ukuze kunikeze ukusebenza okungcono.Ama-MOSFET asetshenziswe enanini elikhulu lezicelo, kuma-electronics abathengi, imikhiqizo yezimboni, i-electromechanical. imishini, amafoni ahlakaniphile neminye imikhiqizo ye-elekthronikhi ephathekayo ingatholakala yonke indawo.

Ukuhlaziywa kwecala lesicelo se-MOSFET

1, Ukushintsha izinhlelo zokusebenza zokunikezwa kwamandla

Ngokwencazelo, lolu hlelo lokusebenza ludinga ukuthi ama-MOSFET aqhube futhi avale ngezikhathi ezithile. Ngasikhathi sinye, kunenqwaba yama-topology angasetshenziselwa ukushintshwa kwamandla kagesi, njengamandla kagesi e-DC-DC avame ukusetshenziswa kusiguquli sebhaka eliyisisekelo sincike kuma-MOSFET amabili ukwenza umsebenzi wokushintsha, lezi zinguquko zishintshana ku-inductor ukuze zigcinwe. amandla, bese uvula amandla umthwalo. Njengamanje, abaklami bavame ukukhetha amaza kumakhulu we-kHz nangaphezulu kwe-1MHz, ngenxa yokuthi ukuphakama kwemvamisa, kuncane futhi kube lula kwezakhi kazibuthe. Imingcele yesibili ebaluleke kakhulu ye-MOSFET ekushintsheni amandla kagesi ihlanganisa amandla okukhiphayo, i-threshold voltage, i-gate impedance namandla e-avalanche.

2, izinhlelo zokusebenza zokulawula izimoto

Izinhlelo zokusebenza zokulawula izimoto zingenye indawo yesicelo samandlaAma-MOSFET. Amasekhethi avamile okulawula ibhuloho elinguhhafu asebenzisa ama-MOSFET amabili (ibhuloho eligcwele lisebenzisa amane), kodwa ama-MOSFET amabili angasebenzi (isikhathi sokufa) ayalingana. Kulolu hlelo lokusebenza, isikhathi sokubuyisela emuva (trr) sibaluleke kakhulu. Lapho ulawula umthwalo wokungenisa inductive (njengokusonga kwenjini), isifunda sokulawula sishintsha i-MOSFET kusekethe yebhuloho iye endaweni evaliwe, ngaleso sikhathi enye iswishi kusekethe yebhuloho ihlehlisa okwesikhashana i-diode yomzimba ku-MOSFET. Ngakho-ke, i-current ijikeleza futhi futhi iyaqhubeka inika amandla injini. Uma i-MOSFET yokuqala iphinda iqhuba, inkokhiso egcinwe kwenye idiode ye-MOSFET kufanele isuswe futhi ikhishwe nge-MOSFET yokuqala. Lokhu ukulahlekelwa kwamandla, ngakho-ke uma i-trr iba mfushane, ukulahlekelwa kuncane.

3, izicelo zezimoto

Ukusetshenziswa kwamandla e-MOSFETs ezinhlelweni zezimoto kukhule ngokushesha eminyakeni engama-20 edlule. AmandlaI-MOSFETikhethiwe ngenxa yokuthi ingakwazi ukumelana nezenzakalo ze-voltage eziphezulu zesikhashana ezibangelwa amasistimu e-elekthronikhi ezimoto ezivamile, njengokucisha umthwalo kanye nezinguquko ezisheshayo kumandla wesistimu, futhi iphakheji layo lilula, ikakhulukazi lisebenzisa amaphakheji we-TO220 kanye ne-TO247. Ngesikhathi esifanayo, izinhlelo zokusebenza ezinjengamafasitela kagesi, umjovo kaphethiloli, ama-wiper ahamba kancane, nokulawula ukuhamba kancane kancane kuya ngokuya kuba yizinga ezimotweni eziningi, futhi imishini yamandla efanayo iyadingeka ekwakhiweni. Ngalesi sikhathi, amandla ezimoto ama-MOSFET avela njengama-motor, ama-solenoid, nama-injection kaphethiloli athandwa kakhulu.

Ama-MOSFET asetshenziswa kumishini yezimoto amboza inhlobonhlobo yama-voltage, ama-currents, kanye nokumelana nokumelana. Ukulungiselelwa kwebhuloho lamadivayisi okulawula izimoto kusetshenziswa amamodeli wamandla kagesi wokuwohloka okungu-30V no-40V, amadivayisi angu-60V asetshenziselwa ukushayela imithwalo lapho izimo zokuqalisa ukulayisha kungazelelwe kufanele zilawulwe, futhi ubuchwepheshe be-75V buyadingeka lapho izinga lemboni lishintshelwa kumasistimu ebhethri angu-42V. Amadivayisi kagesi asizayo aphezulu adinga ukusetshenziswa kwamamodeli angu-100V kuya ku-150V, kanti amadivaysi e-MOSFET angaphezu kuka-400V asetshenziswa kumayunithi omshayeli wenjini namasekhethi okulawula amalambu aphumayo aphezulu (HID).

Izimoto zamadrayivu e-MOSFET zisukela ku-2A ziye phezu kuka-100A, ngokumelana okusuka ku-2mΩ kuye ku-100mΩ. Imithwalo ye-MOSFET ihlanganisa amamotho, ama-valve, amalambu, izinto zokufudumeza, ama-capacitive piezoelectric assemblies kanye nezinto zikagesi ze-DC/DC. Amafrikhwensi okushintsha ngokuvamile asukela ku-10kHz kuye ku-100kHz, nge-caveat yokuthi isilawuli semoto asifanele ukushintsha amaza angaphezu kuka-20kHz. Ezinye izidingo eziyinhloko ukusebenza kwe-UIS, izimo zokusebenza endaweni yokushisa okulinganiselwe (-40 degrees kuya ku-175 degrees, ngezinye izikhathi kuze kufike ku-200 degrees) nokuthembeka okuphezulu ngaphezu kwempilo yemoto.

4, amalambu e-LED nomshayeli wezibani

Ekwakhiweni kwezibani ze-LED nezibani ngokuvamile zisebenzisa i-MOSFET, kumshayeli wamanje we-LED, ngokuvamile zisebenzisa i-NMOS. amandla MOSFET kanye bipolar transistor ngokuvamile ezahlukene. Isango lalo likhulu ngokuqhathaniswa. I-capacitor idinga ukushajwa ngaphambi kokwenziwa. Lapho i-voltage ye-capacitor idlula i-threshold voltage, i-MOSFET iqala ukuqhuba. Ngakho-ke, kubalulekile ukuqaphela ngesikhathi sokuklama ukuthi umthamo womthwalo womshayeli wesango udinga ukuba mkhulu ngokwanele ukuze kuqinisekiswe ukuthi ukushajwa kwe-capacitance yesango elilinganayo (CEI) kuqedwa phakathi nesikhathi esidingwa uhlelo.

Ijubane lokushintsha le-MOSFET lincike kakhulu ekushajweni nasekukhipheni amandla okufaka. Nakuba umsebenzisi engakwazi ukunciphisa inani le-Cin, kodwa anganciphisa inani lomthombo wesignali yesango lokushayela iluphu yomthombo wangaphakathi wokumelana nama-Rs, ngaleyo ndlela anciphise ukushaja kwe-loop yesango kanye nokukhipha izikhathi ezingaguquki, ukusheshisa isivinini sokushintsha, ikhono elijwayelekile le-IC drive ngokuyinhloko kubonakala lapha, sithi ukukhethaI-MOSFETibhekisela kuma-IC amanje edrayivu e-MOSFET angaphandle. ama-MOSFET IC akhelwe ngaphakathi awadingi ukucatshangelwa. Ngokuvamile, i-MOSFET yangaphandle izocatshangelwa ama-currents angaphezu kwe-1A. Ukuze uthole amandla e-LED amakhulu futhi aguquguqukayo, i-MOSFET yangaphandle iyona ndlela kuphela yokukhetha i-IC idinga ukuqhutshwa amandla afanelekile, futhi amandla okufaka we-MOSFET yipharamitha eyinhloko.