Qhov Ua rau Surge Tam sim no nyob rau hauv Switching Power Supply
Ntawm txhua yam khoom siv hluav taws xob siv yav dhau los thiab tam sim no, kev hloov hluav taws xob yog nrov heev thiab feem ntau tuaj yeem ua tau raws li cov qauv tsim. Hom kev siv fais fab no yog kev lag luam, tab sis kuj muaj qee qhov teeb meem hauv kev tsim qauv. Qhov no yog tias ntau cov khoom siv hluav taws xob hloov hluav taws xob (tshwj xeeb tshaj yog cov khoom siv hluav taws xob hloov hluav taws xob) muaj qhov tsis zoo: lawv kos cov tam sim no loj thaum lub sijhawm hluav taws xob. Qhov surge tam sim no tuaj yeem ncav cuag 1O zaug rau 100 npaug ntawm qhov ua haujlwm zoo li qub ntawm cov khoom siv hluav taws xob. Yog li ntawd, tej zaum yuav muaj tsawg kawg yog ob qhov teeb meem. Yog tias DC fais fab mov tsis tuaj yeem muab qhov pib tam sim no txaus, lub zog hloov pauv tuaj yeem nkag mus rau hauv lub xeev kaw thiab tsis tuaj yeem pib. Qhov hluav taws xob tam sim no tuaj yeem ua rau qhov hluav taws xob ntawm cov khoom siv hluav taws xob txo qis, uas txaus ua rau lwm yam khoom siv hluav taws xob siv tib lub zog hluav taws xob kom poob lub zog tam sim.
Cov txheej txheem input surge tam sim no limiting txoj kev yog series tsis zoo kub coefficient thermistor (NTC). Txawm li cas los xij, txoj kev yooj yim no muaj ntau yam tsis txaus, xws li tam sim no limiting nyhuv ntawm NTC resistor yog heev cuam tshuam los ntawm ambient kub, tam sim no limiting nyhuv tsuas yog ua tiav ib feem thaum lub input fais fab mov yog cuam tshuam rau ib lub sij hawm luv luv (txog ntau pua. milliseconds), thiab lub zog poob ntawm NTC resistor txo qhov kev hloov pauv ntawm kev hloov hluav taws xob. Qhov tseeb, ob qhov teeb meem uas tau hais los saum toj no tuaj yeem daws tau los ntawm "soft start circuit", uas tau qhia hauv kev nthuav dav hauv qab no.
1 switching fais fab mov surge tam sim no ua rau
Lub input circuit ntawm switching fais fab mov feem ntau yog siv capacitor lim rectifier circuit. Nyob rau lub sijhawm thaum lub zog nkag tau raug kaw, vim tias qhov pib qhov hluav taws xob ntawm lub capacitor yog xoom, lub zog loj tam sim no yuav raug tsim nyob rau lub sijhawm thaum lub capacitor raug them. Tshwj xeeb tshaj yog rau high-power switching fais fab mov, lub lim capacitor nrog lub peev xwm loj yog siv los ua kom cov surge tam sim no ncav cuag ntau tshaj 100A A. Xws li ib tug loj surge tam sim no thaum lub hwj huam mov yog qhib yuav feem ntau ua rau cov hluav taws kub. lub input fuse los yog kev sib cuag ntawm lub kaw lus, thiab lub overcurrent ntawm tus choj rectifier yuav puas; Qhov sib dua kuj tseem yuav ua rau lub tshuab cua hloov tsis kaw lub nres. Tag nrho cov xwm txheej saum toj no yuav ua rau cov khoom siv hluav taws xob hloov pauv tsis ua haujlwm ib txwm ua, yog li yuav luag tag nrho cov khoom siv hluav taws xob hloov hluav taws xob tau nruab nrog cov hluav taws xob pib hluav taws xob los tiv thaiv kev cuam tshuam tam sim no, txhawm rau ua kom muaj kev ua haujlwm zoo thiab txhim khu kev qha ntawm ob txhais tes neeg hlau fais fab. muab.
2 hluav taws xob ua hauj lwm hauv paus ntsiab lus ntawm soft start circuit
Yog hais tias "soft start circuit" yog siv los tshem tawm cov surge tam sim no thaum lub switching fais fab mov pib, lub shortcomings ntawm cov saum toj no tsoos surge tam sim no limiting txoj kev yuav zam tau zoo. Kev tswj qhov pib ntawm kev hloov hluav taws xob los ntawm "soft start" kom tshem tawm cov surge tam sim no suav nrog ob lub hauv paus ntsiab lus: tshem tawm cov khoom thauj thaum lub sijhawm fais fab tuag thiab txwv tsis pub muaj txiaj ntsig tam sim no tib lub sijhawm. Yog hais tias lub load tsis tau tsav, lub switching fais fab mov feem ntau muaj ib tug me me tam sim no thaum nws pib. Hauv ntau qhov xwm txheej, qhov pib tam sim no yuav tsawg dua li qhov ua haujlwm tsis tu ncua tam sim no khaws cia los ntawm txoj kev no.
