Yuav ua li cas los tiv thaiv Input Surge Tam sim no nyob rau hauv Switching Fais Fab Khoom
Feem ntau, thaum pib lub zog hloov hluav taws xob, daim phiaj tseem ceeb ntawm qhov kev tawm tswv yim kawg yuav tsum tau muab lub sijhawm luv luv ntawm cov mem tes loj, uas feem ntau hu ua "inrush tam sim no". Lub input surge tam sim no ua ntej teeb meem rau kev xaiv ntawm lub ntsiab Circuit Court breaker (lub ntsiab Circuit Court breaker) thiab lwm yam fuses nyob rau hauv lub ntsiab daim phiaj: ntawm ib sab, lub Circuit Court breaker yuav tsum xyuas kom meej tias nws yuav fuse thaum overloaded los ua lub luag hauj lwm tiv thaiv; ntawm qhov tod tes, nws yuav tsum yog nyob rau hauv cov tswv yim Thaum lub surge tam sim no tshwm sim, nws yuav tsum tsis txhob fused kom tsis txhob malfunction. Qhov thib ob, cov kev tawm tswv yim surge tam sim no yuav ua rau cov input voltage waveform tawg, uas yuav ua rau lub zog tsis zoo thiab cuam tshuam rau kev ua haujlwm ntawm lwm yam khoom siv hluav taws xob.
Ua rau Input Inrush Current
Hauv kev hloov hluav taws xob, cov khoom siv hluav taws xob yog thawj zaug lim los ntawm kev cuam tshuam, tom qab ntawd hloov mus rau DC los ntawm tus choj rectifier, thiab tom qab ntawd smoothed los ntawm lub tshuab hluav taws xob loj ua ntej nkag mus rau DC / DC converter tiag. Lub input surge tam sim no yog generated thaum lub electrolytic capacitor pib them, thiab nws qhov loj nyob ntawm qhov loj ntawm qhov input voltage thaum pib thiab tag nrho cov tsis kam ntawm lub voj uas tsim los ntawm tus choj rectifier thiab electrolytic capacitor. Yog hais tias nws tshwm sim pib ntawm lub ncov point ntawm AC input voltage, lub ncov input surge tam sim no yuav tshwm sim.
Option Ib
Cov txheej txheem ntau tshaj plaws ntawm cov tswv yim inrush tam sim no limiting: series tsis zoo kub coefficient thermistor tam sim no limiting resistor (ntc)
Series NTC txwv lub hwj chim-on inrush tam sim no
Series tsis zoo kub coefficient thermistor tam sim no limiting resistor ntc yog undoubtedly los ntawm deb ntawm qhov yooj yim txoj kev los suppress input surge tam sim no. Vim ntc resistors degrade nrog nce kub. Thaum lub zog hloov hluav taws xob pib, ntc resistor nyob ntawm qhov kub thiab txias thiab muaj qhov ua haujlwm siab, uas tuaj yeem txo qhov tam sim no zoo; Tom qab pib lub zog hluav taws xob, lub ntc resistor yuav sai sai kub txog li 110ºC vim nws cov cua sov dissipation, thiab tus nqi kuj yuav txo mus rau chav sov li ntawm ib-15th ntawm lub sij hawm, txo lub hwj chim poob thaum lub switching fais fab mov. ua haujlwm li qub.
Qhov zoo: yooj yim thiab cov tswv yim Circuit Court, tus nqi qis
tsis txaus:
1. Qhov kev txwv tam sim no ntawm ntc resistor cuam tshuam zoo heev los ntawm qhov kub thiab txias: yog tias qhov kev tiv thaiv loj dhau thiab qhov them tam sim no tsawg dhau thaum pib ntawm qhov kub qis (subzero), lub zog hloov hluav taws xob yuav tsis tuaj yeem pib. ; Yog tias nws pib ntawm qhov kub siab, qhov kev tiv thaiv tus nqi ntawm cov resistor Yog tias nws tsawg dhau, qhov cuam tshuam ntawm kev txwv cov input inrush tam sim no yuav tsis ua tiav.
2. Qhov kev txwv tam sim no tsuas yog ua tiav ib nrab thaum lub sij hawm luv luv input mains cuam tshuam (ntawm qhov kev txiav txim ntawm ntau pua milliseconds). Thaum lub sij hawm luv luv no, lub electrolytic capacitor tau tso tawm, tab sis qhov kub thiab txias ntawm ntc resistor tseem siab thiab nws kuj yog me me. Thaum lub hwj huam mov yuav tsum tau rov pib dua tam sim ntawd, ntc tsis tuaj yeem paub txog qhov kev txwv tam sim no.
3. Lub zog poob ntawm ntc resistor txo qhov kev hloov pauv ntawm lub zog hloov pauv.
Option II
Thaum ua lub micro-power switching fais fab mov, ncaj qha siv lub hwj chim resistor los txwv cov inrush tam sim no.
Qhov zoo: yooj yim Circuit Court, tsis tshua muaj nqi, yuav luag tsis cuam tshuam los ntawm qhov kub thiab txias nyob rau hauv cov nqe lus ntawm inrush tam sim no txwv
Qhov tsis zoo: tsuas yog tsim nyog rau cov khoom siv hluav taws xob hloov hluav taws xob, uas muaj kev cuam tshuam zoo rau kev ua haujlwm, thiab ncaj qha txuas hluav taws xob resistors hauv series kom txwv tsis pub muaj hluav taws xob tam sim no (tsuas yog tsim rau micro-power switching fais fab mov)
