Yuav ua li cas tiv thaiv input surge tam sim no nyob rau hauv switching fais fab mov
Feem ntau, thaum lub zog hloov hluav taws xob pib, nws yuav tsim nyog rau daim phiaj hluav taws xob tseem ceeb ntawm qhov kev tawm tswv yim kawg kom muab lub sij hawm luv luv siab tam sim no, uas feem ntau hu ua "input surge currents". Lub input surge tam sim no ua ntej ua teeb meem rau kev xaiv ntawm lub ntsiab Circuit Court breakers thiab lwm yam fuses nyob rau hauv lub main power grid: ntawm ib sab, Circuit Court breakers yuav tsum xyuas kom meej tias lawv fuse thaum lub sij hawm overload los ua lub luag hauj lwm tiv thaiv; Ntawm qhov tod tes, nws yog ib qho tsim nyog yuav tsum tsis txhob fuse thaum lub input surge tam sim no tshwm sim kom tsis txhob ua yuam kev. Qhov thib ob, cov tswv yim surge tam sim no tuaj yeem ua rau cov input voltage waveform vau, ua rau lub zog tsis zoo thiab cuam tshuam rau kev ua haujlwm ntawm lwm yam khoom siv hluav taws xob.
Yog vim li cas rau qhov tshwm sim ntawm input surge tam sim no
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 ib qho loj electrolytic capacitor ua ntej nkag mus rau qhov tseeb DC / DC converter. Lub input surge tam sim no yog generated thaum lub sij hawm pib them ntawm lub electrolytic capacitor, thiab nws qhov loj yog nyob ntawm qhov amplitude ntawm lub input voltage thaum pib thiab tag nrho cov tsis kam ntawm lub Circuit Court 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.
Lub series tsis zoo kub coefficient thermistor ntc yog undoubtedly txoj kev yooj yim tshaj los suppress input surge tam sim no. Vim tias NTC resistors yuav txo qis nrog nce kub. Thaum lub tshuab hluav taws xob hloov pauv tau pib, NTC resistor nyob rau hauv chav tsev kub thiab muaj qhov ua haujlwm siab, uas tuaj yeem txo qhov tam sim no zoo; Tom qab pib lub zog hluav taws xob, NTC resistor yuav kub ceev txog li 110 º C vim nws tus kheej cov cua sov dissipation, thiab tus nqi kuj yuav txo mus txog li ib kaum tsib ntawm qhov kub ntawm chav tsev, txo lub zog poob thaum lub sij hawm ua haujlwm ntawm lub zog switching.
Qhov zoo:
Yooj yim thiab siv tau Circuit Court nrog tus nqi qis
Qhov tsis zoo:
1. Qhov kev txwv tam sim no ntawm NTC resistors cuam tshuam rau ib puag ncig qhov kub thiab txias: yog tias qhov kev tiv thaiv siab dhau lawm thiab cov nqi them tam sim no tsawg dhau thaum lub sijhawm kub qis (qis qis dua) pib, lub zog hloov hluav taws xob yuav tsis tuaj yeem pib; Yog hais tias tus nqi ntawm cov resistor tsawg dhau thaum lub sij hawm kub pib, nws yuav tsis ua tiav cov txiaj ntsig ntawm limiting input surge tam sim no.
2. Qhov kev txwv tam sim no tsuas yog ua tiav ib nrab thaum lub sijhawm cuam tshuam luv luv hauv daim phiaj hluav taws xob loj (txog li ob peb puas milliseconds). Thaum lub sij hawm luv luv no, lub electrolytic capacitor tau raug tso tawm, thaum qhov kub ntawm NTC resistor tseem siab thiab tus nqi kuj me me. Thaum lub hwj huam mov yuav tsum tau rov pib dua tam sim ntawd, NTC tsis tuaj yeem ua tiav qhov kev txwv tam sim no.
3. Lub zog poob ntawm NTC resistors txo qhov kev hloov pauv ntawm kev hloov cov khoom siv fais fab.
Kev xaiv 2
Thaum ua cov khoom siv hluav taws xob qis qis, siv cov hluav taws xob hluav taws xob ncaj qha los txwv cov hluav taws xob hluav taws xob.
Ib qho yooj yim Circuit Court, tsis tshua muaj nqi, thiab yuav luag tsis cuam tshuam los ntawm qhov kub thiab txias nyob rau hauv cov nqe lus ntawm limiting surge tam sim no
Qhov tsis zoo:
Tsuas yog tsim nyog rau cov khoom siv hluav taws xob me me hloov hluav taws xob
● Tseem ceeb cuam tshuam rau kev ua tau zoo
Kev xaiv 3
Lub NTC thermistor txuas nrog rau qhov sib npaug nrog lub zog hluav taws xob zoo tib yam kom txwv tsis pub muaj hluav taws xob tam sim no
Thaum pib ntawm chav tsev kub, qhov kev tiv thaiv tus nqi ntawm lub hwj chim resistor thiab thermistor nyob rau hauv parallel yog siv los txwv cov surge tam sim no. Thaum pib ntawm qhov kub thiab txias, tus nqi kuj ntawm NTC thermistor nce sharply, tab sis tus nqi kuj ntawm lub hwj chim resistor tseem tseem tsis tau hloov, uas tuaj yeem ua kom qhov kub thiab txias pib. Txawm li cas los xij, thaum kev sim ntsuas kub, qhov hluav taws xob hluav taws xob kuj tseem loj.
Qhov zoo:
Yooj yim thiab siv tau, nrog cov txiaj ntsig zoo rau kev pib ntawm chav tsev thiab qhov kub thiab txias
Qhov tsis zoo:
● Tseem ceeb cuam tshuam rau kev ua tau zoo
High kub surge tam sim no
Kev xaiv 4
Ib tug series ruaj resistor yog siv ua ke nrog ib tug thyristor los txwv cov input surge tam sim no. Thaum fais fab tuag, Vs raug txiav tawm, thiab tam sim no hla R1, uas ua raws li cov cuab yeej txwv tam sim no. Thaum qee qhov xwm txheej tau ntsib, VS ua thiab qhib R1 Circuit Court. Lub efficiency poob yog heev txo.
Qhov zoo:
Kev siv hluav taws xob tsawg
Qhov kev txwv ntawm surge tam sim no yuav luag tsis cuam tshuam los ntawm qhov kub thiab txias
Qhov tsis zoo:
Lub ntim loj thiab tus nqi siab
