Tshem tawm ntawm input overvoltage nyob rau hauv switching fais fab mov
Feem ntau, thaum pib lub zog hloov hluav taws xob, 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 tam sim no". Lub input surge tam sim no ua ntej ua teeb meem nyob rau hauv 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 yaj thaum lub sij hawm overload los muab kev tiv thaiv; Ntawm qhov tod tes, nws yog ib qho tsim nyog kom tsis txhob yaj thaum muaj kev tawm tswv yim surge tam sim no kom tsis txhob ua haujlwm tsis raug. Qhov thib ob, qhov input surge tam sim no yuav ua rau cov input voltage waveform vau, ua rau lub zog tsis zoo ntawm cov khoom siv hluav taws xob thiab tom qab ntawd 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 thaum kawg smoothed los ntawm lub 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 no electrolytic capacitor, thiab nws qhov loj nyob ntawm qhov amplitude ntawm input voltage thaum pib thiab tag nrho cov tsis kam ntawm 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 txuas nrog qhov tsis zoo kub coefficient thermistor tam sim no txwv cov resistor NTC yog undoubtedly txoj kev yooj yim tshaj los suppress input surge tam sim no. Vim tias NTC resistors txo 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 lub hwj chim tau pib, NTC resistor yuav sai sai kub txog li 110 º C vim nws cov cua kub 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 ib txwm ua hauj lwm ntawm lub switching fais fab mov.
