SELV sawv kev Nyab Xeeb Kev Nyab Xeeb Tsawg Qis Tshaj Tawm. Qee phau AC-DC hluav taws xob muab cov phau ntawv teeb tsa muaj lus ceeb toom txog SELV. Piv txwv li, tej zaum yuav muaj lus ceeb toom txog kev sib txuas ntawm ob qhov tawm nyob rau hauv koob vim tias qhov hluav taws xob ntau dua yuav dhau qhov tau hais tseg SELV qib kev nyab xeeb, uas yog tsawg dua lossis sib npaug rau 60VDC. Tsis tas li ntawd, tej zaum yuav muaj lus ceeb toom txog kev tiv thaiv cov khoom tawm thiab lwm yam kev nkag mus hauv cov hluav taws xob nrog lub hau npog kom tiv thaiv lawv los ntawm kov cov neeg ua haujlwm lossis ua yuam kev luv luv los ntawm cov cuab yeej poob, thiab lwm yam.
UL 60950-1 hais tias SELV Circuit Court yog "Circuit Court lwm qhov uas yog li tsim thiab tiv thaiv tias nyob rau hauv ib qho kev txhaum thiab ib qho txhaum, nws cov voltages tsis tshaj li tus nqi nyab xeeb." Ib qho "Circuit Court txuas" tsis muaj qhov sib txuas ncaj qha rau thawj lub zog (AC mains) thiab coj lub zog los ntawm lub hloov hluav taws xob, hloov hluav taws xob lossis sib txig sib luag.
Feem ntau switchmode tsis tshua muaj hluav taws xob AC-DC khoom siv hluav taws xob nrog cov txiaj ntsig mus txog 48VDC tau raws li SELV cov cai. Nrog 48V cov zis tso tawm OVP teeb tsa tau nce mus txog 120% ntawm cov nominal, uas yuav tso cai rau cov zis mus txog 57.6V ua ntej lub zog muab hluav taws xob kaw; qhov no tseem yuav yoog mus rau qhov siab tshaj 60VDC rau SELV fais fab.
Ib qho ntxiv, SELV tso tawm tau tiav los ntawm hluav taws xob sib cais nrog ob npaug los yog txhawb cov rwb thaiv tsev ntawm cov thawj thiab theem nrab sab ntawm cov hloov pauv. Ntxiv mus, kom tau raws li SELV cov kev qhia tshwj xeeb, qhov ntsuas hluav taws xob ntawm ob qhov chaw nkag mus / tus neeg xyuas pib lossis nruab nrab ntawm ib qho chaw nkag mus / tus neeg xyuas pib thiab lub ntiaj teb yuav tsum tsis pub dhau tus nqi nyab xeeb, uas tau txhais raws li 42.4 VAC ncov lossis 60VDC rau tsis pub ntev tshaj 200 ms thaum lub sijhawm lag luam. Nyob hauv ib qho txhaum xwb, cov kev txwv no raug tso cai mus rau ntau dua mus rau 71VAC qhov siab tshaj lossis 120VDC tsis ntev tshaj 20 ms.
Tsis txhob poob siab yog tias koj pom lwm qhov kev ntsuas hluav taws xob uas txhais tau SELV txawv. Cov lus txhais / cov lus piav qhia saum toj no yog hais txog SELV raws li txhais los ntawm UL 60950-1 thiab lwm yam kev cuam tshuam txog cov khoom siv hluav taws xob tsawg.
Lub sij hawm tshaj tawm: Jul-20-2021