SELV imayimira Safety Extra Low Voltage. Mabuku ena opangira magetsi a AC-DC amakhala ndi machenjezo okhudza SELV. Mwachitsanzo, pakhoza kukhala chenjezo la kulumikiza zotuluka ziwiri motsatizana chifukwa mphamvu yamagetsi yomwe ikukwera imatha kupitilira gawo lotetezedwa la SELV, lomwe ndi lochepera kapena lofanana ndi 60VDC. Kuphatikiza apo, pakhoza kukhala machenjezo okhudza kuteteza malo otulutsira katundu ndi otsogolera ena omwe angapezeke mu magetsi okhala ndi zokutira kuti asakhudzidwe ndi ogwira ntchito kapena kufupikitsa mwangozi chida choponyedwa, ndi zina zambiri.
UL 60950-1 imanena kuti dera la SELV ndi "gawo lachiwiri lomwe limapangidwa ndikutetezedwa kotero kuti munthawi yabwinobwino komanso kamodzi, zovuta zake sizidutsa pamtengo wabwino." "Dera lachiwiri" sililumikizana mwachindunji ndi magetsi oyambira (ma AC mains) ndipo limapeza mphamvu yake kudzera pa chosinthira, chosinthira kapena chida chodzipatula chofanana.
Mphamvu zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi pt 2 Ndi kutulutsa kwa 48V makonzedwe a OVP atha kukhala mpaka 120% mwadzina, zomwe zingalole kuti zotulukazo zifike ku 57.6V magetsi asanatseke; izi zikadagwirizanabe ndi 60VDC yayikulu yamphamvu ya SELV.
Kuphatikiza apo, kutulutsa kwa SELV kumatheka chifukwa chodzipatula kwamagetsi ndikutchinjiriza kawiri kapena kolimbitsa pakati pa gawo loyamba ndi lachiwiri la ma thiransifoma. Kuphatikiza apo, kuti ikwaniritse zofunikira za SELV, mphamvu yamagetsi yomwe ili pakati pazigawo ziwiri / zotsogola kapena pakati pa gawo limodzi / kondakitala ndi dziko lapansi sayenera kupitirira mtengo wotetezeka, womwe umatchedwa 42.4 VAC pachimake kapena 60VDC osapitilira 200 ms munthawi yanthawi zonse ntchito. Pansi pa vuto limodzi, malirewa amaloledwa kupita pamwamba kufika pa 71VAC pachimake kapena 120VDC osapitilira 20 ms.
Musadabwe mukapeza zina zamagetsi zomwe zimatanthauzira SELV mosiyana. Tsatanetsatane / malongosoledwe pamwambapa akunena za SELV monga momwe tafotokozera ndi UL 60950-1 ndi zina zokhudzana ndi magetsi ochepa.
Post nthawi: Jul-20-2021