He aha ka manaʻo o SELV no nā lako uila?

He aha ka manaʻo o SELV no nā lako uila?

Kū ʻo SELV no ka Voltage Low Extra Safe. Aia i loko o kekahi mau manuale hoʻonoho lako AC-DC i nā ʻōlelo aʻoaʻo e pili ana iā SELV. ʻO kahi laʻana, aia paha he ʻōlelo aʻoaʻo e pili ana i ka hoʻopili ʻana i ʻelua puka i loko o ke kaʻina no ka mea ʻoi aku ka nui o ka uila i ʻoi aku i ka pae palekana SELV i wehewehe ʻia, ʻoi aku ka liʻiliʻi ma mua o ka 60VDC paha. Hoʻohui ʻia, aia paha he mau ʻōlelo aʻoaʻo e pili ana i ka pale ʻana i nā maʻi puka a me nā alakaʻi ʻē aʻe i hiki i ka lako mana me nā uhi e pale iā lākou mai ka hoʻopā ʻia ʻana e nā limahana hana a i hoʻopōkole ʻia paha e kahi mea hana i hoʻokuʻu ʻia, a pēlā aku.

Ke ʻōlelo nei ʻo UL 60950-1 ʻo ke kaʻapuni SELV he "kaapuni lua i hoʻolālā ʻia a pale ʻia ma lalo o nā kūlana maʻamau a me nā hewa hoʻokahi, ʻaʻole ʻoi aku ka nui o nā uila i kahi waiwai palekana." ʻAʻole pili pololei kahi "kaapuni lua" i ka mana mua (AC mains) a loaʻa ka mana ma o ka transformer, converter a i ʻole mea hoʻokaʻawale like. 

ʻO ka hapanui o ka switchmode uila uila AC-DC lako me nā hoʻopuka a hiki i 48VDC e hoʻokō i nā koina SELV. Me kahi puka 48V hiki i ka hoʻonohonoho OVP a i 120% o ka nominal, e ʻae ai i ka hopena i 57.6V ma mua o ka pio ʻana o ka uila. kūlike kēia i ka 60VDC nui loa no ka mana SELV.

Hoʻohui ʻia, loaʻa kahi hopena SELV ma o ka hoʻokaʻawale uila me ka hoʻopili pālua a i ʻole hoʻoikaika ʻia ma waena o ka ʻaoʻao mua a me nā ʻaoʻao lua o nā mea hoʻololi. Eia kekahi, e hālāwai me nā kikoʻī SELV, ka uila ma waena o nā ʻāpana a alakaʻi ʻelua a ʻeʻe a i ʻole ma waena o kahi ʻāpana / alakaʻi alakaʻi a me ka honua e pono ʻole ma mua o kahi waiwai palekana, i wehewehe ʻia e like me ka 42.4 VAC piko a i ʻole 60VDC no ka mea ʻaʻole ʻoi aku ma mua o 200 ms i ka wā maʻamau. hana. Ma lalo o kahi kūlana hewa hoʻokahi, ʻae ʻia kēia mau palena e piʻi i luna i ka 71VAC piko a i ʻole 120VDC no ka mea ʻaʻole ʻoi aku ma mua o 20 ms.

Mai kāhāhā inā ʻike ʻoe i nā kikoʻī uila ʻē aʻe e wehewehe ana i ka SELV ʻokoʻa. ʻO nā wehewehe / wehewehe ma luna aʻe e pili ana iā SELV e like me ka mea i wehewehe ʻia e UL 60950-1 a me nā mea kikoʻī pili e pili ana i nā lako uila uila haʻahaʻa.


Ka manawa Post: Jul-20-2021