應急(ji)照明燈(deng)是在正常照明電源發生故障時，能有效(xiao)地照明和(he)顯(xian)示疏散通道，或能持續照明而不(bu)間斷(duan)工(gong)作的(de)一(yi)類(lei)燈(deng)具。廣泛用于公共場所和(he)不(bu)能間斷(duan)照明的(de)地方。

       應急(ji)照明燈(deng)具由(you)光(guang)源(yuan)(yuan)、光(guang)源(yuan)(yuan)驅(qu)(qu)動(dong)(dong)(dong)器(qi)、整流(liu)器(qi)、逆變器(qi)、電(dian)(dian)池組、標志燈(deng)殼等幾(ji)部分(fen)組成(cheng)。平時(shi)，市(shi)電(dian)(dian)220V通過光(guang)源(yuan)(yuan)驅(qu)(qu)動(dong)(dong)(dong)器(qi)，驅(qu)(qu)動(dong)(dong)(dong)光(guang)源(yuan)(yuan)正常照明，同時(shi)通過整流(liu)器(qi)對(dui)電(dian)(dian)池組進(jin)行電(dian)(dian)能補充，即使在下班后關斷照明的情況下，整流(liu)器(qi)仍(reng)然(ran)工(gong)作在充電(dian)(dian)狀態，以便使電(dian)(dian)池組始終(zhong)處于(yu)飽滿的戰備狀態。當遇到(dao)緊急(ji)情況，市(shi)電(dian)(dian)突然(ran)停止時(shi)，逆變器(qi)將(jiang)自(zi)動(dong)(dong)(dong)啟動(dong)(dong)(dong)逆變電(dian)(dian)路，把電(dian)(dian)池組的低壓(ya)(ya)電(dian)(dian)能轉換為高壓(ya)(ya)電(dian)(dian)能，驅(qu)(qu)動(dong)(dong)(dong)光(guang)源(yuan)(yuan)繼續照明。