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由于应急灯的经济、实用，现已成为人们主要选购的小家电产品之一。但目前市场上的应急灯普遍存在以下两个不足：一是充满电后不能自动断电，造成充电变压器初级长时间工作在交流220V状态下产生热损耗，既不安全又耗费电能。二是在应急情况下（晚上突然停电或保险丝熔断）不能
Due to the economical and practical use of emergency lights, it has become one of the most popular small home appliances. However, the current emergency lighting on the market generally the following two deficiencies: First, can not automatically cut off after full charge, resulting in a long time working in the charging transformer AC 220V state heat loss, both safe and consume energy. Second, in an emergency situation (sudden power outage or fuse blown at night) can not