【正文】 y long time, high brightness with automatic emergency poweroff function. Emergency evacuation lights has small power consumption, high brightness, long service life, the edge of the design of the power switch and lights that were suitable for factories, hotels, schools, units and other public places to prepare for power outages for emergency lighting purposes. Fire evacuation indicator is the choice of industrial plastic and highbrightness light bulb made of material does not age, fast heat dissipation, impact resistance and other characteristics. Emergency evacuation lights with a wallmounted, portable, hanging installation. Users install the evacuation light, you can choose according to the actual situation of different installation methods. Emergency lighting batteries are used in fire emergency light battery, when the AC input to charge the battery using the charging circuit, the normal AC power is disconnected electricity off our normal circumstances, fire emergency lighting lamps battery to power the light bulb. Now the state fire emergency light power supply emergency lighting batteries required time shall not be less than 90 minutes. Fire emergency light batteries are mainly used to provide power to fire emergency lighting is a major fire emergency lighting installations, emergency lighting and fire with fire when used in normal lighting system can not provide illumination for the evacuation, the special status continued to work fire fighting and rescue operations and emergency lighting. Key words: Fire emergency lights, principles, circuits, fault analysis 哈爾濱應用職業(yè)技術學院畢業(yè)設計（論文） 目 錄 摘 要 ................................................................. I Abstract .............................................................. II 第 1章 緒 論 .......................................................... 1 課題描述 ....................................................... 1 基本工作原理及框圖 ............................................. 1 第 2章 相關芯片及硬件電路設計 .......................................... 2 應急照明燈電路 ................................................. 2 應急照明電路圖 ............................................ 2 元器件選擇 ................................................ 2 自動充電電路 ................................................... 3 自動充電電路原理 .......................................... 3 圖 3 自動充電電路電路圖 .......................................... 3 繼電器開關 ..................................................... 3 多諧振蕩電路 ................................................... 4 555 的功能特性 .....................................