When the normal lighting power supply fails, it can effectively illuminate and display the evacuation channel, or can continue to illuminate and work without interruption. It is widely used in public places and places with uninterrupted lighting.
The emergency lighting fixture is composed of light source, light source driver, rectifier, inverter, battery pack, and sign lamp housing. Normally, the 36V drives the light source to normally illuminate through the light source driver, and at the same time, the rectifier is used to supplement the battery pack. Even when the lighting is turned off after get off work, the rectifier still works in the charging state, so that the battery pack is always in a state of full combat readiness. . When an emergency situation occurs, such as an earthquake, fire, or electrical failure caused by a sudden interruption of the power supply, all light sources have stopped working. At this time, it must immediately provide reliable lighting, and indicate the direction of evacuation of people and the location of emergency exits to ensure detention The people in the dark evacuated smoothly. It can be seen that emergency lighting is a kind of light source that maintains lighting and guides evacuation in emergency situations.
When the power supply is normal, J2 is energized and closed, its moving contact is connected with "N/O (normally open point)", and the positive terminal of the backup battery is connected with the reverse terminal of IC1. IC1 (LM308) and D5, D6 form a voltage comparator, and the reference voltage is determined by D5 and D6. Here, a silicon diode (D5) and a 6.2V Zener diode (D6) are used to form a 6.9V reference voltage to monitor the charging voltage. When the input voltage of IC1 pin 2 (ie battery voltage) is lower than 6.9V, IC1 pin 6 outputs high level, T1 is turned on, J1 is energized, and its moving contact is connected to "N/O (normally open point)" When it is switched on, the power supply voltage charges the battery through R2, and LED2 lights up as a charging indication. The charging current can be adjusted by changing the resistance of R2. As the charging time increases, the voltage of IC1's pin 2 gradually increases. When the voltage is greater than the reference voltage of 6.9V, IC1's pin 6 outputs low level, T1 is cut off, J1 loses power, and the charging circuit is disconnected to realize the automatic charging protection function.
When there is a power failure, J2 loses power, its moving contact is connected with "N/C (normally closed point)", and the battery supplies power to the emergency light circuit through S1, realizing the automatic switching function in the event of a power failure. S1 is used here to manually cut off the emergency light circuit part.
GUANGDONG NASITER(INTERNATIONAL) LIGHTING CO.,LTD. is a professional manufacturer of emergency lights, emergency exit sign lights, emergency backup batteries, intelligent emergency evacuation guidance system and other products, most of which are patented products. Our products are complete and professional. Please contact us if you need.