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Production of rechargeable emergency bulkhead light

Dec 22,2022

Simple and practical production of rechargeable emergency bulkhead light. The rechargeable emergency bulkhead light can automatically switch the power supply in the event of a power outage. When the power supply is normal, the backup battery is automatically charged and has a charging protection function. The working principle is described below.

When making a rechargeable emergency bulkhead light, when the power supply is normal, J2 is energized and closed, its moving contact is connected to "N/O (normally open point)", and the positive end of the backup battery is connected to the inverting end of IC1. IC1 (LM308) and D5, D6 form a voltage comparator, and the reference voltage is determined by D5 and D6.
When making the rechargeable emergency bulkhead light, 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 pin 2 of IC1 (that is, the battery voltage) is lower than 6.9V, pin 6 of IC1 outputs a high level, T1 is turned on, J1 is energized, and its moving contact is connected to "N/O (normally open point)" Connected, the power supply voltage charges the battery through R2, and LED2 lights up as a charging indication.
When making rechargeable emergency bulkhead light, change the resistance value of R2 to adjust the charging current. As the charging time increases, the voltage of pin 2 of IC1 increases gradually. When the voltage is greater than the reference voltage of 6.9V, pin 6 of IC1 outputs a low level, T1 is turned off, J1 loses power, and the charging circuit is disconnected to realize the automatic charging protection function.
Through the above introduction and analysis of the Production of rechargeable emergency bulkhead light, hope it helps you.