Power Outage Lighting Circuit With Charging Protection

Published:2011/5/2 2:49:00 Author:Robert | Keyword: Power Outage, Lighting, Charging Protection | From:SeekIC

When the power grids have electricity, the comparator U1's + side is referenced voltage 6.9V, if the battery voltage become lower, the u1 would output high voltage level, q1 become conducted, j1 is connected, the battery begin to charging; when the battery voltage rise to the voltage of referenced voltage 6.9V or more, u1 would output low voltage level, which make j1 lost electricity and become disconnected, this achieve auto-charging and protection function. Because of the J2 makes the lamp disconnected, so lamp doesn't light. When the power grids have outage, j1,j2 are all losting electricity and becoming disconnected, so the lamp light.



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