Using Constant-Voltage Current-Limited Floating-Charge Method Power-Outage Lighting Circuit

Published:2011/5/20 0:05:00 Author:Robert | Keyword: Constant-Voltage, Current-Limiting, Floating-Charge, Power-Outage, Lighting | From:SeekIC

The commercial power would be changed to output 15.1V constant DC voltage through t1's step-down, d1~d4's rectifier, c1's filter and the lm317's regulator. The relay J1 is connected to make the r2, d5 process the current-limited floating charge to the battery. This would make sure the battery in full energy mode anytime. When the commerical power have a outage, j1 would be disconnected and the 12V lead-acid battery begins to supply to the lamps for emergency lighting. The 12V lead-acid battery's floating charging voltage is 14.4V. Because of the diode D5 has been connected in to prevent back discharge, it should adjust the rw1 to make the output voltage of lm317 be 15.1V. This could make sure the battery has enough voltage.



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