Hello Guys,
This is going to be my 1st post on this thread. I am doing my best to follow the rules of thread, but if I miss at any place, I would be glad to take that into notice.
My question looks rather simple.
-For my uC work, I am using a battery(12v, 1.7AH) to power uC.
-Battery is being charged by a ready-charger of 12v, 2A.
Just to get idea of simple connection, +/- of charger goes to +/- of battery and that only goes to regulator (7805) of circuit.
-Arrangement is such that if mains power fails, battery will keep circuit alive for a few hours.
-Normal output of charger is around 12.7v and battery withstands (and also requires) that voltage.
With a battery fully charged with that voltage , my circuit lasts around 4hrs.
-Now, I want my circuit to check if power has failed or not so it can run some routine.
-If I connect +/- directly to charger, and if mains fails, it will still get 12v from battery.
So to get away with it, I connected a diode in + line from charger to battery.
-While this thing is working well, charging voltages now are 11.7v only and with that battery last only for ~1/2 to 1 hour.
-Using schottky diode will definitely reduce the drop but would still remain in range of 0.4v.
Any better idea to implement this?