Sealed maintaince free battery charger

[nikhilele]

I have SMF(sealed maintanc free battery) rating 12V 7Ah now I want to use this is my ckt in such a way that when there is no ac power then ckt will use battery power and when there is ac power battery will be charged
now my problem is
1> let me know the swtching ckt which i have made is efficient or not.
2> charging method better then this is required or this will do and not reduce the life of battery.
3> is this trickle charing method

 

[vicky]

hi
i think its an sufficient circuit if you want not to make any complication.

 

[nikhilele]

there are many problem with this ckt
1> battery charging will not be fast after discharging in case of multiple power failure.
so we should have two types of charging initially fast charge and after trickle charge.
2> during power failure if battery voltage reaches danger point it should be disconnected from ckt.

 

[IanP]

Simple circuits may not fulfil all your expectations, and 13.8V supply voltage is to low to fully and quickly charge 12V battery ..

In this publication - **broken link removed** , pages 7, 8, .. - you will find examples of over-discharge protection and charging circuits, but, to make them working, you may need to consider higher than 13.8 suplpy voltage ..

Regards,
IanP

 

[nikhilele]

i have changed ckt and posted in new thread cause i want to compare replies for both the ckt.
the title is
"is this battery backup with charging capability ok"