Simple 5v Battery Backup Circuit
Intro: Simple 5v Battery Backup Circuit
It’s a simple 5v battery backup circuit with constant slow charging facility. Its mostly suitable for microcontroller projects where we need constant current source without any cut-out. Whenever mains fails the battery takes the load without any delay again when mains restores batter goes to charging mode again. Its not just a idea or diagram I developed this circuit for my own (my digital clock need’s constant 5v power supply) and still using this, till now without any problem. Make the circuit and if you face any difficulties just give me a call
16 Comments
ShakirS 8 years ago
what is the use of 680 ohm and IN4007 doide in series with the voltage regulator?
NickolasT3 4 years ago
EngrDanny 10 years ago
victordas 10 years ago
You can use almost any kind of battery under the voltage rating. It may AA battery x 3 = 4.5 or lead acid 5v battery. almost any kind
Hammerhead46 9 years ago
How do you get 5 volts out of a lead acid battery?
They are 2.2 volts PER CELL!
Also to get 5 Volts out you need to ADD 0,7 VOLTS to the 5 VOLT battery for the drop over the diode!
So that would call for a 5.7 VOLT battery, NO SUCH THING!
LesB41 4 years ago
victordas 9 years ago
Don know about you sir but my design and "also" my circuits just works
fine with me and also still working ,if you can make it better than plz
do your best.And One more thing i like to remind you these designs are ONLY
basic idea Circuits (DIY) ""NOT FOR COMMERCIAL USE"". So in that case
little much miscalculation is acceptable. Have a Good Day
JimS186 8 years ago
Looks like you need 6v battery to accommodate the 1V drop across the 1N4007 diode.
Kenjutsu 9 years ago
Thank you for your circuit. What must I change so that the battery is not charged at all when mains is restored?
Masnur 9 years ago
victordas 9 years ago
It says 680r "r" thats mean "680 ohms" NOT K its R.......if want to use 6v than u have to change all the setup. its designed for 5v NOT 6V. the LED its just a indicator nothing else. and its a simple nd easy circuit just a basic battery backup circuit it will NOT control the battery charge or OVER charge.
lacortez 9 years ago
Nice...
What is the maximum load that can be attached to the 5V.
Regards
victordas 9 years ago
Max safe volt. 4.7-5v (personal experience)
lacortez 9 years ago
Thanks,
Couple of more questions, what is the maximum current the circuit can provide.
Also, can the circuit be upgraded to check when battery is fully charged, so that it does not damage it.
I am looking to use it to power my Raspberry Pi.
Regards
turbiny 9 years ago
victordas 9 years ago
Actually its NOT ment for that kind of job its a Battery-Backup Circuit
its Not a charging circuit. you can search the Net you will surely get
something for I-phone @ turbiny