Hi everybody,
Now I am here with a Automatic Battery Charger circuit
having overcharge protection feature. In one of my previous post, we were
discussed about a battery charger circuit. For that, the battery gets
continously charged, and this overcharging affects the performance of the
battery seriously. Today I am with a solution for that, as usual the circuit is
simple to wire up, it consists only a few components and you can make this at
your home itself. This circuit eliminates the battery draining due to
overcharge, because the charger turnoff after the charging is made completed.
COMPONENTS REQUIRED
Transformer
|
9V,500mA
|
1
|
Diodes
|
1N4007
|
5
|
IC
|
LM317
|
1
|
Transistor
|
BC548
|
1
|
Zener Diode
|
6.2V, 0.5W
|
1
|
Resistors
|
2.2K (Variable)
|
1
|
1K
|
1
|
|
180
|
1
|
|
4.7
|
1
|
|
1.2K
|
1
|
|
Capacitors
|
1000uF, 25V
|
1
|
Battery
|
6V, 4.5Ah
|
1
|
LED
|
1
|
CIRCUIT DIAGRAM
WORKING PRINCIPLE
The circuit is powered by 230V, 50Hz A.C supply. The high
voltage supply is stepdowned using a suitable transformer to 9V and this
alternating voltage is fed to a rectifier followed by a filter. The rectification
is made possible using four diodes (1N4007), by employing the switching action
of diodes. The elimination of ripples is done using a high valued capacitor. After
rectification and filtering process we get a direct current, which is further
stabilized using a voltage regulator IC LM317. The output from regulator is
used to charge the 6V battery.
Once the
battery is completely charged (ie; Voltage across the battery is 6V) the zener
diode gets in forward biased and it starts conduction, this gives a positive
voltage to the base terminal of BC548(NPN Transistor) which in turn makes it
ON.
This ceases the charging of battery, because the output from
IC is directly connected to the ground or negative potential through the
forward biased transistor
Hi,
ReplyDeleteThank you very much for this Great Circuit Diagram. I like this one very much and want to make this circuit. I already Brought almost all parts but I cant understand how do I connect The IC "LM317" (Actually I didn't fund this IC instead of this I bought "LM317T" will this work properly?) and The Transistor
BC548. Actually I am new in Electronics, Please help me build this circuit.
Actually I need specific instruction on how to connect the IC and the Transistor, Which pin connect where...?
I am really awaiting for your response, I already have parts, after getting suggestions I will connect the parts with a Perfboard.
Thank you in advanced.
Regards,
MD
I am glad that you like this circuit. I will definitely help you on making this one. LM317T and LM317 are same, which is a Linear technology based voltage regulator IC. The pin diagram of the IC is also shown above. Click on the circuit diagram to open it.
DeleteIf you have anymore doubts, comment it below :)
HI,
ReplyDeleteThank you for your very valuable information. Finally I built this circuit and everything is working perfectly but unfortunately the (Circuit) output voltage is avg 5 volt (its show 6 volt for few second i every minute).
I think we need 7.0 - 7.5 volt to charge the battery fully in a certified way,,,
Please help me fix this error/issue.
See the below image for more understanding:
http://s17.postimg.org/hp0swksr3/2013_07_15_04_51_03.jpg
For any reference the voltage info below:
You know the output current is 5 volt or 5.5 volt at the same time my main face voltage was 250 volt and the transformer (which power the circuit) voltage was around 7.5 or 8.
I am awaiting to hear from you.
Any help will be much appreciated.
Thank you
I Think Your stepdown transformer delivers an output voltage of only about 7V and this voltage is further reduced by the drop in rectifier diodes and voltage regulator IC. Thats why you get an output of 5V.
DeleteHi,
ReplyDeleteThank you,
Can you please give me a way to fix this... You know I need 7 volt on output. I not only made this circuit but also bought 3 battery which is not cheap. So, please tell me how do I fix this problem to get 7 volt and desire AMP on output. and also please how much amp shout there on the output to get battery charged correctly ?
I need your help immediately otherwise my money/battery's will be damaged without charge...
I made the circuit using the same parts mention on your diagram and please tell me what I have to do now.
Thank you very much
HI,
ReplyDeleteI connected about 18 volt (.6 AMP) on to power the circuit but No luck... I seen the same 5 volt but as usual blinks to 6 volt some times.
please tell me which parts to change to fix this/ to get desired 7.5 volt ??
I am awaiting for your news.
Thank you in advanced
This circuit is designed for charging 6V
Deletebattery, for that 7V is enough. Does the
output voltage rises while adjusting 2.2K
pot.
Give me your Mail ID, we will contact you...
ReplyDeleteThank you,
ReplyDeleteThe voltage is not rising while adjusting 2.2k pot. but its possible to low down the voltage by adjusting the pot.
chockhong1@gmail.com
is my mail. I will be very happy if you help me.
-
MD
Thanks for the tutorial...Are you using 1/2 resistor and the 4.7 resistor is it 4.7k
ReplyDeletei have also the same doubt the 4.7 resistor is 4.7k ...
ReplyDeleteHi sir, i got a question to ask. This circuit is used to charge 6V battery only?
ReplyDeleteCan it be use to charge different voltage capacity battery with the exact same configuration? Or there must be some modification done?
Thanks a lot for helping.
Hi sir. I got some question to ask. Can i know that this circuit can only be used to charged and protect 6V battery? Can it be used on other capacity of battery lesser than 6V with the exact configuration? Or is there some changes need to be made to the circuit? Im charging 3V battery.
ReplyDeleteHope to receive your answer. Thanks a lot.
Hai can you tell me what modifications I should make to get it work on 12 v 7.5 ah battery
ReplyDeleteHi, is it possible to use 9 volt 1 amp AC/DC adapter instead of 9volt 500ma transformer and bridge rectifier.. If yes, what modifications would be required
ReplyDeletewhere to add battery full indication led
ReplyDeletewhere to add battery full indication led
ReplyDeletehi dear! hope u will be fine,,
ReplyDeleteactually i am a student of electrical engineering deptt i m given a project which will be based on powersupply is this a suitable project for me??
sir,pls send your mail id it will be more help full for us
ReplyDeletethat's a nice ckt from you sir,but I have small doubt when the battery charged full then the charging gets seased and what correction need for circuit to make automatic on when the battery discharged
ReplyDelete