12 V Battery Charger Circuit Diagram

Other Engineering Diciplines
Post Reply
User avatar
Neo
Site Admin
Site Admin
Posts: 2642
Joined: Wed Jul 15, 2009 2:07 am
Location: Colombo

12 V Battery Charger Circuit Diagram

Post by Neo » Thu Feb 25, 2010 7:19 pm

This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.
charger.gif
charger.gif (6.29 KiB) Viewed 12817 times
PartTotal Qty.Description
R11500 Ohm 1/4 W Resistor
R213K 1/4 W Resistor
R311K 1/4 W Resistor
R4115 Ohm 1/4 W Resistor
R51230 Ohm 1/4 W Resistor
R6115K 1/4 W Resistor
R710.2 Ohm 10 W Resistor
C110.1uF 25V Ceramic Capacitor
C211uF 25V Electrolytic Capacitor
C311000pF 25V Ceramic Capacitor
D111N457 Diode
Q112N2905 PNP Transistor
U11LM350 Regulator
U21LM301A Op Amp
S11Normally Open Push Button Switch
MISC1Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output
Notes
  1. The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these.
  2. A heat sink will be needed for U1.
  3. To use the circuit, hook it up to a power supply/plug it in. Then, connect the battery to be charged to the output terminals. All you have to do now is push S1 (the "Start" switch), and wait for the circuit to finish.
  4. If you want to use the charger without having to provide an external power supply, use the following circuit.
    power.gif
    power.gif (1.04 KiB) Viewed 12817 times
    PartTotal Qty.DescriptionSubstitutions
    C116800uF 25V Electrolytic Capacitor
    T113A 15V Transformer
    BR115A 50V Bridge Rectifier10A 50V Bridge Rectifier
    S115A SPST Switch
    F114A 250V Fuse
  5. The first time you use the circuit, you should check up on it every once and a while to make sure that it is working properly and the battery is not being over charged.
User avatar
Saman
Lieutenant Colonel
Lieutenant Colonel
Posts: 828
Joined: Fri Jul 31, 2009 10:32 pm
Location: Mount Lavinia

Re: 12 V Battery Charger Circuit Diagram

Post by Saman » Thu Feb 25, 2010 7:38 pm

This is a nice switch mode battery charger circuit based on 2 MAXIM ICs.
AN86.pdf
(35.17 KiB) Downloaded 1627 times
User avatar
Herath
Major
Major
Posts: 417
Joined: Thu Aug 05, 2010 7:09 pm

Re: 12 V Battery Charger Circuit Diagram

Post by Herath » Mon Aug 09, 2010 3:07 pm

I have LM317 regulator and LM339N in my UPS charging circuitry. Will I be able to use that charger for using the UPS with a car battery?. Instead of by passing.
User avatar
Neo
Site Admin
Site Admin
Posts: 2642
Joined: Wed Jul 15, 2009 2:07 am
Location: Colombo

Re: 12 V Battery Charger Circuit Diagram

Post by Neo » Mon Aug 09, 2010 4:00 pm

I'm sure you will with some adjustments. LM338 is the most commonly used car battery charger. You may download the datasheet for the said components and see whether what needs to be changed to suit a car battery. Generally, I think you can fix a car battery which will take long time to charge with present circuitry.
Post Reply

Return to “Other”