Category: Main page » Auto electronics

Car Battery Charge

Source: http://www.aaroncake.net/

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.

Schematic


This is the schematic of the Car Battery Charger

Parts


Part

Total Qty.

Description

Substitutions

R1

1

500 Ohm 1/4 W Resistor

R2

1

3K 1/4 W Resistor

R3

1

1K 1/4 W Resistor

R4

1

15 Ohm 1/4 W Resistor

R5

1

230 Ohm 1/4 W Resistor

R6

1

15K 1/4 W Resistor

R7

1

0.2 Ohm 10 W Resistor

C1

1

0.1uF 25V Ceramic Capacitor

C2

1

1uF 25V Electrolytic Capacitor

C3

1

1000pF 25V Ceramic Capacitor

D1

1

1N457 Diode

Q1

1

2N2905 PNP Transistor

U1

1

LM350 Regulator

U2

1

LM301A Op Amp

S1

1

Normally Open Push Button Switch

MISC

1

Wire, 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 heatsink 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.


This is the schematic of the Car Battery Charger Power Supply

 

Part

Total Qty.

Description

Substitutions

C1

1

6800uF 25V Electrolytic Capcitor

T1

1

3A 15V Transformer

BR1

1

5A 50V Bridge Rectifier

10A 50V Bridge Rectifier

S1

1

5A SPST Switch

F1

1

4A 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.

 


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