The set up makes it possible to make an simple 12V battery charger of excellent level of quality through which you are able to recharge batteries of 1 2 Volts for car, and dry batteries employed in the systems of alarms.
Its functioning seemingly automatic considering that, whenever it's plugged into a battery, it will eventually only function if the battery is discharged, and it is going to automatically remove when the battery is fully charged.
The unit is driven by a transformer whose secondary is usually 14-15 Volts having a current of 3 Amperes minimum.
The trimmer TR1 is tweaked to ensure that at the output of the battery charger there exists a voltage of about 14.4 volts without load.
The absolute maximum distributable current is 3 Amperes, so DO NOT make an effort to recharge batteries with a capacity higher than 36Ah. Best utilization of this device would be to power a battery charger for alarm system with battery in standby mode.
In the course of installation, attention should be taken to hook up the battery with the proper polarity.
For the construction of the components, cautiously stick to the configuration of the diagram.
Printed circuit, AUTOMATIC BATTERY CHARGER INPUT 14-15 VOLTS at a charging CURRENT of MAX 3 AMPERES
Parts List for the 12V automatic car battery charger circuit:
All resistors are
Of 1/4 watt unless otherwise specified.
Rl-470 Ohms
R2 = 10 K
R3 = 270 Ohms
TR1 = 10 K trimmer.
Cl = 1000uF25V.
DZ1 = 5.1 volts lWzener.
T1 = 2N2218
T2 = 2N3055-BDW21C
1C1 = UA741
PT1 = KBL04 / 01
1 Socket 8 pins.
1 Heat sink for Tl.
1 Heat sink for T2.
Simple 12V Battery Charger with Battery Indicator
This is a simple 12V battery charger circuit with indicator circuit is a smart charger circuit. You are able to ideally take advantage of this circuit for applications such as inverters, portable chargers, etc. This design additionally includes a twin indication system in the form of a battery charging indicator, and a low battery buzzer indicator. The benefit of this indicator is that a buzzer notifies you once the battery has to be recharged. This circuit design undoubtedly aids for your daily life battery charging purposes.
How the simple battery charger circuit works
- The charging circuit is created around voltage regulator IC 7815 and a couple of BC transistors 547 BJTs.
- The main 230V or 110V input could be the first steped down through a step-down transformer, after that it may be rectified and filtered.
- This DC voltage is then delivered to the voltage regulator IC 7815 ;. The output gets regulated at 15V
for charging the connected 12 volt rechargeable battery at the output of the voltage regulator. And it begins charging the battery as soon as the main power is available.
- Any time battery voltage falls under a particular value LED1 ceases to glow and the buzzer begins sounding indicating that the battery is discharged and requires recharging.
Bill of Material
-transformer (230V to 15V or 110V T0 15V)
-pont rectifier (1N4007 x 4)
-condenser (470UF, 50V)
- IC 7815 Voltage Regulator
-12V rechargeable battery