http://circuit-diagramz.com Keeping your car battery constantly charged when the car is not in use appreciably increases the life of the battery.

1. Automatic Battery Charger Circuit
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2. Diagram | Circuit Diagramz
FEBRUARY 26, 2017 IBRAHEEM AUTOMOTIVE CIRCUIT DIAGRAMS, BATTERY CARGER, HOME
AUTOMATION CIRCUIT DIAGRAMS
Keeping your car battery constantly charged when the car is not in use
appreciably increases the life of the battery. Charging is, of course, normally
possible in your garage. The charger described here provides a constant charging
current that may, for example, be fed to the battery via the cigarette lighter.
Automatic battery charger circuit detail:
The charger consists of a mains transformer, Tr1, bridge rectifier B1and
smoothing capacitor C1. The charging current through the regulator, IC1 and the
switched series resistors is 107 mA (47Ω); 230 mA (22 Ω); 500 mA (10 Ω) or 1A (5
Ω).
Diodes D1D4 indicate the position of the switch. Transistor T1, resistor R1 and
diode D5 ensure the brightness of the diodes. When the battery is not connected
the relay is not energized and the mains is switched off.
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3. When the battery is connected C3 is get charged, T4 is switched ON and the relay
is energized. The mains is then switched ON and the battery is charged via D7.
The consequent voltage drop across D7 causes T3 and T2 to be switched ON, so
that the relay remains energized although, since its collector is at +12V,
transistor T4 is switched off. Resistor R5 ensures thatC1 is kept charged so that
T4 remains off.
To ensure that the charger works with flat batteries, the relay contact may be
bypassed by S1 which enables the charger to switches ON manually.
Note that during constant charging of lead acid batteries there is the risk that
water dissolves into hydrogen and oxygen and this will reduce the liquid in the
battery. Since sealed batteries cannot be topped up, the present charger is not
suitable for this type of battery.
Also do not use a current higher than necessary; in most cases 100 mA is ample.
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4. « Circuit Diagram of Low-Voltage Power Inverter AC-DC
The larger currents are intended for charging large NiCd batteries.
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