To charge a battery from AC we need a
step down transformer, rectifier, filtering circuit, regulator to
maintain the constant voltage then we can give that voltage to the
battery to charge it. Think if you have only DC voltage and charge the
lead acid battery, we can do it by giving that DC voltage to a DC-DC
voltage regulator and some extra circuitry before giving to the lead
acid battery. Car battery is also a lead acid battery.
As seen in the DC voltage is given to
the DC voltage regulator here we use LM317 which is a DC voltage
regulator. The regulated DC out voltage is given to battery. There is
also a trickle charge mode circuitry which will help to reduce the
current when the battery is fully charged.
Related Post – 12v Portable Battery Charger Circuit using LM317
Components of Lead Acid Battery Charger Circuit:
LM317: LM317 is voltage regulator
invented by Robert C. Dobkin and Robert J. Widlar in 1970.the main
function of this voltage regulator is to regulate the voltage and give
the constant voltage without any noise disturbance; for example if we
have 42v and we want only 10v so to get this output we will give 42v to a
voltage regulator and uninterrupted 10v. For LM317 there is no maximum
voltage unless the difference between the input and output voltage
should not exceed maximum differential voltage. The maximum differential
voltage is around 40V and also it give exceed output current of 1.5A
for 1.2v to 37V .it has three pins input, output and adjustable pin. In
the adjustable we can adjust the difference between the input and output
voltages. Minimum voltage should be 18V which is given as input voltage
to the regulator.
Lead Battery: Lead Battery is a
rechargeable battery in the 1857 by gaston plante. The main advantages
of Lead battery is it will dissipate very little energy (if energy
dissipation is less it can work for long time with high efficiency),it
has very low energy to weight ratio, it can deliver high current’s and
very low cost.
Lead Acid Battery Charger Circuit Diagram:
The circuit diagram can be seen below:
- The DC voltage is connected to the Vin of the LM317 in between we have connected the capacitors will be opened but if it had any AC noise it will remove it.
- The Vout of the LM317 is given to the battery which is to be charged, pin1Adjustment pin of the LM317 is connected to the transistor Q1, Resistor R1, R2, R5 which will help to adjust the regulator.
- The output of regulated voltage and current is controlled by the transistor Q1, resistor R1 and R2 and potentiometer R5.potentiometer which is used to set the charging current. Resistor R2 will have more current when the battery is getting charged. This will help to conduct the transistor Q1. The conduction of Q1 will help to adjust the voltage of LM317.
- TRICKLE CHARGE MODE: in this mode if the battery is charged the reverse current will flow. If the LED has glown then we can say that battery is charged. The diode D2 will protect the LM317 from the reverse current. When the battery is fully charged it will reduce the charge current. If the charge current the transistor will get off so the voltage regulator cannot be adjusted.
NOTE:
- The battery should be charged with 1/10th it’s charging current.so the voltage regulator must generate 1/10th of the charging current produced by the battery
- Heat sink should be attached to the LM317 to the get the better efficiency.
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some simple projects for Electrical&Electronics students