Sunday, August 21, 2016

24V/7A Lead Acid Battery Charger Circuit using LM317 IC

Electronic Kit School. - There are many lead acid battery widely used in rechargeable electronic devices like in audio sound system that using 12 volt, 7 Ah. As like the character of lead acid battery, that this battery will reduced the voltage after used for many times. This condition make us to recharge this battery with special circuit charger. 

In this article we will give you one electronic circuit design that give you two 12 volt, 7 Ah lead acid battery charger or totally can used to charge 24 volt, 7 Ah lead acid battery with arrange series this two lead acid battery. This circuit based used the semiconductor IC LM317 as the constant voltage adjustable and constant current. Read also: Multi NiCAD Battery Charger Circuit using LM317L.


Figure 1. 24V/7A Lead Acid Battery Charger Circuit using LM317 IC
(Click image to larger)

Component Parts

  1. Transformer 0 - 35V with 5A
  2. Resistors
  3. Transistor Q1 C828
  4. Capacitors
  5. Bridge Diode 3A
  6. Diodes
  7. LM317 IC
  8. LED
  9. Variable resistor

Circuit like in Figure 1 above show you about the 24V/7A Lead Acid Battery Charger using LM317 IC that can charger your 2 Pcs rechargeable lead acid battery with each 12 volt, 7 Ah. In this circuit has 1 LED indicator served as show the charging status and also indicate that the diode D1 work perfect to protect the circuit from damage and LED will be off when the diode fail. 

The input voltage that can be given in this circuit ranging from 220V/50Hz with the Tr1 transformer with output 0 - 35 volt, 5 Ampere.

The circuit above given here is a current restricted the lead acid battery charger built around the reputable variable voltage regulator with using IC LM 317. The value of resistor R2 and here it is set to be 700mA determine the charging current in this circuit. The charging voltage determined by Resistor R3 and RV1. 

Still from the circuit that the job of rectification determined by transformer Tr1 as the steps down the mains voltage and bridge BR1. To refine the ripple after rectification used the C1 served as the filter capacitor. As mentioned above that the diode D1 served as to prevent the reverse flow of current from the battery when charger. When any fail in a charging make the diode will switch OFF.

  • Please use heat sink to reduce the heat from LM317L


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