Wednesday, October 1, 2014

Lead Acid Battery Charger Based on IC LM 317 Circuit Schematic

Eltronicschool. - Do you need electronic circuit schematic for Lead Acid Battery Charger that can automatically reduce the output current when the battery has fully charge? In here we will show you the circuit schematic that can do this work like in figure 1 below. This circuit schematic we get from CircuitsToday blog. Beside we will show you the schematic and the component list, we also will show you the description that came from the original source.

Circuit Schematic

Figure 1. Circuit of Lead Acid Battery Charger Based on IC LM 317 (Circuitstoday)

Component List
  1. C1 = 1000uF/40V
  2. C2 = 0.22uF
  3. C3 = 0.22uF
  4. R1 = 0.5 Ohm / 5W
  5. R2 = 470
  6. R3 = 120
  7. R4 = 100
  8. R5 = 1K (Variable)
  9. IC1 = LM 317
  10. Q1 = BC 548


Circuit schematic like in figure 1 above is Lead Acid Battery Charger Based on IC LM 317. According the description from the circuitstoday show us that The IC here provides the correct charging voltage for the battery.A battery must be charged with 1/10 its Ah value.This charging circuit is designed based on this fact.The charging current for the battery is controlled by Q1 ,R1,R4 and R5. 

Potentiometer R5 can be used to set the charging current.As the battery gets charged the the current through R1 increases .This changes the conduction of Q1.Since collector of Q1 is connected to adjust pin of IC LM 317 the voltage at the output of of LM 317 increases.When battery is fully charged charger circuit reduces the charging current and this mode is called trickle charging mode.

For more information about the work of IC LM317, you must read the datasheet of this IC that you can search from search engine.

Source : Circuitsoday

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