Circuit Schematic Automatic 12V Lead-Acid Battery Charger

BatteryCharger. - This is electronic Circuit Schematic Automatic 12V Lead-Acid Battery Charger like in Figure 1 below. In this circuit schematic the basic component used are transistors. 

In here we will give you global description about Circuit Schematic Automatic 12V Lead-Acid Battery Charger and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Component Part
  • PC1 3 volt solar cell from a sidewalk solar light
  • C1 22 uF, 10 volt (values not critical)
  • C2 100 pF, any voltage or type, typically ceramic
  • C3 10 uF, 16 volt or more for higher voltage battery
  • R1 1.5 k, any type
  • R2 3.9k, any type
  • R3 10k, any type
  • R4 180 ohm, any type
  • R5 4.7k, any type
  • R6 10 ohm PTC (see text).
  • L1 50 to 300 uH (see text)
  • D1 1N5818 schottky rectifier, just about any will do.
  • Q1 2N4403, or similar
  • Q2 2N4401, or similar
  • J1 output jack
  • B1 6 volt NiCad battery w/fuse

Circuit schematic like in Figure 1 above is Circuit Schematic Automatic 12V Lead-Acid Battery Charger. Techlib site describe that this little gadget uses a small 3 volt solar cell to charge a 6 volt NiCad battery pack which, in turn, may be used to charge many models of cell phones and other portable devices with the addition of a suitable low-dropout voltage regulator. The circuit "scavenges" energy from the solar cell by keeping it loaded near 1.5 volts (maximum energy transfer value) and trickle charges the internal battery pack with current pulses. The simple circuit isn't the most efficient possible but it manages a respectable 70% at 100 mA from the cell and 30% when the cell is providing only 25 mA which is actually pretty good without going to a lot more trouble or using more exotic components.

Note: This circuit is intended for using a low voltage cell to charge a higher voltage battery. Don't use it to charge a battery at the same or lower voltage than the cells generate. The circuit needs a battery load to work properly. Make sure to use a NiCAD battery as they are tolerant of overcharging. Leave the unit in a sunny place and the battery should stay good for years - mine is still going strong since the original article.

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