AUTOMATIC BATTERY CHARGER
hello friends today I am gonna telling you about some easy and valuable electronics projects
for school and college practical
Here is a simple , automatic battery charger built around SCR 2P4M (SCR1), transistor BC337(T1),zener diode (ZD1) and a few discrete components.
The power supply circuit for the charger consists of a step-down transformer (X1) and bridge rectifier
comprising diode D1 through D4 . the 50Hz ,230V AC is stepper down by transformer X1 to output 15V, 1A at the secondary.
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| fig ; 1 (diagram ) |
The secondary output is rectified by the full-wave bridge rectifier comprising diodes D1 through D4 and fed to the anode of SCR1. For triggering SCR1, its gate is connected through R1 to the power supply.
Red and black crocodile clips are connected to the cathode of the zener diode and ground, respectively. For charging the battery, connect the red clip to the positive terminal and the black clip to the negative terminal of the battery.
When mains is available, SCR1 gets triggered via R1 and the battery starts charging. When the battery voltage level goes above 12.6V, ZD1 breaks down and NPN transistor T1 becomes forward biased through R2. T1 conducts to ground the gate voltage of SCR1.
SCR1 stops conducting and the battery stops charging. Resistor R3 limits the battery charging current. Its value can be changed as per your requirement.
On the other hand, when the battery voltage goes below 12.6 volts SCR1 gets the required voltage through R1 at its gate and is triggered. The battery starts charging now.
Assemble the circuit on a general- purpose PCB and house in a suitable cabinet. Connect the crocodile clips to the battery terminals, you have to charge. Fig. 2 shows the pin which configurations of SCR 2P4M and transistor BC337. Use a flexible wire for crocodile clips and connect the same to the positive and negative terminal of the battery . 230V ac main is required to operate circuit and charge battery .
Informative
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