Posted by Circuits Arena on Monday, 30 January 2017
Battery Charger Circuit Using SCR Circuit and Applications is the artlcle explaining Battery Charger Circuit The battery is charged with a small amount of AC voltage or DC voltage. So if you want to charge the battery wit...
Battery Charger Circuit
The battery is charged with a small amount of AC voltage or DC voltage. So if you want to charge the battery with the AC power source, then the following steps, we need first of all to limit the large AC voltage to perform, you need to filter the AC voltage to remove the noise, regulate and obtain a DC voltage, and then give the resultant voltage to the battery for charging. After charging scheme should automatically shut down.
Block Diagram of Battery Charger Using SCR:
AC step down transformer which converts high AC in a limited AC source AC voltage filter and remove noise, and then to the voltage on the SCR, where it will straighten AC and allow the resulting voltage across the battery for charging .
Circuit Diagram of Battery Charger Using SCR
Circuit diagram of the Battery Charger Circuit using SCR can be seen below
Circuit Diagram Explanation
The AC main voltage is given to the step down transformer the voltage should be down to 20V approx. the step down voltage is given to the SCR for rectification and SCR rectifies AC main voltage. This rectified voltage is used to charge battery.
When the battery connecter to the charging circuit, the battery will not be dead completely and it will get discharged this will give the forward bias voltage to the transistor through the diode D2 and resistor R7 which will get turned on. When the transistor is turned on the SCR will get off.
When the battery voltage is dropped the forward bias will be decreased and transistor gets turned off. When the transistor is turned off automatically the diode D1 and resistor R3 will get the current to the gate of the SCR, this will triggers the SCR and gets conduct. SCR will rectifies the AC input voltage and give to the battery through Resistor R6.
This will charge the battery when the voltage drop in the battery decreases the forward bias current also gets increased to the transistor when the battery is completely charged the Transistor Q1 will be again turned on and turned off the SCR.
