A simple battery charger based on SCR is shown here.Here the SCR rectifies the AC
mains voltage to charge the battery.When the battery connected to the charger gets
discharged the battery voltage gets dropped.This inhibits the forward biasing voltage
from reaching the base of the transistor Q1 through R4 and D2.This switches off the
transistor.When the transistor is turned OFF,the gate of SCR (H1) gets the triggering voltage via R1 & D3.This makes the SCR to conduct and it starts to rectify the AC input voltage.The rectified voltage is given to the battery through the resistor R6(5W).This starts charging of the battery…..

Download Battery charger circuit using SCR.Pdf