SCR Battery Charger Circuit

This circuit can be used to automatically charge a battery through an SCR and cut off when the battery reaches full charge level.

Circuit Explanation

A straightforward battery charger in view of SCR is demonstrated here. Here the SCR amends the AC mains voltage to charge the battery.

In case the battery associated with the charger gets released the battery voltage gets dropped.

This hinders the forward biasing voltage from arriving at the base of the transistor Q1 through R4 and D2.

This switches off the transistor. At the time the transistor is turned OFF, the entryway of SCR (H1) gets the activating voltage by means of R1 & D3.

This makes the SCR to direct and it begins to amend the air conditioner information voltage.

The corrected voltage is given to the battery through the resistor R6(5W).This begins charging of the battery.

At the point when the battery is totally charged the base of Q1 gets the forward inclination motion through the voltage divider circuit made of R3,R4,R5 and D2.

This turns the transistor ON. In case the Q1 is turned ON the trigger voltage at the entryway of SCR is cut off and the SCR is turned OFF.

In this condition a little measure of charge achieves the battery by means of R2 and D4 for stream charging.

Since the charging voltage is just half wave corrected ,this sort of charger is suitable just for moderate charging. For quick charging full wave redressed charging voltage is required.

Notes.

• Gather the circuit on a decent quality PCB or basic board.
• The transformer T1 can be 230V essential, 18V/3A optional venture down transformer.
• The voltage of the battery at which the charging ought to stop can be set by  the POT R4.
• The battery can be associated with the charger circuit by utilizing crocodile cuts.