6 volt battery charger circuit diagram pdf

Unregulated DC volts are given to the voltage input pin (Pin 3) of IC 2 and IC 3. Variable voltage regulator is designed using two LM138 IC connected in parallel in order to handle high current. Diode D 3 protects the voltage regulator from reverse voltage. This 12V fixed DC voltage is used to operate the cooling fan and both relay (RL 1 and RL 2). Capacitor C2 connected at output filters the unregulated part if available. Unregulated DC volt is given to voltage input pin (pin 1) of IC1 and a 12V regulated power supply is available at pin voltage output pin (pin 3). The fixed voltage regulator is designed around 12V fixed voltage regulator LM7812. LED 1 indicates the presence of mains supply where resistor R 1 limits the current and dropout the extra voltage. This 15V-0-15V AC is rectified by a full-wave rectifier designed using two diodes (D 1 and D 2) and filtered using one 4700uF electrolytic capacitor (C 1). This circuit is built around a fixed voltage regulator, variable voltage regulator, dual operational amplifier IC, Transistor, Relay, Transformer, and a few other electronic components.Ģ20V AC mains supply is given to primary winding of stepdown center-tap transformer X 1 which lowers the voltage to 15V-0-15V AC. The circuit diagram of the 12V lead-acid battery charger is shown in figure 1. Charge the battery at 14.2V and maintain 13.4V when it is fully charged.Ĭircuit Description of 12V Lead Acid Battery Charger Circuit.(dead battery, healthy battery, charging, full charge). Dedicated LED for indication of different status of the battery.Dedicated LED and alarm for reverse polarity connection of the battery.No output is available at the variable power supply connector when the battery is connected.Automatic detects the battery and charges it with the appropriate voltage.Dedicated variable power supply port up to 18V DC at maximum 5A.Can charge the 12V Lead-Acid battery from 50Ah to 100Ah.Specifications and Advantages of 12V Lead Acid Battery Charger Circuit

6 volt battery charger circuit diagram pdf