The red light (D2 LED) indicates the battery is charging and the green light (D1 LED) indicates that the battery has fully charged. The LED D1 and D2 indicate the status, whether the battery is charging or not. And if it reaches a value equal to the threshold, the circuit automatically cut OFF the supply from the battery. The circuit charges the battery as far as it has a voltage below the threshold limit. The circuit controls the charging of the battery by taking feedback of the voltage across the battery terminals. Here the circuit for a 6V automatic battery charger circuit with overcharge protection, LED charging indicator and current limiting feature. Transformer – T1- 230V/6V,1A Automatic battery charger with LED indicator and Overcharge protection circuit Thus, by replacing the resistance R2 and R3 with a potentiometer we can always adjust the output voltage and current of the circuit.īut, while using the circuit with other batteries, the charging rate and other parameters should be considered. The charging voltage and current depends on the value of resistance R2 and R3 respectively. But the output voltage and current limit of the circuit can be varied to use with other batteries. This circuit is designed for charging 6V 4.5AH lead acid batteries. So it will reduce the resistance across R2 and thereby the value of V out. When the current flow through the sensing resistor R3 increases, the base current of the Q1 also increases. The output voltage of the circuit varies from 1.25V to 6.125 V. The input voltage to the battery will be adjusted itself, with respect to the charging current. Current limiting arrangement regulates the output voltage of the LM317 to limit the current flow above a fixed value. But, the circuit is already designed with an additional overcurrent protection. The LM317 has a maximum operating current of 1.5 Amperes, with an internal current limiting and thermal overload protection.
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