Automatic Battery Charging Timer

Automatic Battery Charger is designed for lead-acid batteries sealed in 12V. The computer built consists of a circuit, which charges the charging unit. The charging package consists of six battery drivers which can be charged at the same time. The driver circuit, transformer, and power-supply module are provided for each battery. The power supply module is fitted with thermal analyzes and EMI / EMC safety.

Hardware Components

The following components are required to make Automatic Battery Charging Timer Circuit

S.no	Components	Value	Qty
1.	Resistor	1K, 10K ohms	3,1
2.	Potentiometer	10K, 5M ohms	1,1
3.	Transistors	2N4401	2
4.	IC	NE555 Timer	1
5.	Diodes	1N4148, 1N4007	2,4
6.	Relay	12V	2,4
7.	LED	–	1
8.	Battery	12V	1
9.	Capacitors	1000uF, 0.1uF	2,1
10.	Transformer	12V 1A	1

NE555 IC

For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer

Automatic Battery Charging Timer Circuit

Working Explanation

The circuit is divided into two phases. The first stage is a monitoring circuit for battery voltage that will control the battery and start the timer on a preset voltage. With the aid of the 10 K variable resistor, the preset voltage can be picked. The second stage is a timer circuit, designed around a timer IC of 555. For example, change the input DC power supply to 9 V DC or use a 9 V transformer instead of 12V for charging low-voltage batteries, and change the Zener diode to 2,4 or 2,5 volts. Depending on the type of battery the transformer output ampere would be. Slow charging also works well for battery life, Therefore it is easier to charge a 10 AH battery in 5 or 10 hours with a 1 or 2-ampere transformer. But the circuit uses a battery control circuit, which does not let the battery discharge fully until the 10 K variable resistor has been modified.

Application and Uses

• This automatic battery charger use to charge the battery with the help of a timer