Simple NiCd Battery Charger Circuit

In this tutorial, we are demonstrating NiCd Battery Charger Circuit. The NiCd Battery Charger can charge a 12V NiCd battery pack. However, you can likewise charge 6V and 9V battery packs.

When you give the input capacity to the NiCd Battery Charger Circuit, you will get the ideal output for various battery packs. This circuit is using a transformer that can convey a 4A current somewhere in the range of 12V to 16V. Standard chargers select the charging voltage through a switch yet the circuit highlighted here utilizations a programmed current regulator.

The circuit fabricates by using a combination of four NPN transistors to amplify the current as per the desired value, a transformer to step down the input voltage, and a diode bridge rectifier to convert the input AC signal into DC.

Hardware Components

The following components are required to make NiCd Battery Charger Circuit

S.no	Components	Value	Qty
1	Transformer	12V-16V/4A	1
2	AC Power Supply	230V	1
3	Fuse	500mA	1
4	Diodes	1N5400	4
5	Resistor	0.15 ,2.7K, 100, 22, 2.7, 220Ω	1, 1, 1, 1, 1, 2
6	Transistor	2SC2270, 2SC3622	1, 1
7	Transistor	2N1711	1
8	Transistor	2N3055	1
9	NiCd Battery	–	1

2N3055 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3055

2N1711 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N1711

NiCd Battery Charger Circuit

Working Explanation

The circuit of the NiCd Battery Charger is shown above. This circuit has a built-in automatic current regulator. Because of this, the charging current is regulated to 4 amperes so the charging current gets 4 amperes. The 0.15 Ohms 3W resistor voltage will get 0.7V. Therefore, the transistor 2SC36522 becomes in an ON state and supplies the current to transistor 2N1711 which will short the base of 2SC2270 to the ground and cut off the base current of 2N3055 consequently the way toward charging will begin. Utilize a good heatsink with transistor 2N3055.

Applications and Uses

• Rechargeable nickel-cadmium (NiCd) batteries are broadly utilized in consumer gadgets due to their high energy density, long life, and low self-release rate.
• Standard NiCd cells charges at various rates: a quick charge of high current, or overnight with low current.