Introduction
Batteries are of no use if we don’t have a charger with them. Charger circuits play a crucial part in electronic devices and circuits. Thus the charger circuits depend on the battery type. Different electronic devices use different batteries for their circuits. For example, considering the Gel cell Battery, the charger circuit employed might not be adopted by some others. So we have decided that in this tutorial, we are going to “NiMH Battery Charger Circuit”
An Overview of NiMH Battery
Nickel Metal Hydride Battery (NiMH) battery has nickel oxide inside as the active material for its positive electrode and hydrogen as its negative electrode. This battery is rechargeable and below we have given its charging circuit details. We usually use the battery in portable devices like mobile phones, pagers, electric razors, hybrid automobile cameras, and other compact gadgets.
Hardware Required
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Transformer | 0-12V AC | 1 |
| 2. | Diode | 1N4007 | 4 |
| 3. | LED | – | 2 |
| 4. | PNP Transistor | TIP127 | 1 |
| 5. | Capacitor | 330µF | 2 |
| 6. | Resistor | 47Ω, 10Ω, 2KΩ, 1KΩ | 1, 1, 1, 1 |
| 7. | Battery | 9V | 1 |
Circuit Diagram
Working Explanation
This NiMH Battery Charger Circuit first uses the transformer that steps down AC voltage from 230V to 12V. After that, it needs a bridge rectifier circuit to convert that Ac voltage to the DC voltage. After the rectifier circuit, it may have ripples in it, the capacitor in the circuit would remove that. Then there is TIP125 which is generally used for switching and amplification applications. The LED is connected to the circuit to indicate the presence of DC voltage. You can get the 9V DC at the output side which you can use for charging the NiMH battery.
Application and Uses
The circuit is for the NiMH Battery and can be utilized everywhere where this battery may get used. For example,
- Hybrid Automobiles.
- Electric razors
- Mobile phones
- Cameras, etc.
