NiMH and NiCd chemical-based batteries, fundamentally have the same attributes from the perspective of charging and discharging features and properties. The normal midpoint voltage is equivalent to 1.2 V. Their discharge voltage is 0.9 V (75% of 1.2 V). These batteries are ordinarily charged with a steady current and permit the battery to ascend to the charge level.
In this DIY tutorial, we are demonstrating a project of an Automatic NiCd and NiMH Battery Charger Circuit. Safe quick charging depends on the charging cycle when observing cleverly. This has now been effectively accomplished in this design. This charger configuration is fit for charging NiCd and NiMH batteries. An intriguing and valuable design of various NiCd and NiMH battery charger circuits that can charge a wide range of NiCd and NiMH batteries.
Hardware Components
The following components are required to make NiCd NiMH Battery Charger Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | Power Diode | 1N4001 | 1 |
| 2. | Transistor | BD135 | 1 |
| 3. | Resistor | 120Ω 0.5W, Rx (As per Need) | 1 |
| 4. | LED | – | 1 |
| 5. | Capacitor | 220µF | 1 |
| 6. | Battery | 12V | 1 |
| 7. | NiCd & NiMH Batteries | 1 |
BD135 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of BD135
NiCd NiMH Battery Charger Circuit
Working Explanation
With the help of the input voltage chart, you can charge numerous voltage batteries. For instance, in the event that you need to charge a 1.2V battery, at that point the base voltage ought to be 6.5V and the most extreme ought to be 10V. You can likewise change the yield current to want an incentive by changing the estimation of resistor RX. The yield current chart is additionally referenced underneath.
It is better to charge a battery of a present ten times smaller than the battery limit. On the off chance that you double the charging current, at that point, the battery will charge in equal parts time. I recommend you to charge the battery for 15 hours on the off chance that you select charging current ten times smaller yet on the off chance that you double the charging current, at that point the battery will become charged in 7 hours.
Applications and Uses
This battery charger may be utilized to charge the batteries of numerous electronic gadgets. For instance,
- Radio
- Mp3 players
- Mobile Phones and lots of other
