We regularly feel the need for an automatic UPS (Uninterruptible power supply) or a battery back circuit. The battery backup circuit includes some surveillance systems like emergency alarms, computers, and other critical devices. It is used to power these critical circuits during the sudden electric breakdown. In this situation, the battery backup or UPS will quickly take up the power load.
The project brief here is a 6V battery backup circuit. The circuit is simple to fabricate. It performs its functions as a scaled-down UPS for 6V gadgets. That way, if the grid power reaches a specific limit. The batteries will consequently take over and keep everything running until the grid power is resumed.
Hardware Components
The following components are required to make Battery Backup Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | Voltage Regulator IC | LM7806 | 1 |
| 2. | Diodes | 1N4002 | 2 |
| 3. | Battery | 12V | 1 |
| 4. | Capacitor | 330nF, 100nF | 1, 1 |
| 5. | Battery Charger or Plug pack | 12V | 1 |
LM7806 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of LM7806
Battery Backup Circuit
Working Explanation
The circuit is utilizing an LM7806 voltage regulator IC. It will scale down the output voltage to 6V. And give a regulated output voltage. The circuit is utilizing a 12V lead-acid battery of any Amp Hour (AH). Which will give backup when the input voltage is missing. The circuit will shift to the battery immediately. Because of this, the operating electronic gadget won’t face any restart.
The output current of the circuit is 1A. Which is appropriate for driving numerous electronic gadgets. It is smarter to utilize an automatic 12V battery charger circuit. Or readymade automatic 12V battery charger rather than a 12V plug pack. In light of the fact that the automatic battery charger won’t overcharge the battery. Evacuate the diode D1 when utilizing a 12V battery charger. Utilize a reasonable heatsink with the IC.
Applications and Uses
- It gives battery backup when the electrical power comes up to fail or drops to an unsatisfactory voltage level.
- It secures electronic gadgets By giving long enough capacity to critical equipment, to shut down gradually and safely
- Use in mobile phone charging
