Basic UPS Circuit 5V and 12V DC

electronic circuit diagram

The above diagram is a basic Uninterupted Power Supply (UPS) circuit. This basic UPS circuit is a very simple and inexpensive.

This circuit can be adapted/modified for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply, you may apply two 12V batteries connected in series (it will become 24V) including a 7815 regulator (will be 15V stabilized voltage output). There is a lot of flexibility in this circuit.

TR1 has a primary matched to the local electrical supply which is 240V in the UK (it might be various for other countries, 110/120V or 220/240V). The secondary winding should be rated at least 12 Volts at 2 Amperes, but can be higher, for example 15 Volts. FS1 is a slow blow type and protects against short circuits on the output, or indeed a faulty cell in a rechargeable battery. LED 1 will light ONLY when the electricity supply is present, with a power failure the LED will go out and output voltage is supplied by the battery.

The capacity to keep up the regulated supply with no electrical supply relies on the load taken from the UPS and also the Ampere hour capacity of the battery. In the event that you were utilizing a 7A/h 12V battery and load from the 5V regulator was 0.5 Amp (and no load from the unregulated supply) then the regulated supply would be maintained for around 14 hours. Greater A/h capacity batterieswould give a more drawn out standby time, and the other way around.

The complete explanation about this basic UPS circuit, please go to this page.

68 comments

  1. dear sir/maam,
    I am an engg. student and need to make a simple ups as my project . it would be grateful if u please send me an easy to construct and make working ups .

  2. please send me a complete circuit and schematic diagram of 12V UPS System and every detail about the UPS.Thank you

  3. Dear sir,
    Iam an electrical &electronic student of nattakom polytechnic. I need a circuit diagram for ups of 12v battery . This circuit is used for my project work please send me circuit diagram and details.

  4. Please do you have a component that can help boost 0.5 dc up to 12 dc or a bit below?
    Please reach me through dejiola2001@aol.com

  5. sir kindly send me the simple ckt diagrams of elt ckts like ups inverter m in dae 3rd year i need an idea to make a project would u like to me sir i,ll be gratfull to you

    thank you

  6. Whether an isolation transformer is required technically on incoming and outgoing side of the UPS system? The UPS system (10 kVA) is envisaged for a reverse osmosis plant.

  7. Dear sir,
    Iam an electrical &electronic student of nattakom polytechnic. I need a circuit diagram for 1KVA ups of 12v battery . This circuit is used for my project work please send me circuit diagram and details.

  8. Dear sir i am take my final year project is seawater battery.One cell of saltwater battery is contain 0.5v and 3mA. To seres the cell to increase voltage 12V and parallel the cell 6mA are produced.This 12v,6mA are increased to 12V,5A output. please send the circuit diagram and details

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