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.

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68 comments

  6. please send me a complete circuit and schematic diagram of 600W UPS System and every detail about the UPS.Thank you

  7. i need full working principle of ups . that is i want to know how it is changing batteries. please,send me fast i need so much. thank you.

  8. cntact me at eehafiz90@yahoo.com about transformer designing from low level to high level. even final year project regarding transformer

  11. it very complicated “reason”. the first you need to do ti to check the voltage before and after the transformer. be careful since it has high voltage output

  12. i want to know….why inverter ups fault?what the reason?and how to solve this problem?

  13. hi, dear friends, i have made a little bit research on transistor, if any body is interested to have the discusion with me on this topic. .Feel free to contact me on:
    afaque.manzoor@iba-suk.edu.pk
    03338864849

  17. dear sir,
    Please send basic ups diagram of 1000VA and how to mange the problems

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