Design And Construction of a 2.5KVA Uninterruptible Power Supply (UPS)

ABSTRACT 

This project presents the design and construction of Uninterruptible Power Supply (UPS) system with an apparent power of 2.5kVA. This was achieved by the use of transformer, rectifier, inverter circuit and filtering was implemented by the use of smothering circuit using capacitors. We used an inverter that deliver an alternating current (AC) of 220V, 50Hz and the output voltage made to have enough power to drive the load connected to it. The output from the inverter is synchronized in frequency and magnitude with the external power supply so that at power outage, the battery back-up with inverter supply power to the load ensuring that the supply to the load is uninterrupted. This project provides a clean dependable supply of alternating current free surges, frequency variation and transients and it is also used as back-up for electrical appliances to maintain a continuous supply of electric power.