Development of A Cost Effective 2.5kva Uninterruptible Power Supply System

摘要

This paper is on the detailed development of a cost effective Uninterruptible Power Supply (UPS) system for dom estic use. The UPS serves a s a standby / backup power supply unit for power supply from the main commercial supply line. In this paper, an easy to implement block diagram showing all the important units of the UPS system is given. Detailed design showing all calculations and considerations were also included in this work. Also, a simple cost analysis showing the cost of producing this system from the scratch and also the cost of a similar product in Nigeria is also shown. The UPS consists of charge a controlling section, an inverting section, an automatic change-over / switching section a transformation and a load section. The battery is charged through a rectifier. The rectified DC output was achieved using a bridge rectifier and a voltage regulator. The change-over was done by an electric relay whose function is to establish connection between the load and either the mains or the batteries.