Abstract
The interruption of power supply is a source of concern to the consumer, and gives rise to the need to provide emergency power source in some important areas of both domestic and industrial application. This has led to the design and construction of the Uninterruptible Power Supply (UPS). In this work, we made use of solid state components, with the aid of background knowledge in the field of electronics, to locally manufacture a UPS which could be used for back-up power for critical and essential loads. For the design, a battery is used to provide direct voltage and current, which is inverted by the inverter. The inverted 12v a.c., 50 Hz, is transformed using the transformer to 240v a.c., 50Hz. The system also has in-built voltage reversal protection, automatic change-over and battery charger, which recharges the battery for continuous use when mains supply is restored. The output power of the constructed device was found to be 290 watts (determined by power transistor), which gives a percentage error of 3.3%.
Highlights
Every electrical and electronic equipment needs to be energised by means of a power supply
In most cases the power is required to be delivered to the load circuit at steady or fixed voltage. Stability of such main power supply is a source of concern because insufficiency and accompanying power outage have always posed major setbacks to individuals and organizations which depend on sensitive electronic equipment that require constant power supply
Power outage is an unavoidable phenomenon and the need for reliable back up or emergency power supply system cannot be overemphasised, which is what has led to the design of this project
Summary
Every electrical and electronic equipment needs to be energised by means of a power supply. In most cases the power is required to be delivered to the load circuit at steady or fixed voltage Stability of such main power supply is a source of concern because insufficiency and accompanying power outage have always posed major setbacks to individuals and organizations which depend on sensitive electronic equipment that require constant power supply. Such interruption of mains supply has caused serious inconveniences especially in highly sensitive devices such as computers, medical equipment and industrial research laboratories where interruption of power could spell danger. The objective of this article is to present a UPS that has been designed and built to overcome some of these setbacks by having an operation period or autonomy of up to 2 hours
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