Majid AliHafiz Zahid RasoolMajid Rehan Khan2013-10-102013-10-105/23/2013https://escholar.umt.edu.pk/handle/123456789/799Project Advisor: Mr. Farhan IqbalUPS stands for Uninterruptible Power Supply. It is an instrument connected between the electric grid and the consumer, comprising of electric hardware and rechargeable batteries. The aim of the instrument is to supply continuous undisturbed and conditioned power to the critical load. The energy for powering the load comes from the utility, or from the battery upon mains outage. Uninterruptible Power Supply (UPS) are widely used to provide emergency power to critical loads in case of utility mains failure, and as such constitutes an essential element in providing back-up power for computer networks, communication links, biomedical equipment, and industrial processes, among others. In market local ups designed for just power production using batteries or such types of power sources. They do work but not for all environment. We implement intelligent uninterrupted power supply(i-UPS) for multipurpose. It consists of microcontroller based circuit. Mainly four feature of our i-UPS. First, it is safe and Improvesbattery life by using temperature sensor. When battery is fully charged and comparator do not trip battery charging then microcontroller will come into work trip the battery charging by temperature sensing because heating hardens the battery and it loses its efficiency and life. Second, we provide two outputs from i-UPS, Load-1 and Load-2, Load-1 controls lights, chargers and low power electronics appliances. On the other hand, Load-2 controls the fans and inductor type loads. Third is Energy saving works in the form of battery status. When battery is at its critical situation it switches offLoad-2 and lets the Load-1 on. So we can get lights at low battery status. When main supply is on, automatically Load-1 and Load-2 are connected to main supply. Fourth, we have provided two main energy sourcesLine-1 and Line-2 from different feeders. Microcontroller automatically checks and selects the active Line. If both lines are active then microcontroller will select Line-1 by default setting. This Intelligent Uninterruptible Power Supply (i-UPS) will enable the users to monitor different status of i-UPS on LCD. One of the advantage applying microcontroller for the Intelligent Uninterruptible Power Supply (i-UPS) is that the system is more reliable and user friendly in functions as compare to the conventional Uninterruptible Power Supply available in the market. At the competition of our project we will be hopefully able to save energy and utilization of energy due to intelligent uninterruptible power supply because of our country facing a large amount of electricity crises so people wants such type of ups like i-UPSenBS ThesisElectrical Engineeringpower supplyThesis