Indian Journal of Science and Technology

Abstract

Objectives: There are several applications where even a temporary power failure can cause a great deal of public inconvenience leading to large economic losses.
Methods/Analysis: In this paper the electrical power utilization will give an indirect idea of the economic growth of any country. For such critical loads, it is of paramount importance to provide an Uninterruptible Power Supply (UPS) system, as to maintain the continuity of supply in cases of power outage. Findings: Here a new UPS system with Unity Power Factor (UPF) and low Electro Magnetic Interference (EMI) has been proposed. The circuit diagram of the proposed scheme has been modeled and simulated in SIMULINK Block of the MATLAB software and the waveforms have been taken accordingly. These waveforms give a clear picture of the working and the advantages of the proposed method. Novelty of the study: The study presents a novel UPS with UPF and transformer separation by a high-frequency connectivity in the circuit. The theme was evolved for presenting a lower EMI for soft switching, besides, incorporating frequency content of switching waveforms, especially those related to the input and output of the UPS.
Conclusion/Application: A 1 phase, 230V, 50Hz, simulation circuit, withstanding loading up to 3.2kW, has been presented, and the measurements indicate that lower EMI is possible, and a measurement of Power Factor of 0.996 was attained.

Keywords: EMI, UPS, ZCS, ZVS, Noise