JPS_V1_N3_RP2 Naga Smitha Vemula K. Sreekanth B.P. Singh P. Sridhar Journal on Power Systems Engineering 2322–0376 1 3 8 14 PFC; PI Controller; PID Controller; FL Controller With the fast growing information technologies, high efficiency AC-DC front-end power supplies are becoming more and more desirable in all kinds of distributed power system applications due to the energy conservation. However, the supply power factor in converters is low when output voltage is less than the maximum, as the firing angle is large. New recommendations and future standards have increased the interest in power factor correction (PFC) circuits. For improving power quality in terms of PFC, reduced total harmonic distortion at input AC mains and precisely regulated dc output in buck, boost, buck–boost and multilevel modes are cascaded to convert. This paper introduces a closed loop isolated bridgeless AC to DC converter with high power factor and compares different closed loop controls. The Closed loop control strategies using PI, PID and Fuzzy Logic Controllers are compared with simulated results. August - October 2013 Copyright © 2013 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2462