Date of Award
Master of Science in Electrical Engineering (MSEE)
Dr. Abbas Fardoun
Dr. Ala Hussein
With the increasing demand for power from the ac line and more strict limits for power quality, power factor correction has gained great attention in recent years. AII basic power converter topologies, such as Boost, Buck, Buck-Boost, and their variations, can be used to realize active PFC techniques. In this research, a new bridge less rectifier that operates with high power factor and high efficiency is investigated targeting LED and battery charging applications. The new topology is a high-power-factor rectifier, which is suitable for universal line base on a modified version of the single-ended primary inductance converter (SEPIC) operating in Discontinuous Conduction Mode (DCM). The new configuration also allows the reduction of the losses associated to the diode reverse recovery current. Furthermore, the proposed topology has wider gain than classical full bridge SEPIC converter, higher efficiency and lower current harmonics. Small signal analysis is used to model the variation affecting the rectifier circuit. Current Injected Equivalent Circuit Approach (CIECA) is utilized in modeling the small signal transfer function of the converter. Feedback control is applied to regulate output voltage around the desired reference and to reduce the effect of disturbances. Simulated results of the output voltage as function of input voltage disturbance and load change are presented.
Ahmed Al Gabri, Ahmed Mohammed, "Wide-Gain Range Bridgeless PFC Modified SEPIC Rectifier" (2014). Theses. 579.