07-09-2012, 11:06 AM
Bridgeless SEPIC Rectifier with Unity PowerFactor and Reduced conduction Losses
Bridgeless.doc (Size: 20 KB / Downloads: 39)
Abstract:
This Project presents a new bridgeless single-phase ac–dc converter with anautomatic power factor correction (PFC) is proposed. The proposed rectifier is based on the single-ended primary inductance converter (SEPIC) topologyand it utilizes a bidirectional switch and two fast diodes. The absence of aninput diode bridge and the presence of only one diode in the flowing current path during each switching cycle result in less conduction loss and improvedthermal management compared to existing PFC rectifiers. Other advantagesinclude simple control circuitry, reduced switch voltage stress, and lowelectromagnetic-interference noise. Performance comparison between the proposed and the conventional SEPIC PFC rectifier is performed.Simulation and experimental results are presented to demonstrate the feasibility of the proposed technique