Modeling, simulation and design of an improved high power factor bridgeless sepic converter

摘要

Switch Mode Power Supply (SMPS) designs are normally have a power quality issues due to the harmonic distortion produce in the system. Therefore it is essential to incorporate a power factor correction (PFC) circuit in SMPS design. Although, the boost converter is more popular to use with PFC circuit, SEPIC converter can produce an input current with lower ripple value. However, since it involved with 4 energy storage component, a bridgeless SEPIC converter were used as the bridgeless circuit reduce the component conducted in ech switching cycle compared to conventional SEPIC. Therefore this thesis focuses on designing the bridgeless PFC SEPIC converter that operate in CCM with two types of controller. The controllers are Average Current Control Mode and Peak Current Control Mode. Simulation of the bridgeless SEPIC PFC circuit were done using MATLAB Simulink software. The results show that the Average Current Mode Control produce high power factor with low harmonic distortion compared to Peak Current Mode Control. At the end of this thesis, a suitable recommendation and suggestion were made to improve the project design