Enhanced power Quality Bridge-less converter using fuzzy logic controller for SMPS applications



The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation.  Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits. This concept presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed SMPS. This paper deals with the design, analysis, simulation, and development of a power-factor-correction (PFC) multiple output switched-mode power supply (SMPS) using a bridgeless buck–boost converter at the front end. Single-phase ac supply is fed to a pair of back-to-back-connected buck–boost converters to eliminate the diode bridge rectifier, which results in reduction of conduction losses and power quality improvement at the front end. The operation of the bridgeless buck–boost converter in discontinuous conduction mode ensures inherent PFC operation and reduces complexity in control. The performance of the proposed multiple-output SMPS is evaluated under varying input voltages and loads by environment. The proposed concept is implemented to fuzzy controlled bridgeless converter using Matlab/Simulink software.

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