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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 con verter 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 simulating this circuit in matlab/Simulink Environment, and the results obtained through simulation are validated

EXSISTING SYSTEM

In existing system, PFC rectifiers have been introduced to improve the rectifier power density and reduce noise emissions via soft switching techniques. However, all of these rectifiers operate in DICM and suffers from high switch current stress causing higher conduction losses. PFC rectifiers allow the current to flow through two bridge diodes in addition to the switching component of the converter. This results in higher conduction losses increasing the thermal stresses of the converter. Due to efficiency of the system should reduce.

PROPOSED SYSTEM