A NOVEL INTERLEAVED BUCK CONVERTER WITH CLOSED LOOP CONTROL

Abstract

This seminar report presents a novel Interleaved Buck Converter(IBC) with feed back control. Proposed IBC is suitable for application where input voltage is high and operating duty cycle is less than 50% . In this IBC two active switches are connected in series and a coupling capacitor is employed in the power path. It shows that the voltage stress across all the active switches is half of the input voltage before turn-on or after turn-off when the operating duty is below 50% . So the capacitive discharg ing and switching losses can be reduced considerably. It allows proposed IBC to have higher efficiency and operate with higher switching frequency. In addition, the proposed IBC has a higher step-down conversion ratio and a smaller output current ripple compared with a conventional IBC.Closed loop control using PI controller has been done to improve the system performances. Closed loop control provides a good regulated output voltage. Simulation can be carried out to study the performance of the proposed topology in MATLAB R2010a environment.