Interleaved Buck Converter Having Low Switching Losses and Improved Step-Down Conversion Ratio
In this paper, a new interleaved buck converter (IBC) having low switching losses and improved step-down conversion ratio. 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 discharging 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 higher step-down conversion ratio and smaller output current ripple than a conventional IBC. The proposed converter is digitally implemented in a PIC16F877A microcontroller. Simulation can be carried out to study the performance of the proposed topology in MATLAB/SIMULINK environment.