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The Interleaved Buck Converter (IBC) having low switching losses and improved step-down conversion ratio is suitable for the applications where the input voltage is high and the operating duty is below 50%. It is similar to the conventional IBC, but two active switches are connected in series and a coupling capacitor is employed in the power path. This IBC shows that since 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%, the capacitive discharging and switching losses can be reduced considerably. This allows the IBC to have higher efficiency and operate with higher switching frequency. In addition, it 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. By replacing the conventional voltage source by a renewable one will enhance its reliability and is more economical. So here the dynamics of a polymer electrolyte membrane fuel cell (PEM Fuel cell) is modelled, simulated and presented. MATLAB -SIMULINK is used for the modelling and simulation of the fuel cell stack. Design and analysis of the converter is done for a DC input of 200V and duty ratio D<0.5. The expected output DC voltage is 24V/10A. Simulation of both conventional and new IBC is done using MATLAB/SIMULINK and their outputs are compared.

Design and MATLAB Simulation of a Fuel Cell Based Interleaved Buck Converter with Low Switching Losses and Improved Conversion Ratio