Modified interleaved buck converter implementation for higher step-down conversion ratio

This paper presents Modified Interleaved Buck Converter (MIBC) model which has lower inductor ripple current and higher step-down conversion ratio. This converter is applicable where the input voltage is high and the output voltage is low. Three MOSFETs are connected in series and two coupling capacitors are used in the power path. The converter is working in higher switching frequency and operating duty is below 50%. The proposed MIBC results higher step-down conversion ratio with smaller output current ripple compared with a conventional Interleaved Buck Converter. The converter design, modes of operation, and corresponding simulation results of the proposed MIBC are presented in this paper. The analysis of MIBC is validated by the simulation results of prototype converters with 200V input, 10V/4.3A output.