A NEW BUCK-BOOST CONVERTER WITH HIGH VOLTAGE CONVERSION RATIO AND REDUCED VOLTAGE AND CURRENT STRESS ON SWITCHES AND DIODES

Abstract

This article presents an improved buck-boost converter configuration capable of achieving a high voltage conversion ratio while significantly reducing voltage and current stresses on key components such as MOSFETs and diodes. The proposed design not only enhances operational efficiency but also optimizes system reliability. To provide an objective evaluation, experimental tests were conducted to compare voltage overshoot across switching components, including switches and diodes, relative to the output voltage and to analyze the current overshoot ratio of switches and diodes concerning the input current. Additionally, the overall efficiency of the proposed converter was assessed against existing designs, considering the impact of parasitic resistances in the components. Simulation and experimental results validate the theoretical analysis and demonstrate that the proposed topology outperforms conventional two-switch buck-boost converters in mitigating voltage and current stresses on critical elements. With these advantages, the proposed design holds strong potential for applications demanding high efficiency and long-term stability.