A Scalable High-Voltage Gain DC/DC Converter With Reduced Voltage Stress for DC Microgrid Integration

Abstract

The conventional quadratic boost converter produces a high voltage gain. However, it has drawbacks, like switch voltage stress equal to the output voltage of the converter. This research introduced a novel approach: a scalable high-voltage gain converter strategically designed to address the voltage stress experienced by the switch and achieve a noteworthy reduction. This voltage stress reduction is applicable to all the stages of the proposed converter. It is worth highlighting that the converter ensures continuous input current and is configured with a common input and output ground, further enhancing its practicality. This study delves into an exhaustive steady-state analysis covering both the continuous and discontinuous conduction modes and the nonideal model. Furthermore, a comprehensive comparative analysis is presented, pitting the design and performance of the proposed converter against their recent high-gain counterparts. To evaluate dynamic performance, a small signal model is created. To confirm the dynamic and steady-state performance, a prototype of the proposed converter configuration is fabricated and tested, achieving a 48- to 650-V conversion and delivering 500 W of output power.