Switched Capacitor Based High Gain Boost Converter for Renewable Energy Application

This article presents an improved nonisolated high-voltage gain boost converter with a switched capacitor and reduced voltage stress across the switches for low-voltage applications. In the proposed topology, a coupled inductor (CI) and a switched capacitor (SC) are incorporated to get a high voltage gain. The output of the CI has low-voltage ripples, which reduces the size of the output filter capacitor. Further, SC and CI form a resonating circuit that helps to achieve zero voltage switching and zero current switching at full load. Additionally, stress across the switches is reduced, leading to low-rated switches utilization, which makes it cost effective. The bridge diode, coupled with a SC and mutual inductor, inherently works as a snubber circuit for switch protection. A converter with an input voltage of 48 V and an output voltage of 380 V is developed in this article to meet the requirements of a grid-connected inverter for household applications. Finally, an experimental 500-W high-gain boost converter prototype is developed, tested, and the simulink results are verified with hardware results. It has been found that the converter is 96.20% efficient at full load and achieves low stress across the switches.