Research and implementation of an innovative modular non-isolated step-down DC-DC structure with continuous input current based on the Ćuk converter

This study proposes a new design for a non-isolated buck converter with continuous input current. As required, the integration of additional modules into the existing structure permits a significant decrease in the converter's gain to attain significantly lower values. In order to create the proposed converter, the input voltage connections to the Cuk converter were changed. In this configuration, the operational state of the Cuk converter has been changed from buck-boost to step-down by connecting the input power source's negative polarity to the inductor's terminal. In addition, the proposed converter benefits from a common ground between the input source and output port. Moreover, it can achieve a significant reduction in gain by increasing the number of series modules. Finally, the compact converter was smoothly incorporated onto a printed circuit board (PCB) and afterward validated by an output power of 80 watts. The study presents a new design for a non-isolated buck converter with continuous input current, integrating additional modules to decrease gain and achieve lower values. The converter's operational state is changed from buck-boost to step-down, and it benefits from common ground between input source and output port.image