Bidirectional High Voltage Conversion Ratio High-Frequency DC/DC Converter with Low Number of Components

In this paper, a coupled-inductor-based bidirectional dc/dc converter is proposed. The proposed converter can achieve a wide conversion ratio range for both step-up and step-down modes by the utilized coupled inductor. A small primary inductor along with the primary capacitor has canceled the input current ripple of the converter on the high current side. This feature would avoid large filters for the terminals. Additionally, the converter has a common-grounded structure between input and output terminals which avoids dv/dt issues. Furthermore, the normalized voltage stress on the switches is lower than the high voltage side of the converter which leads to low switching losses. In this paper, the converter has been analyzed theoretically. The PSCAD/EMTDC simulation results and experimental results of the proposed converter are extracted and presented. The experimental results will be presented in the final version of the paper. It will be implemented for 1MHz frequency operation using GaN to achieve a more compact prototype of the proposed topology.