An Expandable Non-Isolated Multiport DC-DC Converter with High Switching Frequency Operation

In this paper, a new non-isolated multiport converter is proposed. In the proposed converter, all switches are operated under zero voltage switching (ZVS) conditions which makes it more efficient for high-frequency operation conditions. The proposed converter by applying a low number of switches compared to other multiport converters, can integrate multiple dc voltage levels. The number of dc voltage ports can be extended to M dc ports (M=2,3, …). The most important characteristic of the proposed converter is having a simple structure with low size and volume even for the integration of multiple dc ports. The proposed converter can integrate M dc ports utilizing M number of switches. Finally, the experimental results of the three-port derived converter verify the operation of the proposed converter by utilizing GaN switches as 27 V/54V/81V with a frequency of 1MHz for different load conditions.