A novel topology of a non-isolated bidirectional multiphase single inductor DC-DC converter

This paper introduces a novel topology for a non-isolated bidirectional multiphase single inductor (BMPSIC) DC-DC converter. The proposed BMPSIC requires only a single inductor, irrespective of the number of arms, and features reduced volume and weight compared to the total magnetics needed for a conventional converter with similar ratings. The proposed BMPSIC advantages include a high DC voltage gain without operating on a large duty cycle, voltage stress on the power switches equal to that at the high-voltage port, easy implementation, and a lower cost for application at high-power densities. Furthermore, this topology requires only one current and voltage control loop. This paper thoroughly details the steady-state operating principles of the inductor current continuous mode. It provides theoretical and mathematical analysis, including a comparative analysis of the proposed BMPSIC against earlier DC-DC converters, highlighting the superior performance and efficiency of the BMPSIC. An 8-kW laboratory prototype, designed as a proof of concept, has been meticulously developed and tested, showcasing the performance of the converter across a broad range of load variations. The efficiency measured for the rated load exceeded 98.2% at the low-voltage port of 250 V and the high-voltage port of 400 V. Additionally, the article features Video S1, which illustrates the functioning of the converter. This paper introduces a novel BMPSIC DC-DC converter that utilizes a single inductor across multiple phases, thereby reducing volume and weight. It achieves a high DC voltage gain without requiring large duty cycles, maintains uniform voltage stress across all power switches-equivalent to that at the high-voltage port-and is cost-effective for high-power densities. Additionally, the design simplifies implementation by requiring only a single control loop for current and voltage. image