MHz Current-Source Converter With Step-Up Feature Based on Resonant Switched-Inductor Unit

In this article, a current-source converter based on resonant switched-inductor (SI) unit is presented. By integrating multiple resonant SI units, the proposed SI power converter (SIPC) can realize multiple current conversion ratios. Therefore, the proposed converter is suitable for current conversion applications, especially in high-current and low-voltage applications such as the wireless charging of automated guided vehicles (AGVs). By forming a resonant SI unit, the proposed SIPC can operate with zero-voltage switching (ZVS) over the full range of load, which is beneficial for increasing switching frequency, leading to a more compact topology. The theoretical analysis, high conversion ratio SIPC extension, and design considerations are given in detail. Finally, the feasibility of the proposed SIPC including two- and three-times topologies are experimentally tested over a wide range of output power from 80 to 580 W, where two-times topology achieves a maximum efficiency of 95.72% and three-times topology obtains a maximum efficiency 92.91%.