Single-wing resonant multilevel converter featuring reduced number of resonant inductors

摘要

This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage of proposed converter in this paper is high voltage conversion ratio with capacitor voltage stress always being only two times of the low side voltage. Additionally, the proposed circuit (SWRMC) shares all of the advantages from the (MMSCC) type converters such as soft switching, low voltage device rating, bidirectional operation, high conversion ratio, extremely high or low environment temperature operation, basic control algorithm and modular structure. In comparison with the magnetic core based converter the converter proposed in this paper is found to be superior due to the simple structure, soft switching, low conduction loss and 97% or higher efficiency.