TY - GEN
T1 - An Ultrahigh Step-Down DC-DC Converter Based on Switched-Capacitor and Coupled Inductor Techniques
AU - Yu, Longyang
AU - Yang, Chengzi
AU - Mu, Wei
AU - Yang, Fengtao
AU - Li, Huaqing
AU - Wang, Laili
AU - Su, Yuquan
AU - Zhang, Chi
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - High step-down dc-dc converters are widely employed in data center applications. Due to the higher stepdown conversion ratio in the new generation 48V voltage regulator module (VRM), a conventional buck converter is not suitable for such applications. To conquer this problem, a novel dc-dc converter is proposed in this paper to achieve an ultrahigh step-down voltage conversion ratio for data centers. The non-isolated topology can be optimally designed to integrate both the switched-capacitor and coupled inductor techniques, which allows Zero-Voltage-Switching (ZVS) of all active switches to be achieved and improves high efficiency. In addition, the converter presents the advantages of lower voltage stress, ultrahigh voltage gain, common ground and simple control strategy. A comprehensive analysis of the steady-state analysis, derivation of voltage gain, voltage stress and ZVS condition is presented in detail. Finally, a 30W, 48-to-IV experimental prototype is built and tested, which validates the ultrahigh step-down voltage gain and soft-switching characteristic of the proposed converter. The maximum efficiency of the prototype is 89.1% and the efficiency is 81.4% in full-load condition.
AB - High step-down dc-dc converters are widely employed in data center applications. Due to the higher stepdown conversion ratio in the new generation 48V voltage regulator module (VRM), a conventional buck converter is not suitable for such applications. To conquer this problem, a novel dc-dc converter is proposed in this paper to achieve an ultrahigh step-down voltage conversion ratio for data centers. The non-isolated topology can be optimally designed to integrate both the switched-capacitor and coupled inductor techniques, which allows Zero-Voltage-Switching (ZVS) of all active switches to be achieved and improves high efficiency. In addition, the converter presents the advantages of lower voltage stress, ultrahigh voltage gain, common ground and simple control strategy. A comprehensive analysis of the steady-state analysis, derivation of voltage gain, voltage stress and ZVS condition is presented in detail. Finally, a 30W, 48-to-IV experimental prototype is built and tested, which validates the ultrahigh step-down voltage gain and soft-switching characteristic of the proposed converter. The maximum efficiency of the prototype is 89.1% and the efficiency is 81.4% in full-load condition.
KW - Zero-Voltage-Switching
KW - coupled inductor
KW - dc-dc power converters
KW - switched-capacitor
KW - ultrahigh step-down voltage gain
UR - https://www.scopus.com/pages/publications/85123362796
U2 - 10.1109/ECCE47101.2021.9595577
DO - 10.1109/ECCE47101.2021.9595577
M3 - 会议稿件
AN - SCOPUS:85123362796
T3 - 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
SP - 2011
EP - 2016
BT - 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
Y2 - 10 October 2021 through 14 October 2021
ER -
