TY - GEN
T1 - Multi-Ratio DC-DC Converter Based on Resonant Switched-Capacitor and Sigma Architecture
AU - Fu, Yu
AU - Zhao, Jieyun
AU - Zhao, Yucheng
AU - Qi, Jingjing
AU - Fan, Di
AU - Li, Shouxiang
AU - Xie, Wenhao
N1 - Publisher Copyright:
© Beijing Paike Culture Commu. Co., Ltd. 2026.
PY - 2026
Y1 - 2026
N2 - In data centers, the 48 V two-stage vertical power distribution architecture operates within the 36 V–60 V voltage range of backup batteries under emergency conditions, leading to significant intermediate bus voltage fluctuations. To address this challenge, this paper proposes a switched-capacitor based multi-ratio DC-DC converter as an intermediate bus converter (IBC), which suppresses voltage fluctuations by dynamically adjusting its step-down ratio. Derived from the Sigma architecture, the proposed IBC employs modulation schemes that enable zero-current switching (ZCS) in each submodule, ensuring high conversion efficiency. To further enhance gain flexibility, an optimized topology is introduced, incorporating an auxiliary switch to optimize current distribution among submodules. Experimental results demonstrate that the proposed IBC can seamlessly reconfigured during bus voltage fluctuations, effectively stabilizing the output voltage within the range of 5.14 V to 6 V. Additionally, both power density and conversion efficiency are superior in comparison to conventional solutions.
AB - In data centers, the 48 V two-stage vertical power distribution architecture operates within the 36 V–60 V voltage range of backup batteries under emergency conditions, leading to significant intermediate bus voltage fluctuations. To address this challenge, this paper proposes a switched-capacitor based multi-ratio DC-DC converter as an intermediate bus converter (IBC), which suppresses voltage fluctuations by dynamically adjusting its step-down ratio. Derived from the Sigma architecture, the proposed IBC employs modulation schemes that enable zero-current switching (ZCS) in each submodule, ensuring high conversion efficiency. To further enhance gain flexibility, an optimized topology is introduced, incorporating an auxiliary switch to optimize current distribution among submodules. Experimental results demonstrate that the proposed IBC can seamlessly reconfigured during bus voltage fluctuations, effectively stabilizing the output voltage within the range of 5.14 V to 6 V. Additionally, both power density and conversion efficiency are superior in comparison to conventional solutions.
KW - DC-DC converter
KW - Switched-capacitor
KW - zero-current switching
UR - https://www.scopus.com/pages/publications/105042733144
U2 - 10.1007/978-981-95-9287-6_59
DO - 10.1007/978-981-95-9287-6_59
M3 - Conference contribution
AN - SCOPUS:105042733144
SN - 9789819592869
T3 - Lecture Notes in Electrical Engineering
SP - 613
EP - 623
BT - The Proceedings of 2025 International Conference of Electrical, Electronic and Networked Energy Systems - Volume 3
A2 - Li, Yong
A2 - Xu, Zhihong
A2 - Tang, Longfei
A2 - Song, Kai
A2 - Li, Zhengmao
A2 - Liu, Yonghui
PB - Springer Science and Business Media Deutschland GmbH
T2 - International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2025
Y2 - 31 October 2025 through 2 November 2025
ER -