A Resonant Switched-Capacitor LLC DCX in Data Center Applications

Image credit: PEAS

Abstract

In this paper, a novel resonant switched-capacitor LLC topology is proposed to serve as the dc transformer (DCX) in data center applications. The proposed DCX is formed by a 2:1 resonant switched-capacitor cell and an LLC converter. To achieve a 4n:1 voltage step-down ratio, only an n:1 turns ratio transformer is required. It presents good soft-charging and softswitching performances to effectively mitigate charge distribution loss and switching loss. Furthermore, the voltage stresses of primary switches are only half of the input voltage, and the current stresses are also lower than that of conventional LLC converter. The operational principle of steady-state circuit and theoretical analysis are provided to highlight its advantages. To verify the proposed concept, a 300W-rated hardware prototype that converts 48 V to 12 V is designed and tested with 1MHz switching frequency.

Date
Nov 10, 2023 8:00 AM — Nov 13, 2023 7:00 PM
Location
Guangzhou Yuexiu International Congress Center
Guangzhou Yuexiu International Congress Center, 119 Liuhua Rd, Yuexiu District, Guangzhou, Guangdong 510170
Jiawei Liang (梁家伟)
Jiawei Liang (梁家伟)
Ph.D. candidate of Power Electronics

My research interests include switched-capacitor converter, point-of-load converter, and magnetic integration in data center applications.