A High Efficiency Boost Preregulator Merging with an Asymmetric LLC Standby Converter in DC Power Distribution System for Data Center
Document Type
Article
Date of Original Version
8-1-2024
Abstract
This article proposes a new structure of the server power supply for the dc power distribution system. The proposed structure consists of a boost converter for the preregulating stage and an asymmetric LLC (ALLC) converter for the standby stage. The switches of two converters are integrated to reduce the number of components. To regulate the output voltages of both stages tightly, a hybrid control of pulsewidth modulation (PWM) and pulse frequency modulation (PFM) is used. The proposed structure features zero-voltage-switching (ZVS) turn-on of switches resulting in a small switching loss. In addition, the snubber is not required in the proposed structure. As a result, higher efficiency than the conventional structure can be achieved. The feasibility of the proposed structure is confirmed with 260-380 Vdc input, 400 Vdc/500 W (boost converter), and 12 Vdc/25.2 W (ALLC converter) output prototype.
Publication Title, e.g., Journal
IEEE Transactions on Power Electronics
Volume
39
Issue
8
Citation/Publisher Attribution
Park, Moo Hyun, Xueshen Zhang, Yeonho Jeong, and Gun Woo Moon. "A High Efficiency Boost Preregulator Merging with an Asymmetric LLC Standby Converter in DC Power Distribution System for Data Center." IEEE Transactions on Power Electronics 39, 8 (2024). doi: 10.1109/TPEL.2024.3379382.