The power consumption of a data center has been dramatically increased recently by more than one order of magnitude, in excess of GW, due to AI related applications. The power majorly draws from 35 KVA medium voltage utilities and in part from renewable energy as well as suitable level of energy storage. The power architecture based on scalable solid-state transformer (SST) is deemed favorable to convert directly from 35KV 3-phase AC lines to 800VDC. Subsequently, at the rack level, 800V DC will be converted to sub-one volt level to power the GPUs. The proposed architecture is deemed simpler, more efficient and flexible for the ever-increasing power demands.

This presentation is focus on the rack level power conversion, namely 800V/48V conversion and targeting at a higher power level, higher power density and efficiency. The topic of 3-phase LLC DC/DC converter is an area infested with patent rights. The purpose of this paper is to help you steer aways from those patent rights and offer you a PCB based heterogeneously integrated solution with higher power density, efficiency and suitable for automation.

Dr. Lee is a University Distinguished Professor Emeritus at Virginia Tech. He is a member of the U.S. National Academy of Engineering, U.S. National Academy of Inventors, and a foreign member of the Chinese Academy of Engineering, China. Dr. Lee founded the Center for power electronics and led a program that encompasses research, technology development, educational outreach, industry collaboration, and technology transfer. To date, more than 230 companies worldwide have benefited from this industry partnership program.

Dr. Lee has supervised to completion 91 Ph.D. and 93 M.S. students. He holds over 100 US patents, and has published over 330 journal articles and more than 760 refereed technical papers. His research interests include high-frequency power conversion, magnetics and EMI, distributed power systems, renewable energy, power quality, high-density electronics packaging and integration, and modeling and control.

Dr. Lee is a recipient of the 2015 IEEE Medal in Power Engineering “for contributions to power electronics, especially high-frequency power conversion."