48V bus-based datacentre voltage regulator modules: topology, control and magnetic integration

48V bus-based datacentre voltage regulator modules: topology, control and magnetic integration
A. Prof. Haoyu Wang, ShanghaiTech University


In recent years, with the rapid development of emerging information technologies such as 5G communication, big data, artificial intelligence, block chain, and cloud computing, centralized computation and storage in data center are booming. To meet these growing requirements, a large number of largescale data centers for data computing, processing, and storage are built, and data center is becoming the critical infrastructure to support proper functioning of modern societies.
 The intermediate dc bus voltage in modern data center backend power supply is evolving from conventional 12 V to 48 V. It still requires the voltage regulator modules (VRM) to feed the terminal loads such as memory and computing units operating with very high current (>100A/module) and very low logic voltage (0.8 V-1.8 V). This makes it challenging to optimize the design of load side VRMs with quadrupled input voltage. This talk comprehensive reviews the state-of the-art 48 V VRMs and categorizes them according to passive components utilization. Typical topologies are discussed, analysed and summarized to perform a comprehensive performance comparison, such that the characteristics of different VRMs can be manifested. Some design considerations are also given to facilitate the design of the practical prototypes. Moreover, opportunities and challenges in the future data center power system are presented to provide technical insights.

Dr. Haoyu Wang is an associate professor and the director of PEARL group at ShanghaiTech University. In 2009, Haoyu Wang received his bachelor's degree in electrical engineering with distinguished honor from Zhejiang University in Hangzhou, China. In 2014, he received his Ph.D. in electrical engineering from the University of Maryland, College Park, MD, USA. In Fall 2014, he joined the School of Information Science and Technology at ShanghaiTech University, where he is currently an associate professor with tenure. His research interests include power electronics, plug-in electric and hybrid electric vehicles, renewable energy systems, power management solutions for emerging fields including big data, AI, IoT, etc.
He is the author and co-author of more than 85 peer-reviewed conference and journal papers. As an inventor, he filed 13 China patents. Dr. Wang is a senior member of IEEE and a senior member of China Power Supply Society. He serves as an Associate Editor for IEEE Trans. Ind. Electron., IEEE Trans. Transp. Electrif., and CPSS Trans. Power Electron. Appl. Since 2016, he has served as the track chair for IEEE APEC. He served as the session chairs for prestigious conferences including IEEE APEC, IECON, ECCE-Asia, ITEC, and CPSS annual meetings. He is a reviewer for top-tier journals including IEEE Trans. Power Electron. and IEEE Trans. Ind. Electron. He was invited to give technical talks at IEEE Power Electronics Society Webinar, IEEE Transportation Electrification Webinar, and the 2020 7th international forum on Electrical Engineering and Automation.

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