The rapid rise in the power consumption of datacenters, coupled to the growth of Artificial Intelligence training and inference, is forcing an evolution in rack power delivery architectures as rack power levels are pushed beyond 100 kW. Future data centers are expected to utilize ultra-dense, in-rack three-phase rectifiers and 800 V distribution to mitigate distribution losses and cabling weight. This work discusses the design and evaluation of a flying capacitor multilevel (FCML) converter as a three-phase PFC rectifier for future data center power delivery networks, where efficiency and size will be increasingly important. This work presents several innovative solutions related to EMI, PS-PWM control, and gate driving to address practical considerations. A hardware prototype was constructed to validate the result. Successful operation was demonstrated at Vdc = 700 V and Pout = 3.34 kW at an efficiency of 98.34%.
