UT Power Engineering Laboratory - "Powering the Future"

An All-SiC Three-Phase Buck Rectifier for High Efficiency Data Center Power Supplies


Dr. Leon M. Tolbert
Fan Xu
Ben Guo
Fred Wang
Benjamin J. Blalock


The high voltage DC distribution architecture in telecommunication and data centers has been presented to have superior efficiency and reliability compared with the traditional AC architecture. A 7.5 kW, liquid cooled, three-phase, front-end rectifier for high voltage DC distribution architecture is designed, using SiC MOSFETs and Schottky diodes, with 480 input line-to-line voltage and 400 Vdc output voltage.
SiC power devices are selected and paralleled to reduce devices' losses. The input and output filters are designed and optimized to reduce passive components' losses. 98.54% efficiency of the rectifier is achieved at full load.


Fig. 1. Prototype

Related publications and presentations

1. F. Xu, B. Guo, L. M. Tolbert, F. Wang, and B. J. Blalock, Evaluation of SiC MOSFETs for a high efficiency three-phase buck rectifier. IEEE Applied Power Electronics Conference and Exposition (APEC), 2012, pp. 1762-1769.

2. F. Xu, B Guo, L. M. Tolbert, F. Wang, and B. J. Blalock, Design and performance of an all-SiC three-phase buck rectifier for high efficiency data center power supplies. IEEE Energy Conversion Congress & Exposition (ECCE), 2012.

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Min H. Kao Engineering Building