High Efficiency High Power Density Gan Based Power Supply Unit (PSU) for Data Center Application
Abstract
Abstract
The ever growing consumption of data and its handling has resulted in huge server stations which
cover prime land space and consumes huge amounts of power at low voltages causing high
inefficiency. This work attempts to evaluate the design of a GaN based high efficiency and high
power density server PSU. A two-stage topology is considered where an active front end rectifier
converts 208VAC 3-phase supply to 380VDC. An isolated DC-DC LLC converter employing a
planar integrated matrix transformer steps down the 380VDC to 48VDC for further distribution in
the server rack. The rectifier switches and the primary switches in the LLC are GaN MOSFETs.
The analytical loss and volume model of the converter are derived and a multi-objective design
optimization for reduction in loss and volume is performed. Hence, a suitable converter design
parameter is selected and a prototype design is considered.