Multi-cell rectifier using GaN-FET for highly efficient next generation 380-V dc distribution system

Highly efficient multi-cell rectifier using low-voltage GaN transistors has been proposed for future 380-V dc distribution in data centers. A 98.8% full-bridge 33- to 48-V ac-dc cell converter has been developed by using GaN transistors. This cell converter maximizes the performance of the multi-cell rectifier based on the series-parallel connection topology of isolated power converters. The potential to achieve the efficiency of 97.0% has been also shown for the ac 200- to dc 380-V multi-cell rectifier taking its detailed circuit configuration into account. The multi-cell converter topology is attractive not only for the energy saving in data centers but also for the widespread use of low-cost and standardized converters. The proposed rectifier contributes to realizing the next generation dc distribution system for the future low carbon society.