A 96% efficient, 3kW ZVS Three-phase PWM converter for green server power supplies

Greener energy strategies are necessary to reduce carbon dioxide emissions. At IT centers, an element which is suitable for energy management is the server´s Power Supply Unit (PSU). Currently, conventional low voltage high-current DC/DC converters comply with the international standard at 1.5kW range. Further than this level the architecture losses become considerably larger. To handle the continual growth on data centers´ power consume, this work proposes a High-Power-Efficiency Three-phase Zero Voltage Switching (ZVS) DC/DC Converter associated with a Positive Double-Star Active Rectifier with a balanced reduced-current galvanic stage. Operating stages, topology analysis, and experimental results for a 3kW prototype with a 96.86% of efficiency at half the output power load are presented.