Development of 400-Vdc output rectifier for 400-Vdc power distribution system in telecom sites and data centers

We outline the specifications and performance of a 400-Vdc distribution system and 400-Vdc output rectifier prototypes. In 2008, The NTT-group began developing a 400-Vdc distribution system for reducing power consumption and the usage of materials, such as copper in power cables. In conjunction with this project, NTT Facilities developed prototype rectifiers, a prototype voltage compensator used during interruption periods, and a prototype battery charger in 2008, and reported a portion of their verification test results. From their developments, we found some problems for installing and operating in telecommunication buildings and data centers. Therefore, we developed new prototypes for resolving these problems. They have almost equal efficiency and output regulation, saving installation space, and they are more maintainable and safer for operating than previously developed prototypes.