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A methodology for realizing a higher‐power‐density DC‐DC converter has been proposed for a power unit installed in a 380‐V DC distribution system. The possibility of the converter design will be strengthened by using the series–parallel connection topology for isolated DC‐DC converters. A converter prototype with a power density of 10 W/cm3 has been fabricated, and the feasibility of the converter...
In recent years, energy consumption has been increasing rapidly due to the increased use of Information and Communication Technology (ICT) systems. As one solution to this issue, 380 V dc power distribution systems have been attracting attention as high-efficiency and high-reliability power systems that can be used in telecommunications buildings and data centers. Against this background, we have...
A consideration of short-circuit protection in high voltage direct current (HVDC) distribution system is written in this paper. There are some types of energy sources in HVDC system, and the behavior of short-circuit current is affected by the way to rectify. Therefore, it may be more complicated to protect short-circuit in HVDC system than it is in AC system. In this study, a protection technique...
In recent years, 380V power distribution systems have been attracting attention as high-efficiency and high-reliability power systems that can be used in telecommunications buildings and data centers. The move toward the proactive use of natural energy, meanwhile, has also been gaining strength. Against this background, we have been moving forward on the construction and experimental study of a container...
In recent years, 380Vdc distribution systems have been expected to be one of the energy saving solutions for telecommunication buildings and data centers. However, DC distribution systems have various problems. In this paper, We report the results of an investigation of inrush current, including current size, effects and testing methods, as one problem in the construction and operation of 380Vdc power...
A high-density bidirectional rectifier was developed not only for telecom and data center applications but also for next generation 380-V DC distribution systems. A conventional rectifier consists of an AC 200-V/DC 380-V power factor correction (PFC) converter and an isolated DC 380-V/DC 380-V converter, and the power flow is unidirectional. Two approaches are proposed for creating a high-density...
A novel approach has been proposed to expand the possibility of high-density converter design. The approach is based on series-parallel connection of low-power isolated dc-dc converters. A DC 384V - DC 384 V 2.4-kW isolated converter with 10 W/cm3 has been fabricated, and experimental results have been shown to confirm the validity of the proposed approach. An advanced approach to achieve more than...
In recent years, higher voltage direct current (HVDC) distribution systems have been developed to reduce power consumption in telecommunication buildings and data centers. Thus, a demonstration test has been conducted to determine the energy efficiency, power stability, and safety of the HVDC system. The demonstration test was conducted in an in-service data center. The test results show that the...
SiC power devices have attracted attention as the next-generation semiconductor devices that surpass silicon devices. The SiC has some superior physical properties when compared with the conventional silicon, and is expected to operate with lower on-resistance and under higher temperature. Furthermore the SiC device has higher thermal conductivity and then has the prominent feature of heat dissipation...
A new approach has been proposed for creating higher power density 200Vac / 380Vdc converters to be installed in 380 V DC distribution systems. This approach requires a high density 3-Phase PWM converter. A SiC-JFETs and SiC-SBDs pair is attractive because of its low conduction loss created by a synchronous rectification and low switching loss by using uni-polar power devices. A design has already...
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