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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...
A current-fed ac-dc converter using Gallium Nitride (GaN) power devices has been proposed to realize high power density ISOP (Input Series and Output Parallel)-IPOS (Input Parallel and Output Series) converter-based dc distribution system. The current-fed converter becomes the strong candidate in the ISOP-IPOS converter-based dc distribution system because this system expands the possibility of the...
An inductively coupled contactless dc connector has been proposed for the next-generation 380-V dc distribution system in data centers. A LLC resonant dc–dc converter topology with gallium nitride (GaN) power transistors has been applied to realize the short-distance highly efficient contactless power transfer. A prototype of a 1.2-kW 384- to 192-V connector has been fabricated and the conversion...
Design consideration for the contactless DC connector has been conducted for future high power density 380 V DC distribution system. The power density barrier of 1.2 kW 384 V-192 V inductively-coupled connector based on the LLC resonant converter topology using GaN transistors has been evaluated taking the influences of the circuit configurations, parameters related to the transformer and the semiconductor...
Contactless DC connector has been proposed for high power density 380 V DC power feeding system. A LLC resonant DC-DC converter topology with GaN power transistors and Si-SBDs has been applied to realize high frequency and high efficiency inductively-coupled contactless DC connector. ISOP (input series and output parallel)-IPOS (input parallel and output series) connection topology has been also employed...
Basic building blocks of power converters have been extracted for next generation 380 V DC distribution system. An approach has been proposed for realizing highly efficient and ultra-compact basic converters as bidirectional AC-DC converters, isolated DC-DC converters and non-isolated DC-DC converters. Based on the proposed approach, over 97 % efficient converters with 10 W/cm3 have been fabricated,...
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