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A transformerless multicellular dc-dc converter has been newly proposed. The capacitively isolated dc-dc cell converters have been applied to develop the multicellular converter without using high frequency transformers. The high voltage transformation ratio is achieved by the ISOP (Input Series Output Parallel) connection topology of the cell converters and the realization of the highly efficient...
A multicellular ac-dc converter is proposed to realize highly efficient dc distribution system in data centers. The proposed converter consists of the singe-phase full-bridge ac-dc cell converters using ultralow loss GaN (Gallium Nitride) transistors and the non-regulated highly efficient isolated dc-dc cell converters. These cell converters are connected in ISOP (Input Series and Output Parallel)-IPOS...
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 inductively-coupled connector. A prototype of a 1.2 kW 384 V–192 V connector has been fabricated under 500 kHz operation. The conversion efficiency of 95%...
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