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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...
An active gate controlled power transfer switch using SiC-MOSFET is proposed to achieve the fault tolerant operation of ISOP (Input Series and Output parallel) multicellular dc-dc converter. The SiC-MOSFET with high temperature capability simplifies the configuration of the protection circuit, and the control of its on-resistance by the active gate control realizes the smooth protection without the...
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...
To achieve high power-density isolated dc-dc converter, gallium nitride high electron mobility transistors (GaN-HEMTs) and planar transformer have been used. Also, for the high power-density design, these components are placed close to each other. GaN-HEMTs are significantly affected by the leakage flux of the planar transformer, because of their lateral structure. Therefore, the mutual effects of...
In this paper, the influence of parasitic components of LLC resonant dc-dc converters operated at MHz-level switching frequency is investigated. In MHz-level switching frequency, value of the parasitic components are getting closer to value of circuit parameters. Therefore, influence of the parasitic components cannot be neglected even in the initial step of the circuit design. In particular, undesirable...
This paper investigates several factors affecting EMI-performance of digital controllers targeted at conducted-noise reduction in dc-dc converters. Four factors have been studied: frequency modulation profile, randomization ratio percentage, clock frequency, and spread-spectrum scheme. The field-programmable gate arrays (FPGAs) have made substantial improvements in price and performance throughout...
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