Three-Port Series-Resonant Converter DC Transformer with Integrated Magnetics for High Efficiency Operation

Kevin Tomas Manez, Zhe Zhang, Yudi Xiao

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Abstract

The series-resonant converter has become a very attractive topology for solid-state transformers due to its fixed voltage gain and soft-switching conditions when operating at the resonance frequency. This paper presents an open-loop three-port series-resonant converter (TP-SRC) capable of interconnecting three dc microgrids. High efficiency power electronics is a key enabler for the future dc distribution systems. In this paper, efficiency optimization and rms current reduction of the TP-SRC is achieved by a detailed analysis of the resonance frequency and dead-time selection. The analysis is supported by a losses modelling of the main components of the converter. In addition, Gallium Nitride (GaN) MOSFETs are used to reduce semiconductors’ losses. Furthermore, the resonance inductance of the distributed resonant tank has been integrated into the leakage inductance of the transformer and the PCB parasitic inductances. In order to ensure a fixed resonance frequency, an experimental resonance frequency matching methodology for the resonant tank has been presented. Experimental results were obtained for a 1.4 kW featuring a peak efficiency of 98.8 %.
Original languageEnglish
Title of host publicationProceedings of IEEE Energy Conversion Congress and Exposition
PublisherIEEE
Publication date2018
Pages5622-5629
ISBN (Print)9781479973118
DOIs
Publication statusPublished - 2018
EventTenth Annual IEEE Energy Conversion Congress and Exposition - Oregon Convention Center, Portland , United States
Duration: 23 Sep 201827 Sep 2018
http://www.ieee-ecce.org/2018/

Conference

ConferenceTenth Annual IEEE Energy Conversion Congress and Exposition
LocationOregon Convention Center
CountryUnited States
CityPortland
Period23/09/201827/09/2018
Internet address

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