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An Experimental Comparison of the Effects of Nanocrystalline Core Geometry on the Performance and Dispersion Inductance of the MFTs Applied in DC-DC Converters

Graduate Program and Research in Electrical Engineering (PGIIE), Instituto Tecnológico de Morelia, Morelia 58120, Mexico
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Electronics 2020, 9(3), 453; https://doi.org/10.3390/electronics9030453
Received: 8 February 2020 / Revised: 5 March 2020 / Accepted: 6 March 2020 / Published: 7 March 2020
(This article belongs to the Section Power Electronics)
The development of Medium Frequency Transformers (MFTs) from a novel perspective is essential for the advancement of today´s various relevant applications such as the emerging solid-state transformers, along with interfaces for the interconnection of photovoltaic parks and electric vehicles. The analysis, design and implementation of MFTs pursuing the achievement of characteristics such as high power density, high efficiency, and a specific dispersion inductance is a key goal for designers. There are several parameters and design methods that influence the final performance of an MFT, such as the geometry and material of the core. The advantages/disadvantages of each material/geometry combination, about the dispersion inductance for instance, are not well known, even considering a single material but various geometries. This paper presents the analysis, design and experimental development of three nanocrystalline-core MFTs, each one with a different core geometry (toroidal, type CC and shell-type). The purpose of this work is to evaluate and compare the most favourable characteristics and performance of each type of geometry, tested at 5 kHz and 1.75 kVA. The cases studied, in simulation and experimentation with scaled prototypes, focus on evaluating the power density, the core losses, the winding losses, the geometric dimensions, and the dispersion inductance obtained in each MFT, as well as its performances operating with sinusoidal and square waveforms. The results show that: 1) the toroid core has higher efficiency; 2) the shell core has the lowest dispersion inductance and is easier to build, and 3) the CC type has the highest dispersion inductance. This new information is a step to further understand how to get more controllable, more efficient MFTS, with a higher power density and lower cost, depending on the intended application of cutting-edge DC-DC DAB-type converters. View Full-Text
Keywords: DC-DC converters; medium frequency transformer; nanocrystalline core; solid-state transformer DC-DC converters; medium frequency transformer; nanocrystalline core; solid-state transformer
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MDPI and ACS Style

Ruiz-Robles, D.; Figueroa-Barrera, C.; Moreno-Goytia, E.L.; Venegas-Rebollar, V. An Experimental Comparison of the Effects of Nanocrystalline Core Geometry on the Performance and Dispersion Inductance of the MFTs Applied in DC-DC Converters. Electronics 2020, 9, 453. https://doi.org/10.3390/electronics9030453

AMA Style

Ruiz-Robles D, Figueroa-Barrera C, Moreno-Goytia EL, Venegas-Rebollar V. An Experimental Comparison of the Effects of Nanocrystalline Core Geometry on the Performance and Dispersion Inductance of the MFTs Applied in DC-DC Converters. Electronics. 2020; 9(3):453. https://doi.org/10.3390/electronics9030453

Chicago/Turabian Style

Ruiz-Robles, Dante; Figueroa-Barrera, Carlos; Moreno-Goytia, Edgar L.; Venegas-Rebollar, Vicente. 2020. "An Experimental Comparison of the Effects of Nanocrystalline Core Geometry on the Performance and Dispersion Inductance of the MFTs Applied in DC-DC Converters" Electronics 9, no. 3: 453. https://doi.org/10.3390/electronics9030453

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