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Power Density Maximization in Medium Frequency Transformers by Using Their Maximum Flux Density for DC–DC Converters

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Graduate Program and Research in Electrical Engineering (PGIIE), Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico
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Instituto de Energías Renovables, Universidad Nacional Autónoma de México: Priv. Xochicalco S/N, Temixco 62580, Morelos, Mexico
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(3), 470; https://doi.org/10.3390/electronics9030470
Received: 15 February 2020 / Revised: 4 March 2020 / Accepted: 8 March 2020 / Published: 11 March 2020
(This article belongs to the Section Electrical and Autonomous Vehicles)
The medium frequency transformer (MTF) is a key component of various new DC–DC converters that are designed for applications in modern electrical power grids at medium and high voltage. To attain the high performance that are necessary for targeting these applications, MFTs should have high power density and high efficiency as characteristics. For this endeavor, newly designed MFT procedures, which also take advantages of new core materials, are under investigation. Differently to other design proposals, most of which use conventional transformer design procedures based on equating core losses to copper conduction losses, in this paper, an MTF with a nanocrystalline (VITROPERM 500F) core is designed with a new procedure that is oriented in aiming the maximum flux density (Bmax). The characteristics of the MFTs that are obtained by using this procedure are compared with those of the MFTFs that are designed with a conventional procedure. The results show that by using the proposed technique, we get a 25% reduction in the winding size, a higher power density, and a lower MTF building cost while maintaining a high efficiency (>98%). The design methodology is developed through a rigorous mathematical analysis that is verified with computer simulations in Matlab-Simulink and validated with experimental results from two MTF laboratory prototypes designed at a flux density of 0.9 T (75% Bmax) and 1.2 T (Bmax). View Full-Text
Keywords: converter DC–DC; electric vehicles; renewable energies; solid state transformers converter DC–DC; electric vehicles; renewable energies; solid state transformers
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MDPI and ACS Style

Ruiz-Robles, D.; Moreno-Goytia, E.L.; Venegas-Rebollar, V.; Salgado-Herrera, N.M. Power Density Maximization in Medium Frequency Transformers by Using Their Maximum Flux Density for DC–DC Converters. Electronics 2020, 9, 470.

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