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Article

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

1
Fraunhofer Institute for Integrated Systems and Device Technology IISB, 91058 Erlangen, Germany
2
Institute of Power Electronics, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), 90429 Nuremberg, Germany
*
Authors to whom correspondence should be addressed.
Academic Editor: Lucia Frosini
Electronics 2022, 11(12), 1818; https://doi.org/10.3390/electronics11121818
Received: 16 May 2022 / Revised: 30 May 2022 / Accepted: 6 June 2022 / Published: 8 June 2022
This paper proposes a portable 11 kW off-board charger for electric vehicles. In the ac/dc stage, a three-phase power factor correction (PFC) in Vienna topology is chosen. The loss and volume of the PFC inductance are calculated over a wide range of parameters and optimized with regard to design, winding, and core material. A three-phase LLC resonant converter operating at 1 MHz is chosen for the galvanically isolated dc/dc stage. A parametrizable loss model of the high-frequency transformer and the resonance inductor is developed to minimize volume, weight, and losses. With the help of an automated algorithm using these loss models, the inductive components are optimized in terms of winding specification, magnetic material, and core geometry, verified by finite element analysis and measurements. For the ac/dc stage, 900 V SiC devices are adopted, and 1200 V SiC devices are used in the primary and secondary sides of the dc/dc stage. A variable dc-link voltage is utilized to adjust the charging profile and to operate the LLC resonant converter at the most efficient point near the series resonance frequency. A mechatronically integrated portable air-cooled off-board charger prototype with 11 kW, three-phase 400 VAC input, and 620–850 VDC output is realized and tested. The prototype demonstrates a power density of 2.3 kW/liter (37.7 W/in³), a peak efficiency of 96%, and 95.8% efficiency over the defined battery voltage range. View Full-Text
Keywords: resonant power conversion; DC–DC power conversion; AC–DC power conversion; battery chargers; mobile power supplies; road vehicle electric propulsion resonant power conversion; DC–DC power conversion; AC–DC power conversion; battery chargers; mobile power supplies; road vehicle electric propulsion
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MDPI and ACS Style

Ditze, S.; Ehrlich, S.; Weitz, N.; Sauer, M.; Aßmus, F.; Sacher, A.; Joffe, C.; Seßler, C.; Meißner, P. A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles. Electronics 2022, 11, 1818. https://doi.org/10.3390/electronics11121818

AMA Style

Ditze S, Ehrlich S, Weitz N, Sauer M, Aßmus F, Sacher A, Joffe C, Seßler C, Meißner P. A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles. Electronics. 2022; 11(12):1818. https://doi.org/10.3390/electronics11121818

Chicago/Turabian Style

Ditze, Stefan, Stefan Ehrlich, Nikolai Weitz, Marco Sauer, Frank Aßmus, Anne Sacher, Christopher Joffe, Christoph Seßler, and Patrick Meißner. 2022. "A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles" Electronics 11, no. 12: 1818. https://doi.org/10.3390/electronics11121818

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