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Energies 2018, 11(2), 266; doi:10.3390/en11020266

Series-Connected High Frequency Converters in a DC Microgrid System for DC Light Rail Transit

Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan
Received: 7 January 2018 / Revised: 17 January 2018 / Accepted: 18 January 2018 / Published: 23 January 2018
(This article belongs to the Special Issue Power Electronics in DC-Microgrid Systems)
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This paper studies and presents a series-connected high frequency DC/DC converter connected to a DC microgrid system to provide auxiliary power for lighting, control and communication in a DC light rail vehicle. Three converters with low voltage and current stresses of power devices are series-connected with single transformers to convert a high voltage input to a low voltage output for a DC light rail vehicle. Thus, Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) with a low voltage rating and a turn-on resistance are adopted in the proposed circuit topology in order to decrease power losses on power switches and copper losses on transformer windings. A duty cycle control with an asymmetric pulse-width modulation is adopted to control the output voltage at the desired voltage level. It is also adopted to reduce switching losses on MOSFETs due to the resonant behavior from a leakage inductor of an isolated transformer and output capacitor of MOSFETs at the turn-on instant. The feasibility and effectiveness of the proposed circuit have been verified by a laboratory prototype with a 760 V input and a 24 V/60 A output. View Full-Text
Keywords: DC microgrid; zero-voltage switching; half-bridge converter; light rail transit DC microgrid; zero-voltage switching; half-bridge converter; light rail transit

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lin, B.-R. Series-Connected High Frequency Converters in a DC Microgrid System for DC Light Rail Transit. Energies 2018, 11, 266.

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