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Open AccessArticle

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