This paper presents a novel DC-DC converter for electric vehicle (EV) charging applications in DC microgrids. The proposed converter utilises highly efficient wide band gap (WBG) semiconductor devices that are rated for 650 V, but can provide a wide output voltage range up to 1 kV to accommodate for EVs that utilise high voltage battery, while significantly reducing the inductors’ cost and size at the same time, thanks to the multi-level, interleaved structure. The multi-level structure allows the converter to scale vertically, by distributing the full operating voltage across multiple stages, and helps decrease the ratings and cost of capacitors; whereas the interleaved structure enables the converter to scale horizontally, by sharing the full operating current across multiple interleaved branches, thus reduce the current rating of the inductors. The performance of the proposed DC-DC converter is verified by simulation results.

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A Multi-level Interleaved Wide Range DC-DC Converter for Electric Vehicle Charging in DC Microgrids

  • Hao Deng,
  • Zifan Lin,
  • Xinan Zhang,
  • Herbert Ho-Ching Iu,
  • Tyrone Fernando

摘要

This paper presents a novel DC-DC converter for electric vehicle (EV) charging applications in DC microgrids. The proposed converter utilises highly efficient wide band gap (WBG) semiconductor devices that are rated for 650 V, but can provide a wide output voltage range up to 1 kV to accommodate for EVs that utilise high voltage battery, while significantly reducing the inductors’ cost and size at the same time, thanks to the multi-level, interleaved structure. The multi-level structure allows the converter to scale vertically, by distributing the full operating voltage across multiple stages, and helps decrease the ratings and cost of capacitors; whereas the interleaved structure enables the converter to scale horizontally, by sharing the full operating current across multiple interleaved branches, thus reduce the current rating of the inductors. The performance of the proposed DC-DC converter is verified by simulation results.