High-Efficiency Multilevel Converter Technology for Electric Vehicle Applications using Super-Junction MOSFETs

J N McNeill, Xibo Yuan, Philip H Anthony

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

“Super-junction” MOSFETs exhibit low on-state resistances
and low switching losses. However, the reverse recovery
behaviour of their intrinsic diodes and their output
capacitance characteristics make their use in voltage-sourced
converters challenging. If these difficulties can be addressed,
high efficiencies are attainable. Multilevel converters are
potentially attractive topologies in electric vehicle charging
and energy storage applications. Filter components may be
smaller. Also, devices can be combined to give a blocking
capability higher than their individual ratings. For example,
where a vehicle’s battery pack is being charged from or
discharged into a 400V three-phase supply, SJ MOSFETs
rated at 600V can be deployed in a three-level topology to
give a nominal 1200V blocking capability. In this paper, the
challenges presented by the super-junction MOSFET are
tackled in a demonstration 720V, 3kVA, 20kHz, three-level,
three-phase neutral-point-clamped converter.
Original languageEnglish
Title of host publication5th IET Hybrid and Electric Vehicles Conference (HEVC 2014)
Publication statusPublished - 2014

Keywords

  • converter, multilevel, efficiency, super-junction

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