Common mode current mitigation for medium voltage half bridge SiC modules

摘要

Medium voltage 10 kV Silicon Carbide MOSFETs, introduce challenges regarding converter design. Very high rate of voltage change and capacitive couplings to for example cooling systems cause increased electromagnetic interference. The aim of this paper is to accurately model the capacitive coupling to a heat sink and experimentally validate the model. An analytic model of the heat sink is developed which is demonstrated to be in excellent agreement with experimental results. The experimental result validates the modelled heat sink network allowing engineers to choose a suitable grounding impedance to comply with the electromagnetic compatibility regulations.