Abstract

SiC MOSFETs are currently the most appropriate solution for high-efficiency conversions at low kilovolts (<10 kV). For higher voltages, the series connection of SiC MOSFETs shows great promise. However, voltage sharing remains a significant technical challenge. This article proposes an active voltage balancing approach for a stack of N SiC MOSFETs, achieved through precise adjustment of turn-off delays based on real-time voltage feedback. Using an analytical model tailored to describe voltage sharing, a control method is designed, configured, and evaluated. Control behavior is experimentally validated on hard switching converters.

Cédric Mathieu de Vienne, Pierre Lefranc, Pierre-Olivier Jeannin, Bruno Lefebvre, Besar Asllani 

Presented at IET Power Electronics 

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