Design of differential mode filters for two-level and multicell converters

Abstract

Faster switching devices like WideBandGap semiconductors allow increasing the switching frequency that can be used for a given efficiency, and they are sometimes (often?) presented as the solution to increase power density. However, using these components in standard structures can bring far-from-optimal results since they require bigger filters resulting in poor power density. By contrast, we will show that using these components in multicell converters allows increasing the cutoff frequency of the filters.