Conducted Noise Investigation for IMS Based GaN HEMT Power Module by Black Box Model

Boost converters based on GaN components are known to generate high levels of electromagnetic interferences (EMI) in common mode (CM) and / or in differential mode (DM). In this article, it is shown how a part of the CM current comes from the DM source and how to significantly reduce this effect. Solution is based on "balancing" the propagation paths between the positive line and the return line with taking care of a well-balanced inductances and parasitic capacitances distribution. By reducing significantly, CM current total electromagnetic interferences also reduce and thus facilitates compliance with electromagnetic compatibility (EMC) standards. This approach is a good prerequisite for an optimal designing of the filter afterward.