Design and Integration Methodology of CM Stripline Inductors and EMI Filters in SiC Power Modules for Low Conductive CM EMI

Silicon carbide (SiC) devices have become increasingly popular in power electronics. The fast-switching performance of WBG devices enables the converter with high power density. But these characteristics also bring serious electromagnetic interference (EMI) issues. Integrating the EMI filer can effectively reduce the EMI generated by the power module. Therefore, this article presents a 650V/39A half-bridge SiC power module with an integrated common mode (CM) EMI filter, achieving low conductive CM EMI. A stripline CM choke was first designed for integration, which has a flat structure and low leakage inductance. Then the structure of the entire power module is designed and analyzed. The proposed module achieves low connection parasitics between the EMI filter and other components. The proposed module reduces EMI in the entire frequency range compared to the power module without filters and reduces the EMI in the high-frequency range compared to the power module with external EMI filters.