Analysis of electromagnetic coupling in hybrid Integrated Power Electronic Module

Electromagnetic compatibility has to be given enough attention in the design of hybrid Integrated Power Electronic Module (IPEM) due to the sharply decreased distance between power devices and the control/driving circuits comparing with conventional power electronic equipment built with discrete devices. The high dv/dt, di/dt and high frequency parasitic ringing caused by the switching circuit can bring serious EMI to the control/driving circuit by the cross-coupling methods. This paper analyzes the capacitive and inductive cross-coupling problems inside IPEM. Finite Element Method (FEM) is used to extract the mutual capacitances between the metal bars in the model. Then the influence of dv/dt can be estimated. The high frequency circulating current in the bridge circuits is also investigated, which results in the magnetic interference by the mutual inductance coupling. The mutual inductance is calculated with the simplified Partial Element Equivalent Circuit (PEEC) approach and image method. The experiment validates the effectiveness of this evaluation. In the end, the electromagnetic shielding is discussed.