Planar bus bar optimum design in high-power converters based on FEM analysis

This paper studies on the design of planar bus bar in the high-power converter. Firstly, the impedance characteristic of planar bus bar and the performance of EMI are analyzed. The design of planar bus bar is restricted by the spatial layout for physical devices. The traditional design method, the partial element equivalent circuit (PEEC), is based on the assumption that the current was uniformly distribution, and the structure was symmetry. So it is hard to get a good result. Here, the finite elements method (FEM) which is based on the Maxwell equations, is adopted for planar bus bar design. According to the planar bus bar design, the boundary term is confirmed, so we can solve the undulation equations. Several designs for an H bridge are shown in this paper, which is constituted by IGBT modules. The ANSYS results show us the distribution of the current and the magnetic field, and works out the planar bus bar inductance value. Through the comparison and optimization of the designs, we can get a final result. The experiment shows that it is a superior method.