Research on Full-Circuit Model of Common-Mode Choke

This paper establishes a four-port equivalent circuit model of common-mode choke including common mode and differential mode characteristics, which facilitates system simulation. Firstly, impedance characteristic tests are performed, such as common mode, differential mode, and open-circuit. Based on the test results, an optimized equivalent circuit model is developed by enhancing a typical RLC parallel circuit model. The model parameters are solved using a genetic algorithm as a nonlinear optimization problem. Subsequently, a comprehensive four-port equivalent circuit model is established for the common-mode choke, encompassing common mode and differential mode behaviors. Finally, the effectiveness of the proposed choke circuit model is validated by the comparisons of the simulation and the test results.