Circuit Modeling of Nanocrystalline Common-Mode Chokes Using Particle Swarm Optimization Embedded Permeability-Dependence Adapter

Common-mode chokes (CMCs) have been widely used in power electronics applications, which not only mitigate electromagnetic interference (EMI) but also safeguard the assets’ immunity. Circuit modeling of CMCs is a crucial procedure in assessing their attenuation performance within a system, finally assisting in filtering optimization and time/frequency-domain simulations. Most existing methods rely on analytical derivation, which may be time-consuming and exhibit complexity for those nanocrystalline CMCs with non-negligible frequency-varying permeability. Therefore, this article proposes a novel circuit modeling method using particle swarm optimization (PSO) with a permeability-dependence adapter (PDA). Specifically, PDA is used to determine the number of stages for the selected circuit topology and PSO serves as a heuristic searching algorithm for estimating the corresponding parameters. Experiments validate the effectiveness of the proposed algorithm, where mean errors are less than 2 dB and 5° in magnitude and phase, respectively.