A Fast Time-Step Selection Method for Explicit Solver-Based Simulation of High Frequency Low Loss Circuit and Its Application on EMI Filter

Electromagnetic interference (EMI) modeling and prediction are essential for the design of most power electronics apparatuses. This article aims at finding a fast method to select time step explicit solver-based simulation high frequency low loss (HFLL) circuits like EMI filter. The state-space model HFLL circuit is constructed its eigenvalues proved be very close imaginary axis. Both nondegenerate degenerate cases discussed. During analysis, lemma summarized on how transform into corresponding inversion coefficient matrix derived based Sherman-Morrison's formula. Then Laguerre-Samuelson's inequality employed find upper bound circuit's eigenvalues. process only requires two multiplications traces operation results, thus keeping computational complexity retaining in O(N 2 ). A typical filter equivalent including parasitic effects extracted from ANSYS. simulated application between dc/ac converter grid using fourth-order Runge-Kutta (RK4) solver with selected by proposed method. Numerical test shows that spectrum results those obtained experiment while being much more efficient than traditional methods, which demonstrates this time-step selection could benefit analysis time-domain circuits.