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Standard SPICE engines were designed for analog integrated circuits where signals change smoothly. Power electronics, however, are defined by . A MOSFET or IGBT turns on and off in nanoseconds. To simulate this accurately, the solver must take incredibly small time steps to capture the switching transient. If the time step is too large, the solver fails (convergence errors); if it is too small, the simulation takes forever.

The transition toward an electrified future—characterized by electric vehicles (EVs), renewable energy integration, and smart grids—has elevated power electronics from a niche engineering discipline to the cornerstone of modern technology. As the complexity of these systems grows, the traditional "build and test" methodology has become prohibitively expensive and time-consuming. Enter SPICE (Simulation Program with Integrated Circuit Emphasis).

Transformers and inductors in power systems are not ideal. A robust SPICE guide will explain how to include: