Time domain simulation of power electronics circuits using embedded companion models

This paper presents a stepwise time-domain simulation technique for analysis of power electronics circuits. New companion models embedding with parasitic resistance of reactive elements and switches are proposed. In every simulation step, a switching circuit is transformed into a resistive network, which is analyzed by a modified nodal approach. The switch model enables a switching circuit to be modeled by a constant system matrix, regardless of the switching state. This feature allows a circuit with numerous topologies to be modeled elegantly by one set of algebraic equation, and a reduction of circuit formulation and computation time. By using quadratic extrapolation on circuit waveforms within a simulation step, a simple and direct method is used to determine switching instants. Simulated results are verified with experimental measurements.