Comparative study of simulation algorithm for switching converter

This paper presents a comparative study of frequency analysis algorithms, i.e., State-Space Averaging Method (SSAM) and Fourier Transform Method (FTM) for switching converters. These two methods are reviewed briefly and a circuit simulator is implemented and demonstrated with several circuits, for example, a buck converter as a simple-structured circuit, a tapped-inductor converter as a resonant circuit, and a hysteretic circuit as a self-oscillation circuit. From the results, we can see that both methods can analyze almost all of the circuits. However, SSAM cannot obtain correct results for some of them, for example, resonant circuit and hysteretic circuit. Whether correct results are obtained or not depends on circuit topology. To make use of rapidness of SSAM, a procedure to use SSAM with help of FTM is described.