Fast waveform and EMI calculation of a PFC converter

Waveforms of switched mode converters are usually determined by simulation in the time domain. In particular, off-line converters, which change duty cycle and/or switching frequency cyclically, do not allow the calculation of the behavior by assuming an average operating point, representative for all time instances during a mains cycle. This leads to the necessity to simulate a time span, which covers at least one mains cycle. On the other hand, time domain simulations by circuit simulators need small integration steps to achieve numerical stability, especially when the switching frequency of the converter is high. The result is a long simulation time. This paper describes an efficient method, producing complex converter waveforms by using template functions. In addition to current and voltage waveforms a fast estimation of the EMI level is produced. Measurements show the validity