Transient computation of DC-DC converters using a new envelope following method

A new envelope following algorithm, using both exponential and quadratic approximations of the envelope, is proposed. Using the most appropriate approximation for each state variable, this algorithm switches automatically between the methods of approximation. A new criterion for the efficiency of an envelope following analysis is proposed. In the case of two buck converters this analysis shortens the simulation time jumping over some switch signal periods and reaching finally the same steady state as the usual transient analysis. The proposed algorithm proves to be in this case the most efficient, followed by the algorithm implemented in SPECTRE RF and the algorithm implemented in PAN. This efficiency hierarchy is the same for all analyzed cases.