Non-linear average electrothermal models of buck and boost converters for SPICE

The new method of formulating non-linear average electrothermal models of dc–dc converters is presented in the paper. These models take into account both: non-linearity of diode and transistor characteristics and electrical inertia of these elements. The form of the models for buck and boost converters is presented and their correctness is verified by comparing the characteristics of the considered converters obtained with the proposed model and the classic transient analysis.