Abstract
This article discusses the design and evaluation of secondary power sources using simulation models. In a set of circuit experiments, the models allow various parameters to be measured and visualized and aid in the analysis of the results. The models were developed using "NI MultiSim" (for simulation experiments); "Micro-Cap" (for functional experiments) and "LTspise" (for process control). Simulation helps to understand the basic concepts, analysis and tuning of circuit processes and parameters of secondary power supplies.