Establishing the EMC Model of a Three-Terminal Voltage Regulator Based on Electrical Characteristic

The electromagnetic compatibility (EMC) will affect the normal operation of electromechanical systems and is an important indicator of the security and the stability. Three-terminal voltage regulators are widely used in various electromechanical systems, and modeling of three-terminal voltage regulators is of significance for EMC analysis of systems. However, there are some challenges in the modeling of three-terminal voltage regulators. In this paper, a modeling method of three-terminal voltage regulators based on electrical characteristic data, which can be used for establishing EMC model of a real physic object of voltage regulator conveniently, is proposed. Firstly, the electrical characteristic parameters of three-terminal voltage regulators are analyzed, and the experimental test methods of some parameters are given, which is useful for getting the needed data of modeling. Then, based on the data obtained through experimental tests and datasheets, a preliminary model is established using PSpice Model Editor. Finally, the final model is formed by adding external circuits to modify the preliminary model. The comparison of the simulated and experimental results shows that the model has satisfactory accuracy and the method is feasible. This method is very useful for future components modeling when doing EMC analysis and other circuit analysis.