Parametric identification algorithm based on frequency response for compensators optimization

The compensator design is closely related to the transient response achieved by the closed loop converter. So, the representation of the aforementioned transient response while designing the compensator is a powerful optimization tool. However, in order to represent the transient response, the small signal model of the power stage must be completely characterized. When the power stage is not determined analytically, it can be obtained by means of a direct measurement on the converter, the first step must be the parametric identification of the converter transfer function from the measured frequency response. Along the present paper, a simple fitting algorithm for parametric identification of the frequency response is proposed. Initial solution for the identification algorithm is another key point for an accurate parametric identification of the power stage. Therefore, easy rules for direct identification of the initial solution are also provided. Finally, experimental validation on an actual converter is included.