An Accurate Dynamic Characteristics Design Method for Boost Converter with PI Control Based on Motion Decomposition and Eigenvalue Configuration

Bode diagram is always used for qualitatively judging the dynamic characteristics in DC-DC converters. However, there is lack of a quantitative dynamic characteristics design method to determine the settling time and overshoot of a DC-DC converter in engineering applications. In this paper, firstly, the dynamic model of Boost converter is established by period averaging and small-signal linearization modeling. After that, the dynamic characteristics of the Boost converter is accurately represented by the eigenvalues of the closed-loop system through motion decomposition. Then, the eigenvalues region of the closed-loop system that satisfies the expected dynamic characteristics of the Boost converter is analyzed. Furthermore, the PI parameters that conFigure the eigenvalues of the closed-loop system to satisfy the corresponding dynamic characteristics area are calculated by the eigenvalue configuration. Finally, the effectiveness of the proposed dynamic characteristics design method is verified by PSIM simulation and experiment. The proposed method provides a reference for the dynamic characteristics design of the Boost converter.