A time-domain stability analysis method for paralleled LLC resonant converter system based on Floquet theory

摘要

In this paper, a stability analysis method based on Floquet theory is firstly proposed to provide an effective stability analysis method for paralleled LLC resonant converter system. Firstly, the time-domain model of a paralleled LLC resonant converter system is established, then, the stable range of the paralleled LLC resonant converter system can be determined by analysing the eigenvalues of the state transfer matrix based on Floquet theory, which is obtained from the established time-domain model. Finally, a two-stage paralleled LLC resonant converter system controlled by average current mode is taken as an example, the correctness and effectiveness of the proposed stability analysis method based on Floquet Theory is verified by simulation. The proposed stability analysis method can avoid the complex derivation of transfer function and impedance in frequency domain analysis methods.