Hello, recently I have been using the small-signal analysis feature of PLECS to verify the closed-loop output impedance of the full-bridge converter. The phase-frequency curve in the low-frequency range of its Bode diagram shows distortion and cannot match the theoretical derived phase-frequency curve. What are the reasons for this situation?
Can you post a model for discussion? What analysis method in PLECS are you using? Does the theoretical function make certain assumptions?