Stabilizing the Nonlinear Dynamic Behavior of LLC Resonance Full-Bridge DC-DC Converter Under Voltage Mode Control

Abstract

In this paper, a simple control method is presented to stabilize the nonlinear dynamic behavior of LLC resonance full-bridge DC-DC converter under voltage mode control based on the conventional delay time feedback, resonant parametric perturbation and self-stable control methods. First, the mathematical model of LLC resonance full-bridge DC-DC converter under voltage mode control are built. Second, the dynamic behaviors of the system is analyzed and the system is lost stability by border collision and Neimark-Saker bifurcation. Finally, the simple controller is introduced by sampling the primary inductor current of the transformer, and then the simulation results show that the dynamic behaviors can be stabilized by this controller.

Estimation of the bifurcation point of a modulated‐hysteresis current‐controlled DC–DC boost converter: stability analysis and experimental verification

“…These types of bifurcation, which are called smooth bifurcations, do not involve structural changes in the system. Other instabilities, which are called border collision or non‐smooth bifurcations, can be exhibited because of a structural change [13, 16, 23].…”