Research on the Control Strategy of LLC Resonant Converter Based on Sliding-Mode Self-Anti-Disturbance Control

LLC resonant converter is widely used in various industrial power supply and new energy generation fields because of its simple structure, easy soft switching and strong load adaptability. In this paper, we propose the application of the sliding mode self-turbulence control technology to the LLC resonant converter for the problem of excessive fluctuation and long regulation time when the LLC resonant converter encounters sudden load change under the traditional control strategy. The LLC resonant converter is mathematically modeled using the extended descriptive function method to obtain the LLC resonant converter transfer function. Based on the linear self-anti-disturbance control, the sliding-mode control is introduced as the control rate, and the steady-state and dynamic characteristics of the LLC resonant converter under different control strategies are compared and analyzed by simulation. The simulation results show that the sliding-mode self-anti-disturbance control has good performance in improving the response speed and anti-disturbance capability of the LLC resonant converter.