A Sliding Mode Control Strategy with Discrete Pulse Frequency Modulation for CLLC DC-DC Converter

A sliding mode control (SMC) strategy with discrete pulse frequency modulation is applied for CLLC resonant converter and the sliding surface is designed to be easy to realize by hardware circuit. The method of input-output linearization is introduced to design SMC controller to guarantee the robustness and improve the dynamic performances. The theoretical analysis and the dynamic performances are verified by the simulation. The simulation results show that the control strategy has a strong robustness and a quick dynamic response. And the chattering caused by SMC controller is small.