PCL sliding mode controller design for buck converter under large disturbances

On the basis of Prescribed Convergence Law(PCL) algorithm, this paper presents a robust sliding mode controller for the DC-DC converter in the pure electric vehicle in order to improve the rapidity and robustness under large disturbances.Taking Buck converter as an example, this paper verifies the convergence of the sliding mode algorithm in finite time, and compares it with PI and the traditional sliding mode control. The simulation results and their analysis show preliminarily that:① without disturbances PCL control has high steady state accuracy, short regulation time, and small output ripple, ② under large disturbances in the input voltage and output load, PCL control shows faster response and stronger robustness.