Robust control of the DC-DC Ćuk converter in discontinuous conduction mode

In this paper a robust sliding mode controller is designed for DC-DC Ćuk converter. Sliding surface of the controller includes all of the system state variables. Hence, proposed controller has four-loop structure. Reference values of the state variables are calculated according to output voltage references using feedforward and feedback control loops. Designed controller can regulate output voltage of the converter in both continues and discontinues conduction modes in a wide range of the load and line variations. The accuracy and effectiveness of the proposed control approach is verified in some tests using MATLAB/Simulink software.