Discrete-Time Sliding Mode Controlled Synchronous DC-DC Buck Converter

فاقد چكيده فارسي

This paper proposed a new design of digital sliding mode control for synchronous DC–DC buck converter. In presented control law, disturbance item is considered in the dynamic equation of the synchronous buck converter to achieve fast transient response and high robustness under load and line variations. Also, stability analysis of proposed digital sliding mode control is presented. In fact, we design a control law that closed-loop system has strong robustness to uncertainties as it reduced chattering, steady state error, overshoot and undershoot of output voltage. The simulation results is obtained using the MATLAB/SIMULINK software. Simulation results show that the proposed control law exhibits considerable reduction in terms of the chattering, and overshoot and undershoot of output voltage response during immediate load and line voltage variations. The proposed method reduces the chattering to about 1.1%. Also, the overshoot and undershoot values are 1.3% and 1.8%, respectively. Also, when the input voltage is changed to 26% of its value, there is almost no overshoot and undershoot. The selected synchronous buck converter in this paper has an input voltage of 38V and an output voltage of 5V and a 10W output power.