Design and evaluation of robust controller for AC-to-DC Boost converter

In this paper, the problem of controlling AC/DC full bridge converter is considered. The control objectives are twofold: (i) guaranteeing a regulated voltage for the connected load, (ii) enforcing power factor correction (PFC) with input current sinusoidal. The considered problem is dealt with using a nonlinear controller that involves two loops in cascade. The inner loop is designed, using sliding mode approach and hysteresis approach, to cope with the PFC issue. The outer-loop is designed to regulate the converter output voltage. Issues in the design and implementation of controllers for a boost converter using linear and nonlinear control methods are investigated. Thus comparison of the effects of the PID control with hysteresis and SMC on the AC/DC Boost converter response in steady state, under line variations and load variations are performed. Simulation results using Matlab/Simulink shows the effectiveness of sliding mode control over other controllers.