Sensorless flatness based control for a boost converter

In this paper, a sensorless flatness based controller with nonlinear observer for non-ideal boost converter is proposed. Losses are modeled with a voltage source series with input and a current source parallel to output. By a one-loop control structure with flatness property, both output voltage and inductor current is regulated. But, flatness based control is a model based method and requires extra sensors for obtaining data of all system parameters. For reducing numbers of sensors, a nonlinear observer is used to estimate output current and input voltage. So, sensors of these two parameters are eliminated. Simulation and experimental results are given to validate the proposed controller and robustness of proposed controller to variation of system parameters is obvious. In addition, simulation results of proposed controller are compared with a two-loop controller including PI and energy control