Two-loop adaptive and nonlinear control of the DC-DC boost converter in Discontinuous Conduction Mode

In this paper, an adaptive nonlinear controller is designed for DC-DC boost converter in Discontinuous Conduction Mode. The proposed controller is developed based on input-output linearization using an adaptive backstepping approach. All of the converter parameters, input voltage, load resistance and other parasitic elements are estimated using a suitable Lyapunov function. Because of non-minimum phase nature of boost converter, double-loop control structure is used. In this method, output voltage of the converter is indirectly controlled by tracking the inductor current. The inductor reference current is generated by a variable structure-PI controller which regulates the converter output voltage. The proposed controller is capable of operating in a wide range of reference voltage, load resistance and input voltage ripple. Using MATLAB/Simulink toolbox, some simulation is presented to verify the capability and effectiveness of the proposed control approach.