Time-Scale Separation Redesign for Performance Recovery of Boost Converters, a New Approach

The common practice for obtaining a regulated output voltage from a dc-dc boost converter has the disadvantage of insufficient robustness against additive noise uncertainties. The present study is devoted to search for a technique to improve the robustness of the boost converters with input noise uncertainties. The nonlinear Current-Mode Control (CMC) is used to regulate the output voltage of the dc-dc boost converter. The new approach uses the Two-Time-Scale Separation based robust redesign technique to increase the robustness of the converters against input noise uncertainties. A uniform additive noise having amplitude of -0.3 to 0.3 V imposed to the system's input source and the performance of the output regulation was evaluated and compared to the system without any noise. The load uncertainty was also added and output was evaluated. In the last stage load uncertainty was replaced by line voltage uncertainty. The results show that in spite of imparting noise and other uncertainties, the proposed system can recover the nominal trajectories in a satisfactory manner. The study also indicated that by increasing the filter gain, redesigned system performance improved. System output with time scale design for epsilon=0.001 is superior to other systems tested.