Robust current assisted H∞ controller for boost converter in the presence of uncertainty and evaluation using μ-analysis

A novel current assisted H_infin controller for boost converter is presented in this paper. The proposed controller combines the H_infin robust stabilization technique and classical loop-shaping. The current loop of the boost converter is closed with constant gain and then, the H_infin controller is estimated and applied to the converter, closing the voltage loop. The derived controller has been compared to the popular peak current mode controller in terms of robust stabilization and performance using the concept of uncertainty and the powerful tool of mu-analysis. To verify the theoretical analysis and conclusions, the two control schemes have been simulated under nominal and disturbed conditions considering step load and reference changes.