An$H_infty $Control Strategy for Switching Converters in Sliding-Mode Current Control

The design of a two-loop control for nonminimum phase-switching converters is presented in this letter. An internal sliding-mode control loop forces the converter inductor current to follow the reference established by
$H_infty $
control of the output voltage in an outer loop. Simulations of both time and frequency responses of the output voltage show a faster and more robust behavior than in the case of a conventional approach using a PI controller in the external loop. Experimental results are in good agreement with the simulation predictions.