Selection criteria of closed-loop controllers for DC-DC voltage regulators based on nominal and tolerance design: Monte Carlo and interval arithmetic based optimization

A novel method to select optimal feedback compensation networks for DC-DC switching converters is presented in this paper. This method provides a support to robust design, allowing the optimal solution choice among different projects that fulfil given constraints. The considered case of study concerns the optimization of the feedback control circuit of a voltage-mode regulated DC-DC converter. Given control loop performance constraints and the circuit parameters commercial values and tolerances, six different approaches are adopted to select a set of optimal feasible design solutions. Indeed, they have been found by means of a numerical method based on Monte-Carlo technique. Interval arithmetic is used to make computations with tolerances. The results presented in this paper highlight that, given a set of design constraints, the best projects are identified by means of a comparative evaluation of the robustness of the different possible design solution with respect to parameters tolerance.