Robust Digital Two-Loop Controller Design for Two Inductor Boost DC-DC Converter

摘要

A quantitative feedback theory based systematic design procedure is proposed for two-inductor boost dc-dc converter. The two-loop design proposed in this paper is effective in handling the uncertainties, both in model as well as in converter parameters. Compatible models are formulated, in discrete-time domain, to achieve this task. Minimum stability margin is enforced so as to keep the system within the stability region even under extreme operating conditions. Firstly, the robustness features of the two-loop controller is analyzed through computer simulations and then compared with time-domain responses. The analytical concepts are then verified experimentally on a 28 V, 30 W laboratory prototype system. Experimental results are in line with the analytical design studies.