A New Approach in Optimal Control of Step-Down Converters Based on a Switch-State Controller

In this paper, an optimal approach based on on-off controller is used to optimally control a DC-DC step-down converter. It is shown that the conventional controller techniques of DC-DC converters based on a linearized averaging model have several drawbacks, including different operating mode, linearization concerns, and constraint difficulties. A single-mode discretize state-space model is used, and a new optimal approach policy is implemented to control a step-down DC-DC converter. The simulation results confirm that the proposed DC-DC model associated with the optimal controller functions properly in controlling a DC-DC unfixed switch-mode step-down converter that is facing load changes, noisy inputs, and start-up procedure.