Sampled-Data Control With Adjustable Switching Frequency for DC-DC Converters

In this paper, a novel sampled-data control approach is proposed for dc-dc converters. The dc-dc power electronic converter is modeled as a sampled-data switched affine system according to the status of the power switch. A novel switching control algorithm is synthesized by using the switched Lyapunov theory. The proposed approach is able to not only drive the output to a prescribed set point from any initial condition, but also track a varying reference signal, and the switching frequency can be adjusted online with the guaranteed stability. In addition, with this approach, continuous conduction mode and discontinuous conduction mode operations can be treated in a unified way. The effectiveness and merits of the proposed method are illustrated by experiments on a laboratory prototype.