Optimal state-space controller for power switching converter

This paper describes the state-space controller for the buck converter working in Continuous Conduction Mode (CCM). The converter operates at a switching frequency of 500 KHz. Aiming to study the control of this kind of converter, some classical control techniques and the control in the state space are discussed. As an example, we present the design procedure for a dc-dc buck converter with an analog controller in s-domain, and a linear quadratic regulator (LQR). The controller is robust to the load variation and the change in supply and reference voltage. The performance of the controllers is compared and conclusions are drawn. Matlab/Simulink simulated results illustrate that the control system has good static and dynamic characteristics.