Control structure optimization of a boost converter: an LQR approach

This paper investigates the interaction between the power stage and the controller of a boost converter and suggests a new method for simultaneously designing the power stage and controller. The controller is formulated as a linear quadratic regulator and the associated cost function is minimized through changes in the power stage parameters. It is found that better performance can be achieved than with a traditional two-step design process where the power stage and controller are designed sequentially. Optimization and simulation results for a boost converter are presented to illustrate the design process and benefits.