PBC for direct voltage regulation for the boost DC–DC converter

Abstract

Passivity-based control (PBC) for a power converter is an interesting alternative to the conventional linear control technique. In general, the objective of PBC is to reshape the energy of a system, additionally damping the system to modify the dissipation structure. PBC forces the closed-loop dynamics to behave in a manner such that the virtual damping resistances injected in the system are in series or parallel of the actual physical circuit elements. The boost converter is intrinsically non-linear, non-minimum phase system at the output with respect to the control input. Control techniques such as the PBC that requires some form of system inversion cannot be implemented. By using the one-to-one correspondence between the inductor current and the output voltage at the equilibrium point, conventional non-linear control techniques exploit regulation of the inductor current to regulate the output voltage (indirect regulation). This study proposes passivity-based direct output voltage regulation for a boost converter, which has multiple advantages over other non-linear control techniques and the conventional linear controller.