Indirect output voltage regulation of DC-DC boost converter with accurate parameter estimation

A DC/DC boost converter exhibits highly nonlinear properties and subjects to certain uncertainties, like load change, input voltage variation, and parametric uncertainties. This paper first presents an improved accurate model of the converters, including the parasitic elements and model uncertainties, which are usually existed in actual systems but not (or not sufficiently) considered in most of the literatures. In view of the non-minimum phase nature of boost converter, a new indirect control scheme is proposed, in which the output voltage is indirectly controlled by tracking a corresponding inductor reference current. An integrated direct/indirect adaptive robust controller (DIARC) is presented to achieve both accurate parameter estimation and perfect current tracking in the presence of both parametric uncertainties and uncertain nonlinearities. With an accurate parameter estimation, the corresponding inductor reference current can be precisely calculated. A rigorous theoretical proving is given and simulation results shows the effectiveness of the proposed controller and control scheme.