A Novel Buck-Boost Converter With Low Electric Stress on Components

In this paper, a novel buck-boost converter with low electric stress on components and negative output voltage is proposed. The operational principle, steady-state analysis, and small-signal modeling of the proposed buck-boost converter in continuous conduction mode are presented. Comparisons among another five buck-boost converters and the proposed buck-boost converter are presented. It is found that the proposed converter's voltage gain is smaller than the other converters' in step-down mode. Also, based upon the comparisons among the same kind and same number of components, the voltage and current stresses on the power switch of the proposed buck-boost converter are less than or equal to those of the comparative converters, and the voltage stress on the charge pump capacitor and the switching device power rating of the proposed buck-boost converter are always lower than those of other comparative converters. The efficiency of the proposed buck-boost converter is highest among those converters having the same number of elements. These advantages make component selection for the proposed converter much easier, and it can be used directly in applications needing a negative voltage source. Finally, simulation results and circuit experiments are given for validating the effectiveness of the proposed buck-boost converter.