Analysis of positive output buck-boost topology with extended conversion ratio

Abstract

In this paper, a new non-isolated buck-boost converter with positive output is designed. This buck-boost converter contains two active switches which operates synchronously. Hence, the control circuit for the given converter is simple. Compared with the conventional buck-boost converter, the newly designed topology has few advantages such as positive output voltage and quadratic voltage gain. Due to the quadratic voltage gain, this converter can achieve wide voltage conversion ratios without the use of extreme (very low or high) duty ratios. The output voltage of this proposed converter is common ground with the input voltage and its polarity is positive. The continuous conduction mode operation (CCM) of the converter is deeply analyzed in steady state conditions. The necessary component design equations are also obtained along with the switching stresses. The MATLAB/Simulink software is used to design and simulate the proposed converter. The simulated results as well as the comparisons are provided to evaluate the effectiveness of the proposed buck-boost converter.