An Improved Modulation Strategy for a Four-Switch Buck-Boost Converter with Reduced Current Ripple

The Four-Switch Buck-Boost converter (FSBB) or Non-Inverting Buck-Boost (NIBB) is a widely used converter due to its bidirectionality and the capability to work with a wide range of input and output voltages. This converter can be used for battery charges, photovoltaic applications, and smart grids. Several papers present different strategies to reduce the average current through the inductor to improve the converter's efficiency.This paper aims to reduce the current ripple through the inductor to minimize the power losses in the core. Firstly, the current modulator presented in the state of the art will be analyzed. Then some modifications will be suggested, and the modulators will be analytically compared. Finally, both modulations will be implemented and tested.