Comparison of several modulation strategies for the Four Switch Buck-Boost converter

The Four Switch Buck-Boost converter (FSBB) is a widely used topology for DC-DC applications in which isolation is not required. This is mainly due to its bidirectionality, and the ability to operate under a wide range of input and output voltages. There are several modulation strategies for this converter, each one with its strengths and weaknesses.In this paper, several modulators from state of the art are compared, and the losses of the transistors and the inductor are computed. With this information, it is intended to select the best modulator depending on the input and output voltages, output power, and hardware limitations of the designed FSBB.