A New Single-Input Dual-Output DC-DC Converter Modelled Using Small-Signal AC Approach for Micro-Grid Applications

In this paper, a new structure of a non-isolated Single-Input Dual-Output (SIDO) DC-DC converter suitable to medium voltage applications is proposed. This structure is based on a Buck-Boost converter stage associated with Two Output Stages (BBTOS) composed, in addition, by a power switch and a power diode. The new structure of the SIDO Buck-Boost converter is providing two outputs and presents several appealing advantages, in particular a reduced number of power devices and the ability to step-up and step-down the output voltage. In this work the principle of the operating mode and the control strategy of the proposed structure are described (Multi-Input Multi-Output (MIMO) controller). A thorough ac small signal study of the SIDO Buck-Boost converter is also introduced. In addition, the simulation results under MATLAB/SIMULINK environment with different load conditions and voltage input are presented. The benefits and limits of the suggested SIDO Buck-Boost converter are also discussed.