Finite control set model predictive current control of the Coupled-Inductor Buck-Boost DC-DC Switching Converter

There are numerous studies that have proven the advantages of the coupled-inductor buck-boost dc-dc switching converter to manage the power in different hybrid system topologies. Features such as noninverting voltage step up and step down characteristic, wide-bandwidth, high efficiency, the ability to regulate the input or output currents with the facility to change current regulation loop between them in a sudden and smooth manner, among other benefits, have increased interest in this converter. However, until now it has only been reported an analog current control small-signal model that has been linearized about a quiescent operating point. In this article, model predictive control (MPC) by the coupled-inductor buckboost input current is presented with the goal of extend its operation point domain in comparison with the small-signal based regulator. The finite control set MPC (FCS-MPC) updates at every switching cycle the state which minimizes the cost function. This function simultaneously improves the current tracking and reduces the converter power losses. The theoretical analysis have been validated by means of simulations to illustrate the advantages of the proposed predictive control.