Period Control Approach Finite Control Set Model Predictive Control Switching Phase Control for Interleaved DC/DC Converters

The control of interleaved converters is commonly implemented through pulsewith modulation (PWM) techniques. A common element in these implementations is the use of phase shift between carriers to improve the system performance. When working with a balanced system, this phase shift is equally distributed between modules, but for an unbalanced system, this is no longer the best alternative. Changing the phase shift in these controllers requires the implementation of new capabilities in the control platforms, and for the controller to manage more variables of different nature. On the other hand, finite control set model predictive control (FCS-MPC) has shown to be a promising control strategy, especially when managing multiple control objectives of different natures or dynamics. In general, FCS-MPC does not present a fixed switching pattern, but this issue has been recently addressed with the so called period control approach (PCA). This article expands on the PCA-FCS-MPC to achieve the switching phase regulation for interleaved dc/dc power converters. A switching pattern similar to that of PWM techniques is achieved, while keeping the advantages of FCS-MPC and achieving the phase shift required for interleaved operation. Simulation and experimental results confirm the effectiveness of the proposed method.