Partition Border Tuning and Chattering Mitigation for DC–DC Series Resonant Converters: A Stability‐Oriented Approach

Typical resonant converter controllers are based on linearised averaged models, which have significant modelling errors when there are wide fluctuations in the input voltage, load and reference voltages. In this article, a piecewise affine (PWA) switching surface with active border tuning of affine sections, called the Partition Border Tuning (PBT) controller, is proposed for DC–DC series resonant converters (SRCs). Lyapunov stability analysis is used to ensure closed‐loop stability. A new Chattering Mitigation (CM) technique is proposed to suppress unwanted oscillations between modes and output voltage overshoot under transient conditions, which are generally present in conventional switching surface controllers. This technique eliminates chattering, reduces output voltage overshoot and limits the maximum inductor current and capacitor voltage amplitude of the resonant tank under transient conditions. Simulation and experimental data are presented to demonstrate the effectiveness of the proposed approach.