Single-Inductor Multi-Output Converter using Event-Triggered MPC without Weighting Factor

Abstract

This paper presents a novel model predictive control (MPC) method for the single-inductor multi-output (SIMO) converter. The novel MPC method combines the conventional MPC strategy and the event-triggered control strategy, i.e. event-triggered MPC (ET-MPC). On one hand, the proposed ET-MPC method inherits the feature of fast dynamic response of MPC to reduce the cross regulation of SIMO converter; On the other hand, the MPC scheme is activated when the state of the SIMO converter triggers a preset triggering condition. Therefore, the unnecessary online computation and switching actions can be avoided, since the MPC scheme is suspended if the triggering condition is inactive. Consequently, the ET-MPC method has two advantages over the conventional MPC method: i) lower computational burden, ii) and less switching actions which contribute to lower switching losses. Moreover, the weighting factor for tuning the switching frequency can be deleted because the unnecessary switching action are all removed. The steady-state operation and dynamic performance cases are studied. The results demonstrate that PS-CRS is able to regulate the SI-MIMO DC-DC converter effectively and robustly.