Fast Transient State Trajectory Control for Switched-Capacitor-Based Resonant Converter

This article presents a state trajectory control scheme for a switched-capacitor-based resonant converter consisting of two half-bridge circuits with four switches. The proposed technique can not only bring an improved dynamic response of output voltage regulation but also ensure that the converter benefits from soft-switching operation. The analysis in the two state planes provides insight into the switching modes of the converter and creates an accurate behavior framework in the geometrical domain. As a result, a finite-state-machine controller is designed based on the planning of the state trajectories. The switching conditions are exploited to obtain fast start-up and step-load transient responses. The proposed control method is verified with experimental results of a 14.5-V, 5.8-A converter prototype.