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Simplified Optimal Trajectory Control (SOTC) for LLC Resonant Converters

Fig. 1. SOTC during load step-up.
This paper proposes a simplified optimal trajectory control (SOTC) for LLC resonant converters. During the steady state, a linear compensator like PI or PID is used, controlling the switching frequency (fs) to eliminate error. However, during load transients, the simplified optimal trajectory control (SOTC) method takes over, controlling the pulse widths of the driving signals. Using state-plane analysis, the pulse widths are estimated, letting the state variables track the optimum trajectory locus in the minimum period of time.

Fig. 2. SOTC during load step-down.
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