Optimal Trajectory Control of LLC Resonant Converter for Soft Start-Up
In this invention, the optimal control of LLC resonant converter for the soft start-up is proposed. Several control approaches are invented to settle the initial condition at the start-up moment based on the state-trajectory analysis. During the soft start-up process, the current limitation band is set. The optimal frequency is determined with the current band by graphic analysis. Meanwhile, the physical switching instant could also be detected by sensing the resonant converter. As a result, there is no current and voltage stress in the resonant tank during the soft start-up.
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