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Optimal Trajectory Control of LLC Resonant Converters for Soft Start-up

Fig. 1. Initial condition settling with different control approaches.
An optimal soft start-up process for the LLC resonant converter is proposed based on the graphical state-plane analysis. To settle the initial condition, the unsymmetrical-band approach, slop-band control, and two-pulse control are investigated as shown in Fig.1.

An optimal soft start-up process for the LLC resonant converter is proposed based on the graphical state-plane analysis. To settle the initial condition, the unsymmetrical-band approach, slop-band control, and two-pulse control are investigated as shown in Fig.1.


Fig. 2. Optimal trajectory control in the current limitation band.
Fig. 3. Experimental result of proposed optimal soft start-up.
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