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LLC Resonant Converter Burst Mode Control with Constant Burst Time and Optimal Switching Pattern

Fig. 1. Control block of proposed burst mode.
A novel LLC resonant converter burst mode control with constant burst time and optimal switching pattern is proposed for the highest light load efficiency. Three pulse switching pattern is applied during burst time. Moreover, the first pulse width is optimized to settle the steady-state under the highest efficiency load condition in one pulse. Zero current detection (ZCD) of resonant current is implemented to achieve first switch partial ZVS, further increasing light load efficiency.

Fig. 2. Trajectory of proposed burst mode.
Fig. 3. Burst waveform when light load is 1A.
Fig. 4. Efficiency improvement with proposed burst mode.
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