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Optimal Trajectory Control of Burst Mode for LLC Resonant Converter

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. A three pulse switching pattern is applied during burst time. 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 the resonant current is implemented to achieve a first switch partial ZVS, further increasing the light load efficiency.


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