This letter proposes a self-driven gate driver solely composed of passive components for synchronous rectification (SR). It utilizes the energy of the converter itself, automatically considers component tolerances and temperature variations of critical design parameters, and tunes the SRs on-time. Furthermore, no microcontroller, auxiliary power supply, or current-sensing/voltage-sensing components is required. A great amount of cost is therefore saved. The proposed gate driver is preferable to be used to some resonant converters operating as dc transformers. This letter presents its practical implementation in an LLC resonant converter. Experimental results illustrate that the body diodes’ conduction and reverse recovery are eliminated.

中文翻译：

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用于 LLC 同步整流的自驱动栅极驱动器

这封信提出了一种仅由用于同步整流 (SR) 的无源元件组成的自驱动栅极驱动器。它利用转换器本身的能量，自动考虑关键设计参数的组件容差和温度变化，并调整 SR 的导通时间。此外，不需要微控制器、辅助电源或电流感应/电压感应组件。因此节省了大量成本。建议的栅极驱动器更适合用于某些作为直流变压器工作的谐振转换器。这封信介绍了它在 LLC 谐振转换器中的实际实现。实验结果表明，消除了体二极管的导通和反向恢复。