AUTHOR=Luo Zuohao , Wu Zaijun , Quan Xiangjun , Xie Xingfeng , Dou Xiaobo , Hu Qinran 

TITLE=Synchronous rectification of LLC resonant converters based on resonant inductor voltage

JOURNAL=Frontiers in Energy Research

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2023.1199397

DOI=10.3389/fenrg.2023.1199397

ISSN=2296-598X

ABSTRACT=<p>Synchronous rectification (SR) technology has been a critical technology for LLC converters to achieve high efficiency and power density. However, conventional SR driving methods face challenges in terms of light-load condition, module size, switching accuracy, and circuit complexity. This paper proposes an SR driving strategy based on resonant inductor voltage (RLV) to address those issues. This RLV-SR driving strategy does not require current sensors and is insensitive to rectifier parasitic parameters. In addition, the RLV-SR driving strategy can be applied in a relatively wide operating frequency range and load conditions. Experimental results based on a 100-W/24-V LLC converter are presented to verify the effectiveness of the proposed RLV-SR driving strategy. Furthermore, the error of turn-on time caused by stray inductance is significantly reduced compared with the conventional V<sub>DS-ON</sub> sensing method, which improves the power converter’s efficiency.</p>