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Synchronous Rectification for LLC Resonant Converter: An Overview
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2020-11-25 , DOI: 10.1109/tpel.2020.3040603
Yuqi Wei , Quanming Luo , H. Alan Mantooth

LLC resonant converter is one of the most popular isolated dc/dc converters owning to its advantages of simple control, wide voltage gain regulation capability, and soft switching operation. Nevertheless, high efficiency and high power density are always the goals for LLC converters. To further increase the conversion efficiency, the synchronous rectification (SR) technology is adopted, where the uncontrolled diodes on the secondary side are replaced with SR MOSFETs. Due to the extreme low on -state resistance value for SR MOSFET, considerable secondary rectifier conduction loss reduction can be achieved; thus, the system efficiency is improved. Tremendous SR driving strategies for LLC converter have been proposed. However, comprehensive overview and insight comparisons among these different driving strategies are lacking. Therefore, the main purpose of this article is to present a comprehensive overview for SR driving strategies and answer the following four questions: 1) Why is SR important for LLC converter? 2) How to generate the SR MOSFET driving signal? 3) What are the advantages and disadvantages? 4) What is the future work regarding SR driving strategy?

中文翻译:

LLC谐振转换器的同步整流:概述

LLC谐振转换器是最流行的隔离式DC / DC转换器之一,它具有控制简单,宽电压增益调节能力和软开关操作的优点。尽管如此,高效率和高功率密度始终是LLC转换器的目标。为了进一步提高转换效率,采用了同步整流(SR)技术,其中次级侧上不受控制的二极管被SR MOSFET取代。由于极低 SR MOSFET的状态电阻值,可实现相当大的次级整流器导通损耗降低;因此,提高了系统效率。已经提出了LLC转换器的大量SR驱动策略。但是,这些不同的驾驶策略之间缺乏全面的概述和见解比较。因此,本文的主要目的是对SR驱动策略进行全面概述并回答以下四个问题:1)SR为什么对于LLC转换器很重要?2)如何产生SR MOSFET驱动信号?3)优缺点有哪些?4)关于SR驱动策略的未来工作是什么?
更新日期:2020-11-25
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