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<p>Although the conventional adaptive synchronous rectification (SR) control strategy can dynamically regulate the duty cycles of SR switches according to load variations, its relatively sluggish adjustment dynamics under load transients often result in delayed responses, causing efficiency loss and current spikes. To address this issue, this paper proposes an optimized adaptive SR control strategy, with the CLLLC resonant converter as the research object, with the aim of improving the underutilization of the secondary-side switching MOSFETs during rectification. The strategy first calculates the required conduction time of the real cycle switching MOSFET. Subsequently, leveraging the SR method based on drain-source voltage sensing and considering the impact of parasitic parameters, the conduction time adjustment is converted into a corresponding adjustment of the turn-off threshold voltage (V<sub>th2</sub>​). Simulation and experimental results verify that the proposed SR control strategy effectively accelerates the adaptive SR adjustment speed and greatly enhances the rectification efficiency.</p>

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Optimized control of adaptive synchronous rectification for CLLLC resonant converters

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Xingtian Feng,
  • Rundong Zhang,
  • Hejie Qiu

摘要

Although the conventional adaptive synchronous rectification (SR) control strategy can dynamically regulate the duty cycles of SR switches according to load variations, its relatively sluggish adjustment dynamics under load transients often result in delayed responses, causing efficiency loss and current spikes. To address this issue, this paper proposes an optimized adaptive SR control strategy, with the CLLLC resonant converter as the research object, with the aim of improving the underutilization of the secondary-side switching MOSFETs during rectification. The strategy first calculates the required conduction time of the real cycle switching MOSFET. Subsequently, leveraging the SR method based on drain-source voltage sensing and considering the impact of parasitic parameters, the conduction time adjustment is converted into a corresponding adjustment of the turn-off threshold voltage (Vth2​). Simulation and experimental results verify that the proposed SR control strategy effectively accelerates the adaptive SR adjustment speed and greatly enhances the rectification efficiency.