Digital Synchronous Rectification Control Method for High-Frequency Resonant Converters Under Overload Current Limiting Conditions

NING Yuhang; BAI Xiaoqing; WANG Kangping; ZHAO Ruochen; WEI Gaohao

doi:10.7652/xjtuxb202603017

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Digital Synchronous Rectification Control Method for High-Frequency Resonant Converters Under Overload Current Limiting Conditions

更新时间：2026-03-09

- Digital Synchronous Rectification Control Method for High-Frequency Resonant Converters Under Overload Current Limiting Conditions
- Journal of Xi'an Jiaotong University Vol. 60, Issue 3, Pages: 175-186(2026)
- 作者机构：
  
  西安交通大学电气工程学院，710049，西安
  西安爱科赛博电气股份有限公司，710119，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202603017
  CLC： TM46
- Received：16 April 2025，
  
  Published：10 March 2026
- 稿件说明：
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NING Yuhang, BAI Xiaoqing, WANG Kangping, et al. Digital Synchronous Rectification Control Method for High-Frequency Resonant Converters Under Overload Current Limiting Conditions[J]. Journal of Xi'an Jiaotong University, 2026, 60(3): 175-186.
DOI：

NING Yuhang, BAI Xiaoqing, WANG Kangping, et al. Digital Synchronous Rectification Control Method for High-Frequency Resonant Converters Under Overload Current Limiting Conditions[J]. Journal of Xi'an Jiaotong University, 2026, 60(3): 175-186. DOI： 10.7652/xjtuxb202603017.

摘要

针对LLC谐振变换器在过载限流工况下因频率提高导致原、副边出现相移，进而造成同步整流控制困难的问题，提出一种基于数字控制的同步整流控制方法。构建了LLC变换器在过载限流工况下的等效模型，分析相移产生机理，并揭示了相移与输出电压及开关频率的关系；应用简化最优轨迹控制方法，结合状态轨迹图分析得到不同输出电压下相移特性曲线的拟合关系式；在控制器中预置相移角以有效降低运算复杂度，仅利用电压反馈信号即可实现同步整流的相移补偿，生成准确的同步整流控制信号，无需附加检测及控制电路。搭建了输入电压为270 V、输出电压为28V的半桥LLC变换器实验样机，在350～900 kHz频率范围内进行限流值为50A的过载限流实验。实验结果表明：所提出的相移补偿方法能够有效跟踪相移变化，在稳态与瞬态过程中均实现了同步整流的准确控制；所提出的数字同步整流控制方法在宽频率范围内具有良好的适应性，可有效抑制因相移引起的同步整流误动作，显著提升变换器在过载限流工况下的运行可靠性。

Abstract

To address the phase shift between primary and secondary sides caused by frequency elevation in LLC resonant converters under overload current limiting conditions

which complicates synchronous rectification control

this study proposes a digital synchronous rectification control method.An equivalent model of the LLC converter under overload currentlimiting conditions is established to analyze the phase shift generation mechanism and reveal the relationship between phase shift

output voltage

and switching frequency.By applying a simplified optimal trajectory control approach and analyzing state trajectory diagrams

fitting equations for phase shift characteristics under varying output voltages are derived.A phase shift angle is preset in the controller to reduce computational complexity.Only voltage feedback signals are required to achieve phase shift compensation for synchronous rectification

generating accurate control signals without additional detection or control circuits.A half-bridge LLC converter prototype with 270 V input voltage and 28 V output voltage is built for overload current-limiting experiments with a 50 A current limit across a 350—900 kHz frequency range. The experimental results demonstrate that the proposed phase shift compensation method effectively tracks phase shift variations

achieving precise synchronous rectification control in both steady-state and transient processes.The proposed digital synchronous rectification control method exhibits strong adaptability across wide frequency ranges and effectively suppresses malfunctions caused by phase shifts

significantly enhancing the operational reliability of the converter under overload current limiting conditions.

关键词

Keywords

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Related Author

NING Yuhang

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Related Institution

School of Electrical Engineering, Xi’an Jiaotong University

西安爱科赛博电气股份有限公司

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