Digital synchronous rectification control method for high frequency LLC converter under overload current limiting condition

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

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Digital synchronous rectification control method for high frequency LLC converter under overload current limiting condition

更新时间：2026-01-02

- Digital synchronous rectification control method for high frequency LLC converter under overload current limiting condition
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2026)
- 作者机构：
  
  1.西安交通大学电气工程学院,陕西省西安市710049
  2.西安爱科赛博电气股份有限公司,陕西省西安市,中国
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM46
- Received：16 April 2025，
  
  Revised：2025-08-28，
  
  Accepted：27 November 2025，
- 稿件说明：
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NING Yuhang, BAI Xiaoqing, WANG Kangping, et al. Digital synchronous rectification control method for high frequency LLC converter under overload current limiting condition[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026.
DOI：

NING Yuhang, BAI Xiaoqing, WANG Kangping, et al. Digital synchronous rectification control method for high frequency LLC converter under overload current limiting condition[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026. DOI：

摘要

同步整流技术在低压大电流输出的应用中可以显著降低损耗，提高变换器的效率。在LLC变换器的过载限流工况下，大幅提高LLC变换器开关频率可降低输出电压从而限制输出电流，但该种方法LLC变换器的原副边之间会产生相移，使得同步整流的开通与关断时刻难以准确控制。为解决相移带来的控制难题，本文提出了一种针对高频LLC变换器在过载限流工况下的数字同步整流控制方法，应用简化最优轨迹控制方法，通过状态轨迹图得到不同输出电压下的相移曲线，并通过拟合相移曲线有效降低了数字控制器的运算量。该方法无需额外的检测或控制电路，仅利用电压反馈量便可对同步整流进行相移补偿。最后搭建了270V-28V半桥LLC变换器样机，在验证了相移曲线准确性基础上进行350kHz-900kHz频率范围内限流50A的过载限流实验，利用本文提出的控制方法来进行同步整流的相移补偿，在稳态和瞬态过程中均可实现同步整流的准确控制，验证了数字同步整流控制方法的可行性。

Abstract

Synchronous rectification technology can greatly reduce the loss and improve the efficiency of the converter in the application of low voltage and high current output. Under the overload current limiting condition of LLC converter

increasing the switching frequency and reducing the output voltage greatly can limit the output current of LLC converter. However

due to the phase shift between the primary and secondary sides

it is difficult to accurately control the turn-on and turn-off time of synchronous rectifiers. To address this control challenge caused by phase shift

this paper proposes a digital synchronous rectification control method specifically designed for high-frequency LLC converters under overload current limiting conditions. By applying the simplified optimal trajectory control approach

the phase shift curves at different output voltages are derived from state trajectory diagrams

and the computational burden on the digital controller is effectively reduced through curve fitting. This method requires no additional detection or control circuits and achieves phase shift compensation for synchronous rectification solely by utilizing voltage feedback. Finally

a 270V-28V half-bridge LLC converter prototype is built. Based on verifying the accuracy of the phase shift curves

overload current limiting experiments were conducted within a frequency range of 350 kHz to 900 kHz with a current limit value of 50A. Using the proposed control method for phase shift compensation in synchronous rectification

accurate control of synchronous rectification can be achieved both in steady-state and transient processes

demonstrating the feasibility of the digital synchronous rectification control method.

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references

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Related Author

NING Yuhang

BAI Xiaoqing

WANG Kangping

ZHAO Ruochen

WEI Gaohao

Related Institution

School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

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