Scholarlink

<p>This paper proposes a digital control scheme for dead-time and synchronous rectification (SR) in an LLC resonant converter. The proposed digital control scheme enables optimal zero voltage switching (ZVS), and accurate SR operation over a wide range of loads and operating frequencies. The system operation during dead-time is analyzed, and the turn-on and turn-off timing of the switches for SR are examined using time domain analysis (TDA). Based on these analyses, this study proposes a digital implementation for dead-time and SR control, and defines the control priorities within the overall scheme. To improve the control accuracy, a current transformer (CT) without additional components is incorporated into the resonant circuit to detect the current when the primary switch turns off. This method reduces circuit complexity and improves reliability compared to conventional methods. The proposed digital control scheme improves efficiency by up to 5.48% compared to a diode rectifier. The conduction time of the switches for SR demonstrates a minimum error of 0.05% compared to the experimental results.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Digital control strategy for dead-time and synchronous rectification in GaN-based LLC resonant converters

  • 期刊论文

  • 发表日期：

    2025年7月15日

查看全文
  • Yunsuk Oh,
  • Jaehyeok Jang,
  • Younghoon Cho

摘要

This paper proposes a digital control scheme for dead-time and synchronous rectification (SR) in an LLC resonant converter. The proposed digital control scheme enables optimal zero voltage switching (ZVS), and accurate SR operation over a wide range of loads and operating frequencies. The system operation during dead-time is analyzed, and the turn-on and turn-off timing of the switches for SR are examined using time domain analysis (TDA). Based on these analyses, this study proposes a digital implementation for dead-time and SR control, and defines the control priorities within the overall scheme. To improve the control accuracy, a current transformer (CT) without additional components is incorporated into the resonant circuit to detect the current when the primary switch turns off. This method reduces circuit complexity and improves reliability compared to conventional methods. The proposed digital control scheme improves efficiency by up to 5.48% compared to a diode rectifier. The conduction time of the switches for SR demonstrates a minimum error of 0.05% compared to the experimental results.