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郑祥杰,谷恭山,石健将.LLC直流变压器同步整流与临界连续过谐振控制[J].电源学报,2019,17(4):16-23
LLC直流变压器同步整流与临界连续过谐振控制
Synchronous Rectification and Over-resonant Control in Critical Conduction Mode of LLC DC-DC Transformer
投稿时间:2017-11-20  修订日期:2019-01-02
DOI:10.13234/j.issn.2095-2805.2019.4.16
中文关键词:  LLC直流变压器  同步整流  临界连续  过谐振控制
英文关键词:LLC DC-DC transformer  synchronous rectification  critical conduction  over-resonant control
基金项目:国家自然科学基金资助项目(51277162)
作者单位E-mail
郑祥杰 浙江大学电气工程学院, 杭州 310027  
谷恭山 浙江大学电气工程学院, 杭州 310027  
石健将 浙江大学电气工程学院, 杭州 310027 jianjiang@zju.edu.cn 
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中文摘要:
      采用固定开关频率的LLC谐振式直流变压器已广泛应用于各类隔离式两级结构拓扑中。针对应用于宽电压输入、大电流输出、工作于完全谐振状态且采用同步整流的LLC直流变压器,分析了其副边受同步整流管寄生结电容的影响而无法实现临界导通模式CCM的现象与原因,提出了无需额外传感器的同步整流数字控制计算方法;利用LLC直流变压器输出电压不控的特点,提出了基于效率优化的临界连续过谐振控制策略,分析了该控制策略在轻载时优于传统的完全谐振开环控制策略的原因;最后,搭建了1台实验样机,验证了该控制策略的正确性和可行性。
英文摘要:
      LLC resonant DC-DC transformers with fixed switching frequency have been widely used in various two-stage isolated topologies. Based on an LLC DC-DC transformer which is applied to a scenario with wide voltage input and high current output and operated in a fully resonant state with synchronous rectification, a digital-controlled computational method of synchronous rectification without additional sensors is proposed by analyzing the phenomenon and reason that critical conduction mode(CCM) cannot be realized due to the influence of the parasitic junction capaci-tance of the synchronous rectifier on the secondary side. According to the characteristics of uncontrolled output voltage from the LLC DC-DC transformer, an over-resonant control strategy in CCM based on efficiency optimization is proposed, and the reason why this control strategy is better than the traditional resonant open-loop control strategy under light load is analyzed. Finally, an experimental prototype was built, which verified the validity and feasibility of the proposed control strategy.
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