计及MOSFET关断过程的LLC变换器死区时间选取及计算

发布时间：2018-01-04 09:36

本文关键词：计及MOSFET关断过程的LLC变换器死区时间选取及计算　出处：《电力自动化设备》2017年03期 　论文类型：期刊论文

【摘要】：死区时间的合理选取是LLC变换器MOSFET开关管在宽调节范围内实现零电压开通(ZVS)以降低电磁干扰并提升运行效率的必要条件。现有选取方法因忽略MOSFET关断过程对死区时间的重要影响,选取结果实用性较差。通过理论研究给出了使LLC变换器在宽调节范围内实现ZVS的死区时间选取原则,参照该原则详细描述并合理简化最恶劣工况下计及MOSFET关断瞬态的LLC变换器工作过程。在此基础上,通过对MOSFET手册中数据的分析运用,精确算得最恶劣工况下LLC变换器实现ZVS所需死区时间的最小值,最终给出LLC变换器在宽调节范围内实现ZVS所需死区时间设定值的计算方法。该方法计算过程简单直观,实验结果亦验证了其正确性和有效性。
[Abstract]:The reasonable selection of dead time is that the MOSFET switch of LLC converter realizes zero voltage switching on in a wide range of regulation. In order to reduce the electromagnetic interference and improve the operational efficiency of the necessary conditions. The existing selection methods because of ignoring the MOSFET turn-off process on the dead time of the important influence. The selection result is not practical. Through the theoretical research, the principle of dead-time selection for LLC converter to realize ZVS in a wide range of regulation is given. Referring to this principle, the working process of LLC converter with MOSFET turn-off transient is described in detail and reasonably simplified under the worst working conditions. On this basis, the analysis and application of the data in the MOSFET manual are carried out. The minimum dead time of LLC converter to realize ZVS is calculated accurately in the worst working condition. Finally, a method for calculating the dead-time of ZVS in a wide adjustment range is presented. The calculation process is simple and intuitive, and the experimental results also verify its correctness and effectiveness.
【作者单位】：华北电力大学新能源电力系统国家重点实验室;河北农业大学机电工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2015-AA050603)~~
【分类号】：TM46
【正文快照】： 0引言因具备极高的运行效率和功率密度,LLC变换器得到了工业界和学术界的广泛关注并成为实现光伏模块最大功率点跟踪的实用拓扑之一[1-2]。近年来国内外学者对LLC变换器的研究已经十分深入:文献[3]采用模态分析法精确描述了LLC变换器的运行过程及特性,在解决了传统基波近似分

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