| 引用本文: | 吕正,颜湘武,孙磊,樊威.计及MOSFET关断过程的LLC变换器死区时间选取及计算[J].电力自动化设备,2017,37(3): |
| Lü Zheng,YAN Xiangwu,SUN Lei,FAN Wei.Selection and calculation of LLC converter dead-time considering turn-off transient of MOSFET[J].Electric Power Automation Equipment,2017,37(3): |
|
| 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。 |
| 关键词: 死区时间； LLC变换器； 最恶劣工况； MOSFET 关断瞬态；零电压开通 |
| DOI：10.16081/j.issn.1006-6047.2017.03.028 |
| 分类号: |
| 基金项目:国家高技术研究发展计划(863计划)资助项目(2015-AA050603) |
|
| Selection and calculation of LLC converter dead-time considering turn-off transient of MOSFET |
|
Lü Zheng1, YAN Xiangwu1, SUN Lei2, FAN Wei1
|
|
1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.College of Mechanical and Electrical Engineering, Agricultural University of Hebei, Baoding 071001, China
|
| Abstract: |
| The rational selection of dead-time for the MOSFETs of LLC converter is essential to achieve the ZVS(Zero Voltage Switching) within a wide adjustment range for reducing the electromagnetic interference and improving the operational efficiency. The existing selection methods ignoring the influence of the MOSFET turn-off transient on the dead-time have lower applicability. Theoretical analysis is carried out to obtain the dead-time selection principles for achieving ZVS within a wide adjustment range of LLC converter, according to which, the operational behaviors of LLC converter including the turn-off transient of MOSFET in the worst operating conditions are exactly described and properly simplified. A method based on the specifications of MOSFET datasheet is presented for calculating the minimum dead-time required in the worst operating conditions to realize the ZVS within a wide adjustment range of LLC converter. The proposed method is simple and intuitive, and its correctness and validity are verified by the experimental results. |
| Key words: dead-time LLC converter worst operating conditions MOSFET switching transient zero voltage switching |
