Soft-Switching Resonant Active Clamp Flyback based-on GaN HEMTs for MHz High Step-Up Applications
编号:113 访问权限:仅限参会人 更新:2021-07-21 20:06:18 浏览:202次 口头报告

报告开始:2021年08月27日 14:00(Asia/Shanghai)

报告时间:15min

所在会场:[Room2] Oral Session 2 [S7&S8] WBG Power Converters & WBG Device Characteristic and Converter Modeling

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摘要
For MHz GaN-based power converters, zero-voltage switching (ZVS) is one of the critical strategies to avoid excessive switching losses of hard-switching. Active clamp flyback (ACF) is one of the most commonly used isolated topologies with the capability of zero-voltage turn on when the switching sequence of the clamping switch is appropriately controlled. However, sharp current drops of leakage inductor current occur after the turn-off actions of the clamping switch, especially in high frequency high step-up applications. This leads to insufficient energy to discharge the junction capacitance of the main switch to achieve zero-voltage turn on. In this paper, the reasons for the current drops and ZVS loss are explained in detail. The related parameters are then analyzed with quantitative derivations. Then, a resonant voltage-doubling ACF converter is proposed with the capability of ZVS in full-load range, optimized transformer designs, and low ringing. The circuit modes and the conditions of ZVS for both switches are discussed, along with the design considerations of the key parameters. All the proposed analyses are verified on a 1 MHz 300W resonant voltage-doubling ACF converter prototype with 28 V input and 180V output.
 
关键词
gallium nitride,zero-voltage switching (ZVS),high frequency,flyback,resonant
报告人
Wuji Meng
Nanjing University of Aeronautics and Astronautics

稿件作者
Wuji Meng Nanjing University of Aeronautics and Astronautics
Lin Li Nanjing University of Aeronautics and Astronautics
Fanghua Zhang Nanjing University of Aeronautics and Astronautics
Jianjun Shu Nanjing University of Aeronautics and Astronautics
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重要日期
  • 会议日期

    08月25日

    2021

    08月27日

    2021

  • 04月21日 2021

    摘要截稿日期

  • 05月15日 2021

    摘要录用通知日期

  • 06月25日 2021

    终稿截稿日期

  • 08月24日 2021

    报告提交截止日期

  • 08月27日 2021

    注册截止日期

主办单位
IEEE
IEEE ELECTRONIC DEVICE SOCIETY
承办单位
Huazhong University of Science and Technology
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