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Isolated Ultrafast Gate Driver with Variable Duty Cycle for Pulse and VHF Power Electronics
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2020-12-01 , DOI: 10.1109/tpel.2020.2999481
Xin Zan , Al-Thaddeus Avestruz

Ultrafast and isolated gate drivers advance the development of pulse and very high frequency power electronics for applications that include LiDAR, space systems, miniaturized hardware, and testing of emerging ultrafast devices. The isolated ultrafast gate driver in this letter achieves a gate voltage slew rate above 12 GV/s with rise and fall times below 260 ps with the proper choice of components. Magnetic isolation provides transient immunity and positive feedback enables dynamic dc restoration to allow arbitrarily long on- and off-times and preserve variable duty cycles. With the isolated ultrafast gate driver, an EPC 2038 GaN FET achieves a drain voltage slew rate of over 37 GV/s when hard-switching and improves total efficiency by 8% (including gating loss) with a careful choice of logic inverters in a symmetric 100 MHz current-mode class D (CMCD) wireless power transfer system. The ultrafast gate driver with isolation and positive feedback was implemented with a commercial radio frequency signal transformer and discrete logic inverters and validated in a hard-switching double pulse test, a narrow pulse test repeating at 165 MHz, and a 100 MHz soft-switching CMCD resonant converter.

中文翻译:

用于脉冲和 VHF 电力电子设备的具有可变占空比的隔离式超快栅极驱动器

超快和隔离式栅极驱动器推动了脉冲和甚高频电力电子设备的开发,这些应用包括 LiDAR、空间系统、小型化硬件和新兴超快设备的测试。通过正确选择组件,本文中的隔离式超快栅极驱动器可实现高于 12 GV/s 的栅极电压压摆率以及低于 260 ps 的上升和下降时间。磁隔离提供瞬态抗扰度,正反馈可实现动态直流恢复,以允许任意长的开启和关闭时间并保持可变的占空比。使用隔离式超快栅极驱动器,EPC 2038 GaN FET 在硬开关时实现超过 37 GV/s 的漏极电压压摆率,并通过精心选择对称 100 MHz 电流模式 D 类中的逻辑反相器将总效率提高 8%(包括门控损耗) (CMCD) 无线电力传输系统。具有隔离和正反馈的超快栅极驱动器使用商用射频信号变压器和分立逻辑逆变器实现,并在硬开关双脉冲测试、165 MHz 重复窄脉冲测试和 100 MHz 软开关 CMCD 中验证谐振转换器。
更新日期:2020-12-01
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