Impact of Biasing Effects on Turn-On Switching Transients of GaN Power eHEMTs: Repeatability and Consistency

IF 7.9 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Mohammad Hedayati;Harry C. P. Dymond;Saeed Jahdi;Bernard Stark
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引用次数: 0

Abstract

Power electronic designers use I-V device characterization, with source meters and double-pulse testing, to choose devices and to validate the circuit layout of converters. Double pulse testing helps designers predict the performance and efficiency of the final converter, without the cost of high-power supplies and loads. However, unlike silicon devices, gallium nitride (GaN) enhancement-mode high-electron-mobility transistor (eHEMTs) are known to suffer from bias effects that impact the device characterization tests as they undergo temporary subtle changes in gate threshold voltage and on-state resistance as a function of their terminal voltages. This raises questions around how closely GaN double-pulse testing resembles continuous switching in a converter and how well source meter results relate to the I-V trajectory of a device that is continuously switching. This article investigates the impact of the bias effects on repeatability and measurement consistency of GaN eHEMT I-V characterizations. The devices evaluated are 650 V Schottky-gate and 600 V ohmic-gate GaN eHEMTs, while 900 V rated SiC mosfets are used as a control, due to their relative insusceptibility to historic terminal bias. The gate threshold voltage derived from source meter measurements is shown to depend on the meter's timings and pulse durations. The switching waveforms from double pulse testing are shown to be different to those of continuous switching, and this difference is a function of how gate and dc-link voltages are applied prior to switching. Continuous switching waveforms are shown to settle within a million cycles. Finally, a preconditioning approach for noncontinuous testing is demonstrated that employs a defined number of pulses to prebias the GaN eHEMT device, thereby causing measurement edges that resemble those of continuous-mode switching.
偏置效应对GaN功率hemt导通开关瞬态的影响:可重复性和一致性
电力电子设计人员使用I-V器件特性、源表和双脉冲测试来选择器件并验证转换器的电路布局。双脉冲测试可帮助设计人员预测最终转换器的性能和效率,而无需高功率电源和负载的成本。然而,与硅器件不同的是,氮化镓(GaN)增强模式高电子迁移率晶体管(ehemt)由于其终端电压的函数而经历栅极阈值电压和导通状态电阻的暂时微妙变化,因此已知会受到影响器件特性测试的偏置效应的影响。这就提出了以下问题:GaN双脉冲测试与转换器中的连续开关有多相似,以及源计结果与连续开关器件的I-V轨迹有多相关。本文研究了偏置效应对GaN eHEMT I-V表征的重复性和测量一致性的影响。所评估的器件是650 V肖特基栅极和600 V欧姆栅极GaN ehemt,而900 V额定SiC mosfet被用作对照,因为它们对历史端偏相对不敏感。从源仪表测量得出的门阈值电压取决于仪表的定时和脉冲持续时间。双脉冲测试的开关波形与连续开关的波形不同,这种差异是开关前如何施加门电压和直流电压的函数。连续开关波形在一百万个周期内稳定下来。最后,展示了一种用于非连续测试的预处理方法,该方法使用一定数量的脉冲来预置GaN eHEMT器件,从而产生类似于连续模式开关的测量边缘。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
13.50
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