Online condition monitoring of SiC devices using intelligent gate drive for converter performance improvement

Jacob Dyer, Zheyu Zhang, Fred Wang, D. Costinett, L. Tolbert, B. Blalock
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引用次数: 9

Abstract

Many intelligent gate drivers being designed for new state-of-the-art WBG devices typically only focus on protection and driving capabilities of the devices. This paper introduces an intelligent gate driver that incorporates online condition monitoring of the WBG devices. For this specific case study, three timing conditions (turn-off delay time, turn-off time, and voltage commutation time) of a silicon carbide (SiC) device are online monitored. This online monitoring system is achieved through gate driver assist circuits and a micro-controller. These conditions are then utilized to develop converter-level benefits for the converter application the SiC devices are placed in. Junction temperature monitoring is realized through turn-off delay time monitoring. Dead-time optimization is achieved with turn-off time monitoring. Dead-time compensation is obtained with turn-off time and voltage commutation time monitoring. The case study converter assembled for testing purposes is a half-bridge inverter using two SiC devices in a phase-leg configuration. All timing conditions are correctly monitored within reasonable difference of the actual condition time. A calibration curve was created to give a direct relationship between turn-off delay time and junction temperature. The half-bridge inverter can operate at 600 Vdc input and successfully obtain a junction temperature measurement through monitored td_off and the calibration curve. Furthermore, the proposed online condition monitoring system is transistor based and suitable for the chip level integration, enabling this practical approach to be cost-effective for end users.
利用智能栅极驱动对SiC器件进行在线状态监测,提高变换器性能
许多智能栅极驱动器被设计用于新的最先进的WBG器件,通常只关注器件的保护和驱动能力。本文介绍了一种能对WBG器件进行在线状态监测的智能栅极驱动器。对于这个具体的案例研究,在线监测了碳化硅(SiC)器件的三个定时条件(关断延迟时间、关断时间和电压换相时间)。该在线监测系统是通过栅极驱动辅助电路和单片机实现的。然后利用这些条件为放置SiC器件的转换器应用开发转换器级效益。通过关断延迟时间监测实现结温监测。通过关闭时间监控可以实现死区时间优化。通过对关断时间和电压换流时间的监测,实现死区补偿。为测试目的组装的案例研究转换器是一个半桥逆变器,使用两个SiC器件在相腿配置中。在与实际工况时间的合理差异范围内,对所有时序条件进行正确监控。建立了一条校准曲线,给出了关断延迟时间与结温之间的直接关系。该半桥逆变器可以在600 Vdc输入下工作,并通过监测td_off和校准曲线成功地获得结温测量值。此外,所提出的在线状态监测系统是基于晶体管的,适合芯片级集成,使这种实用的方法对最终用户来说具有成本效益。
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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