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Partial discharge measurement and analysis in PPIs

机译:PPI中的局部放电测量和分析

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摘要

Electrical insulation capability is one of the most critical challenges for press-pack insulated gate bipolar transistors (IGBTs), but the knowledge of its insulation failure mechanism is much less mature. To understand the insulation failure mechanism, partial discharge (PD) measurement and analysis in press-pack IGBT (PPI) submodule were performed in this study. A dedicated PD measurement system for PPIs was designed and fabricated, and fast oscilloscope, PD detector and ultraviolet (UV) image camera were employed to observe the PD. PD-induced insulation failure phenomenon in the submodule was observed under direct current voltage, and UV images indicated that the discharge occurred at the periphery of the die. Phase-resolved PD (PRPD) analysis method for PPIs was developed and three elementary structures were used to simulate the PD in the electric field reinforcement areas identified by electric field analysis. According to PRPD patterns, the observed PD in the submodule was considered to be mainly caused by a mismatch between the electric field and critical electric field on the surface of passivation layers of the die. The inference was verified at different gas pressures because a decrease of PD inception voltage in the submodule and the bare die was observed at lower gas pressure.
机译:电绝缘能力是压装绝缘栅双极型晶体管(IGBT)的最关键挑战之一,但是其绝缘失效机制的知识还远远不够成熟。为了了解绝缘失效的机理,本研究对压装式IGBT(PPI)子模块中的局部放电(PD)进行了测量和分析。设计并制造了专用于PPI的PD测量系统,并使用快速示波器,PD检测器和紫外(UV)摄像头观察PD。在直流电压下观察到PD引起的子模块中的绝缘破坏现象,UV图像表明放电发生在模具的外围。开发了用于PPI的相分辨PD(PRPD)分析方法,并使用三个基本结构来模拟通过电场分析确定的电场增强区域中的PD。根据PRPD模式,在子模块中观察到的PD被认为主要是由管芯钝化层表面上的电场和临界电场之间的不匹配引起的。由于在较低的气压下观察到子模块和裸芯片中的PD起始电压降低,因此在不同的气压下验证了该推论。

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