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本文重点研究了可关断晶闸管（ＧＴＯ）正向阻断结的三种失效机理。在ＧＴＯ关断过程中，阳极瞬时峰值功耗、阳极尖峰电压和阳极再加峰值电压达到极限时都可造成正向阻断结的损坏，从而使ＧＴＯ关断失效。从器件内部载流子的输运规律出发，作者阐述了这三个极限参数引起ＧＴＯ失效的机理，建立了三种不同的失效模式；首次研究了ＧＴＯ关断过程中下降时间内瞬时峰值功耗和尖峰电压相对位置的关系。
This article focuses on three failure mechanisms that can turn off the forward blocking junctions of thyristors (GTOs). During the GTO turn-off process, the instantaneous peak power dissipation at the anode, the anode spike voltage and the anode plus peak voltage reach the limit, causing damage to the positive blocker junction, thereby failing the GTO shutdown. Starting from the transport law of carriers inside the device, the author elaborates the mechanism of these three limit parameters causing GTO failure and establishes three different failure modes. The transient peak power consumption during the falling time of GTO is first studied And the peak voltage relative position of the relationship.