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Comprehensive Failure Mechanisms in High Voltage P-i-N Diode During Turn-off Transient |
Luo Haoze, Li Wuhua, He Xiangning |
School of Electrical Engineering Zhejiang University Hangzhou 310027 China |
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Abstract In this paper, the turn-off transient failure of commercial high voltage multi-chip P-i-N diode under the rated parameters in clamped circuit is discussed from the circuit layout aspect and semiconductor mechanism aspect. Firstly, through the failure chips and failure waveforms, it is proved that the riskiest chip instead of the modules determines the reliability of power converter system. Besides, according to the filament current phenomenon of P-i-N diode under the deepest dynamic avalanche, the impact of local over temperature induced by the unbalanced current distribution is discussed. It is concluded that the failure mechanism of P-i-N is the positive feedback of thermoelectric coupling mechanism. Finally, based on the failure results and test conditions, the comprehensive failure mechanisms of power device are proposed. It is shown that the failure mechanisms are not induced by one single factor but the combined effects of all related factors.
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Received: 19 September 2015
Published: 01 November 2016
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