Transactions of China Electrotechnical Society  2015, Vol. 30 Issue (20): 252-260    DOI:
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Healthy Evaluation on IGBT Solder Based on Electro-Thermal-Mechanical Analysis
Chen Minyou1, Gao Bing1, Yang Fan1, Xu Shengyou1, Xie Peng2
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. Maintenance Branch Company of State Grid Fujian Electric Power Co., Ltd. Fuzhou 350013 China

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Abstract  

The failure of insulated gated bipolar transistor (IGBT) strongly depends on junction temperature, and the main reason for solder delamination is the thermal stress caused by uneven temperature distribution and coefficients of thermal expansion (CTE) mismatch. Therefore, accurate electro-thermal-mechanical model is essential to maintain an efficient operation. This paper presents an electro-thermal- mechanical model and analyzes the characteristics of steady and transient states. Based on the presented model, the failure behavior of solder joint is discussed; the effects of voids on the thermal-mechanical characteristic are analyzed. Results indicate the max value of thermal stress locates on the edge of solder layer and the martin of void. In addition, corner void has great influence on chip temperature. That is, the junction temperature increases with the percentage of center void increases. The junction temperature is 5.10℃ when the percentage of void reaches 50%. Based on the theory of heat energy and thermal stress, a method based on temperature gradient is proposed for evaluating the operation status of solder layer. It is verified that this method is an efficient way to monitor the operation of status of IGBT module. Moreover, the variation of temperature gradient under different degrees of solder failure is analyzed, and the change laws are the same as those of junction temperature. Simulation results indicate this method has a high sensitivity and can track the failure position.

Key wordsIGBT      temperature      electro-thermal-mechanical      void temperature gradient     
Received: 25 November 2013      Published: 30 October 2015
PACS: TM86  
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Chen Minyou
Gao Bing
Yang Fan
Xu Shengyou
Xie Peng
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Chen Minyou,Gao Bing,Yang Fan等. Healthy Evaluation on IGBT Solder Based on Electro-Thermal-Mechanical Analysis[J]. Transactions of China Electrotechnical Society, 2015, 30(20): 252-260.
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