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| Analysis on the Failure Mechanism and Degradation Time of CAF between Layers in the PWBs of Avionics Power Supply Module |
| Received:August 09, 2023 Revised:August 31, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.11.006 |
| KeyWord:Conductive Anodic Filament Formation (CAF) failure mode root cause analysis (RCA) degradation time |
| Author | Institution |
| DENG Lin |
The 29th Institute of China Electronics Technology Group Corporation, Chengdu , China;Sichuan Provincial Engineering Research Center of High Efficiency Power Converter Technology, Chengdu , China |
| LIAN Ke |
Agile Intelligent Computing Sichuan Key Laboratory, Chengdu , China |
| HUANG Fu-gang |
The 29th Institute of China Electronics Technology Group Corporation, Chengdu , China;Sichuan Provincial Engineering Research Center of High Efficiency Power Converter Technology, Chengdu , China |
| LI Mo |
The 29th Institute of China Electronics Technology Group Corporation, Chengdu , China |
| YANG Kun |
Agile Intelligent Computing Sichuan Key Laboratory, Chengdu , China |
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| Abstract: |
| The work aims to acquire the MTTF analysis method for the failure mechanism of Conductive Anodic Filament Formation (CAF), so as to facilitate the implementation of engineering optimization decisions in practical cases, thus reducing the risk of failure hazards and the total cost of life cycle. With the failure of CAF in a certain avionics power supply PWB as an example, the relationship among voltage, dielectric spacing and MTTF change was established based on the time characteristic model algorithm of physical and chemical changes of CAF failure mechanism. Based on the simulation calculation data, the improvement and disposal decisions for a specific range of products were formed, thus limiting the further spread of the risk of failure hazards, reducing the maintenance cost of product during life cycle and improving customer satisfaction. It is necessary to master the common failure mechanism of equipment and take appropriate countermeasures to continuously improve the availability, reliability and environmental adaptability of equipment. |
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