A Coffin-Manson model to predict the TRIAC solder joints fatigue during power cycling

摘要

In this paper, a physical model is proposed to estimate the TRIAC solder joints fatigue during power cycling. The lifetime prediction is based on the following assumptions: the case temperature swing (ΔTcase) is the main acceleration factor, the solder joints are the weakest materials in the TRIAC assembly, and the plastic strain within the solder layer due to shearing is the failure cause.