基于热扩散时间功率模块热疲劳状态监测

This letter proposes an aging indicator for thermal fatigue based on thermal diffusion time. Initially, two types of times are analyzed: first, thermal propagation time—the time required for heat to propagate; second, thermal diffusion time—the time required for a noticeable temperature change. The former is derived from the Cattaneo model, incorporating thermal relaxation time, while the latter i...