The current life assessment of power devices only predicts the lifetime of the devices in continuous operation, and does not take into account the changes of thermal resistance caused by device aging and dust accumulation in the whole life cycle. In order to solve this problem, this paper takes the electric vehicle charging module as the application scene, selects the VIENNA rectifier as the front-stage topology of the 30 kW charging module, and proposes a flexible equivalent thermal model to characterize the aging and dust accumulation of the devices. Considering the influence of the mission profile of the devices working intermittently, the lifetime of the continuous working power devices and the actual intermittent working power devices in different scenarios are predicted respectively.

目前对功率器件的寿命评估只是对器件在连续运行中的寿命进行预测，并没有考虑器件在整个生命周期内因老化和积尘引起的热阻变化。为了解决这个问题，本文以电动汽车充电模块为应用场景，选择VIENNA整流器作为30kW充电模块的前级拓扑，提出了一种灵活的等效热模型来表征老化和灰尘设备的积累。考虑间歇工作设备任务剖面的影响，分别预测了不同场景下连续工作电源设备和实际间歇工作电源设备的寿命。