脉冲功率晶闸管的小型化

Miniaturization of Thyristor Applied in Pulse Power Supply

小型化与轻量化是脉冲功率电源实用化的关键技术。功率半导体开关占据了脉冲电源体积相当大的比例。为减少功率半导体开关的体积与重量,本文提出一种以减薄铜基座对其进行小型化的方法。该方法通过建立和求解晶闸管暂态热传导数学模型,来分析晶闸管在浪涌电流下温度对时间和空间分布的特性。计算结果表明:在脉冲功率应用中,晶闸管铜基座厚度与硅片的峰值结温无关,铜基座厚度仅对热量的扩散时间和热平衡后的稳态平均温度有微量影响。根据理论计算的结果,本文试制了薄壳晶闸管样品,其厚度仅为常规型号的一半。样品测试结果显示了晶闸管浪涌电流能力和di/dt与常规管壳的基本一致。薄壳方案同样适用于二极管。

Miniaturization and lightening of pulse power supply（PPS） is a key technique in electromagnetic launch.Semiconductor switch module in PPS takes up a large volume.To obtain a compact and small semiconductor module,a method to miniaturize the module by reduce the thickness of copper substrate of thyristor is proposed.And its thermal model is established to analyze its instaneoμs temperature field.Based on the simulation results,it is found that the copper substrate thickness of thyristor does not affect the peak junction temperature,but affects the final time to cool slightly.According to the theory basis,a prototype of thinner thyristor is produced.It is proved that the thinner thyristor has the similar current capacity and di/dt capacity with conventional type.