基于钎焊技术的大功率PEBB散热器性能分析

Thermal Performance Analysis of High Power PEBB Heatsink Based on Vacuum Brazed Technique

针对大功率电力电子积木模块(PEBB)功率密度与散热之间的矛盾,提出了一种基于真空钎焊技术的散热器技术方案。首先,通过建立PEBB的功率耗散模型,定量计算出PEBB功率损耗值。然后,通过建立PEBB的热阻抗模型,结合PEBB功率损耗,定量估算出PEBB结温、壳温及散热器自身温升等重要指标参数,从而为真空钎焊散热器设计提供了理论依据。最后,通过flotherm软件仿真并搭建原理样机进行实验验证,实验结果与理论分析值基本吻合,从而证实了该真空钎焊散热器是一种适合于大功率开关器件的较为理想的散热器。

Focus on contradiction between power density and heat radiator for high power power electronics building blocks （PEBB）, this paper proposes the vacuum brazed technique scheme.Firstly, the power dissipation model of PEBB is built to calculate power loss quantitatively.Then, the thermal resistance model is introduced to estimate temperature rises parameter of junction, case and heatsink so as to provide theoretical law for the design of PEBB heatsink.Lastly, simulation and experiments are performed using flotherm software and three phase AC converter prototype.The results are coincide with theoretical analysis and demonstrate the effectiveness of the proposed scheme.The vacuum brazed heatsink is available for high power PEBB devices.