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基于热阻测量的PCB散热特性

, PP. 239-244

Keywords: PCB,热过孔,热阻,ANSYS,仿真,散热

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Abstract:

基于肖特基结电压随温度变化的特性,本文测量了真空下被测器件SiC二极管工作时PCB的热阻。通过测量SiC二极管的稳态加热响应曲线,进而利用其小电流下的温敏特性得到器件纵向热阻结构,分析出PCB的热阻。研究了不同覆铜量,不同热过孔直径的PCB的散热特性。实验结果表明,增加覆铜量能明显减小PCB的热阻。覆铜量相同时,PCB上增加热过孔能显著减小其热阻,并且PCB的热阻随着热过孔直径的增大而减小。通过有限元ANSYS软件仿真了不同覆铜量,不同热过孔直径的PCB温升,其结果与实验结果一致。

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