【应用】超软导热垫片THERM-A-GAP™G569助力汽车转向系统ECU散热

时间： 2020-01-28 来源：世强

技术问答

EPS-ECU是电动助力转向的核心部件，其中有功率器件、电阻、各类芯片等，在运行时要产生功率损耗，功率损耗会转变为热量使功率器件管芯发热、结温升高，各类芯片电阻以及控制器壳体温度升高。由于控制器均有其正常工作温度，因此及时有效的将热量释放，控制控制器温度，才能确保电子器件正常工作。据有效统计，温度每上升10度，器件工作效率及寿命下降一倍，而器件主要发热源是MOSFET（如图一），因此有效及时将MOSFET的热能传递出去就是ECU散热的重点方向。

目前行业内散热方案有很多，下面重点介绍导热垫片在汽车转向系统ECU内的应用。

ECU散热设计要求：

1、硬度较小<Shore00 20；

2、可压缩型变量大，最大型变量70%；

3、背压小，减少对器件以及PCB压变应力；

4、长期可靠性，稳定性，不开裂，不变硬；

5、导热性能要求不高，1.5-2W/mk；

6、良好电气绝缘性>5KVac；

7、成本低，用于非全自动化产线。

这里推介派克固美丽THERM-A-GAP™G569系列导热垫片，导热系数为1.5W/mK。其特点是超软柔顺，标准硬度shore 00为10，可单面或双面自带粘性，紧密黏贴MOS与散热金属壳之间的界面，对MOS应力小，截面接触好，从而达到高导热效率。其超软柔顺性使其压缩型变可达到70%，而且绝缘强度达到8KVac/mm，同时有带玻纤、绝缘膜等版本，增强物理性能及电气绝缘性。物性表参看如下：

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应用笔记或设计指南 - PARKER CHOMERICS - 2022/2/17 PDF 英文下载