【选型】用于变频器功率逆变单元IGBT单管TO247-3散热的导热垫片：69-11-43416-MCS30GL

时间： 2020-02-15 来源：世强

技术问答

水泵变频器是通过改变频率来改变水泵电机的转速与启用台数，自动调节峰谷用水量，保证供水管网压力恒定，以满足用户用水的需求，其典型应用电路示意图参考如下图1所示。

图1：水泵变频器功率拓扑电路图

为实现低成本设计，其功率逆变单元常用TO247-3标准封装的IGBT单管设计，单机6颗，为改善水泵变频器IGBT单管散热能力，更大程度上降低IGBT单管表面的温度，一般需要在IGBT单管背面通过导热界面材料（TIM）与散热器接触散热，其散热模型参考如下图2所示。

图2：IGBT单管散热模型示意图

针对水泵变频器IGBT单管背面与散热器间的散热材料选型时一般需要考虑以下几个因素：

1、高导热系数

2、低热阻

3、具有可压缩性，考虑到IGBT单管的容差影响，要求压缩前厚度1.5mm；

4、尺寸：根据TO247-3封装的IGBT单管尺寸设计，一般选择尺寸接近21mm x 16mm，参考如下图3所示：

图3：IGBT单管标准TO247-3封装尺寸示意图

5、需要带胶，至少一面带胶，可以贴于IGBT单管背面，便于组装；

6、为保证安全性，导热材料需要绝缘，绝缘耐压参考IGBT单管的工作电压，通常选择耐压达650V的IGBT单管，在IGBT单管异常时出现上下管直通时，母线电压约1200V，故选择绝缘耐压能力至少1500V；

7、低成本

针对如上的设计需求，可推荐PARKER CHOMERICS（派克顾美丽）MCS30系列导热垫片，型号为69-11-43416-MCS30GL，封装尺寸为30.2x22x1.5mm，可裁切后用于2个IGBT单管，满足设计需求，该导热垫片颜色为粉色，导热系数为3.0W/mK，双面带胶（硅胶自然粘性），绝缘耐压强度为11KVac/mm，在20psi压力和1mm的厚度下热阻仅为0.4℃-in2/W，Shore OO硬度仅为25，质地非常柔软，典型电性参数参考如下图4所示。

图4：Parker Chomerics（派克顾美丽）导热垫片69-11-43416-MCS30GL典型电性参数

最后，总结下推荐Parker Chomerics（派克顾美丽）导热垫片69-11-43416-MCS30GL的理由：

1、3.0W/mK高导热系数，可满足快速散热的设计需求；

2、11KVac/mm绝缘耐压强度，提供高安全的绝缘耐压能力；

3、压变应力小，力学强度高，耐磨损；

4、硬度小，回弹性好；

5、是一款可用于标准TO247-3封装尺寸设计的导热垫片，世强电商平台上有现货样品，可以快速支持样品服务。

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