高功率单相桥模块封装热特性研究及优化  

Investigation and optimization of thermal characteristics for high power single phase bridge module

作　　者：王宁[1] 宋海洋[1] 魏家行 刘斯扬[1] 孙伟锋[1] 朱久桃 余传武 朱袁正 

机构地区：[1]东南大学国家专用集成电路系统工程技术研究中心,南京210096 [2]无锡新洁能股份有限公司,无锡214131

出　　处：《东南大学学报（自然科学版）》2016年第5期928-933,共6页Journal of Southeast University：Natural Science Edition

基　　金：港澳台国际合作计划资助项目(2014DFH10190);中国博士后基金资助项目(2015M580376);江苏省博士后科研资助计划资助项目(1501010A)

摘　　要：为了提升高功率应用下单相桥模块的热可靠性,利用有限元仿真分析方法,研究了模块的封装热特性,并与实测结果进行比较,验证了模型求解的准确性和可靠性.结果表明:单相桥模块结壳热阻为0.185 3℃/W,封装7层结构中直接覆铜基板(DBC)陶瓷层占总热阻的52.12%,将DBC陶瓷绝缘材料替换为高导热率绝缘材料能够有效减小结壳热阻;在高功率应用条件下,由功率端子和引线寄生引起的焦耳热将进一步导致结温升高及模块性能下降.在此基础上,具体分析了不同功率端子、引线模型对模块封装热特性的影响.分析表明,采用铜柱型功率端子和增大近端子侧(高电流密度区域)的引线密度或截面直径均可降低结温,从而有助于提高单相桥模块的过电流能力和热可靠性.In order to improve the thermal reliability of single phase bridge module for high power applications,the thermal characteristics of the module are investigated by using finite elements simulation and analysis methods. The accuracy and reliability of simulation analysis are verified by comparing with the measured results. The results showthat the junction-to-case thermal resistance of the power module is 0. 185 3 ℃ / W,while the insulated ceramic layer of direct bonding copper（ DBC）among the 7-layer structure of the module package occupies 52. 12% of it. The solution replacing the initial ceramic layer by the higher thermal conductivity materials can reduce the junction-to-case thermal resistance effectively. Moreover,the parasitic joule heat induced by power terminals and bonding wires will further increase the junction temperature and make the module suffer from more degradation. The influences of different power terminals and bonding wires on the thermal characteristics of the module are analyzed specifically. Both adopting copper pillar power terminals and enlarging the density or cross sectional areas of bonding wires near the terminal side（ high current density region） can reduce junction temperature. As a result,the thermal reliability and current capability of single phase bridge power module can be improved.

关 键 词：单相桥模块 高功率 热阻 功率端子 引线 

分 类 号：TB482.2[一般工业技术—包装工程]