Enhancement of the partial discharge inception voltage of ceramic substrates for power modules by trench coating
Enhancement of the partial discharge inception voltage of ceramic substrates for power modules by trench coating
复制标题
通过沟槽涂层提高功率模块陶瓷基板的局部放电起始电压
DOI：
10.1109/icep.2016.7486885
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Schletz
中科院分区：
文献类型：
--
作者：
U. Waltrich;C. F. Bayer;M. Reger;A. Meyer;X. Tang;A. Schletz
由于高阻隔半导体的不断发展，在不久的将来，功率模块中安装的陶瓷电路板，如DBC（直接键合铜）或AMB（活性金属钎焊）基板，必须隔离超过6.5 kV的高压（HV），并具有高寿命和可靠性。这种高阻断电压和相关的增加的电场强度在陶瓷基板以及封装有机材料中诱发局部放电（PD），这代表HV功率模块的关键退化机制。在这项工作中，提出了一种有前途的新型涂层技术的陶瓷基板沟槽，显着提高这些基板的部分起始电压（PDIV）。该涂层用作折射场控制，并降低了PD最关键部分的场强-所谓的三相点-陶瓷，封装和铜金属化之间。电场模拟表明，该关键区域的电力负载可能减少10%以上。相分辨局部放电（PRPD）测试通过与未处理的基板相比，沟槽涂覆的Al 2 O3 DBC基板（curamik® power）的局部放电起始电压（PDIV）显著增加来确认模拟结果。长期老化测试（1000小时，85 °C/85% r. h.）在用Wacker SilGel 612®覆盖的沟槽涂覆的DBC上进行了测试，以检查该涂层的稳健性并研究取决于老化程度的DBC基材的PD行为。这种新型涂层看起来很有前途。
Due to the ongoing development of high-blocking semiconductors the installed ceramic circuit boards in power modules, such as DBC (Direct Bond Copper) or AMB (Active Metal Brazed) substrates, will have to isolate high voltages (HV) beyond 6.5 kV in the near future with high lifetime and reliability. Such high blocking voltages and the correlating increased electrical field strengths induce partial discharges (PD) in the ceramic substrate as well in the encapsulating organic materials, which represent a key degradation mechanism of HV power modules. In this work a promising novel coating technology for ceramic substrate trenches, significantly enhancing the partial inception voltage (PDIV) of these substrates, is presented. The coating works as a refractive field control and reduces the field strengths in the most critical section for PD - the so-called triple point - between ceramic, encapsulate and copper metallization. Electric field simulations show a possible reduction of the electric loads in that critical area by over 10 %. Phase resolved partial discharge (PRPD) tests confirm the simulation results by significantly increased partial discharge inception voltages (PDIV) of trench coated Al2O3 DBC substrates (curamik® power) compared to untreated ones. Long term aging tests (1000 h @ 85 °C/85 % r. h.) on trench coated DBCs, covered with Wacker SilGel 612®, were executed to examine the robustness of this coating and to investigate the PD behavior of DBC substrates depending on the degree of aging. The novel coating looks very promising.
DOI：
10.1109/tdei.2010.5539704
发表时间：
2010-08
影响因子：
3.1
作者：
Ningyan Wang;I. Cotton;J. Robertson;S. Follmann;K. Evans;D. Newcombe
通讯作者：
Ningyan Wang;I. Cotton;J. Robertson;S. Follmann;K. Evans;D. Newcombe