Evaluation of impact of parasitic magnetic coupling in PCB layout on common source inductance of surface mounted package
Evaluation of impact of parasitic magnetic coupling in PCB layout on common source inductance of surface mounted package
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DOI：
10.1109/peds.2017.8289182
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发表时间：
2017-12
期刊：
影响因子：
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通讯作者：
Ryunosuke Matsumoto;K. Aikawa;Akihiro Konishi;Kazuhiro Umetami;E. Hiraki
中科院分区：
文献类型：
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作者：
Ryunosuke Matsumoto;K. Aikawa;Akihiro Konishi;Kazuhiro Umetami;E. Hiraki
近年来，共源电感被认为是实现开关变流器超快开关的重要障碍之一。指出CSI是开关速度恶化和误触发的主要原因。因此，许多下一代开关器件，如GaN-FET和SIC-MOSFET的设计指南都指出了降低CSI的必要性。当然，许多下一代开关器件都是在表面贴装封装中提供的，以便使印刷电路板设计人员能够通过消除公共源极路径来最大限度地减少CSI。然而，选通电路和电源电路之间的寄生磁耦合仍然可能增加CSI，尽管先前的研究几乎没有报道印刷电路板布局对CSI和开关波形的影响有多大。本文从实验上评估了印制板版图的寄生磁耦合对表面贴装封装的CSI和开关波形的影响。结果发现，寄生磁耦合是造成CSI的主要原因。此外，还发现磁耦合的不同导致了关断开关波形的较大差异。文中还对其原因进行了分析和讨论，指出了合理设计寄生磁力偶合器在印制电路板布局中的重要性。
Recently, the common source inductance (CSI) is regarded as one of the most important obstacles for achieving ultrafast switching of switching converters. The CSI is pointed out to be a major cause of deterioration of the switching speed and false triggering. Therefore, many design instructions of next generation switching devices, such as GaN-FETs and SiC-MOSFETs, have pointed out the necessity to reduce the CSI. Certainly, many of the next generation switching devices are provided in surface mount packages in order to enable PCB designers to minimize the CSI by eliminating the common source path. However, the parasitic magnetic coupling between the gating circuit and the power circuit may still add the CSI, although preceding studies have scarcely reported how greatly the PCB layout can affect the CSI and the switching waveforms. This paper experimentally evaluated the impact of the parasitic magnetic coupling of the PCB layout on the CSI of the surface mount package and on the switching waveforms. As a result, the parasitic magnetic coupling was found to cause the major difference in the CSI. In addition, large difference in the turn-off switching waveforms was found to be caused by the difference in the magnetic coupling. The reason is also analyzed and discussed in this paper, suggesting importance of appropriate design of the parasitic magnetic coupling in the PCB layout.