With growing interests in low-inductance silicon carbide (SiC)-based power module packaging, it is vital to focus on system-level design aspects to facilitate easy integration of the modules and reap system-level benefits. To effectively utilize the low-inductance modules, busbar and interconnects should also be designed with low stray inductances. A holistic investigation of the flux path and flux cancellations in the module-busbar assembly, which can be treated as differentially coupled series inductors, is thus mandatory for a system-level design. This article presents a busbar design, which can be adopted to effectively integrate the CREE's low-inductance 1.2-/1.7-kV SiC power modules. This article also proposes a novel measurement technique to measure the inductance of the module-busbar assembly as a whole rather than deducing it from individual components. The inductance of the overall commutation loop of the inverter that encompasses the SiC power module, interconnects, and printed circuit board (PCB) busbar has been estimated using finite-element analysis (FEA). Insights gained from FEA provided the guidelines to decide the placement of the decoupling capacitors in the busbar to minimize the overall commutation loop inductance from 12.8 to 7.4 nH, which resulted in a significant reduction in the device voltage overshoot. The simulation results have been validated through measurements using an impedance analyzer (ZA) with less than 5% difference between the extracted loop inductance from FEA and measurements. The busbar design study and the measurement technique discussed in this article can be easily extended to other power module packages. Finally, the 135-kW inverter has been compared to a similar high-power inverter utilizing a laminated busbar to highlight the performance of the former.

中文翻译：

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135 kW SiC EV牵引逆变器的换向环路电感的估算，最小化和验证

随着人们对基于低电感碳化硅（SiC）的电源模块封装的兴趣与日俱增，至关重要的是集中于系统级设计方面，以促进模块的轻松集成并获得系统级优势。为了有效利用低电感模块，母线和互连也应设计为低杂散电感。因此，对于系统级设计，必须对模块母线组件中的磁通路径和磁通抵消进行整体研究，可以将其视为差分耦合串联电感器。本文介绍了一种母线设计，可以采用该母线设计来有效集成CREE的低电感1.2- / 1.7-kV SiC功率模块。本文还提出了一种新颖的测量技术，可整体测量模块-母线组件的电感，而不是从单个组件中推导出。已经使用有限元分析（FEA）估算了包含SiC电源模块，互连和印刷电路板（PCB）母线的逆变器整个换向环路的电感。从FEA获得的见解提供了确定去耦电容器在母线中的位置的指南，以将总换向环路电感从12.8nH降至7.4nH，从而最大程度地降低了器件电压过冲。仿真结果已通过使用阻抗分析仪（ZA）进行的测量验证，从FEA提取的环路电感与测量值之间的差异小于5％。本文讨论的母线设计研究和测量技术可以轻松扩展到其他电源模块套件。最后，将135 kW逆变器与类似的使用层压母线的高功率逆变器进行比较，以突出前者的性能。