Accurate measurement of current through a silicon carbide (SiC) device is especially challenging, because of its fast switching speed. Its accompanied current sensor must hence have a high-bandwidth and a high-noise immunity. It must also not interfere with operation of the device. Due to these, the printed-circuit-board (PCB) Rogowski current sensor is particularly suitable, but normally requires many layers. With only four layers, the existing Rogowski coils are not yet capable of shielding ambient voltage and magnetic noises simultaneously. Moreover, their computed and measured self-inductances are usually very different with errors as high as 45% reported in the literature. To resolve these issues, an alternative four-layer screen-returned PCB coil has been presented. The described coil uses very few turns to preserve its high bandwidth at the expense of even tougher determination of its self-inductance. An alternative piecewise modelling method has therefore been proposed for finding its self-inductance, needed for designing its theoretical bandwidth. These, together with a non-inverting integrator, permit current through an SiC device to be measured accurately, as demonstrated experimentally.

中文翻译：

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用于高带宽SiC电流测量的极少匝数的四层屏返回PCB Rogowski线圈的结构和建模

由于其快速的开关速度，因此准确测量通过碳化硅（SiC）器件的电流尤其具有挑战性。因此，其随附的电流传感器必须具有高带宽和高抗噪性。它也不得干扰设备的操作。由于这些原因，印刷电路板（PCB）Rogowski电流传感器特别适合，但通常需要多层。现有的Rogowski线圈只有四层，尚不能同时屏蔽环境电压和电磁噪声。而且，它们的自感计算值和实测值通常相差很大，文献中报道的误差高达45％。为了解决这些问题，已经提出了一种替代的四层屏返回式PCB线圈。所描述的线圈使用很少的匝数来保持其高带宽，但代价是更加难以确定其自感。因此，已经提出了一种替代的分段建模方法来寻找其自感，这是设计其理论带宽所需要的。这些与同相积分器一起，可以准确地测量通过SiC器件的电流，如实验所示。