High Sensitivity Current Transformer with low Settling Time, for Magnified AC Current Measurements in Pulsed Applications

G. Tsolaridis, Pascal Seiler, J. Biela
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引用次数: 2

Abstract

In solid-state pulsed power systems based on switching converters often a low amplitude, high frequency ripple current is superimposed on the high flat-top pulse current. Despite its low amplitude (usually measured in ppm) the ripple current could have a major impact on the performance of the system and therefore needs to be quantified/reduced. However, measuring such currents is challenging, due to the limited resolution of the current probe, especially when the DC offset current of the pulse is in the kA range. Therefore a suitable AC current probe able to perform magnified ripple current measurements with high fidelity is proposed in this paper. The probe is based on the principle of current transformers and filters the DC offset of the pulsed current, enabling to measure the ripple with a very high resolution. The design trade-offs of the conventional CT for such an application are explained, and an adaptive burden resistance topology is proposed in order to achieve simultaneously a low settling time, which is essential for measuring short pulses, and the needed high sensitivity, while maintaining a relatively high bandwidth.
高灵敏度电流互感器,低沉降时间,用于脉冲应用中的放大交流电流测量
在基于开关变换器的固态脉冲电源系统中,通常是低幅值、高频纹波电流叠加在高平顶脉冲电流上。尽管纹波电流的幅度很低(通常以ppm为单位测量),但它可能对系统的性能产生重大影响,因此需要进行量化/减小。然而,由于电流探头的分辨率有限,特别是当脉冲的直流偏置电流在kA范围内时,测量这样的电流是具有挑战性的。为此,本文提出了一种适合于高保真放大纹波电流测量的交流电流探头。该探头基于电流互感器原理,对脉冲电流的直流偏置进行滤波,能够以非常高的分辨率测量纹波。解释了传统CT在此类应用中的设计权衡,并提出了一种自适应负载电阻拓扑,以同时实现低沉降时间(这对于测量短脉冲至关重要)和所需的高灵敏度,同时保持相对高的带宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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