High-Bandwidth Current Shunt With Extremely Low Stray Magnetic Field Based on Thin-Film Resistors

IF 1.9 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2025-04-04 DOI:10.1109/TMAG.2025.3557788

Jianzhi Xu;Lifang Yi;Woongkul Lee;Jinyeong Moon

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引用次数: 0

Abstract

The use of wide bandgap (WBG) devices introduces higher frequency components into power electronics due to increased switching speeds. To achieve reliable measurement of these high-frequency components in power electronics, high-bandwidth voltage and current probes are essential. While 1 GHz bandwidth voltage probes are commercially available, current probes are typically limited to below 200 MHz. A resistive current sensor, often called a current shunt, converts magnetic field measurement into electric potential measurement, enabling us to use well-established gigahertz-level voltage probes. The overall structure must have an extremely low level of stray magnetic field to minimize parasitic inductance and hence to increase the measurement bandwidth. This article proposes a novel coaxial structure based on thin-film resistors for current shunts. ANSYS Q3D and high-frequency structure simulator (HFSS) simulations demonstrate that this structure effectively cancels magnetic fields along various axes, leading to nearly nonexistent stray fields outside the structure and significantly minimizing parasitic inductance. Experimental results from a prototype with a bandwidth of up to 2.063 GHz validate the proposed design.

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基于薄膜电阻的超低杂散磁场高带宽电流分流

由于开关速度的提高，宽带隙（WBG）器件的使用为电力电子引入了更高频率的元件。为了在电力电子中实现这些高频元件的可靠测量，高带宽电压和电流探头是必不可少的。虽然1 GHz带宽的电压探头是商用的，但电流探头通常限制在200 MHz以下。电阻式电流传感器，通常称为电流分流器，将磁场测量转换为电势测量，使我们能够使用成熟的千兆赫级电压探头。整体结构必须具有极低水平的杂散磁场，以最小化寄生电感，从而增加测量带宽。本文提出了一种基于薄膜电阻的新型同轴结构电流分流器。ANSYS Q3D和高频结构模拟器（HFSS）仿真表明，该结构能有效抵消各轴方向的磁场，使结构外几乎不存在杂散场，寄生电感显著减小。一个带宽高达2.063 GHz的样机的实验结果验证了所提出的设计。

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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来源期刊

IEEE Transactions on Magnetics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

14.30%

发文量

565

审稿时长

4.1 months

期刊介绍： Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.