Magnetic Modulation Current Sensor Based on Single Magnetic Ring and Three Windings

doi:10.16628/j.cnki.2095-8188.2024.04.006

Abstract

Abstract:

The existing high-precision closed-loop magnetic modulation current sensors mostly use double or even triple magnetic ring structures, which usually have disadvantages such as large volume, complex modulation and demodulation circuits, and inconsistent magnetic ring characteristics. A closed-loop magnetic modulation current sensor based on a single magnetic ring and three winding structure is proposed. Based on the average excitation current method, the further research is conducted to simplify the understanding of the modulation circuit. By adding an induction winding and corresponding computing circuit, the signal noise caused by transformer effect is eliminated. And using genetic algorithm to optimize the values of some sensor parameters, the sensor performance is improved. The proposed design has a simple structure, small size, large range, high accuracy, and meets the measurement needs of large DC currents.

Key words: single magnetic ring and three winding, magnetic modulation current sensor, average excitation current, genetic algorithm

CLC Number:

TM933

GUO Zhenzhen, CHEN Wei, CHEN Chong, ZHOU Anyue, LIN Zhenquan. Magnetic Modulation Current Sensor Based on Single Magnetic Ring and Three Windings[J]. LOW VOLTAGE APPARATUS, 2024, 0(4): 45-52.

Figures/Tables 20

References 19

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磁环参数	数值
剩余磁感应强度B_r/mT	157
矫顽力H_c/(A·m^-1)	1.336
有效磁路长度l_e/mm	78.75
有效截面积A_e/mm²	45.86

系统参数	数值	系统参数	数值
励磁绕组N_ex/匝	225	门限电阻R₂/Ω	11 000
反馈绕组N_s/匝	200	噪声采样电阻R₃/Ω	0.4
感应绕组N_i/匝	200	反馈电阻R₄/Ω	0.4
励磁电流采样电阻R_s/Ω	0.2	反馈电压采样电阻R_m/MΩ	1
门限电阻R₁/Ω	1 500	LPF截止频率/Hz	10