Analysis and design of a self-oscillating bidirectionally saturated fluxgate current sensor. (June 2020)

• Record Type: Journal Article
• Authors: Yang, Xiaoguang; Wen, Jing; Chen, Meiqi; Gao, Zheng; Xi, Ligen; Li, Yuqi
• Is Part Of: Measurement. Volume 157(2020)
• Publication Date: 2020-06
• Subjects: Current measurement -- Current sensor -- Fluxgate sensor; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2020.107687
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlight: A new accurate linear model for self-oscillating fluxgate technology. Fast current measurement without time delay. Use edge trigger to effectively reduce switching noise. Suitable for high temperature environment and has good temperature stability. Abstract: This paper proposes a current measurement concept of a bidirectionally saturated fluxgate current senor based on open-loop self-oscillating fluxgate technology. In the proposed method, the current can be measured without time delay, because the measured current can be obtained by using time difference between the first half-cycle and the second half-cycle of the exciting circuit. In addition, using of a nanocrystalline alloy core in the current sensor can make it achieve good temperature property. An experimental prototype was designed based on analytical models. The design procedure of the current sensor includes basic configurations of the sensor probe and design considerations of signal electronics. And a method for testing the equivalent inductance of the current sensor probe is proposed when the magnetic core in saturated state. The test results confirm the measurement concept and the linearity, resolution, sensitivity and power consumption of the sensor are analyzed.