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A high accuracy fluxgate DC current sensor applicable to two-wire electric appliances

  • Yang Liu
  • Yuan Lin
  • Qinhong Lan
  • Dong F. WangEmail author
  • Toshihiro Itoh
  • Ryutaro Maeda
Technical Paper
  • 17 Downloads

Abstract

This paper presents a novel high-precision low noise self-oscillating fluxgate DC current sensor that can be used for two-wire measurement. This new sensor mainly consists of an EE-type ferromagnetic core, an oscillator, an inverter, six windings, sampling resistors, a feedback compensation circuit and a potential collection circuit. Two primary coils are placed in the hollow hole of the middle arm to realize the condition of fluxgate effect. The sensor still satisfies the average current model even when considering the mutual inductance among the windings. It can reach the ampere-turn balance by feedback and compensation to eventually achieve zero-flux detection. A new scheme to suppress secondary modulation ripple has been proposed by designing magnetic path and arranging the windings. In addition, researches have been conducted to study some relevant factors of eliminating secondary modulation ripple in this new way. Some relevant factors influencing the elimination of noise are simulated. The outcomes show that sum of the secondary modulation ripple voltage in the feedback compensation windings reaches a peak value of about 0.7 mV when the parameters of both circuits and magnetic path in the sensor’s left and right parts are symmetrical. And the more asymmetrical these parameters are, the larger ratio of suppressing noise is. That makes the sensor better perform under the condition of temperature drifting and decreases the influence of the error of both electric components and during the process of measurement.

Notes

Acknowledgements

This work is partially supported by the National Natural Science Foundation of China (Grant no. 51675229, Grant no. 51775531). Part of this work is also financially supported by Scientific Research Foundation for Leading Professor Program of Jilin University (Grant no. 419080500171 & no. 419080500264). Authors would like to express great gratitude to all the members in Micro Engineering and Micro Systems Laboratory at Jilin University for valuable supports and profound encouragements.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Micro Engineering and Micro Systems Laboratory, School of Mechanical and Aerospace EngineeringJilin UniversityChangchunChina
  2. 2.Research Center for Ubiquitous MEMS and Micro EngineeringAISTTsukubaJapan
  3. 3.Department of Human and Engineered Environmental StudiesThe University of TokyoChibaJapan
  4. 4.State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina

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