Nonlinear characterization, circuit-based modeling and analysis of single-core fluxgate current sensors

Date

2024-8-29

Author

Çay, Yunus

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Fluxgate current sensors are highly regarded for their accuracy and linearity, making them suitable for safety-related applications such as residual current devices (RCDs). Particularly, the DC measurement capability and sufficient bandwidth of single-core fluxgate current sensors make them ideal for Type B RCDs. However, their simple structure is challenged by the nonlinear operation. The differential equations describing the nonlinear operation could not be solved with classical methods for every continuous BH curve approximation function. Therefore, the piecewise models and assumptions have been stated to address the nonlinear BH curve and sensor operation. Although numerical analysis is an alternative for examining the nonlinear operational characteristics, the modeling and simulation of fluxgate transducers are not adequately elaborated in the literature. This thesis presents new modeling approaches and circuit-based analyses of fluxgate transducers. Modeling and simulation of fluxgate sensors may not yield succinct analytical equations but offer valuable insights into nonlinear circuit behavior. Besides, the thesis presents a nonlinear analytical model based on continuous BH curve approximation function for fixed-frequency excited single-core fluxgate current sensors. The accurate mathematical model accurately represents the DC transfer characteristics of the sensor. Finally, the thesis presents a design consideration for single-core fluxgate current sensors. The impact of design parameters on sensor performance, such as linearity, measurement range, sensitivity, and bandwidth, is thoroughly analyzed. The modeling studies are validated with experimental results. PCB is designed for open-loop and closed-loop single-core self-oscillating fluxgate current sensors. Also, an experimental setup is constructed for the fixed-frequency excited fluxgate current sensor.

Subject Keywords

Fluxgate Current Sensor, Self-oscillating, Nonlinear Modeling, Residual Current

URI

https://hdl.handle.net/11511/111555

Collections

Graduate School of Natural and Applied Sciences, Thesis