Contactless Current Sensor With Novel Coil Designs and Hall-Effect Based Electron Device for Dynamic Precision Adjustment

Abstract

The conventional approach of contactless current sensing using Rogowski’s coil is associated with unavoidable design constraints that limit the sensitivity, rise time, settling time, and bandwidth of operation. This article discusses some novel coil designs for contactless current measurement along with an electron device that works based on a brace-shaped Hall plate for dynamic precision adjustment. Experimentally, these proposed coil models achieve a sensitivity of 5.76 mV/A and a nonlinearity of 0.09%, which are better than their conventional counterparts. Apart from this, a mathematical analysis related to this work with different core materials and geometrical parameters confirms that these coils are also superior based on rise time, peak time, settling time, and sensitivity compared with their conventional counterparts. The dynamic precision adjustment device, made up of a brace-shaped Hall plate, utilizes novel materials, such as TiO2 and NiO, to make the device impedance more sensitive to control frequency and voltage. Experimentally, the impedance across the electron device varies between 0.0153 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{M}\Omega $ </tex-math></inline-formula> and 0.387 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{M}\Omega $ </tex-math></inline-formula> for every change in voltage and frequency in MHz of the switched mode control signal. This impedance-sensitive characteristic makes the output of the proposed sensor more efficient in achieving dynamic precision control even at a small range of operating conditions.