A linearisation method for commercial Hall-Effect current transducers

Abstract

The need for high-current transducers featuring wide band and high-insulation levels is becoming a more and more impelling need, in the electric power network, as the current distortion increases, due to the proliferation of non-linear, time-variant loads. The Hall-effect current transducers show a good compromise between cost and metrological performance. On the other hand, they may introduce an unacceptable non-linearity error when the input current dynamics is a reduced portion of the transducer full-scale dynamics, and show a large drifr of their gain with temperature. The paper proposes a simple method for reduction of the non-linearity error when the input signal is an unbiased sinewave and the automatic calibration of the gain. Experimental results are also reported, showing the method effectiveness.

Optimal design of dual air-gap closed-loop TMR current sensor based on minimum magnetic field uniformity coefficient

“…Hall-effect sensor has been around for decades and widely applied. However, Hall-effect sensor has inherent defects, such as weak sensitivity, low linearity but temperature sensitive 3,4 . The fourth-generation magnetic sensing element TMR has advanced characteristics in sensitivity, power consumption and temperature characters [5][6][7] .…”