Analysis and adjust of temperature drift in current measurement based on hall sensor

Aiming at the temperature drift of the output voltage of hall sensor, according to the input-output relationship of sensor, by using the method of theoretical derivation and analysis, influence degree of each element on the output voltage of sensor with change of temperature can be obtained. It can be found the product sensitivity of the hall current sensor has the greatest influence on the output voltage of the sensor with the change of temperature, and the relative error can reach 123.7%. At the same time, a cubic linear interpolation correction method is proposed to reduce the error in measurement. The experiments show that the relative measurement error of the sensor is reduced from 12.4% to 4.3%, which greatly improves the measurement accuracy of the sensor.