A SYSTEM FOR CONTINUOUS CALIBRATION OF HALL SENSORS

• Main Authors: TRIFONOV DIMITAR, TSAI CHENG-HSIUNG, BASU PARTHA, LARSON TONY
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2021
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

A system (400) comprises a calibration current generator (280), which provides a calibration current to a first and a second Hall channel (214; 218), and a bias current generator (470), which determines a difference between a calibration signal from the Hall channels and a threshold and adjusts a biasing current for the Hall channels based on the difference. In some embodiments, the bias current generator comprises a subtractor (410) coupled to an ADC (420) and a controller (440) coupled between the ADC and a DAC (450). The subtractor obtains a first and a second signal from the first and second Hall channels, respectively, and subtracts the first from the second to obtain the calibration signal (415). The controller determines the difference between a sampled signal from the ADC and the threshold and an adjustment to the biasing current based on the difference. The DAC adjusts the biasing current based on a control signal (445) from the controller indicating the adjustment. 本发明揭示一种系统(400)，其包括：校准电流产生器(280)，其向