An Online, Self-Contained, Method to Correct Current Sensor Gain Mismatch and Offset Errors in Three-Phase Drive Systems

This paper presents online methods to correct current sensor gain mismatch and offset errors in automotive-grade current sensors in a three-phase traction application motor drive system. These methods are self-contained such that no additional inputs (e.g., rotor position or dq-voltage commands) beyond the three-phase currents are necessary to perform the online compensation. Furthermore, the methods utilize integral control, instead of instantaneous current measurements, to reduce sensitivity to signal noise on the measured phase currents. The proposed methods are verified in simulation and experimental environments.