Offset Error reduction in Open Loop Hall Effect Current Sensors Powered with Single Voltage Source

For precise current measurement with Open Loop Hall Effect current sensors, zero offset error is problematic. With double voltage supplies, this offset can be adjusted near to zero. However for sensors powered with a single voltage supply, a remarkable amount of voltage offset still remains. This undesired rest offset causes inaccuracy in most applications. In this paper a novel method is proposed to minimize voltage offset error of Open Loop Hall Effect Current sensors powered with single voltage supply. Experiment results show that the offset error of current sensors under using the proposed method can be controlled within 0.2% so that the measuring accuracy of 0.5% is realizable for open loop current sensors.