太白金星

Contactless, precision AC current sensing using Hall Effect sensors

TIDA-00218

 
Overview

This TI design uses Hall sensing technology from Texas Instruments (TI) to provide a solution for understanding the AC current flowing through a wire without any physical intervention. The TIDA-00218 uses a flux concentrator to concentrate the magnetic flux around the AC current-carrying wire without allowing it to escape into the air, and then directs this magnetic flux to the Hall sensor.

characteristic
  • ● Non-contact proximity current sensing suitable for AC three-phase input current
  • ● Maximum measurement error from 1A to 10A rms is less than 5%
  • ● The flux concentrator described in this design increases flux density by a factor of 6 (15 dB)
  • ● Only perform single-point gain correction in the maximum current range; implement second-order curve fitting in firmware
  • ● The maximum current that can be sensed can be adjusted by changing the flux concentrator design

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