Contactless AC-Current Sensing Using a Hall Effect Sensor


Design files


This reference design uses our hall sensing technology to determine the amount of AC current flowing through a wire without any physical intervention. TIDA-00218 implements a flux concentrator to concentrate the flux around the AC-current carrying wire, rather than letting it escape in air, and then directing that flux to a hall sensor.

  • Contactless proximity current sensing for AC and 3-phase input currents
  • Maximum measured error less than 5% from 1-A to 10-A rms
  • Flux concentrator as described in this design improves the magnetic flux density by a factor of six (15 dB)
  • Only single-point gain correction at maximum current range; second-order curve fit implemented in firmware
  • Maximum current that is sensed can be adapted by changing the flux concentrator design
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDRB30.PDF (169 K)

Detailed schematic diagram for design layout and components

TIDRB31.PDF (49 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRB32.PDF (291 K)

Detailed overview of design layout for component placement

TIDRB34.ZIP (1118 K)

Files used for 3D models or 2D drawings of IC components

TIDC687.ZIP (397 K)

Design file that contains information on physical board layer of design PCB

TIDRB33.PDF (1859 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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* User guide Contactless AC-Current Sensing Using a Hall Effect Sensor Reference Design (Rev. A) Feb. 25, 2015

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