Real life issues (not this project)

A project log for Isolated +-50 A current sensor

Very simple +-50 A isolated current sensor with 1.5 MHz bandwidth based on Anisotropic Magneto Resistive sensor technology (MCA1101-50-3).

kevarekkevarek 09/22/2020 at 04:480 Comments

Here are few issues which you may experience when using AMR current sensors. The biggest challenge is that they seem to be so perfect in static conditions but when under heavy load many errors may add to real signal which typically leads to complete malfunction or worse sporadic malfunction/destruction of the whole device. See below my experience from another project.

Signal Id offset error(Id current - grey - signal shifted in amplitudes)

Id current saturation error

Id current seemingly OK after a small piece of soft magnetic steel has been placed on top of the integrated circuit. But check the -2 A offset error when no current is which is caused by the residual magnetization of this new shield.