Part Number: INA250
Has anyone tried using the INA250 in a lines powered AC application to monitor the current on the Neutral conductor?
Obviously the INA250 would have to be configured for bidirectional operation.
Carlos S., TI Sensing Products, Applications Support
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In reply to Carlos Silva85:
Also, according to the data sheet, the recommended continuous max current is +/- 15A.
Some UL/IEC/ANSI specs that guide the design of this product in question requires testing with surge currents up to 45A.
The test is 50 reps of 1 sec surge and 9 sec cool down.
What comments can you provide on the surge tolerance of the INA250?
This would potentially be used in a billing grade energy meter.
In reply to Steven Dunbar:
Do you require the surge current to be within the linear region of the amplifier or do you only require it to withstand such transients?
45Amps is a little bit too much for our device. I am also concerned what would happen under a short circuit condition, when line peak currents exceed 100A for a short duration before the circuit breaker trips.
I would suggest using an external sense resistor that could be sized to cope with all these variables for design robustness.
As to the current readings, AC is fine as described above.
With the grounded reference there seems to be some discontinuity on the start of the waveform, but otherwise as expected
With the reference at 1/2VS and VS = 5.0V
The plots are a 18Ohm load in a 12VAC supply, differential measurement, INA250-A2.
Further to my posts above, I would like to make you aware of TI design TIDA-00753 which uses a current transformer for high-accuracy, wide-range AC current measurements and seems ideal for your requirements.
Please let me know should you require further assistance.
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