Absolute Value Current Sense Amplifier Circuit?

[hal9001]

Is there a current sense op amp circuit to output the absolute value of the current in terms of positive volts. In other words even if current direction changes I want to know how much current is going through a current shunt but dont care about direction.

Cheers!

[StillTrying]

You could connect 2 of the constant current outputs to the same output resistor.

[Terry Bites]

You need a current monitor and a simple absolute value circuit. Many RIRO precision opamps will work.
The current sensing method you need depends on the current, system voltage and frequency. .
A simple method would be to use a high CMV differential amplifier (which you can home brew with loss of accuracy). This IC will work on a 120V RMS AC system

[hal9001]

You could connect 2 of the constant current outputs to the same output resistor.

You need a current monitor and a simple absolute value circuit. (Attachment Link) Many RIRO precision opamps will work.
The current sensing method you need depends on the current, system voltage and frequency. (Attachment Link) .
A simple method would be to use a high CMV differential amplifier (which you can home brew with loss of accuracy). This IC will work on a 120V RMS AC system (Attachment Link)

Thanks!

[Terry Bites]

You are so right.


There are exotic and more precise expensive versions I looked at before the penny dropped.
https://www.analog.com/en/app-notes/an-105fa.htmlF   (page 28) well worth a full read.
Bidirectional Absolute Value Current Sense using LTC6101 or LTC6102.
See https://www.analog.com/media/en/technical-documentation/data-sheets/ltc6101.pdf page 18 on boosting operating voltage if you need to.
Or https://www.analog.com/media/en/technical-documentation/data-sheets/6102fe.pdf