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A
Aditech
Associate
May 15, 2026
Question

Requirement for Current Measurement Circuits

  • May 15, 2026
  • 3 replies
  • 174 views

Hello Team,

We need to interface a CT with a microcontroller for current measurement. The required measurement range is 0.01 A to 60 A with a 10 mA resolution.

Please find the attached block diagram for better understanding. We require the reference circuit for the blue highlighted section.

Awaiting your response soon.

Thank you in advance.

Image placed in line for easier viewing:

 

AndrewNeil_0-1778844464226.png

 

3 replies

Andrew Neil
Andrew Neil
Super User
May 15, 2026

ST's power metering range is here: 

https://www.st.com/en/data-converters/metering-ics.html

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
A
AditechAuthor
Associate
May 21, 2026

Hello Team,

As discussed earlier, we are working on the current measurement application and require your valuable suggestion for the same.

Our current measurement requirement is from 0.01 A to 60 A.

The required measurement accuracy/resolution is 10 mA.

Kindly suggest which CT will be suitable for this application.

Please also suggest the required CT turns ratio for accurate measurement up to 60 A.

Additionally, we also require separate leakage current measurement/detection in the system.

Kindly suggest the suitable approach or recommended solution for leakage current measurement as well.

Please share any suitable reference design, application note, or recommended circuit if available.

Looking forward to your response soon.

Andrew Neil
Andrew Neil
Super User
May 21, 2026

Does this have anything to do with ST ?

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Uwe Bonnes
    Uwe Bonnes
    Chief
    May 15, 2026

    Look for "Energy Measurement ADCs", e.g. at Analog devices

      Andrew Neil
      Andrew Neil
      Super User
      May 15, 2026
      @Aditech wrote:

      We need to interface a CT with a microcontroller for current measurement.

      Just for current measurement, or do you also want to determine energy and/or power, etc ?

      Try searches like "Current Transformer CT ADC" or "Current Transformer CT microcontroller", etc, in your favourite internet search engine or AI assistant; eg,

      https://www.google.com/search?q=CT+current+transformer+ADC

      https://www.google.com/search?q=CT+current+transformer+microcontroller 

       

      PS:

      Also, does the measurement have to be by current transformer?

      Other options are available ...

      A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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