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AMC1304M25: Isolated Current Sensing for HVAC Applications

Matthew Olinde
Intellectual 1910 points
Part Number: AMC1304M25

To whom it may concern,

I am trying to put together a general proposal for HVAC controllers in the building automation space.  In the reference design we have on TI.com, for current sensing they recommend an isolated hall-effect sensor with an AFE to send the current sensing data to the MPU for the system.  Would it make sense to replace these couple of blocks with something like the AMC1304 for isolated current sensing?  What would be the drawback to integrating the solution in this way?

  • +1
    TI__Expert 8455 points

    Hi Matthew,

    Thank you for your question. Could you please link me to the reference design you are looking at? 

    Yes, you could use an isolated modulator instead of an isolated hall-effect sensor for some current sensing applications. Isolated modulators provide high-speed digital output that can be filtered externally. They typically measure current over a shunt resistor. Isolated hall-effect sensors can be used in a single-module approach and have a magnetic-core. 

    Overall, isolated modulators have higher accuracy, lower temperature drift, and are more suitable for applications dealing with high common-mode voltages. Hall-effect sensors generally have a lower cost, smaller package size, and are more suitable for applications that involve high-current sensing. 

    Deciding between the two devices would depend on the requirements of your application. 

    Please let me know if you have any more questions!

    Best regards,

    Eva

  • 0 in reply to Eva Mason
    TI__Intellectual 1910 points

    Hi Eva,

    I apologize, I was actually referring to the general EERD for HVAC controllers rather than a specific reference design. HVAC Controller EERD

    It looks like the typical voltages for this application are not very high (24Vac), so I am thinking the isolated modulator may be a bit overkill.  I appreciate the insight!

    Thank you,

    Matthew

  • 0 in reply to Matthew Olinde
    TI__Expert 8455 points

    Hi Matthew,

    Got it, glad I could help!

    Best regards,

    Eva