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Smps input current measurment

Discussion in 'General Electronics Discussion' started by Mohan mrperfect, Mar 10, 2017.

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  1. Mohan mrperfect

    Mohan mrperfect

    Mar 10, 2017
    Hi all,
    This is Mohan,

    Actually i tried to measure input current of smps(3 phase input), to make smps automation circuit,we have used a 1 ohm resistor to the the series of all the three phases of smps ,normally when i measure in multimeter i saw 40mA at the smps input when i measure(voltage) across the 1 ohm resistor i got 0.04v so when i use formula I=V/R,im getting 40mA but i need to interface it with micro controller .

    Can anyone please suggest me a AC amplifier circuit ,with isolation .
    Please find the image to know my measurement place

    Attached Files:

  2. ramussons


    Jun 10, 2014
    A multimeter will give a acceptable reading only if the measurement quantity is a DC or a Pure Sine wave.

    You can use a AC / DC Hall Current Sensor Module using ACS712
    from eBay or Amazon to interface the microcontroller.

    Read about its functioning.
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