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I need a current detector that outputs a logic signal (1 or 0). I DON'T need to measure current.

  • Detected current: AC.
  • Voltage: 220V.
  • Load power: ~1kW.

FOR EXAMPLE: I need a current detector that will give out + 5V at a current greater than 0.15A, if the current is less than 0.15A, then the output is 0V (adjust the threshold with a trimmer resistor).

I think that an optocoupler and some kind of transformer current sensor (for example ZMCT103) could be used for this. It is advisable not to use additional power from the LED side (which is located in the optocoupler).

Do you have any thoughts and solutions?

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  • \$\begingroup\$ Why do you want to use an optocoupler? A transformer can already provide safety isolation. \$\endgroup\$
    – The Photon
    Commented Apr 16, 2023 at 14:36
  • \$\begingroup\$ @ThePhoton Nobody canceled power surges. And if you look at the SCT-013-000 datasheet , you can find a built-in TVS diode there. I need to signal the presence of a certain level of current to a microcontroller 24/7 that will be connected to the computer via usb. It's better to have extra security than not to have it. Paranoia:D (joke). \$\endgroup\$
    – Mia
    Commented Apr 16, 2023 at 14:51
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    \$\begingroup\$ What would an optocoupler do for power surges? Maybe share your proposed circuit to make it more clear? \$\endgroup\$
    – The Photon
    Commented Apr 16, 2023 at 15:02
  • \$\begingroup\$ @ThePhoton The optocoupler could have failed instead of the microcontroller. \$\endgroup\$
    – Mia
    Commented Apr 16, 2023 at 15:35
  • \$\begingroup\$ @ThePhoton i.postimg.cc/rsRwPYwr/image.png I'm a beginner, so don't be scared. Most likely this is not a working scheme, but just a presentation of an idea. \$\endgroup\$
    – Mia
    Commented Apr 16, 2023 at 16:14

1 Answer 1

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You know, they make ready-made products that do that. No need to reinvent the wheel. They are used to turn on the blower next to a circular saw to suck out the dust.

https://www.amazon.com/Current-Sensing-Normally-Adjustable-SZC23-NO-AL-CH/dp/B07P87TG8F

https://www.walmart.com/c/kp/current-sensor-switch

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    \$\begingroup\$ This solution takes up a lot of space. I need a compact solution. That's why, I began to look for small transformer current sensors. But thanks for answering my question. You prompted me to further search for the query "Current Sensing Switch". \$\endgroup\$
    – Mia
    Commented Apr 16, 2023 at 14:18

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