Connect with us

preventing groundloops while handling a breaker with an mcu

Discussion in 'General Electronics Discussion' started by vitroblue, Jan 4, 2013.

Scroll to continue with content
  1. vitroblue

    vitroblue

    4
    0
    Jan 2, 2013
    i want to turn on a machine (i dont quite know what it is) on a 5V mcu signal

    but i have two boards... three boards

    1) power supply
    2) mcu board
    3) "power interface"

    so the power supply has 5V for my mcu board and 12V for the "power interface"

    the "power interface" has a transistor to drive a relay which handles the 220V breaker coil (resistors and diodes included). that part seems fine

    but if i drive the transistor directly from the mcu board i believe i'm gonna cause a ground loop

    that's why i want to place an optocoupler, to isolate one board from the other and have only the power supply ground as reference

    but once i have it, the optocoupler transistor driving the relay transistor will look like a darlington array. is that ok or should i remove the transistor driving the relay?



    thank you
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-