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preventing groundloops while handling a breaker with an mcu

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

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  1. vitroblue


    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
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