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Two power supplies, switched by loss of one

Discussion in 'General Electronics Discussion' started by mike sessi, Nov 5, 2016.

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  1. mike sessi

    mike sessi

    Feb 20, 2016
    Looking for, how to build, locate, create a solution
    The problem:
    I have many systems that need 12vdc at 6a.
    When the PS fails, someone needs to drive to this locate and swap out the PS, this could take a day or more

    The idea:
    Monitoring the PS(A) 12vdc out. If the 12v goes beyond threshold
    ..the relay turns off power to PS(A) turns on PS(B)
    Maybe a timer, wait 5 minutes before switching to PS(B)
    USB sends a "1" ( or stops sending a '0')

    Problem, when PS(A) fails, there is no power, other than 110vac
    Use a battery or capacitor to power the circuit ?
    When PS(B) is powered, 12v and/or USB 5v is available

    The system will notify that PC(A) not replaced when convenience.

    Last edited by a moderator: Nov 6, 2016
  2. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Why does the PSU fail? Fix that and that will save you time and money wont it.?
  3. Bluejets


    Oct 5, 2014
  4. mike sessi

    mike sessi

    Feb 20, 2016
    The P.S. has a life span of 3-5 years. These are off the shelve 12v/6A supplies.
    Yes, a better supply would last longer, and this is what they use. Yet, An IP power switch (110v) could work the shelve item
  5. mike sessi

    mike sessi

    Feb 20, 2016
    Idea...see image

    Attached Files:

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