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Feeding load with two 220V AC power supplies to reach uninterrupted power supply.

Discussion in 'Power Electronics' started by EEngineer93, Feb 28, 2021.

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  1. EEngineer93

    EEngineer93

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    Feb 28, 2021
    ee switch.jpg

    As shown in the diagram, I am trying to connect two power sources to load. The battery source is for emergency in the case of power outage of the wall source. I want the switching to be instantaneous with no interruption of power.

    What is the best solution to this problem? Is there a board out there that I could use? There must be no interruption of power.

    Thank you!

    Moderators note : uploaded picture and inserted into post
     
    Last edited by a moderator: Feb 28, 2021
  2. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Firstly . . . . . .EEngineer93 . . . . . .now REALLY ? and with its adjunct " 93 " ? that's indicative of a birth date of 1993 or actively "acting" as such since 1993 ?

    With a DUAL mandate of:
    I want the switching to be instantaneous with no interruption of power.
    There must be no interruption of power.


    You forgot the loads wattage and the . . . . .worst case . . . longest expected / experienced past power outage period

     
  3. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    What you are describing IS an uninterruptible power supply.
    There are many commercial versions available:
    uninterruptible power supply
    Depending on the load and running time, they can be vary in price.

    Bertus
     
  4. EEngineer93

    EEngineer93

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    Feb 28, 2021
    I don't know how that's relevant to my question but to satisfy your curiosity its the birth year of 1993.

    Load wattage = 300W
    longest expected outage = 2 hours

    Thank you.
     
  5. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    In that case, you need a 24V battery bank capable of 4 hours supply and a AC line powered charger, feeding into it to maintain a full / trickled state of charge .
    Then a 500 watt continuous duty rated inverter and your load kept plugged into the inverter . . . . .unless there is a time when the load will actually need to be turned off.
    Same condition as . . . . . . uninterruptible power supply
     
    EEngineer93 likes this.
  6. EEngineer93

    EEngineer93

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    Feb 28, 2021
    Thank you so much for your help!
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Jealousy. Some of us are so old that 1993 seems like last week.
     
  8. Kabelsalat

    Kabelsalat

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    Jul 5, 2011
    The problem I'd think look more like this:
    ee switch 2.png
     
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