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power supply with long holding time

Discussion in 'General Electronics' started by Scott S, Jul 3, 2003.

  1. Scott S

    Scott S Guest

    I am looking for a 24V power supply (110V,60Hz AC input, 50-100W DC
    output) with a holding time of over 50ms. In other words, I need at
    least 18V DC at the output 50ms after the input power is gone.

    Does such a supply exist?

    Is there a way to rig a typical power supply to give it this feature
    without drastically increasing the footprint (like using huge
    capacitors).

    Thanks in advance,

    Scott S
     
  2. Robert Baer

    Robert Baer Guest

    You need some kind of energy resivour - either a capacitor or a
    battery.
    The battery could be inside a UPS driving the power supply.
    Available component energy densities limit either the space for a
    given output, or limit the output characteristic for a given volume.
    Perhaps more research into capacitors or batteries is in order, along
    with an acceptable tradeoff (or one that minimizes "problems").
     
  3. Run the power supply on a UPS. This is the best solution for you. Or,
    see if you can substantialy increase the size of the main electrolytic
    capacitors. You would have to work out the values, depending on the
    design of the supply, and the load characteristics.

    The power supply's input circuits will have to be able to support
    larger capacitors, and also you will have to have the physical space
    to mount them safely.

    Jerry Greenberg
    http://www.zoom-one.com
     
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