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24V switching PSU?

Discussion in 'Electronic Design' started by Dirk Bruere at Neopax, Oct 10, 2005.

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  1. Rated around 500W and which is cheap?

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  2. Production items.
    So, how come 400W PC PSUs are so cheap and a 24V PSU isn't?

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  3. Ian Stirling

    Ian Stirling Guest

    Volume.
    Order a million 24V 400W PSUs and you can probably get them for $15(us).

    The cheapest way is probably 2 cheap PC power supplies, and 2 big diodes
    in case they get shorted.
     
  4. Guest

    Check with Jameco; they have a reasonable selection of higher-powered
    switchers. I was looking for a 3.3 V, 20+ A supply yesterday and they
    had a couple around US$80 quantity 1. The parametric search on their
    Web site is fairly useless; download the PDF catalog and flip through
    the power supply pages.

    Matt Roberds
     
  5. That's 66W. The OP wanted 500.

    robert
     
  6. Carl Ijames

    Carl Ijames Guest

    We buy lower power, 150W 24V switchers from www.astrodyne.com and they
    have been very reliable and ship when they say they will. Their
    sp500-24 is 500W at 24V, enclosed, with power factor correction for $260
    qty 1.
     
  7. Guest

    My mistake; you're right. I was thinking about some bigger supplies
    that I was also looking up at Jameco yesterday. They do have ones that
    big, but a 24 V, 25 A supply starts at $174/1 and gets worse from there.

    Matt Roberds
     
  8. I'm starting to think that a big fat transformer and some fat caps are going to
    be the cheap way to go. I don't need super regulated PS.

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  9. Ken Smith

    Ken Smith Guest

    If nothing else is at issue, this usually is the lowest cost way to go.
     
  10. Rich Grise

    Rich Grise Guest

    Battery charger. I used to work for these guys: http://www.bycan.com .
    Their website is being upgraded, so you'd have to call them (818) 886-
    2273. They wind their own ferroresonant transformers. Another thought is
    an aircraft ground power supply, which is nominally 28V, but all they'd
    have to do to make one for 24 is leave a couple of windings off the
    secondary of their transformer. The APUs have a BMF capacitor - a
    battery charger would have nasty ripple.

    If you call them, tell them Rich Gryce sent you. ;-)

    Good Luck!
    Rich
     
  11. Ian Stirling

    Ian Stirling Guest

    Can one get 500W of transformer, plus large caps, for the price of 2
    PC power supplies?
     
  12. I read in sci.electronics.design that Ian Stirling
    Can you get 500 W at 24 V out of two PC power supplies? The 12 V outputs
    are usually fairly low power compared with the 5 V outputs.
     
  13. Well, since I intend to use it to drive some 200W 24V DC motors a bit of ripple
    won't matter. BTW, I really dislike sites that don't have prices.

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  14. Carl Ijames

    Carl Ijames Guest

    We buy lower power, 150W 24V switchers from www.astrodyne.com and
    Hope you weren't referring to astrodyne, since their website does have
    pricing. They also have a 225W open frame unit for $125 qty 1 if you
    wanted to use one psu per motor :). They only have the 500W version as
    an enclosed unit, not open frame. We were looking at powering a
    brushless dc motor a while back, and at 24V and about 75 W an open frame
    switcher from astrodyne was cheaper than I could find a power
    transformer, bridge, and caps. Good luck with your search.
     
  15. Rich Grise

    Rich Grise Guest

    Notwithstanding stacking PC power supplies is probably not a really
    exceptionally great idea. :)

    Cheers!
    Rich
     
  16. Not true anymore. The processors are powered off the +12V supply
    output (the ATX-12V and EPS-12V specs). That's were the real power
    is (500W is a little high though).

    Here is one with 440W (20A) on the +12V output:

    http://www.newegg.com/Product/Product.asp?Item=N82E16817163028
     
  17. I can believe it, now.
    Today I held in my hand a 1000W RMS amplifier that was less than half the size
    of a PC PSU. Cost around $400.

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  18. I read in sci.electronics.design that Dirk Bruere at Neopax
    No, you didn't. Watts are NEVER RMS; RMS is a property of 'field
    quantities' such as voltage and current.
     
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