DC DC Converter Alternatives

Discussion in 'General Electronics Chat' started by Daniel - RoboNoob, May 26, 2009.

  1. Daniel - RoboNoob

    Thread Starter Member

    May 21, 2009
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    Hey Guys, I'm trying to create a DC-DC converter to go from around 5 V to 120 V. I would buy one, but my project is heavily price constrained. Does anyone have any advice on cheap alternatives (where to buy/schematics on how to make? I've found something called a chopper amplifier but I can't quite figure it out...

    Thanks all.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    What power should the DC-DC converter handle?

    Greetings,
    Bertus
     
  3. Daniel - RoboNoob

    Thread Starter Member

    May 21, 2009
    11
    0
    Thanks Bertus, I should've had that up originally. I'm looking for 120 W.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    You want a 120 Watt converter from 5 Volts input to 120 Volts output.
    If the output power is 120 Watts and the efficiency is 80 % you need 120 / 0.8 = 150 Watts input power.
    At 5 Volts that is 30 Amps.

    Are you sure about these requirements?

    Greetings,
    Bertus
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    You can buy a 100W inverter for less than $15 nowdays. It would be a snap to convert that back to DC. What kind of money are you looking to spend?
     
  6. sreejisreeni

    New Member

    May 27, 2009
    4
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    I DO AGREE WITH BILL.....
     
  7. radiohead

    Active Member

    May 28, 2009
    474
    31
    Try the VT-series DC single output DC-DC converter, available at Mouser Electronics for a little over $200. part number 618-VTD48SC12 at http://www.mouser.com/Search/Refine.aspx?Keyword=618-vtd48sc12
    you are going to have a tough time trying to find a converter that will go from 5 VDC to 120 VDC over 100W. Query manufacturers of DC-DC converters for a suitable unit. Here are a few manufacturers: Artesyn, Cincon, Ericsson, ETA-USA, Murata Power Solutions, Tyco Electronics Power Systems, and Vishay. Unless you have experience building high-voltage power supplies, I would advise you to purchase one instead of attempting to build one.
     
  8. Wendy

    Moderator

    Mar 24, 2008
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    He did mention price was an object. $200 is a lot of money to most folks.
     
  9. Daniel - RoboNoob

    Thread Starter Member

    May 21, 2009
    11
    0
    Sorry about that guys, boss gave me the wrong specs - 5 or 10 W would be great. Thanks for all of the responses everyone. Does anyone know any alternative/diy circuits?
     
  10. Wendy

    Moderator

    Mar 24, 2008
    20,764
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    A lot of what was said still applies. Have you looked for a cheap inverter in your area? There will still be plenty left over to build, but it will save a lot of work.

    To put it in perspective, 12W at 12V is 1A, at 120VAC it is 0.1A.
     
  11. radiohead

    Active Member

    May 28, 2009
    474
    31
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