DC to DC Isolation

Discussion in 'General Electronics Chat' started by Fuzzy54, Aug 4, 2009.

  1. Fuzzy54

    Thread Starter Member

    Jun 9, 2006
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    How do DC to DC converter provide isolation? Do they really convert the DC input to AC and then use an isolation transformer, or is there a trick that I am missing.

    Basically I am trying to isolate 24V but this does not need to be regulated so I was hoping to save space by only using the isolation portion of a DC to DC converter.

    Any thoughts
     
  2. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    You got the idea right. There is a transformer so DC to AC transformer AC to DC
     
  3. pilko

    Senior Member

    Dec 8, 2008
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    Isolation may also be acheived using an opto coupler, depending on your application.
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
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  5. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    Depending on your power and input \ output voltage requirements you can obtain a quite small footprint off-the-shelf.

    For instance see this DC/DC converter series data sheet as an example. There would be equivalent alternatives from other manufacturers ...

    http://www.murata-ps.com/data/power/ncl/kdc_nmh.pdf
     
  6. Fuzzy54

    Thread Starter Member

    Jun 9, 2006
    11
    0
    I need an isolated power solution. I would just use a small DC to DC converter but they tend to get rather large for the 200 to 300W that I need.

    It seems that optocouplers are really just an isolated switch so say a micro controller could control a non isolated signal, correct?
     
  7. pilko

    Senior Member

    Dec 8, 2008
    213
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    Optocouplers come in many types. they can be AC or DC and can be used to couple/isolate analog or digital signals.
     
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