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Thread: Anyone try a Forward Converter?

  1. #41
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    Originally posted by marsjell:
    <STRONG>

    do you mean the difference between the +12V and the -12V... I really hope so, I just tought I was starting to understand everything and than I read this....</STRONG>
    Actually I was talking about the back EMF from the primary windings. When the primary windings are turned off, they have a voltage spike that is 2x the battery voltage. I'm actually not certain if my MicroATX supply has -12V...

    Presslab

  2. #42
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    Okay, here is the schematic, added to the PhotoPoint album. Post comments in this forum.

    Presslab

    Schematic Files

  3. #43
    Maximum Bitrate
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    PressLab that looks intresting!
    I'll give that a try this week when i get some free time.
    For quick reference can you please tell me part numbers for the D1,D2,D3. Just want to know what you used.
    Thanks
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  4. #44
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    Originally posted by Fosgate:
    <STRONG>PressLab that looks intresting!
    I'll give that a try this week when i get some free time.
    For quick reference can you please tell me part numbers for the D1,D2,D3. Just want to know what you used.
    Thanks</STRONG>
    D1 is a BYV32E. D2 are two SMBJ28A in parallel. D3 is a MBR745. The reason no part numbers are listed, is that those three devices are not the optimum parts. They are just what I had in my junk box.

    Anything with a similar operation to the above parts will work, and actually the parts used are overkill. If you'd like you could use the same parts.

    Presslab

  5. #45
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    Question

    press i know i could do the electronics in this but i'm not sure about winding the trransformer is there any way that you could do the transformer and sell it as a kit if you have the time
    You gave me fortune, You gave me fame
    You me power in your God's name
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    I'm the Cult of Personality

  6. #46
    Variable Bitrate
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    Question

    Hi PressLab,

    thanks for you schematic, it's a big help, but what I still don't understand is the transformer part, the winding-stuff. In the pic you put up it says 3 turns, 2 strands (x3 on the primary site) and, just to pick one, 4 turns & 3 strand on the secondary site.
    first: is the number of turns a ratio? as it would seem to me that only 3 turns would create a short circuit?
    second: what is "3 strand"?

    ohw noticed something else :
    in one of your earlier posts you mentioned "National Semi. LM2671M-ADJ " but I can't find it in your schematic?

    thanx & keep up the excellent work!

    [ 08-17-2001: Message edted by: marsjell ]

    [ 08-19-2001: Message edited by: marsjell ]
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  7. #47
    Variable Bitrate
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    Question

    I was just wondering if anybody got a psu working the way presslab describes it?
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  8. #48
    Maximum Bitrate Raas's Avatar
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    Yeah.. me too...

    I would like to do this, but don't exactly know where to start..

    Maybe, someone (who managed to 'convert' their PS) is able to put a web site toghether along with some pictures exactly describing what to do...
    (I volunteer in Making a site for this if someone could make pictures, and a 'manual' on how to do this..)

    Greetz

    Raas
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
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  9. #49
    FLAC
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    Red face

    Same here, this is the only REASON i havent started on the next box for customers or what not. Someone (**cough**) PressLab, Jeff...needs to have a site, step by step for all we wannabe electronic guys on what to do, i just hope we don't get electricuted doing it though
    abcd-1
    Author of CobraI,II,III and now CobraIV.
    You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

  10. #50
    Constant Bitrate
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    Charles,
    if it is for a customer, have them pay for a real power supply.

    I would not take the chance of a vehicle fire/totalling of a customer's car and the later lawsuit when you could charge him $200 more up front and buy an approved power supply.

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