Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: PW60 In-car regulation

  1. #1
    Constant Bitrate will_santana's Avatar
    Join Date
    Mar 2007
    Location
    Rio de Janeiro/Brasil
    Posts
    186

    PW60 In-car regulation

    Hi, guys!

    It's my first post here and I'll use it to share my happiness and ask 1 question.

    Fist of all, forgive my english, but we talk portuguese down here in Brazil!

    It's 8 years now I've started my carputer projetc. Yeah, EIGHT years. I saw mp3car.com born. At that time there wasn't epias, dc-dc PSUs and even LCDs was so rare (and expensive). I started with a PCChips M598LMR mobo and a 233mmx processor. But the project got stuck by the power. Nobreaks were so expensive too (or maybe my budget smaller :P).
    All that years passed and I've got a M810 with a Duron850 and a 600va nobreak. But got stuck with the LCD.

    Now, FINALLY I've found (and bought) an EPIA 800 and a PW60 as well. I was happy as hell once this stuff are so rare or so expensive here because the hi taxes (60% import fee over the produtc PLUS shipping).
    The two cost me something about 150US$!!
    Got a 8'' VGA-in LCD with built in TV-Tunner for another 150US$. Unfortunately no touch screen again because the cost (the only one I've found was about 550US$).

    So I started to play with the stuff. I know Epia 800 is a little poor on maths and video playing is hard to get, but I've got it running divx, and even dvd with no problems after some config and with the appropriate software.
    You'd say to get a Neemiah or something like that, but there is no way of doing that. They are not sold in here, and importing costs more than double the price you pay in your countries and our money is about 0.50US$ per R$1,00 so it makes it FOUR times more expensive than it's for you.
    I'm SO happy I've found ANY Epia here for a ressonable price.

    The PSU runs fine from a wall brick I have (modded AC PSU), but it's my love and pain. I've been reading all over internet (and mp3car foruns as well) that PW60 is not regulated (nor wide input).
    I'de love to have a M2 PSU, but can't find it and impoting stuff you already know

    So, the question is: There's any single way to regulate the car DC current to make it 12V constant? My Opel Tigra runs 14.1V with engine running and as low as 8V on engine start.
    I've tought of using 5 ou 6 7812 linear regulators (1A each) in parallel to do the job with the engine on. Step up for undervoltage is fine too, once I'd love to be capable of using the computer with the car turned off too.

    Thanks for the audience who had the patience to read all this :P
    heheheh

    Any help would be apreciatted (specially a free M2 PSU :P)

    []s

  2. #2
    Constant Bitrate will_santana's Avatar
    Join Date
    Mar 2007
    Location
    Rio de Janeiro/Brasil
    Posts
    186

    PW60 In-car Regulation

    Damn... I wish it wasn't my first post

    I've wrote on before this, and it was huuuuuge. Took me 30min to write it. So the session expired and it's almost 2am down here in Brazil and I can't write it all again.
    So, forgive me but I'll start posting with a question:

    "There's any easy way to regulate the DC input of a car to a PW60 PSU?"

    It's impossible to change the PSU for another one once even PW60 was a real miracle to find here, and import costs makes things in here FOUR times expensivier than in USA ou Europe.
    I've tought of using 5 or 6 LM7812 voltage regulators to do the job with the engine on. Will it handle the job? There's any easy shchematic for something with step-up too? (using the carputer with the engine off would be SO fine)

    Any help would be REALLY appreciated (especially a M2 PSU :P)

    []s from Brazil!

  3. #3
    Variable Bitrate
    Join Date
    Jan 2007
    Location
    Szeged, Hungary
    Posts
    293
    Hello,

    I am confused about this. So, you already have a device called PW60 and you want to power it with 12V?

    or

    You just want to feed your computer regardless the state of engine with 12,5,3.3V respectively and the total power is 60W?

    In latter case I can help you perhaps, because I have built my own PS, because the small budget...
    Nothing special, one setpup for 12V and 3 stepdown for 5V,5Vsb,3.3V
    I used LM2679 5A variable output types.

    In first case you can use 7812, but select a more powerful one, for 2A. Care the heat dissipation...
    If you want to build a step-up for 12V/5A, that is more difficult, but not impossible.

    Have you got possibility to have a notebook adapter for 15V and after applying the 7812s?

  4. #4
    Neither darque nor pervert DarquePervert's Avatar
    Join Date
    Apr 2004
    Location
    Elsewhere
    Posts
    13,949
    Quote Originally Posted by will_santana View Post
    "There's any easy way to regulate the DC input of a car to a PW60 PSU?"
    Carnetix P1260

    And I merged your threads. You're subject to the newbie moderation that's supposed to be helping reduce spam.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  5. #5
    Constant Bitrate will_santana's Avatar
    Join Date
    Mar 2007
    Location
    Rio de Janeiro/Brasil
    Posts
    186
    thanks for the replies

    As you can see in the second post, the system has shown a error message after I tried to post the fist one and I posted the 2nd smaller one

    PW60 is a 12V unregulated PSU, bbslazs. The problems with it is handling he higher voltage with the engine on (once it don't regulate the 12v line) and dealing with the voltage drop of the batery after some time of use

    I'll follow your link, darquepervert and thanks for mergin the posts and excuseme for double posting (I'm administrator of the Tigra Clube Brasil forum and know how hard it is to keep things in order)

    []s

  6. #6
    Variable Bitrate
    Join Date
    Jan 2007
    Location
    Szeged, Hungary
    Posts
    293
    I think in this case there are two opportunities:

    1. Using a DC-AC inverter and then an AC PC PSU. It is noisy, but quite simple (You transform the voltage into 220/110 and then use a simple old ATX unit.)

    2. Make a unique power supply specially for EPIA and forget that 60W gadget.
    You can use stepdown converters for 3.3 and 5V, without any problem. Fine and simple.
    For 12V it is a little bit tricky, because the voltage varies between 8-15V.
    I suggest to convert the voltage up to 15V with a simple setp-up and then use those 7812. An epia just needs some hundred milliamperes of 12V...

    Too many 'simple's...oh, sancta simplicitas

  7. #7
    Constant Bitrate will_santana's Avatar
    Join Date
    Mar 2007
    Location
    Rio de Janeiro/Brasil
    Posts
    186
    nice trick, bbalazs!!!
    any glues on step up ICs?
    I got some MAX787 and MAX788 from my antique project of buiding a Sproggy PSU. But once more, the stepup portion of the PSU was the problem

    I thougt of regulating the 12v line BEFORE the PW60 PSU, so I don't have to worry with the other voltages. Even that it cost me to build a powerfull regulator. Or maybe regulate just the 12V rail and leave the PSU handle the rest once it can deal with the 8v voltage drop.

    []s

  8. #8
    Variable Bitrate
    Join Date
    Jan 2007
    Location
    Szeged, Hungary
    Posts
    293
    There is something must be wrong, I have tried this to send third time...


  9. #9
    FLAC evandude's Avatar
    Join Date
    Mar 2005
    Location
    Maine
    Posts
    937
    by the way, one thing you might find useful:
    http://www.mp3car.com/vbulletin/powe...ing-pw200.html
    That's a short guide on how I modified a PW-200 to split the 12v input into two different ones - one which feeds the 12v rail, and one which feeds all the other regulation sections (5v, 3.3v, etc). This means if you use an external 12v regulator to regulate the 12v rail, it only needs to drive the 12v rail, not the whole PC - you can feed the rest of the regulation sections with a regular unregulated 12v line. I would assume that a similar modification would be possible for your PW-60, if you decide to stay with it. The board I tested it with in the thread was an epia 800, and as you can see it reduced the load on the regulated 12v rail significantly.
    But don't take it from me! here's a quote from a real, live newbie:
    Quote Originally Posted by Viscouse
    I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
    eegeek.net

  10. #10
    Constant Bitrate will_santana's Avatar
    Join Date
    Mar 2007
    Location
    Rio de Janeiro/Brasil
    Posts
    186
    guys, thanks A LOT!!!

    it's PERFECT and exactly what I need
    I'll start studing the PW60 input to know where to cut the things. And with the bbalazss or evandude's designs of step-up regulators, I think it can be done

    let me as one more question for each one:

    evandude, in your mod on PW200, you use the regulated 12v source to feed ALL the PSU's lines or just the 12v line as u sugested?
    I'm planning to regulate just the 12v line as you said and leave the PW60 do the rest with the unregulated input.
    Just thinkin that in that case I should put the regulator AFTER the switch IC, so the regulator input would be the IC's output. Or is it better regulate the IC's input as you did and sync the power up of the both boards (PSU and Regulator) using the same power on switch?

    bbalazss, The IC you're using is the TL949, right? And that withe thing just beside it? Is that a trimpot?

    []s and thanks once more. U guys rulez!

Page 1 of 2 12 LastLast

Similar Threads

  1. FAQ: Why not Home PC speakers for the car?
    By RedGTiVR6 in forum The FAQ Emporium
    Replies: 25
    Last Post: 03-08-2010, 08:44 PM
  2. What's your dream car?
    By Aaron Cake in forum Off Topic
    Replies: 172
    Last Post: 10-02-2007, 07:34 AM
  3. In a real PC car struggle
    By markland556 in forum Off Topic
    Replies: 10
    Last Post: 06-27-2007, 11:36 AM
  4. Employee Discounted Cars: Flatout BIG LIE!
    By sdashiki in forum Off Topic
    Replies: 33
    Last Post: 10-31-2005, 05:53 PM
  5. Car PC EZ 2.4 SDC/Inverter Controller - NOW Avail!
    By hd54321 in forum Power Supplies
    Replies: 1
    Last Post: 02-24-2005, 12:42 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •