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Thread: Help with powering a cr@p load of devices!

  1. #1
    Who am I? HiJackZX1's Avatar
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    Help with powering a cr@p load of devices!

    Finally decided to finish my install. Multizone and all.

    I bought 6 thin clients to act as the individual units for each seat. I was trying to wait for the Raspberry PI, but there is to much demand on the device. Since the rear seats do not need high end stuff, just the ability to listen to music video, and other miner things, I went with them. Each cost me $11.99 each. Each unit is 800mhz, 512mb RAM, and will each get a 4gb CF card for the OS (which have been purchased). I thought I would have issues with trying to power these units, but turns out that they are DC-DC power supplies. The seller said to basically fuse each PSU and connect to 12V power. So that is out of the way.

    I replaced all the crappy 7 port hubs I have, with hubs from a company call Inland. They work flawlessly now and I have no device connection errors. All are powered via car adapter chargers, but will soon be powered by a individual PSU (READ BELOW).

    Here is where I am having major issues. I have 7 KVMP switches. One for each seat, then two for the driver. One is used to switched the main screen from main driver screen to rear entertainment (that allowed me to eliminate the driver needing two screens). The issue is that the KVMP switches all require 5V at 2.6amps. They will not work correctly with anything lower, causing issues. What can i do to power these units? I basically need 18.20 amps to power them. Adding all other 5V devices, that brings me to 23.20 amps. Most car based PSUs do not support that load. My logic was to pull out an inverter I originally wanted to use, it was to power the original multizone system, which consisted of a massive system that had the ability to support multiple users. The inverter is 600 watts. Then I am going to connect a desktop PSU to it which 450watts with 34amps on the 5V rail. Then I can wire the KVMP switches into the 5V rail. The PSU I am looking at supports 5v @ 34amps. I was going to hack the desktop PSU so that when power is applied it just turns on, meaning a PC doesnt trigger it. Basically the Opus will trigger the inverter to turn on via relay.

    I think this idea is better because fusing so many devices (car chargers) is a huge pain. At least by using the desktop psu and inverter, it will all be regulated power. Does my idea seem sound? Anything I should look out for?
    Last edited by HiJackZX1; 07-05-2012 at 04:03 PM.
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  2. #2
    Variable Bitrate UnusuallyGenius's Avatar
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    Unrelated...what thin clients are you using?

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  3. #3
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by UnusuallyGenius View Post
    Unrelated...what thin clients are you using?

    Sent from my DROID RAZR using Tapatalk 2
    MaxSpeed Maxterm 8300B units. They basically are VIA based motherboards that come with XPe. Here is a picture of the inside. I cant seem to find much into on the boards, but I think they may be upgradable to 1GB of RAM. I am happy with 512, So that stays the same. Only thing I am changing are the CF cards, I am going from 512 to 4GB. All though my Windows XP nLite is small, Other programs like Centrafuse arent.

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    Gday,

    What about using some DC-DC conveerters. I am going to purchase one in a minute on fleabay.. converts 12v to 5v at 10amps.. They are hard wired without a switch so you may want to add one in.. For the load you require, you would need more than one, but they may be available with higher AMP rating..


    Ozzy.

  5. #5
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by Ozzyjim View Post
    Gday,

    What about using some DC-DC conveerters. I am going to purchase one in a minute on fleabay.. converts 12v to 5v at 10amps.. They are hard wired without a switch so you may want to add one in.. For the load you require, you would need more than one, but they may be available with higher AMP rating..


    Ozzy.
    Well if you look at the picture, you see that circuit at the top of the case? That is a DC-DC converter PSU. Problem is that it does not regulate, the brick did that for it. The gentle man said to simply fuse it, but I feel better doing it with the inverter.
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  6. #6
    Raw Wave
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    Quote Originally Posted by HiJackZX1 View Post
    That is a DC-DC converter PSU. Problem is that it does not regulate, the brick did that for it.
    Eh?

    You mean it's a DC-DC converter PSU and it does regulate, but it needs regulated DC input....???
    (So it's a PICO or similar that is NOT an automotive PSU?)


    That's where I'd replace the PSU.
    I can't see the point of using TWO (DC-DC) PSUs - though it is better than inverter to regulator to DC-DC PSU.


    And to "simply fuse it?". So he knew it was suitable for automotive applications and not merely "12V"?

  7. #7
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by OldSpark View Post
    Eh?

    You mean it's a DC-DC converter PSU and it does regulate, but it needs regulated DC input....???
    (So it's a PICO or similar that is NOT an automotive PSU?)


    That's where I'd replace the PSU.
    I can't see the point of using TWO (DC-DC) PSUs - though it is better than inverter to regulator to DC-DC PSU.


    And to "simply fuse it?". So he knew it was suitable for automotive applications and not merely "12V"?
    I dont think it regulates. He was telling me i could even use a 18v power brick. Well he says thats what most people buy them for.
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  8. #8
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    You reply is ambiguous.
    It must regulate its output. Otherwise it is nothing more than a power receptacle with maybe some filtering behind it.

    But if it handles an 18V brick, it must regulate its output, and it should handle automotive 12V ranges. The only exception might be high-voltage spikes (use MOVs or zeners etc) and maybe voltage dips (if not a dc-dc/SMPS internal PSU).

    If you want dc regulation, don't forget CurrentLogic's converters.

  9. #9
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by OldSpark View Post
    You reply is ambiguous.
    It must regulate its output. Otherwise it is nothing more than a power receptacle with maybe some filtering behind it.

    But if it handles an 18V brick, it must regulate its output, and it should handle automotive 12V ranges. The only exception might be high-voltage spikes (use MOVs or zeners etc) and maybe voltage dips (if not a dc-dc/SMPS internal PSU).

    If you want dc regulation, don't forget CurrentLogic's converters.
    LOL, I just noticed what I wrote. HAHAHAHAHA. You know when it comes to certain things, I'm kind of air headed because I dont feel like getting an understanding of it. Power stuff is one of them (as you can see). I guess, in a way, I just dont trust the psu units. Since I 100% have to power my KVMP switches with the AC adapters, I might as well power the thin clients with it also.

    I see I didnt update my first post on my intentions.

    UPDATE: I had a 600 watt inverter sitting in my garage from an old attempt to power my then, multizone PC. I decided to use the inverter because my KVMP switches use a 5V 2.6a adapter. The thing seems to be very sensitive and using anything lower than the specs causes the USB devices not to work correctly. Anything over 2.6 causes the KVMP switch to fry. Since the KVMP switches are fairly expensive, I do not want to damage them, so the easier thing to do was use the power brick that came with it and connect it to a power strip, then to my inverter. For the thin clients I bought Asus EEE power bricks. They are so tiny and compact, that they fit away inside the thin clients case. I then plug those into another power strip and I'm done. When the inverter is powered up by my pain PC, it activates the inverter and sends power to the thin clients. All thin clients will be set to power on when power is applied. I have modded the power strip for the thin clients so now the switch on the strip is extended to the driver. If i do not want to use multizone, then I turn off the switch.
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  10. #10
    Constant Bitrate
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    Do you have a project thread for this? It definitely sounds like a pretty insane idea that I would be interested reading more about.
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