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Thread: 14.5V = No Go for pw120?

  1. #1
    Raw Wave wizardPC's Avatar
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    Angry 14.5V = No Go for pw120?

    My carputer works great, as long as the engine isnt running. The only thing different about my car when the engine is running is that the line that goes to my pw120 gets 14.5v instead of 12.7 when the engine is off.

    I couldnt find any references to other people having similar problems.

    I have had nothing but trouble with this setup this week, and I thought I had finally gotten everything working. Then I started my car and the PC died (which I thought was odd seeing as it is run off a second battery that is not involved in the starting process). I couldnt get the pc to start again until I turned off the car.

    ARG!

    Any suggestions?
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  2. #2
    Maximum Bitrate starfox's Avatar
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    While the car's running your altenator is powering the car electrical system. The altenator will supply ~14.4V which is enough to charge your car battery. There's a device called an ITPS which you can search for which is a low dropout regulator which might help to keep the voltage from jumping up too high (search and read, as running an ITPS is kinda a double edged sword).

    Car and PC died means your car stalled and your pc wouldn't boot up? Or something else happened? If you're running a battery management system or charging circuit for your second battery i'd go check your car electrical system, might have a loose ground connection or something...

  3. #3
    Raw Wave wizardPC's Avatar
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    There are many problems with the ITPS, chief among them being the fact that it can only supply 60watts. Oh that reminds me I havent ever given any specs for this machine.
    This is what is running right now:

    Epia M10000
    512MB Micron DDR266
    30GB Toshiba laptop drive
    Eluminix USB Keyboard
    Lilliput USB Touchscreen
    Deluo USB GPS
    Orinoco USB Gold Client
    All powered by a PW-120

    apparently, many people have been able to get away without any regulation by using laptop components, so thats what I did. The fact that I have so many USB devices means that I cant (or at least shouldnt) use the ITPS due to its relatively low output.
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  4. #4
    FLAC shakes's Avatar
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    wizard ... someone will have to double check me but i'm pretty sure the PW series supplies will take a max of 14v ...

    so if you're giving it 14.5 the safety feature of it may be kicking in and turning the supply off.

    stick a diode or something in there to get the voltage below 14 and se if it lives.
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  5. #5
    Raw Wave wizardPC's Avatar
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    I have a potentiometer laying around here somewhere, I'll stick that on the power line and get it to 14v (with a multimeter first, of course) in the morning.

    I'm gonna go to sleep now and try this in about 9 or 10 hours. I'll check here first to see if anyone else has come up with anything for me to try, or to tell me that putting a pot on the line is a bad idea.
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  6. #6
    Newbie
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    Hi
    Be careful with the potentiometer, because the current that goes to your psu will also go through the potentiometer.
    So if your psu draws, let's say 3 A @ 14V, you need a poti that stands at least 42W ! And that's a lot!
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  7. #7
    FLAC shakes's Avatar
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    yes this is true ... it needs to be a high power pot ...

    course if it fries no big deal as the pw70 will just shut off as it has been :-)
    My JeepPC Install

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  8. #8
    FLAC shakes's Avatar
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    a potentiometer put in series with the pw-70 will indeed lower the voltage ... and they will both see the same current.

    items in series have different voltage drops, same current ... items in parallel have same voltage drop, different current.
    My JeepPC Install

    "there are no stupid questions, just stupid people."

    "it's been agreed the whole world stinks so no one's taking showers anymore"

  9. #9
    Raw Wave wizardPC's Avatar
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    so where does one get a diode that is capable of handling something like this. I'm pretty sure that the little ones you can buy at Radio Shack aint gonna cut it.

    (I am about to go outside and test this with my pot)
    Debt as of 1/1/05: $34,354.48
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  10. #10
    FLAC shakes's Avatar
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    digikey ... the mbr6045 ... unless you have a good electronics store in your area
    My JeepPC Install

    "there are no stupid questions, just stupid people."

    "it's been agreed the whole world stinks so no one's taking showers anymore"

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