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Thread: Power Problems

  1. #1
    Newbie
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    Power Problems

    I have a m1000 board with USB GPS, 160g WD hard drive, Plextor dvd/CD-RW, and a 7" lilliput touchscreen.
    I'm using a pw-200m power supply and a ITPS to regulate the voltage.

    The problem is I dont think the sequencer is sending enough power to the power supply. I'm Under 100Watts on all my items as far as I can tell.

    I tested the voltage going in the sequencer. It is 12.5 going in and about 10.5 going out when the vehicle is just switched on and then 13.5-14 going in and about 11.5 when the vehicle is running.

    Does anyone know why this is? and what can I do to fix it?

    I tried bypassing the sequencer but the power supply will only start up momentarily and then shut off after about 10 seconds. So I need a regulated 12 volts.

  2. #2
    Maximum Bitrate Maņana's Avatar
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    The thing is that the itps is a linear power supply (think its called that in english?). That means that when it gets a voltage higher than the output it just "burns the power away" (Because of this it gets very hot). This is why a linear powersupply never can output a voltage higher than the input. The powerloss you are talking about is just because of the components in the itps. A liner powersupply simply works like that! I'm having difficulty explaining this in english, but it is because of the resistanse in the components. This normalt leads to a loss of at least 1 volt.

    Your loss is quite higher, but i think this is what is causeing it...

    This is why you shold use "switching powersupplys" (really don't know the english name of those things). They are more advanced and they "rebuild" the power with high frequent stuff :P Thats why they can output a higher voltage than the input. It is also far more efficient and doesnt get as hot as a linear powersupply.

  3. #3
    Maximum Bitrate Maņana's Avatar
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    Damn I felt like a nerd writing all that **** down...

  4. #4
    FLAC
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    jaymx211,

    What Manana says is true. You should ditch the ITPS. It will never provide reliable power to your CarPC when your engine is not running. Search these forums for ITPS problems. You'll find plenty.

    The ITPS uses a linear regulator and requires +13.4V in to get +12V out. Your PW-200M chokes when it gets much lower than +11.5V in.

    I (humbly) suggest that you look at the Carnetix DC-DC regulator. It does what the ITPS is SUPPOSED to do, and provides a few more features.
    MikeH

  5. #5
    Maximum Bitrate Maņana's Avatar
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    Or you can buy an opus... Like i did, AFTER i had bought a pw-70. Tough, you should be aware of the temerature problem with the 90watt opus... Opus wont power up, wtf?! Help please!

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