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Thread: usb power when system is off

  1. #1
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    Question usb power when system is off

    I tried searching for this but wasn't sure what to search for, "usb power" gets an ASSLOAD of results so here goes:

    I noticed all my usb devices are still powered on even when my machine is off. This is a problem as my battery kinda sux0rs , so is there any way to control this? I'd like nearly no power to be drained when my machine is off. Do i just need to install a switch in line w/ my 12v power for my opus? Thanks in advance fellas!
    -Ross
    02 Camaro SS
    Opus 150W($150 used) Morex Venus 668 Case($109) Epia M10k($166) 128 Megs ($0), Maxtor 200Gig($76) CD-R/DVD($29) Lilliput 7"($285) Buffalo Airstation($42) Holux GPS($53) GM10-AUX(audio input, $72)
    Tot: $983
    Buying stereo!

  2. #2
    FLA gospeed.racer's Avatar
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    I personally wired up a relay for my USB that uses the 12v power from the power supply (yellow/black wires on the 4 pin connectors) to the coil side and it makes/breaks the 5v positive usb wire. Very simple job and works great.
    2005 Ford Focus ST

  3. #3
    FLA gospeed.racer's Avatar
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    Here is a quick drawing
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    2005 Ford Focus ST

  4. #4
    FLAC john1701's Avatar
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    i also have a different mod in my opus mods section. Check out mod #1

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  5. #5
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    wouldn't it be alot easier just to wire a switch into the 12v power line? shut off the power to the system entirely?
    -Ross
    02 Camaro SS
    Opus 150W($150 used) Morex Venus 668 Case($109) Epia M10k($166) 128 Megs ($0), Maxtor 200Gig($76) CD-R/DVD($29) Lilliput 7"($285) Buffalo Airstation($42) Holux GPS($53) GM10-AUX(audio input, $72)
    Tot: $983
    Buying stereo!

  6. #6
    Constant Bitrate JPuma's Avatar
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    yeah, use a power controller that will kill power to the inverter or PSU when your system shuts down or is off. Though I like the brave idea of putting the 5V on the usb connection on a relay.

  7. #7
    FLA gospeed.racer's Avatar
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    If you want to get technical, it would be easier yet to just buy a laptop

    I did the mod to the 5v line and it worked wonderfully, and that was with a cheapie PW-70 or 80...the Opus mod that was in the other post looks interesting...but specific to Opus. I have had people ask if the USB cares that it wont recieve power until the 12V is up...it makes no difference EXCEPT if you use a standby or hibernate...then it gets grumpy
    2005 Ford Focus ST

  8. #8
    Maximum Bitrate Mad Ad's Avatar
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    Quote Originally Posted by gospeed.racer
    I have had people ask if the USB cares that it wont recieve power until the 12V is up...it makes no difference EXCEPT if you use a standby or hibernate...then it gets grumpy
    oh hell- this is one bridge ive yet to cross... ok so why not use 2 relays? Im sure there must be some way of stacking 2 so when the IGN is on, usb gets power cuz the opus takes 10 secs or so to boot- by the time thats starting, +5 would already be on and un-hibernating wouldnt cause a fit? However when IGN is off but the PC is still on, we dont want to cut the +5.

    So we need a relay stack that will act like this
    PC off and IGN off = cut 5v
    PC off and IGN on = +5 on
    PC on and IGN off = +5 on
    PC on and IGN on = +5 on

    Is that about right? Anytime the IGN is on we can assume the car is running (or at least theres someone about) but when the IGN is off but the PC is on it could be a fuel stop or parked up at home transferring files.

  9. #9
    Constant Bitrate JPuma's Avatar
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    I need to solve a problem and was thinking of this thread and wanted to run it past you guys. All my USB devices are hub powered and hub is self powered except for my dlink 108bmbps wireless and my audigy 2 nx, the sound card is self powered. I want to cut the 5V supply to the two USB ports that are connected to the hubs completely. The reason why is at times my computer will start up and the wireless network usb will not start. This is my second USB thinking it was the dlink and it still does that same thing. No power, nothing. I have to power down or resart to get it working. No other USB hardware does this, but ocasionally my BU-303 stops responding, not sure why though but that guy could be hogging the hub power since it shows it takes 500ma and I have other devices on the hub its connected to.....but thats another story. What I want to do is stop the computer from using 5V on those two ports, even though it may not, I would feel better knowing the 5V was not going to the hubs at all. Will this be a problem?

    I also plan to do this with a firewire selfpowered hub I have. Maybe theres too much drain on the pc's power and it cannot provide enough power to startup the dlink.

  10. #10
    Newbie craigt's Avatar
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    I put a switch before the Opus 150W as I don't like the idea of leaving PSU you while car unattended. Am I just being paranoid?

    I also noticed that with the switch on and the PC shut down, not only does my USB hub remain powered, but also dvd writer and my HDD led is on... is this correct?

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