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    Mixing usb in parellel and series

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by hhhd1, Jul 17, 2014.

  1. hhhd1

    hhhd1 Notebook Consultant

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    is there any problem with mixing usb in parellel and series ?

    lets say i have 3 usb ports, i want to connect them like in picture,

    i did a rough calculation, and that should give me a total of 10v, and 7.5w

    how much ampere am i going to get ? (7.5w / 10v = 0.75 amp , is this right ?)

    is this safe on the usb ports and the motherboard ?

    my goal is to power a router that uses 9VDC/0.6A

    [​IMG]

    EDIT:
    I think this will NOT work.

    I used and ohm meter, and found out that some of the power pins between different usb ports are connected internally with zero ohm resistance between them. .. so they do not act as separate power sources.

    If anyone still have any idea, I would appreciate it.
     
    hhhd1, Jul 17, 2014
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  2. Dufus

    Dufus .

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    Well your series USB would still be limited to 0.5A? for the circuit but it's a mute point since the USB grounds are common you would effectively be shorting it out.
     
    Dufus, Jul 18, 2014
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  3. hhhd1

    hhhd1 Notebook Consultant

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    @Dufus
    yes, you are correct, i did add a post earlier, but it got auto added as an edit to my previous post and it got a bit unnoticed.


     
    hhhd1, Jul 18, 2014
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  4. hhhd1

    hhhd1 Notebook Consultant

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    @Dufus
    yes, you are correct, i did add a post earlier, but it got auto added as an edit to my previous post and it got a bit unnoticed.


     
    hhhd1, Jul 18, 2014
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