I am going to test a 7 port hub plus a custom psu

[philipma1957]

 I am deleting old posts

[southerngentuk]

Thats a 5V hub    aannnddd a 12V PSU

You might not want to do that!

Edit: mixed up your links, me bad... I`ll leave it above just in case anyone else gets any crazy ideas


Why dont you just get a standard ATX PSU separate the 5V and 12V lines and solder the 5V directlty to the hubs.

Bonus : you have spare 12V for K16`s and  fans....

[bluebillet]

Howdy. This is some excellent engineering and testing. I was looking at that exact power supply to power two 7-port hubs. My only concern was how well the USB hub would be able to cope with the extra current push from the 26A supply. I've seen a few other threads where someone tried to remove the current limiting diodes from the USB Hub PCB, but I'm not sure if that is a good idea.

It seems the vast majority of the USB problems with these USB based miners is insufficient power going to each respective port from the under rated supplies included with the hubs. The other issue seems to be with USB 3.0 compatibility with USB 2.0 systems. This appears to be the case with those embedded platforms like the Raspberry Pi where it doesn't work with USB 3.0 at all.

Will you be connecting your hubs to a full fledged x86 PC or a some sort of embedded platform like the Raspberry Pi?

Looking forward to your test results...

[xjack]

Howdy. This is some excellent engineering and testing. I was looking at that exact power supply to power two 7-port hubs. My only concern was how well the USB hub would be able to cope with the extra current push from the 26A supply. I've seen a few other threads where someone tried to remove the current limiting diodes from the USB Hub PCB, but I'm not sure if that is a good idea.

It seems the vast majority of the USB problems with these USB based miners is insufficient power going to each respective port from the under rated supplies included with the hubs. The other issue seems to be with USB 3.0 compatibility with USB 2.0 systems. This appears to be the case with those embedded platforms like the Raspberry Pi where it doesn't work with USB 3.0 at all.

Will you be connecting your hubs to a full fledged x86 PC or a some sort of embedded platform like the Raspberry Pi?

Looking forward to your test results...

Not sure what you mean by "current push" of the 26A supply.   

The devices will pull what they need in amps, no more.  If you haven't modified the PCB, then you're still running "stock".  Just with more overhead available on the PSU.

[bluebillet]

xjack:

Thanks for your concern and interest. I realize that the target device will only take in the current it requires and the supply will have plenty of overhead. My concern is on the quality of the power regulation components on the USB hub PCB. If it is a 7 port design, it should require 3.5A to the ports + 0.2A to drive the hub chip + other SMD devices present on the PCB.  If the hub of interest is a decent design, there should be no issue as the current blocking diodes on board the PCB should protect the hub in an over current situation if a device that was plugged in was out of spec.

If the quality of the components on the hub PCB was of lower quality, then there may be a potential of premature failure due to the components being pushed continually to the maximum. Since the power supply is robust, it will have no issue supplying the required current; rather, it is the ability of the hub to be operated reliably at continuous maximum load.

Perhaps I should have stated it as the supply will keep pushing the required current; however, the hub may prematurely fail due to continuous stress.

I am very interested in the results of this experiment and I am looking for reliable USB hubs for continuous operation and I am in the process of designing a similar USB hub "farm" to plug in a large quantity of USB mining devices.

[xjack]

...snip...
 If the hub of interest is a decent design, there should be no issue as the current blocking diodes on board the PCB should protect the hub in an over current situation if a device that was plugged in was out of spec.

...snip...
however, the hub may prematurely fail due to continuous stress.
...snip...

Understood - your original post read as if you were wondering simply about the extra amps being a problem, rather than port overload.