Here is the StarTech USB hub I'm referring to:
https://www.amazon.com/dp/B000T9S4CI/You can use this with or without the external power supply.
Even without the external power supply, it seems to clean up the dirty power coming in from a laptop I have.
With the external power supply, it uses that instead the power coming in from the laptop.
One could get even fancier and use a medical power supply instead of the power supply that comes with it, but I found the one that came with it to be fine.
Marc