I'm thinking about adding more power to my laptops USB 2.0 ports, by hooking it up to a buck converter witch takes its input directly from the power connector of my laptop.
The voltage and current supplied by the charger are 19V ~4A and this is the voltage i would supply the buck converter to and then get 5V out of it and as much current as possible (i don't think the current is going to be an issue though since i wont need more than 2A anyway) and then connect these 5V to the USB power lines, i hope you get the picture!
I don't want to use a powered USB hub because its not practical and i need another power supply for no real reason as it seems.
Did anyone do something similar and do i need to pay attention to something while doing this (i don't want to mess up the ports since they are kind of custom and harder to find, and that applies to the on board hub also), thanks.
Best Answer
Don't do this. You'll likely damage the internal 5 V supply in the USB port by 'back-feeding' it from the additional supply.
If the additional supply powers up after the motherboard one, then before it powers up, it'll act as a load on the motherboard, and possibly the USB port will be disabled by its own internal protection. Conversely, if it remains powered after the motherboard is shut down, likely the motherboard won't be happy.