[SOLVED] Supplement USB power output from motherboard

[grimfox]

From my motherboard I currently get a measly 300mA of power output on the USB3.0 ports. That's over 1hr to get 25% charge. It seems like there ought to be a way to simply splice in the 5V rail from the PSU to allow the device to take as much power as it needs. Most common smartphone wall wart will do 2A(10w) for instance. I was honestly surprised that I couldn't find a device that would allow for that. Or something smarter that would allow for QC3. I found that device for my car, it came in a neat and tidy package and allows me to charge my phone in about 30 minutes compared to the default port in the console that can barely keep my phone on. I just needed to connect it to 12v.

Is my search fu weak? Is there an internal adapter available that will accomplish my dream of high power USB ports on my PC? Or is this something that just doesn't exist? I can understand there is an added cost to including QC3 but the motherboard USB 3.0 header should be capable of delivering 1A easily (I checked the datasheets for the connector rated for anywhere from 1.5-3A). And a splicing device that draws power from the 5v pin on a molex connector should be easy. For very little additional cost you could add a few caps to filter that power or even regulate from the 12V rail.

 

[CountMike]

From my motherboard I currently get a measly 300mA of power output on the USB3.0 ports. That's over 1hr to get 25% charge. It seems like there ought to be a way to simply splice in the 5V rail from the PSU to allow the device to take as much power as it needs. Most common smartphone wall wart will do 2A(10w) for instance. I was honestly surprised that I couldn't find a device that would allow for that. Or something smarter that would allow for QC3. I found that device for my car, it came in a neat and tidy package and allows me to charge my phone in about 30 minutes compared to the default port in the console that can barely keep my phone on. I just needed to connect it to 12v.

Is my search fu weak? Is there an internal adapter available that will accomplish my dream of high power USB ports on my PC? Or is this something that just doesn't exist? I can understand there is an added cost to including QC3 but the motherboard USB 3.0 header should be capable of delivering 1A easily (I checked the datasheets for the connector rated for anywhere from 1.5-3A). And a splicing device that draws power from the 5v pin on a molex connector should be easy. For very little additional cost you could add a few caps to filter that power or even regulate from the 12V rail.

If you can't get full power from USB3 port you may have a problem with USB cable that's either too long or too thin. If you look at some higher power devices like external HDD you could see that they come with very short and thick cables just for that reason.
Likewise, phone chargers are oversized (amperage wise) just because of long cables to attenuate power loss.
Yes you can splice into 5v from Molex or SATA but that would work only for that one USB connector. You would have to disconnect + and - from that header so power doesn't go back to MB which could burn it.