Michaelo napísal:Som si isty, ak neveris, pozri si:

az po 3:40 cca.
A USB ti podporuje az do 20V

Sak si zober, ze niektore podsvietene klavesnice potrebuju 2x USB 2.0 aby vobec sli no uplne im staci jediny USB 3.0 port

Devices can request higher currents and supply voltages from compliant hosts – up to 2 A at 5 V (for a power consumption of up to 10 W), and optionally up to 3 A or 5 A at either 12 V (36 W or 60 W) or 20 V (60 W or 100 W)

In July 2012, the USB Promoters Group announced the finalization of the USB Power Delivery ("PD") specification, an extension that specifies using certified "PD aware" USB cables with standard USB type A and B connectors to deliver increased power to devices with larger energy demand. Devices can request higher currents and supply voltages from compliant hosts – up to 2 A at 5 V (for a power consumption of up to 10 W), and optionally up to 3 A or 5 A at either 12 V (36 W or 60 W) or 20 V (60 W or 100 W). In all cases, both host-to-device and device-to-host configurations are supported.

PD-aware devices implement a flexible power management scheme by interfacing with the power source through a bidirectional data channel and requesting a certain level of electrical power, variable up to 5 A and 20 V depending on supported profile.



The USB 3.0 SuperSpeed specifications boost will up the power delivery to 100 watts, from just 10 watts, through delivering a maximum of 20 volts at 5 amps.