【知識】USB Power Standards
USB power standards Specification Current Voltage Power USB 1.x and 2.0 500 mA [a] 5 V 2.5 W USB 3.0 900 mA [b] 5 V 4.5 W USB 3.1 2 A 5 V 10 W 5 A 12 V 60 W 5 A 20 V 100 W USB Battery Charging 0.5–1.5 A 5 V 2.5–7.5 W USB Power Delivery 2 A 5 V 10 W 3 A 12 V 36 W 3 A 20 V 60 W 5 A 20 V 100 W Up to five unit loads; in USB 1.x and 2.0, one unit load is 100 mA. Up to six unit loads; in USB 3.0, one unit load is 150 mA. 資料來源:維基百科