拋棄傳統電源：用USB線給電腦供電

所謂的 新的USB功率傳輸標準（Power Delivery spec），
USB 3.0 PD 將USB數據線的功率傳輸上限提高到了100瓦如下:

Profile 1 is 2A@5V or 10W, roughly what Gigabyte delivers now on their 3X power boards. From there,
Profile 2 is 5V@2A or [email protected],
Profile 3 is 5V@2A or 12V@3A,
Profile 4 adds 20V@3A to it’s predecessor, and
Profile 5 bumps the 12V and 20V to the full 5A.
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