Now prior to this update, the maximum amount of power you could delivery over USB-C port was 100W. This was possible through USB-C chargers and cables rated 20V at 5A. Now the USB promoter group says that the USB Type-C specification has been updated with release 2.1 to define 240W cable requirements which will extend the applicability of USB PD to a large number of applications where 100W wasn’t enough. The USB promoter group hopes that the new USB PD specification will enable high power laptops/notebooks to be powered via USB-C instead of their traditional connectors. The most important aspects of the USB PD 3.1 specification include;
A choice of three new fixed voltages: 28V (above 100W), 36V (above 140W) and 48V (above 180W) joining previously defined 5V, 9V, 15V and 20V fixed voltages.A new adjustable voltage mode enabling a range from 15V to one of three maximum voltages (28V, 36V, or 48V) depending on the available power allowing the device being powered to request specific voltages to a 100 mV resolution.
The USB Prmoter Group is comprised of Tech bigshots such as Apple Inc., Hewlett-Packard Inc., Intel Corporation, Microsoft, Renesas Electronics Corporation, STMicroelectronics, and Texas Instruments.
