08850241 is referenced by 42 patents and cites 737 patents.

Multi-stage power adapter techniques are described in which a power adapter for a device is configured to selectively switch between a relatively low power supply and a relatively high power supply. The low power supply may be employed upon initial connection of the adapter to a host device to ensure that the adapter is safe when disconnected and does not supply full power before the device is ready to receive the high power supply. The low power supply may supply enough power for the host device to detect the connection of the adapter and establish initial communication with the adapter. A switch to the high power supply by the adapter may then occur in response to a notification from the host device that indicates the host device is ready for the high power supply. The switch to high power supply enables normal operation of the host device.

Title
Multi-stage power adapter configured to provide low power upon initial connection of the power adapter to the host device and high power thereafter upon notification from the host device to the power adapter
Application Number
13/651287
Publication Number
8850241 (B2)
Application Date
October 12, 2012
Publication Date
September 30, 2014
Inventor
Hiroo Umeno
Seattle
WA, US
Van Winston Oler
Redmond
WA, US
Agent
Micky Minhas
Glen Johnson
Jeremy Snodgrass
Assignee
Microsoft Corporation
WA, US
IPC
G06F 1/32
G06F 1/00
View Original Source