USB power supply method and device, and end device and system using the same

Patent metadata

Field	Value
Publication number	US-8949631-B2
Application number	US-201213364364-A
Country	US
Kind code	B2
Filing date	Feb 2, 2012
Priority date	Sep 23, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A Universal Serial Bus (USB) power supply method is provided. The method is applied to a USB client device to charge a battery of the USB client device. The USB client device is connected to a USB host device via a USB connection including a D+ signal wire and a D− signal wire. The USB power method includes: determining whether the USB host device is a dedicated charging port (DCP) in response to a connection event, providing a verification signal to the USB host device if the USB host device is a DCP, determining whether a verification response signal from the USB host device is received, and driving the USB host device to provide an auxiliary charging current via the D+ and D− signal lines for charging the battery when the verification response signal is received.

First claim

What is claimed is:

1. A USB power supply method, applied to a USB client end device to charge a battery of the USB client end device, the USB client end device being connected to a USB host device via a USB communication connection, the USB communication connection comprising a D+signal wire and a D−signal wire, the method comprising:
a) in response to a connection event, determining whether the USB host device is a dedicated charging port (DCP);
b) providing a verification signal to the USB host device when the USB client device is connected to the DCP;
c) determining whether a verification response signal from the USB host device is received;
d) upon receiving the verification response signal, driving the USB host device to provide an auxiliary charging current via the D+and D−signal wires; and
e) charging the battery according to the auxiliary charging current provided by the D+and D−signal wires.

2. The USB power supply method according to claim 1 , between Steps (c) and (d), further comprising:
f) reading status information of the battery to determine whether the battery is in a sufficient power status; and
g) performing Step (d) when the battery is not in the sufficient power status.

Assignees

• Chen Hung-Yi
• Quanta Comp Inc

Inventors

• Chen Hung-Yi

Classifications

• G06F1/266 Primary

  Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips · CPC title