Invention Grant
- Patent Title: Systems and methods for charging a chargeable USB device
- Patent Title (中): 对可充电USB设备充电的系统和方法
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Application No.: US11057976Application Date: 2005-02-15
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Publication No.: US07679317B2Publication Date: 2010-03-16
- Inventor: Dusan Veselic
- Applicant: Dusan Veselic
- Applicant Address: CA Waterloo, Ontario
- Assignee: Research In Motion Limited
- Current Assignee: Research In Motion Limited
- Current Assignee Address: CA Waterloo, Ontario
- Agency: Conley Rose, P.C.
- Agent J. Robert Brown, Jr.
- Main IPC: H02J7/00
- IPC: H02J7/00 ; H02J7/04

Abstract:
Systems and methods are provided for charging a USB device. A USB connector may be used to couple the system to a USB port on the USB device, the USB connector including a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−) connector. Charger circuitry may be used to receive a source voltage and convert the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device. Presence detect circuitry may be used to compare a first voltage present on the D+ connector with a second voltage present on the D− connector in order to detect when the USB connector is coupled to the USB port of the USB device.
Public/Granted literature
- US20060181241A1 Systems and methods for charging a chargeable USB device Public/Granted day:2006-08-17
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