Overcurrent protection circuit and method for universal serial b

Details Overcurrent protection circuit and method for universal serial b Overcurrent protection circuit and method for universal serial b

1998-04-27

2000-05-16

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 931, 39575001, 39520038, H02H 300

Patent

active

060645547

ABSTRACT:
An overcurrent protection circuit for a universal serial bus (USB) hub unit is comprised of a USB hub controller for controlling the operation of the USB hub unit, a plurality of power switches for switching operating voltages under the control of the USB hub controller respectively, a plurality of power output ports for transferring output voltages from the power switches to the subsequent USB hub units or peripheral devices respectively connected thereto, a plurality of overcurrent detectors respectively connected between the power switches and the power output ports for generating overcurrent detection signals when overcurrent flows to the subsequent USB hub units or peripheral devices, and a plurality of signal transfer/power interruption controllers each for transferring the overcurrent detection signal from a corresponding one of the overcurrent detectors to an input terminal of the USB hub controller and controlling a corresponding one of the power switches in response to a power interruption signal from an output terminal of the USB hub controller to interrupt the supply of power to a corresponding one of the power output ports. According to the invention, only one input terminal and one output terminal of the USB hub controller are used to prevent overcurrent from flowing to the subsequent USB hub units and/or peripheral devices.

REFERENCES:
patent: 5675813 (1997-10-01), Holmdahl

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