Patent ID: 9086868
Filing Date: 2015-07-21
Classification: G06F

Abstract:
1. A hub device for communicating with a USB host controller and a USB device to transmit and receive data through USB, comprising: a USB hub IC including a plurality of downstream ports; a voltage converter that converts a source voltage supplied to the hub device into a source voltage to be supplied to a plurality of USB devices connected to the plurality of downstream ports; and a plurality of switch units that interrupt the source voltage supplied by the voltage converter to the plurality of USB devices, and output an overcurrent detection signal when overcurrent flows into the plurality of USB devices, wherein the USB hub IC comprises a plurality of overcurrent detection terminals into which the overcurrent detection signal from the plurality of switch units is input, and a signal notifying an abnormal condition of the voltage converter that causes the plurality of overcurrent detection terminals of the USB hub IC to be in an overcurrent detection condition, and wherein in a condition where the source voltage from the voltage converter to the plurality of USB devices is continued, in an overcurrent state in which overcurrent flows into at least one of the plurality of USB devices, a switch unit corresponding to the one of the plurality of USB devices in the plurality of switch units interrupts the source voltage supplied by the voltage converter to the one of the plurality of USB devices, and the USB hub IC receives an overcurrent detection signal corresponding to the one of the plurality of USB devices, and in an abnormal state in which the source voltage supplied by the voltage converter to the plurality of USB devices is interrupted, the USB hub IC receives plural overcurrent detection signals corresponding to the plurality of USB devices.