Patent ID: 7945711

Claim:
An apparatus for controlling power to a Universal Serial Bus (USB) device configured to connect a Personal Computer (PC) with a peripheral device, the apparatus comprises: a plug-in port configured to connect the peripheral device with the PC; a state detector configured to transmit a state detection request signal to a Central Processing Unit (CPU) of the peripheral device when the peripheral device is plugged in the plug-in port, and to determine that the peripheral device is in a preparation completion state when a response signal is received from the CPU of the peripheral device in response to the state detection request signal; a power supply unit configured to supply power to the USB device; and a power control unit configured to control the power supply unit to supply power to the USB device when the state detector determines that the peripheral device is in the preparation completion state after the peripheral device is plugged in the plug-in port and to control the power supply unit to interrupt power to the USB device before the peripheral device is plugged in the plug-in port and before the state detector determines that the peripheral device is in the preparation completion state after the peripheral device is plugged in the plug-in port, wherein the apparatus is included in the USB device.