Power supply of display apparatus with universal serial bus device

Abstract

a power supply of the display apparatus includes a switching mode power supply forming the main power supply of the display apparatus. The power supply of this invention includes an auxiliary power supply for supplying power with a universal serial bus (USB) hub. The power supply further includes a display power management signaling (DPMS) control circuit for managing the power saving between the full-on, standby, suspend, and power-off modes, a relay switch is provided across the power line directed to the main power supply. The DPMS control circuit responds to input status of the horizontal and vertical synchronization signals (Hsync, Vsync) and, in the power-off mode, it produces a control signal that cuts off the relay switch. The power supply of this invention provides a stable supply power with the USB hub even if the display apparatus enters the power-off mode of DPMS. Further, the power supply of this invention can cut off power supply directed to the main power supply when the display apparatus enters the power-off mode.

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