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US 5,938,770 AGranted
Display apparatus for computer system
AssigneeSamsung Electronics Co., Ltd.
InventorYong-Hee Kim
Life of this patent
Estimating the term…
Abstract
A computer monitor in which USB devices connected thereto can be operated with a host power supply voltage provided through host-connected hub ports, even though a power supply voltage from a power supply of the monitor has been cut off. The monitor detects when a power supply voltage to USB devices connected thereto is beyond a rated voltage, and shuts off an abnormal voltage of more than the rated voltage to the USB devices so as to prevent them from being damaged due to the abnormal voltage.
Claims20
A computer monitor for a computer system having a root hub, comprising:
- a power supply for supplying a power supply voltage;
- a universal serial bus (USB) hub controller having an upstream port connected to the root hub and at least one downstream port for selectively providing the power supply voltage in response to a power switching signal applied through the upstream port;
- a monitor power switch for switching between supply and cut-off of an externally supplied power supply voltage to and from the power supply and for generating a switching state signal;
- a power supply level detector for detecting the power supply voltage from the power supply supplied to the computer monitor to generate a power state signal indicative of level of the power supply voltage;
- a logic circuit for receiving the switching state signal and the power state signal and for generating a switching control signal when at least one of them is supplied;
- a power switching section for selecting either the power supply voltage from the power supply or a host power supply voltage through the upstream port in response to the switching control signal;
- and
- a means for detecting an overcurrent state of the power supply voltage provided through the downstream port to generate an overcurrent detection signal and for shutting off the supply of power of the overcurrent state to a universal serial bus device connected to the downstream port in response to the overcurrent detection signal.
5 more elements
Dependencies are inferred from the claim text.