Patent ID: 6049880
Filing Date: 2000-04-11
Classification: G09G

Abstract:
A display monitor apparatus that controls power in a plurality of peripheral devices coupled to a computer, comprising:a universal serial bus hub, having one upstream universal serial bus port connected to said computer and a plurality of downstream universal serial bus ports respectively connected to said plurality of peripheral devices;a hub power supply supplying a power to said plurality of peripheral devices through said plurality of downstream universal serial bus ports;a hub power detection circuit detecting an excessive voltage on any one of said plurality of downstream universal serial bus ports and generates a detection signal for cutting off said power supplied to said plurality of peripheral devices;a video display conveying varying visual information to a user;a primary power supply receiving alternating current power from a source, and supplies a direct current voltage to said hub power supply;a monitor controller controlling said video display, said primary power supply and said hub power supply, and receives said detection signal generated by said hub power detection circuit;an on-screen display controller driving said video display to display images corresponding to status of said hub power supply, in accordance with said control of said monitor controller, to inform said user of said status;said hub power supply comprising:a switching regulator, controlling said supply of said direct current voltage from said primary power supply to said hub power supply, having a first terminal connected to said primary power supply, a second terminal connected to said monitor controller, and a third terminal; anda filter circuit including a predetermined number of capacitors, disposed between said third terminal of said switching regulator and said plurality of downstream universal serial bus ports;said filter circuit comprising:a first capacitor, having a first terminal connected to said third terminal of said switching regulator and a second terminal connected to a reference potential.