Method and apparatus of providing power management using a self-powered universal serial bus (USB) device
First Claim
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1. A computer system coupled to a peripheral bus incorporating a power source therein, the computer system comprising:
- a central processing unit;
a power supply unit coupled to a power source and coupled to the central processing unit wherein the central processing unit draws power from the power supply unit during normal operation of the computer; and
a power manager coupled to the incorporated power source and to the power supply unit to shut down the power supply unit, and to monitor the computer system using power supplied by the incorporated power source when the computer system is in a suspend mode.
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Abstract
The capability of a peripheral bus to provide an alternative low power source is combined with existing power management software that controls a computer'"'"'s main power supply unit to provide stand-by power to logic in the computer that remains active to monitor the system environment for predetermined wake-up events. A self-powered Universal Serial Bus device supplies the minimal power needed by the active logic without the inefficiencies of a dual-stage power supply unit or the expense of incorporating both low-power and a full-power units.
261 Citations
17 Claims
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1. A computer system coupled to a peripheral bus incorporating a power source therein, the computer system comprising:
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a central processing unit; a power supply unit coupled to a power source and coupled to the central processing unit wherein the central processing unit draws power from the power supply unit during normal operation of the computer; and a power manager coupled to the incorporated power source and to the power supply unit to shut down the power supply unit, and to monitor the computer system using power supplied by the incorporated power source when the computer system is in a suspend mode. - View Dependent Claims (2, 3, 4, 5)
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6. A computer system with suspend and resume modes comprising:
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a host computer having logic coupled to a main power supply unit, wherein the main power supply unit is further coupled to a first power source wherein the main power supply unit supplies power to the host computer logic during normal operations; and a Universal Serial Bus remote device coupled to the host computer logic and having a remote power supply unit coupled to a second power source, wherein the remote power supply unit supplies power to the host computer logic when the host computer is in suspend mode. - View Dependent Claims (7, 8, 9, 10)
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11. A computer system with suspend and resume modes comprising:
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a host computer having a central processing unit coupled to a data/address bus and further coupled to a power supply unit, wherein the power supply unit is further coupled to a first power source to supply power to the host computer; a Universal Serial Bus communicatively coupled to the data/address bus and further coupled to a second power source to supply power to the Universal Serial Bus; first and second functions communicately coupled to the Universal Serial Bus, wherein the first and second functions draw power from the second power source; and the second function further coupled to the power supply unit whereby a signal sent from the first function on the Universal Serial Bus causes the second function to direct the power supply unit to provide power from the first power source to the host computer. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of controlling the source of power used for a computer system having a suspend mode and a normal mode comprising the steps of:
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receiving AC power from a main power source; converting the AC power to DC power by means of a power supply unit wherein the computer system draws the DC power from the power supply in normal mode; receiving DC power from a power supply incorporated into a peripheral bus via the peripheral bus; shutting down the power supply unit when the computer enters suspend mode; and monitoring computer system activity using circuitry receiving the DC power from the peripheral bus.
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Specification