External device charging while notebook is off

• US 8,583,946 B2
• Filed: 02/22/2008
• Issued: 11/12/2013
• Est. Priority Date: 02/22/2008
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Tracy, Mark S., Doczy, Paul J., Lev, Jeffrey A.
• Primary Examiner(s): BUTLER, DENNIS
• Application Number:
  US12/866,613
• Publication Number:
  US 20110047393A1
• Time in Patent Office: 2,090 Days
• Field of Search: None
• US Class Current: 713/300
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips

Abstract

A computer comprises a power supply that provides operating power for the computer and a connector on the computer through which an external device can be coupled to the computer. The power supply powers an auxiliary power rail even when the computer is otherwise off. The auxiliary power rail is provided to the connector to thereby provide power to the external device even when the computer is off.

Claims

1. A computer, comprising:

a power supply that provides operating power for the computer as well as an auxiliary power rail;

a connector on the computer through which an external device can be coupled to said computer; and

a switch to selectively couple the auxiliary power rail to the connector;

wherein said power supply powers the auxiliary power rail even when the computer is otherwise off; and

wherein, with the computer in an off state, the computer is to detect when an external device is connected to the connector and, in response, the switch is provide said auxiliary power rail to said connector to thereby provide power to the external device even when said computer is in the off state.

2. The computer of claim 1 wherein said connector is a universal serial bus (USB) connector.

3. The computer of claim 1 further comprising a visual indicator that visually indicates when said connector receives voltage from said auxiliary power rail.

4. The computer of claim 1 further comprising a visual indicator that visually indicates when said connector receives voltage from said auxiliary power rail when said computer is off.

5. The computer of claim 1 wherein said computer, via said connector, charges a battery in the external device even when the computer is off.

6. A computer, comprising:

means for electrically coupling to an external device; and

means for detecting that the external device has been connected to the computer when said computer is in an off state and charging a battery in the external device when said computer is in the off state.

7. The computer of claim 6 wherein said means for charging the battery comprises an auxiliary power rail from a power supply, said auxiliary power rail being active even when said computer is off.

8. The computer of claim 6 further comprising means for visually indicating to a user that the battery is being charged when said computer is off.

9. A computer, comprising:

a power supply that provides operating power for the computer as well as an auxiliary power rail, said auxiliary power rail remaining active even when said computer is otherwise in an off state;

a connector on the computer through which an external device can be coupled to said computer; and

a solid-state switch that detects the external device when the computer is in the off state and selectively couples the auxiliary power rail to the external device via the connector when the computer is in the off state and the external device is coupled to the connector.

10. The computer of claim 9 further comprising a visual indicator coupled to said solid-state switch, said visual indicator indicates when the auxiliary power rail is provided to the connector.