ENERGY EFFICIENT METHOD TO WAKE HOST SYSTEM FOR CHARGING BATTERY POWERED PORTABLE DEVICES VIA BUS POWERED EXTERNAL I/O PORTS

• US 20090271644A1
• Filed: 04/28/2008
• Published: 10/29/2009
• Est. Priority Date: 04/28/2008
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Messick, Douglas Evan, Cross, Kyle E., Fiebrich, Greg R.
• Granted Patent: US 8,037,331 B2
• Time in Patent Office: Days
• US Class Current: 713/320
• 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
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034

Abstract

Optimized bus powered peripheral battery charging includes a circuit to initiate a change in an advanced configuration and power interface (ACPI) state in a controller allowing charging of a peripheral device battery, the circuit including a signal converter coupled between an input port and the controller to sense when a the peripheral device battery is coupled to an input port and to restrict the controller from changing ACPI state multiple times for a given peripheral device battery coupling; and a ground loop detector coupled in parallel to the signal converter between the input port and the controller to allow the controller to know that the peripheral device battery has maintained being coupled to the input port.

Claims

1. A circuit to initiate a change in an advanced configuration and power interface (ACPI) state in a controller allowing charging of a peripheral device battery, the circuit comprising:

a signal converter coupled between an input port and the controller to sense when the peripheral device battery is coupled to the input port and to restrict the controller from changing ACPI state multiple times for a given peripheral device battery coupling; and

a ground loop detector coupled in parallel to the signal converter between the input port and the controller to allow the controller to know that the peripheral device battery has maintained being coupled to the input port.

2. The circuit of claim 1, wherein the signal converter is coupled to a power switch input of the controller.

3. The circuit of claim 2, wherein the signal converter translates a falling edge at the input port into a limited duration pulse at the controller power switch input.

4. The circuit of claim 1, wherein the ground loop detector is coupled to a general purpose input of the controller.

5. The circuit of claim 1, wherein the signal converter further comprises:

a capacitor in series between the input port and the controller.

6. The circuit of claim 1, wherein the input port is a universal serial bus (USB) port.

7. The circuit of claim 1, wherein the change in the ACPI state in a controller is a change from a G3 state to an S5 state.

8. An information handling system (IHS) comprising:

a processor;

a controller coupled to the processor;

an input port coupled to the processor; and

a circuit to initiate a change in an advanced configuration and power interface (ACPI) state in the controller allowing charging of a peripheral device battery, the circuit further comprising;

a signal converter coupled between the input port and the controller to sense when the peripheral device battery is coupled to the input port and to restrict the controller from changing ACPI state multiple times for a given peripheral device battery coupling; and

a ground loop detector coupled in parallel to the signal converter between the input port and the controller to allow the controller to know that the peripheral device battery has maintained being coupled to the input port.

9. The IHS of claim 8, wherein the signal converter is coupled to a power switch input of the controller.

10. The IHS of claim 9, wherein the signal converter translates a falling edge at the input port into a limited duration pulse at the controller power switch input.

11. The IHS of claim 8, wherein the ground loop detector is coupled to a general purpose input of the controller.

12. The IHS of claim 8, wherein the signal converter further comprises:

a capacitor in series between the input port and the controller.

13. The IHS of claim 8, wherein the input port is a universal serial bus (USB) port.

14. The IHS of claim 8, wherein the change in the ACPI state in a controller is a change from a G3 state to an S5 state.

15. A method to initiate a change in an advanced configuration and power interface (ACPI) state in a controller allowing charging of a peripheral device battery, the method comprising:

coupling a signal converter between an input port and the controller to sense when the peripheral device battery is coupled to an input port and to restrict the controller from changing ACPI state multiple times for a given peripheral device battery coupling; and

coupling a ground loop detector in parallel to the signal converter between the input port and the controller to allow the controller to know that the peripheral device battery has maintained being coupled to the input port.

16. The method of claim 15, wherein the signal converter is coupled to a power switch input of the controller.

17. The method of claim 16, wherein the signal converter translates a falling edge at the input port into a limited duration pulse at the controller power switch input.

18. The method of claim 15, wherein the ground loop detector is coupled to a general purpose input of the controller.

19. The method of claim 15, wherein the signal converter further comprises:

a capacitor in series between the input port and the controller.

20. The method of claim 15, wherein the change in the ACPI state in a controller is a change from a G3 state to an S5 state.