Methods and apparatus for intelligently providing power to a device

• US 8,661,268 B2
• Filed: 07/20/2010
• Issued: 02/25/2014
• Est. Priority Date: 02/22/2010
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Brooks, Benjamin, Smith, Eric
• Primary Examiner(s): Dang, Khanh
• Application Number:
  US12/840,194
• Publication Number:
  US 20110208980A1
• Time in Patent Office: 1,316 Days
• Field of Search: 713/300, 713/310, 713/324, 713/340, 710/300, 710/105, 710/106, 710/110, 710/305, 710/313
• 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

Methods and apparatus for intelligently powering an electronic device are provided. In one embodiment of the invention, a systems management controller controls a power interface to intelligently negotiate power distribution with a peer, client, or a host device. The primary data path is unaffected by the system management controller communications. Various aspects of the present invention are demonstrated with respect to an exemplary implementation of a unified interface, consisting of an optical link (data path) and a USB link (power). As described, one exemplary embodiment of the invention provides a device with power at levels which are much increased over prior art USB solutions.

Claims

1. A computerized apparatus, comprising:

a dual interface, comprising;

a first interface configured for data transfer; and

a second interface configurable for delivering power at a plurality of power output levels from an output power rail, and configurable for receiving power from an input power rail;

a processor coupled to the dual interface;

a demodulator coupled to the input power rail to demodulate an input power control command from the input power;

a modulator coupled to the output power rail to modulate an output power control command into the output power; and

a storage apparatus in data communication with the processor, the storage apparatus comprising computer-readable instructions which, when executed by the processor and responsive to coupling an external device to the dual interface;

determine a power level for the external device; and

enable power output at the power level via the dual interface based on a classification for the external device and the computerized apparatus as one of the group consisting of a chargeable device, a charging device, and a both chargeable and charging device, wherein the chargeable device is configured to drain power from the charging device.

2. The apparatus of claim 1, wherein the second interface is further adapted for data transfer.

3. The apparatus of claim 1, wherein the first interface comprises a USB-compliant interface.

4. The apparatus of claim 3, wherein the dual interface further comprises an optical interface.

5. The apparatus of claim 1, wherein the first interface comprises an optical interface.

6. The apparatus of claim 2, wherein the second interface comprises USB-compliant interface having a USB-compliant power output level.

7. The apparatus of claim 6, wherein at least one of the plurality of power output levels comprises a level that is higher than the USB-compliant power output level.

8. The apparatus of claim 1, wherein the computerized apparatus comprises a portable computer.

9. The apparatus of claim 8, wherein the external device comprises a computer peripheral apparatus.

10. The apparatus of claim 9, wherein at least one of the plurality of power output modes comprises a mode adapted for charging the external device.

11. A method of providing power in a computerized apparatus configured for data transfer over an interface, the method comprising:

establishing at least one link between a first device and a second device, the at least one link configurable for power and data transfer via the interface;

responsive to establishment of the at least one link, determining;

a power delivery capability of the first device; and

a required power level for the second device;

negotiating a power control scheme between the first device and the second device via the interface;

based at least in part on the act of negotiating, providing power to the second device via the interface, wherein negotiating a power control scheme comprises classifying the first device and the second device as one from the group consisting of a charging device, a chargeable device, and a both charging and chargeable device, and further wherein

providing power to the second device comprises draining power from the charging device to the chargeable device;

modulating in an output power rail in the first device a power control command into the output power provided by the first device; and

demodulating in an input power rail in the second device the power control command from the input power received by the second device.

12. The method of claim 11, wherein the act of determining a power level required by the second device comprises receiving a message from the second device;

and wherein the step of negotiating a power control scheme is configured to comply with both the power delivery capability of the first device and the power level required by the second device.

13. The method of claim 11, wherein the interface comprises a USB-compliant interface configured for power transfer at a plurality of power levels, at least one of the plurality of power levels comprising a USB-compliant power level.

14. The method of claim 13, wherein the providing power to the second device comprises configuring the USB-compliant interface for providing power at a level that is in excess of the USB-compliant power level.

15. The method of claim 12, wherein the message comprises a request to provide power at an enhanced level.

16. The method of claim 13, wherein the computerized apparatus further comprises a second interface, and the method further comprises configuring the second interface for transfer of data in lieu of the first interface.

17. The method of claim 11, wherein the first interface comprises a USB interface, and the act of providing power to the second device comprises providing power at a USB-compliant power level.

18. The method of claim 11, wherein the negotiating a power control scheme is performed substantially independent from the data transfer.

19. A multipurpose interface for use with computerized devices, comprising:

a first interface configured for data transfer;

a second interface configured for power transfer, the second interface comprising an input power rail configured to receive a plurality of input power levels and an output power rail configured to provide an output power;

a demodulator coupled to the input power rail to demodulate an input power control command from the input power;

a modulator coupled to the output power rail to modulate an output power control command into the output power; and

a logic apparatus coupled to the first interface and the second interface, and comprising a medium adapted to store computer-readable instructions, the instructions which, when executed;

determine if a device is coupled to at least one of the first interface and the second interface;

if the device is coupled, determine a required power for the device;

negotiate with the device a power delivery scheme based at least in part on the act of determining the required power; and

provide the required power to the device via the second interface in accordance with the scheme, wherein

to negotiate a power deliver scheme comprises to classify the device as one from the group consisting of a charging device, a chargeable device, and a both charging and chargeable device, and further wherein

to provide the required power comprises to drain power from the charging device to the chargeable device.

20. The multipurpose interface of claim 19, wherein the act of determining a required power comprises receiving a message from the device.

21. The multipurpose interface of claim 19, wherein the act of determining a required power comprises (i) prompting the device, and (ii) substantially in response to the prompting, receiving at least one message from the device.

22. The multipurpose interface of claim 19, wherein the first interface comprises a USB-compliant interface.

23. The multipurpose interface of claim 22, further comprising an optical interface.

24. The multipurpose interface of claim 19, wherein the second interface comprises a USB-compliant interface configured for both power transfer and data transfer.

25. The multipurpose interface of claim 24, wherein the USB-compliant interface is configured to support a plurality of power transfer modes, the plurality of power transfer modes comprising at least a USB-compliant power transfer mode and a second power transfer mode, the second power transfer mode configured to transfer power substantially in excess of the USB-compliant power transfer mode.

26. The multipurpose interface of claim 25, wherein the first interface comprises an optical interface adapted to perform the data transfer of the second interface.

27. The multipurpose interface of claim 25, wherein the plurality of power transfer modes further comprises a mode adapted for charging a second device.

28. A storage apparatus for use with a computerized device, comprising:

a storage medium having a computer program stored thereon, the program configured to, when executed by the computerized device;

classify an attached device and the computerized device according to one from the group consisting of a charging device, a chargeable device, and a both charging and chargeable device, the attached device being attached via an interface of the computerized device;

determine a required power level for the attached device; and

enable power output from the charging device to the chargeable device at the required power level via the interface;

an output power rail configurable to deliver power at a plurality of power output levels when the storage apparatus is classified as a charging device, the delivered power comprising a delivered power control command; and

an input power rail configurable to receive power when the storage apparatus is classified as a chargeable device, the received power comprising a received power control command.

29. The storage apparatus of claim 28, wherein the execution of the program is substantially in response to coupling the attached device to the interface.

30. The storage apparatus of claim 28, wherein the interface is configurable for delivering power at a plurality of power levels, the plurality of power levels comprising:

(i) a low power level that is substantially compliant with a high-speed serialized bus protocol yet incapable of supplying the required power level; and

(ii) a high power level capable of supplying the required power level.

31. A client peripheral apparatus configured to interface with a host computerized device, the client peripheral apparatus having no indigenous power source, the client peripheral apparatus comprising:

a first logic configured to negotiate with the host device to obtain first electrical power via an interface, the first electrical power sufficient to power the client peripheral apparatus during a normal mode of operation; and

a second logic configured to enable obtaining second electrical power sufficient to power the first logic, but insufficient to power the client peripheral apparatus in the normal mode, wherein

the client peripheral apparatus is configured to receive a power control command to select an enhanced power mode from the group consisting of;

a power delivered over a different medium, a power of a different frequency, a power of a different phase, and a power that has been conditioned.

32. The client peripheral apparatus of claim 31, wherein the first logic negotiates with the host using a data signal path of the interface.

33. The client peripheral apparatus of claim 32, wherein the negotiation with the host using a data signal path of the interface comprises negotiation according to a simplified message exchange protocol.

34. The client peripheral apparatus of claim 33, wherein the simplified message exchange protocol is resident on the client apparatus and is also used for a function other than the power negotiation.

35. The client peripheral apparatus of claim 31 wherein a power that has been conditioned comprises one of the group consisting of:

a power that has been filtered, a power that has been rectified, and a power that has been shaped.

36. A device interface enabling a single cable to be used for transmitting electrical power and data between first and second computerized devices, the interface comprising:

a data path;

a power path sufficiently proximate to the data path within the interface so that the single cable can complete both the data path and the power path between the first and second computerized devices; and

a power transceiver for negotiating power delivery from one of the first and second computerized devices to the other, wherein;

negotiation of power delivery over the cable is performed substantially independent from software application traffic sent over the data path, and is performed classifying the first and the second computerized device as one from the group consisting of a charging device, a chargeable device, and a both charging and chargeable device,

the power transceiver is configured to drain power from the charging device to the chargeable device, and the power path comprises;

an input power rail coupled to a demodulator configured to demodulate a power control command in the first computerized device, and

an output power rail coupled to a modulator configured to modulate the power control command in the second computerized device.

37. The interface of claim 36, wherein the electrical power is sufficient to provide at least one of (i) charging of a battery of the one of the first and second computerized devices receiving the electrical power, and/or (ii) powering substantially all functions of the one of the first and second devices receiving the electrical power in a normal operating mode for at least a period of time.

38. The interface of claim 36, wherein the negotiation of power delivery over the cable is performed over the power path.

39. The interface of claim 36, wherein the negotiation of power delivery over the cable is performed over the data path, and the negotiation comprises use of a low bandwidth protocol.