Method and apparatus for sharing battery charging resources

• US 20050242768A1
• Filed: 04/28/2004
• Published: 11/03/2005
• Est. Priority Date: 04/28/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Byrne, Daniel J., Pandit, Amol S.
• Application Number:
  US10/835,575
• Publication Number:
  US 20050242768A1
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H02J 7/0018 using separate charge circuits
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Devices sharing battery charging resources coordinate use of a high-current charging mode through use of a message protocol between the devices. While a high-priority device is using the high-current charging mode, the other devices may continue charging in a reduced-current charging mode.

Claims

1. A method for sharing battery charging resources between a first device and a second device, comprising:

electrically connecting the first device and the second device with the battery charging resources, the first device and the second device being in communication with each other; and

coordinating use of the battery charging resources by the first device and the second device through use of a message protocol between the first device and the second device.

2. The method of claim 1, wherein the message protocol gives the first device priority over the second device in the use of a current-regulation charging mode until the first device has completed a current-regulation charging phase.

3. The method of claim 2, wherein the second device continues to charge in a reduced-current charging mode while the first device is in the current-regulation charging phase.

4. The method of claim 2, wherein coordinating use of the battery charging resources by the first device and the second device through use of a message protocol between the first device and the second device comprises:

sending a message from the first device to the second device informing the second device that the first device requires use of the current-regulation charging mode;

switching the second device to a reduced-current charging mode;

sending an acknowledgement from the second device to the first device; and

charging the first device in the current-regulation charging mode.

5. The method of claim 4, further comprising:

switching the first device to a voltage-regulation charging mode, when the first device has completed the current-regulation charging phase;

sending a command from the first device to the second device informing the second device that the first device no longer requires use of the current-regulation charging mode; and

switching the second device to the current-regulation charging mode.

6. The method of claim 2, wherein the first device is a digital camera and the second device is a docking station, the docking station having a secondary charging bay to charge a secondary battery.

7. The method of claim 2, wherein the first device is a docking station and the second device is a digital camera.

8. The method of claim 1, wherein the battery charging resources comprise a single AC/DC adapter.

9. A system, comprising:

battery charging resources;

a first device and a second device, the first device and the second device being electrically connected with the battery charging resources, the first device and the second device being in communication with each other; and

wherein the first device and the second device are configured to coordinate use of the battery charging resources by the first device and the second device through use of a message protocol between the first device and the second device.

10. The system of claim 9, wherein the message protocol gives the first device priority over the second device in the use of a current-regulation charging mode until the first device has completed a current-regulation charging phase.

11. The system of claim 10, wherein the second device is configured to continue charging in a reduced-current charging mode while the first device is in the current-regulation charging phase.

12. The system of claim 10, wherein the system is programmed to perform the following method:

sending a message from the first device to the second device informing the second device that the first device requires use of the current-regulation charging mode;

switching the second device to a reduced-current charging mode;

sending an acknowledgement from the second device to the first device; and

charging the first device in the current-regulation charging mode.

13. The system of claim 12, wherein the method further comprises:

switching the first device to a voltage-regulation charging mode, when the first device has completed the current-regulation charging phase;

sending a command from the first device to the second device informing the second device that the first device no longer requires use of the current-regulation charging mode; and

switching the second device to the current-regulation charging mode.

14. The system of claim 10, wherein the first device is a digital camera and the second device is a docking station, the docking station having a secondary charging bay to charge a secondary battery

15. The system of claim 10, wherein the first device is a docking station and the second device is a digital camera.

16. The system of claim 9, wherein the battery charging resources comprise a single AC/DC adapter.

17. A device, comprising:

a communication interface to communicate with an external device;

a rechargeable battery; and

battery charging protocol logic to control charging of the rechargeable battery, the battery charging protocol logic being configured to send messages to and receive messages from the external device via the communication interface, the messages coordinating use of battery charging resources shared by the device and the external device.

18. The device of claim 17, wherein the battery charging protocol logic is configured to give the device priority over the external device in the use of a current-regulation charging mode until the device has completed a current-regulation charging phase.

19. The device of claim 18, wherein the battery charging protocol logic is configured such that the external device continues to charge in a reduced-current charging mode while the device is in the current-regulation charging phase.

20. The device of claim 18, wherein the device is a digital camera and the external device is a docking station, the docking station having a secondary charging bay to charge a secondary battery

21. The device of claim 18, wherein the device is a docking station and the external device is a digital camera.

22. The device of claim 17, wherein the rechargeable battery is a lithium ion battery.

25. The device of claim 18, wherein the means for controlling charging of a rechargeable battery is configured such that the external device continues to charge in a reduced-current charging mode while the device is in the current-regulation charging phase.

23. A device, comprising:

means for communicating with an external device; and

means for controlling charging of a rechargeable battery, the means for controlling charging of a rechargeable battery being configured to send messages to and receive messages from the external device via the means for communicating with an external device, the messages coordinating use of battery charging resources shared by the device and the external device.

24. The device of claim 23, wherein the means for controlling charging of a rechargeable battery is configured to give the device priority over the external device in the use of a current-regulation charging mode until the device has completed a current-regulation charging phase.