Methods and apparatus for monitoring a power source

• US 7,228,447 B1
• Filed: 09/19/2002
• Issued: 06/05/2007
• Est. Priority Date: 09/19/2002
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Day, Mark Stuart
• Primary Examiner(s): Perveen; Rehana
• Assistant Examiner(s): CHEN, TSE W
• Application Number:
  US10/247,052
• Time in Patent Office: 1,720 Days
• Field of Search: 713/300, 713/340
• US Class Current: 713/340
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision

Abstract

A power source is configured to notify an external monitoring device of a condition such as a low power condition of the power source. The power source has an associated controller that monitors the condition of the power source. The power source receives a first threshold condition for a power source, establishes a communications channel with an external monitoring device, transmits a notification related to the first threshold condition of the power source to the external monitoring device through the communications channel and discontinues the established communications channel based on a reception condition of the external monitoring device. The controller terminates notification after reception of an acknowledgment sent by the external monitoring device or after an elapsed time. The communications channel can be a wireless communications channels or can be a network such as the Internet.

Claims

1. In a controller associated with a power source module having a battery and a communications interface electrically coupled to the controller, the power source module disposed within a battery-powered sign, a method for notifying an external monitoring device of a power condition of the battery, the method comprising:

detecting that a power level of the battery has reached a threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level;

activating the communications interface to establish a communications channel with the external monitoring device in response to detecting that the power level of the battery has reached the threshold condition;

transmitting a notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel, the notification indicating that the power source module disposed within the battery-powered sign requires replacement; and

deactivating the communications interface to discontinue the established communications channel based on a reception condition related to the external monitoring device;

wherein the power source module comprises the battery, the controller, and the communications interface as part of a replaceable unit;

detecting comprises detecting that the power level of the battery has reached the threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level, the threshold condition being configured as the power level of the battery that permits continued operation of the battery powered device for a time period sufficient to allow replacement of the battery;

activating the communications interface comprises activating the communications interface to establish a communications channel with the external monitoring through the Internet, activating further comprising

initiating a Dynamic Host Configuration Protocol request to obtain an Internet Protocol address, and

opening a Hyper Text Transfer Protocol connection with the external monitoring device;

transmitting the notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel comprises;

generating the notification, the notification indicating that the power source module disposed within the battery-powered sign requires replacement,

including a Media Access Control (MAC) address and a Globally Unique Identifier (GUID) with the notification to identify a location of the power source module on the Internet; and

transmitting the notification to the external monitoring device using the Hyper Text Transfer Protocol; and

deactivating the communications interface to discontinue the established communications channel comprises;

terminating operation of the communications interface to discontinue the established communications channel to reduce consumption of power from the battery by the communications interface.

2. The method of claim 1 wherein the step of deactivating the communications interface comprises:

deactivating the communications interface to discontinue the established communications channel based upon reception of an acknowledgment from the external monitoring device, the acknowledgment indicating receipt of the notification.

3. The method of claim 1 wherein the step of deactivating the communications interface comprises:

deactivating the communications interface to discontinue the established communications channel based upon the passage of a predetermined time prior to reception of an acknowledgment from the external monitoring device, the acknowledgment indicating receipt of the notification.

4. The method of claim 1 wherein the step of transmitting the notification comprises:

sending the notification as a wireless signal, to the external monitoring device, the communications interface configured as a wireless transmission device.

5. The method of claim 1 wherein the step of transmitting the notification comprises:

sending the notification, to the external monitoring device, according to a procedure defined by at least one network protocol.

6. The method of claim 1, further comprising:

obtaining, from a storage location, a network address of the external monitoring device; and

wherein activating the communications interface comprises activating the communications interface to access the external monitoring device using the network address of the external monitoring device.

7. The method of claim 1 wherein the step of transmitting the notification further comprises:

obtaining location information for the power source module from a storage location, the location information indicating a geographic location of the battery-powered sign; and

sending the location information for the power source to the external monitoring device as part of the notification.

8. The method of claim 1, further comprising:

retrieving, from a storage location, a network address for the power source module; and

associating the network address with the power source module.

9. The method of claim 1 wherein the threshold is a first threshold, further comprising:

detecting that the power level of the battery has reached at least a second threshold condition, the second threshold condition having a value that is less than the first threshold condition of the battery, the second threshold condition indicating a decline in a power level of the battery from the first threshold condition of the battery; and

in response to detecting the second threshold condition, activating the communications interface to establish a communications channel with the external monitoring device and transmitting a notification, related to the second threshold condition, to the external monitoring device via the communications interface.

20. A method according to claim 1, wherein the controller receives operating power from the battery.

22. The method of claim 1, wherein the notification comprises a “

change me”

message.

10. A power source module of a battery-powered sign, the power source module, comprising:

a battery configured to provide power to the battery-powered sign;

a controller electrically coupled to the battery and to a communications interface, the controller configured to;

detect that a power level of the battery has reached a threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level;

activate the communications interface to establish a communications channel with an external monitoring device in response to detecting that the power level of the battery has reached the threshold condition;

transmit a notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel, the notification indicating that the power source module disposed within the battery-powered sign requires replacement; and

deactivate the communications interface to discontinue the established communications channel based on a reception condition related to the external monitoring device;

wherein the battery, the controller, and the communications interface are part of a replaceable unit and wherein the controller is configured to;

when detecting, detect that the power level of the battery has reached the threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level, the threshold condition being configured as the power level of the battery that permits continued operation of the battery powered device for a time period sufficient to allow replacement of the battery;

when activating the communications interface, activate the communications interface to establish a communications channel with the external monitoring through the Internet and;

initiate a Dynamic Host Configuration Protocol request to obtain an Internet Protocol address, and

open a Hyper Text Transfer Protocol connection with the external monitoring device;

when transmitting the notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel;

generate the notification, the notification indicating that the power source module disposed within the battery-powered sign requires replacement,

include a Media Access Control (MAC) address and a Globally Unique Identifier (GUID) with the notification to identify a location of the power source module on the Internet; and

transmit the notification to the external monitoring device using the Hyper Text Transfer Protocol; and

when deactivating the communications interface to discontinue the established communications channel;

terminate operation of the communications interface to discontinue the established communications channel to reduce consumption of power from the battery by the communications interface.

11. The power source module of claim 10 wherein the controller is configured to, when deactivating the communications interface:

deactivate the communications interface to discontinue the established communications channel based upon reception of an acknowledgment from the external monitoring device, the acknowledgment indicating receipt of the notification.

12. The power source module of claim 10 wherein the controller is configured to, when deactivating the communications interface:

deactivating the communications interface to discontinue the established communications channel based upon the passage of a predetermined time prior to reception of an acknowledgment from the external monitoring device, the acknowledgment indicating receipt of the notification.

13. The power source module of claim 10 wherein the communications interface is configured to:

transmit the notification as a wireless signal, to the external monitoring device, using a wireless transmission device, the communications interface configured as the wireless transmission device.

14. The power source module of claim 10 wherein the communications interface is configured to:

transmit the notification, to the external monitoring device, according to a procedure defined by at least one network protocol.

15. The power source module of claim 10 wherein the controller is configured to:

obtain, from a storage location, a network address of the external monitoring device; and

when activating the communications interface, activate the communications interface to access the external monitoring device using the network address of the external monitoring device.

16. The power source module of claim 10 wherein the communications interface is configured to:

obtain location information for the power source module from a storage location, the location information indicating a geographic location of the battery-powered sign; and

send the power source module location information to the external monitoring device as part of the notification.

17. The power source module of claim 10 wherein the communications interface is configured to:

retrieve a network address for the power source module; and

associate the network address with the power source module.

18. The power source module of claim 10, wherein the threshold is a first threshold and wherein the power source module is configured to:

detect that the power level of the battery has reached at least a second threshold condition, the second threshold condition having a value that is less than the first threshold condition of the battery, the second threshold condition indicating a decline in a power level of the battery from the first threshold condition of the battery; and

in response to detecting the second threshold condition, activate the communications interface to establish a communications channel with the external monitoring device and transmit a notification, related to the second threshold condition, to the external monitoring device via the communications interface.

21. A power source module according to claim 10, wherein the controller receives operating power from the battery.

23. The power source module of claim 10, wherein the notification comprises a “

change me”

message.

19. A system for monitoring a condition of a battery-powered sign comprising:

a power source module having a controller, a communications interface coupled to the controller, and a battery coupled to the controller; and

an external monitoring device coupled to the power source module, via the communications interface, through a network

wherein the controller of the power source module is configured to;

detect that a power level of the battery has reached a threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level;

activate the communications interface to establish a communications channel with an external monitoring device in response to detecting that the power level of the battery has reached the threshold condition;

transmit a notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel, the notification indicating that the power source module disposed within the battery-powered sign requires replacement; and

deactivate the communications interface to discontinue the established communications channel based on a reception condition related to the external monitoring device;

wherein the controller of the power source module is configured to;

when detecting, detect that the power level of the battery has reached the threshold condition, the threshold condition indicating a decrease in power of the battery relative to an initial power level, the threshold condition being configured as the power level of the battery that permits continued operation of the battery powered device for a time period sufficient to allow replacement of the battery;

when activating the communications interface, activate the communications interface to establish a communications channel with the external monitoring through the Internet and;

initiate a Dynamic Host Configuration Protocol request to obtain an Internet Protocol address, and

open a Hyper Text Transfer Protocol connection with the external monitoring device;

when transmitting the notification, related to the threshold condition of the battery, to the external monitoring device through the communications channel;

generate the notification, the notification indicating that the power source module disposed within the battery-powered sign requires replacement,

include a Media Access Control (MAC) address and a Globally Unique Identifier (GUID) with the notification to identify a location of the power source module on the Internet; and

transmit the notification to the external monitoring device using the Hyper Text Transfer Protocol; and

when deactivating the communications interface to discontinue the established communications channel;

terminate operation of the communications interface to discontinue the established communications channel to reduce consumption of power from the battery by the communications interface.

24. The system of claim 19 for monitoring a condition of a battery-powered sign, wherein the notification comprises a “

change me”

message.