Low power detection and power loss management for devices with limited available power

1 . A method of power management in a device including a display and configured to be operable for power stealing from a system, the method comprising:

automatically detecting a loss or inadequate level of power stealing from the system, the detection including determining that available power stealing from the system is inadequate for full operational capability of the device;

automatically turning off power to the display in response to detection of the loss or inadequate level of power stealing from the system; and

in response to detection of the loss or inadequate level of power stealing from the system, the method includes automatically and in a prescribed sequence turning off power to (i) the display, (ii) a backlight of the device, and (iii) a Wi-Fi radio of the device, wherein power to the display is turned off before any notification, message, or alert is sent, such that the display becomes completely dark without any illuminated indicia.

2 . The method of claim 1 , wherein

automatically detecting a loss or inadequate level of power stealing from the system comprises algorithmically detecting, via a firmware-executed power-stealing evaluation algorithm, a loss or inadequate level of power stealing from the system.

3 . The method of claim 1 , wherein:

the device comprises a thermostat configured to be operable for power stealing from an HVAC system;

automatically detecting a loss or inadequate level of power stealing from the system comprises automatically detecting a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the detection including determining that available power stealing by the thermostat from the HVAC system is inadequate for full operational capability of the thermostat; and

automatically turning off power to the display comprises automatically turning off power to a display of the thermostat in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system.

4 . The method of claim 1 , wherein automatically detecting a loss or inadequate level of power stealing from the system comprises algorithmically detecting, via a firmware-executed power-stealing evaluation algorithm, a loss or inadequate level of power stealing from the system, the detection including determining that the available power stealing falls below a threshold required for full operational capability of the device over a defined evaluation interval.

5 . The method of claim 1 , wherein automatically turning off power to the display comprises the device automatically turning off power to its display in response to detection of the loss or inadequate level of power stealing from the system.

6 . The method of claim 1 , wherein automatically turning off power to the display comprises automatically turning off power to the display without manual user intervention in response to detection of the loss or inadequate level of power stealing from the system.

7 . The method of claim 1 , wherein the method includes automatically turning off power to the display and a backlight of the device in response to detection of the loss or inadequate level of power stealing from the system such that the display is completely dark, blank, and/or without any illuminated user message or other indicia left on the display.

8 . The method of claim 1 , wherein the method includes automatically turning off power to the display in response to detection of the loss or inadequate level of power stealing from the system, before sending a notification, message, and/or alert about turning off power to the display.

9 . The method of claim 8 , wherein after automatically turning off power to the display, the method includes sending a notification, message, and/or alert that the power has been turned off to the display.

10 . The method of claim 1 , wherein the method includes automatically turning off power to the display and the backlight of the device in response to detection of the loss or inadequate level of power stealing from the system, before sending a notification, message, and/or alert about turning off power to the display and the backlight of the device.

11 . The method of claim 10 , wherein after automatically turning off power to the display and the backlight of the device, the method includes sending a notification, message, and/or alert that the power has been turned off to the display and the backlight of the device.

12 . The method of claim 1 , wherein the method includes automatically turning off the Wi-Fi radio or internet radio of the device if necessary for the device to have sufficient power to continue to control the system in response to detection of the loss or inadequate level of power stealing from the system.

13 . The method of claim 1 , wherein:

the device comprises a thermostat including a display and a Wi-Fi radio, the thermostat configured to be operable for power stealing from an HVAC system;

automatically detecting a loss or inadequate level of power stealing from the system comprises automatically detecting a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the detection including determining that available power stealing by the thermostat from the HVAC system is inadequate for full operational capability of the thermostat; and

automatically turning off power to the display comprises the thermostat automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system; and

the method further includes the thermostat automatically turning off its Wi-Fi radio if necessary for the thermostat to have sufficient power to continue to control the HVAC system in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system.

14 . A method of power management in a device including a display and configured to be operable for power stealing from a system, the method comprising:

automatically detecting a loss or inadequate level of power stealing from the system, the detection including determining that available power stealing from the system is inadequate for full operational capability of the device;

automatically turning off power to the display in response to detection of the loss or inadequate level of power stealing from the system;

wherein in response to detection of the loss or inadequate level of power stealing from the system, the method includes:

automatically shutting off power to the display as a first-priority action, such that the display becomes completely dark without illuminated user indicia;

automatically shutting off power to a backlight of the device as a second-priority action;

automatically shutting off a Wi-Fi radio of the device as a third-priority action, only after determining that continued Wi-Fi operation would otherwise compromise system control; and

after the display is completely dark, sending a notification to a cloud server indicating that the display has been turned off.

15 . A method of power management in a device including a display and configured to be operable for power stealing from a system, the method comprising:

automatically detecting a loss or inadequate level of power stealing from the system, the detection including determining that available power stealing from the system is inadequate for full operational capability of the device;

automatically turning off power to the display in response to detection of the loss or inadequate level of power stealing from the system;

wherein the method includes automatically turning off power to the display in response to detection of the loss or inadequate level of power stealing from the system such that the display is completely dark, blank, and/or without any illuminated user message or other indicia left on the display, wherein the display is maintained in the dark state without any subsequent periodic illumination or warning display until restoration of adequate available power stealing from the system for full operational capability of the device, and wherein the device comprises a non-rechargeable battery backup for operating in non-constant power conditions.

16 . A method of power management in a thermostat including a display and configured to be operable for power stealing from an HVAC system, the method comprising:

automatically detecting a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the detection including determining that available power stealing by the thermostat from the HVAC system is inadequate for full operational capability of the thermostat;

the thermostat automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, whereby the display of the thermostat is completely dark, blank, and/or without any illuminated user message or other indicia left on the display;

in response to detection of the loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the method includes:

automatically shutting off power to the display as a first-priority action, such that the display becomes completely dark without illuminated user indicia;

automatically shutting off power to a backlight of the thermostat as a second-priority action;

automatically shutting off a Wi-Fi radio of the thermostat as a third-priority action, only after determining that continued Wi-Fi operation would otherwise compromise HVAC control; and

after the display is completely dark, sending a notification to a cloud server indicating that the display has been turned off.

17 . The method of claim 16 , wherein:

the method includes the thermostat automatically turning off its Wi-Fi radio if necessary for the thermostat to have sufficient power to continue to control the HVAC system in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system.

18 . The method of claim 16 , wherein:

the method includes the thermostat automatically turning off power to its backlight in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system.

19 . The method of claim 16 , wherein the method includes:

the thermostat automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, before the thermostat sends a notification, message, and/or alert about turning off power to the display; and

after the thermostat automatically turns off power to its display, the method includes the thermostat sending a notification, message, and/or alert that the power has been turned off to the display.

20 . A device comprising a display and configured to be operable for power stealing from a system, the device configured to be operable for:

automatically detecting a loss of power stealing and/or inadequate power stealing by the device from the system, the detection including determining that available power stealing by the device from the system is inadequate for full operational capability of the device;

automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the device from the system, whereby the display of the device is completely dark, blank, and/or without any illuminated user message or other indicia left on the display;

in response to detection of the loss or inadequate level of power stealing by the device from the system, the device is configured to be operable for:

automatically shutting off power to the display as a first-priority action, such that the display becomes completely dark without illuminated user indicia;

automatically shutting off power to a backlight of the device as a second-priority action;

automatically shutting off a Wi-Fi radio of the device as a third-priority action, only after determining that continued Wi-Fi operation would otherwise compromise system control; and

after the display is completely dark, sending a notification to a cloud server indicating that the display has been turned off.

21 . The device of claim 20 , wherein:

the device is configured to be operable for automatically turning off its Wi-Fi radio if necessary for the device to have sufficient power to continue to control the system in response to detection of a loss of power stealing and/or inadequate power stealing by the device from the system.

22 . The device of claim 20 , wherein:

the device is configured to be operable for automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the device from the system, before the device sends a notification, message, and/or alert about turning off power to the display; and

after the device automatically turns off power to its display, the device is configured to be operable for sending a notification, message, and/or alert that the power has been turned off to the display.

23 . A thermostat comprising a display and configured to be operable for power stealing from an HVAC system, the thermostat configured to be operable for:

automatically detecting a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the detection including determining that available power stealing by the thermostat from the HVAC system is inadequate for full operational capability of the thermostat;

automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, whereby the display of the thermostat is completely dark, blank, and/or without any illuminated user message or other indicia left on the display;

in response to detection of the loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, the thermostat is configured to be operable for:

automatically shutting off power to the display as a first-priority action, such that the display becomes completely dark without illuminated user indicia;

automatically shutting off power to a backlight of the thermostat as a second-priority action;

automatically shutting off a Wi-Fi radio of the thermostat as a third-priority action, only after determining that continued Wi-Fi operation would otherwise compromise HVAC control; and

after the display is completely dark, sending a notification to a cloud server indicating that the display has been turned off.

24 . The thermostat of claim 23 , wherein:

the thermostat is configured to be operable for automatically turning off its Wi-Fi radio if necessary for the thermostat to have sufficient power to continue to control the HVAC system in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system.

25 . The thermostat of claim 23 , wherein:

the thermostat is configured to be operable for automatically turning off power to its display in response to detection of a loss of power stealing and/or inadequate power stealing by the thermostat from the HVAC system, before the thermostat sends a notification, message, and/or alert about turning off power to the display; and

after the thermostat automatically turns off power to its display, the thermostat is configured to be operable for sending a notification, message, and/or alert that the power has been turned off to the display.