Power failure reporting in a networked light

• US 8,115,397 B2
• Filed: 01/04/2011
• Issued: 02/14/2012
• Est. Priority Date: 01/04/2011
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Greenwave Reality, Pte Ltd. (Greenwave Reality, Inc.)
• Inventors: Jonsson, Karl
• Primary Examiner(s): Le, Tung X
• Application Number:
  US12/984,583
• Publication Number:
  US 20110163668A1
• Time in Patent Office: 406 Days
• Field of Search: 315/86, 315/88, 315/90, 315/129, 315/291, 315/294, 315/297, 315/307, 315/312, 315/318
• US Class Current: 315/129
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21S 9/022 Emergency lighting devices
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

Power is stored in a networked light allowing the networked light to send a message over the network providing information that the networked light is turning off if external power is no longer available.

Claims

1. A method for reporting a state of a networked lighting apparatus, the method comprising:

storing energy in the networked lighting apparatus;

detecting that an external power source has stopped providing power to the networked lighting apparatus; and

sending a network message from the networked lighting apparatus in response to said detection that the external power source has stopped providing power to the networked lighting apparatus, said network message comprising data indicating that the networked lighting apparatus is entering an off state;

wherein said stored energy is sufficient to power at least a portion of the networked lighting apparatus for a period of time long enough to send said network message.

2. The method of claim 1 further comprising:

turning off a light emitting element, wherein the light emitting element is turned off before said network message is sent.

3. The method of claim 1 wherein said network message is sent more than once.

4. The method of claim 1 wherein said network message is sent over a radio frequency network.

5. The method of claim 4 wherein said radio frequency network utilizes a Zigbee protocol.

6. The method of claim 1 further comprising:

changing a state of another networked device in response to said network message.

7. A lighting apparatus comprising:

at least one light emitting element;

a networked controller configured to communicate over a network and to control an on/off state of the at least one light emitting element;

power conversion circuitry configured to receive power from an external power connection and provide power for the at least one light emitting element;

an energy storage device configured to store energy from the power conversion circuitry; and

power detection circuitry configured to send a power fail indication to the networked controller if the external power connection stops providing power to the lighting apparatus;

wherein the networked controller is configured to send a message over the network in response to the power fail indication while being powered by the energy storage device, said network message indicating that the lighting apparatus is entering an off state.

8. The lighting apparatus of claim 7 wherein the at least one light emitting element comprises a light emitting diode (LED).

9. The lighting apparatus of claim 7 wherein the energy storage device comprises one or more capacitors.

10. The lighting apparatus of claim 7 wherein the energy storage device comprises a rechargeable battery.

11. The lighting apparatus of claim 7 wherein the network controller is further configured to turn off the at least one light emitting element before said network message is sent.

12. The lighting apparatus of claim 7 wherein said network message is sent over a radio frequency network.

13. The lighting apparatus of claim 12 wherein said radio frequency network utilizes a Zigbee protocol.

14. A light bulb comprising:

at least one light emitting element;

a networked controller configured to communicate over a network and to control an on/off state of the at least one light emitting element;

power conversion circuitry configured to receive power from an external power connection through a base and provide power for the at least one light emitting element;

an energy storage device configured to store power from the power conversion circuitry;

power detection circuitry configured to send a power fail indication to the networked controller if the external power connection stops providing power to the light bulb; and

a shell connected to the base and containing the at least one light emitting element, the networked controller, the power conversion circuitry, the energy storage device and the power detection circuitry, said shell at least partially transparent and substantially the same size and shape as a typical incandescent light bulb;

wherein the networked controller is configured to send a message over the network in response to the power fail indication while being powered by the energy storage device, said network message indicating that the light bulb is entering an off state.

15. The light bulb of claim 14 wherein the at least one light emitting element comprises a light emitting diode (LED).

16. The light bulb of claim 14 wherein the energy storage device comprises one or more capacitors.

17. The light bulb of claim 14 wherein the energy storage device comprises a rechargeable battery.

18. The light bulb of claim 14 wherein the network controller is further configured to turn off the at least one LED, wherein the at least one light emitting element is turned off before said network message is sent.

19. The light bulb of claim 14 wherein said network message is sent over a radio frequency network.

20. The light bulb of claim 19 wherein said radio frequency network utilizes a Zigbee protocol.