ELECTRICAL LIGHTING SYSTEM POWER CONTROL

• US 20140232299A1
• Filed: 10/05/2012
• Published: 08/21/2014
• Est. Priority Date: 10/06/2011
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Wang, Xiangyu
• Granted Patent: US 10,034,340 B2
• Time in Patent Office: Days
• US Class Current: 315/362
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 41/0833 for reduction of network energy consumption
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 47/18 via data-bus transmission
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A network switch (5) for example a PoE switch, is operable to control supply of electrical power to individual luminaires (1,2) in a lighting network. The luminaires receive both electrical power for operation and signals to switch on and off through a common cable connection (9) such as an Ethernet connection. When switched on, each luminaire sends a signal repeatedly towards the Po E switch until switched off and the switch (5) supplies power to the luminaire whilst successive signals are received within a period less than a predetermined shut off period (Δ). In this way, power to the luminaire can be disconnected to avoid comsumption of standby power when not in use.

Claims

1. A network switch operable to control supply of electrical power to a network device the switch being configured to supply power to the network device upon receiving a signal destined for the network device and continuing to supply power to the network device whilst successive signals from the network device are received within a period less than a predetermined shut off period (Δ

).

2. The network switch according to claim 1, wherein the network switch is configured to operate to receive a command signal from a remote switching device that commands the device to switch on, and in response, to switch on power for the device.

3. The network switch according to claim 2, wherein the network switch is configured to operate to route the command signal to the device.

4. The network switch according to claim 2, further including an input/output to be connected to an Ethernet cable for supplying power to the device and receiving signals from the device.

5. The network switch according to claim 3, further including a plurality of input/outputs for connection to a plurality of network devices, said plurality of input/outputs comprising a respective switching element for switching power to the devices individually, a mains AC power supply input, and a AC/DC power supply for providing DC power to be switched by the switching elements selectively to the devices.

6. The network switch according to claim 5, further including a processor responsive to the signals received from the devices to operate the switching elements to supply power to the devices when received within said shut off period.

10. A network including at least one network switch as claimed in claim 1 and a plurality of devices configured to receive from a remote location both electrical power for operation and a command signal to switch on through a common cable connection, and in response to switching on, to send to the remote location a signal repeatedly until switched off.

11. The network according to claim 10, wherein the plurality devices have individual network addresses and the command signals to switch on include the 1 addresses of the devices to be switched on, said switch being responsive to said addresses for controlling the supply of power to the devices.

13. A method of operating a network switch to control supply of electrical power to a device according to claim 1.

7. A device configured to receive from a remote location both electrical power for operation and a command signal to switch on through a common cable connection, and in response to switching on, to send to the remote location a signal repeatedly until switched off.

8. The device according to claim 7, further comprising a luminaire for operating a lighting device, including a switch for controlling operation of the lighting device, a processor configured to operate the switch to turn on the lighting device in response to the command signal and to repeatedly send signals through the common cable connection to the remote location until the switch is turned off.

9. The device according to claim 7, wherein the common cable connection is configured to receive an Ethernet cable.

14. A method of operating a device coupled to a network switch according to claim 7.

15. The method according to claim 14, further including receiving a switch off command through the common connection and ceasing the sending of signals in response to the switch off command.

12. (canceled)