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Electrical lighting system power control

專利號(hào)
US10034340B2
公開(kāi)日期
2018-07-24
申請(qǐng)人
PHILIPS LIGHTING HOLDING B.V.（NL Eindhoven）
發(fā)明人
Xiangyu Wang
IPC分類(lèi)
H05B33/08; H04L12/10; H04L12/12; H04L12/24; H04L12/46; H05B37/02; H04L12/26
技術(shù)領(lǐng)域
luminaires,poe,luminaire,switch,power,network,dc,in,lighting,alive
地域： Eindhoven

摘要

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 while 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 consumption of standby power when not in use.

說(shuō)明書(shū)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CROSS-REFERENCE TO PRIOR APPLICATIONS

This application is the U.S. National Phase application under 35 U.S.C. § 371 of International Application No. PCT/IB2012/055359, filed on Oct. 5, 2012, which claims the benefit of U.S. Provisional Application No. 61/543,861, filed on Oct. 6, 2011. These applications are hereby incorporated by reference herein.

FIELD OF THE INVENTION

This invention relates to electrical power control for lighting systems and has particular but not exclusive application to Power over the Ethernet (PoE) lighting systems.

BACKGROUND OF THE INVENTION

Some electrical lighting units such as LED luminaires can be driven at a lower voltage than a conventional mains AC supply, making low voltage.power distribution feasable in a lighting network.

PoE has been developed for supplying low voltage power from a source such as a PoE switch, to a powered device such as a wi-fi access point or video camera, through the same Ethernet cable that carries signals to and from the device. This greatly simplifies installation of networked devices because only one cable is needed for both power and communication. Power is typically supplied from a PoE switch in common mode over the differential pairs of wires found in Ethernet cables. The IEEE 802.3at-2009 PoE standard permits up to 25.5 W of power to be supplied to the network powered devices. Also, non-standardized PoE schemes have been proposed and implemented hitherto.

權(quán)利要求

1
The invention claimed is:1. A device comprising:a common cable connection,wherein the device receives, from a network switch, both electrical power for operation and a command signal to switch on through the common cable connection;a luminaire for operating a lighting unit; anda processor communicatively coupled to said luminaire and said common cable connection, wherein the processor is configured to control said device such that said device:in response to receiving the command to switch on, turns on the lighting unit,in response to switching on, sends to the network switch a second signal repeatedly; andin response to receiving, from the network switch, a command signal to switch off, initiates switching off of the processor and power cut off for the device, by ceasing sending of said second signal to the network switch,wherein ceasing the sending of said second signal causes the network switch to stop supplying the electrical power to the device through the common cable connection.2. The device according to claim 1, further comprisinga first switch for controlling operation of the lighting unit,wherein the processor is configured to operate the first switch to turn on the lighting unit in response to the command signal to switch on and to repeatedly send signals through the common cable connection to the network switch until the first switch is turned off.3. The device according to claim 2,wherein the common cable connection is configured to receive an Ethernet cable.4. The device according to claim 1,wherein the device is a Power over the Ethernet (PoE) device, andwherein the electrical power and the second signal are transmitted via at least one Ethernet cable.5. A method of operating the device according to claim 1, said method comprising:receiving from the network switch both electrical power for operation and the command signal to switch on through the common cable connection;in response to switching on, sending to the network switch the second signal repeatedly; andin response to receiving the command signal to switch off, initiating switching off of the processor, and power cut off for the device, by ceasing sending of said second signal to the network switch.6. The method of claim 5,wherein the ceasing causes the network switch to stop providing the electrical power to the device.7. A system comprising the device of claim 1, which is a first device, and comprising a second device that is the network switch,wherein the second device provides said electrical power to the first device, receives the second signal repeatedly and stops providing the electrical power to the first device in response to said ceasing.
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