Electrical lighting system power control
First Claim
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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; and
a 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; and
in 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.
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Accused Products
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 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.
35 Citations
7 Claims
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1. A device comprising:
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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; and a 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; and in 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification