Electrical lighting system power control
AssigneeKoninkiijke Philips N.V.
InventorXiangyu Wang
Life of this patent
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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.
Claims15
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).
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.
(canceled)
Dependencies are inferred from the claim text.