Power over Ethernet emergency lighting system and method of detecting power loss of a link segment thereof
First Claim
1. A power over Ethernet emergency luminaire, comprising:
- a first power over Ethernet input connected to a power over Ethernet (“
POE”
) port link segment;
a rechargeable emergency battery pack having a battery charger, a rechargeable battery and an emergency LED driver connected to a first input of a relaying device having a first and a second input alternatively switchable to an output;
a normal lighting LED driver connected to the second input of the relaying device;
an LED lamp connected to the output of the relaying device; and
a power loss monitor for detecting a loss of power from the normal lighting LED driver, and connected to a controller such that when power is lost at the normal lighting LED driver, the first input of the relaying device is connected to the LED lamp, but when the normal LED driver has power, the second input of the relaying device is connected to the LED lamp.
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Accused Products
Abstract
A luminaire for use with power over an Ethernet emergency lighting is disclosed. The luminaire includes a rechargeable battery pack, an emergency backup LED driver, a normal lighting LED driver and an LED lamp. The luminaire also includes a power loss monitor that monitors the presence of normal lighting power present on a power over Ethernet link, and connects the emergency backup LED driver to the LED lamp through a relaying device in the event of a loss of normal lighting power. Furthermore, a method of detecting the power loss in a POE link segment is provided, wherein the method includes detecting a differential DC voltage between a first conductor in a first data pair on the POE link segment and a second conductor in a second data pair on the same POE link segment.
21 Citations
18 Claims
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1. A power over Ethernet emergency luminaire, comprising:
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a first power over Ethernet input connected to a power over Ethernet (“
POE”
) port link segment;a rechargeable emergency battery pack having a battery charger, a rechargeable battery and an emergency LED driver connected to a first input of a relaying device having a first and a second input alternatively switchable to an output; a normal lighting LED driver connected to the second input of the relaying device; an LED lamp connected to the output of the relaying device; and a power loss monitor for detecting a loss of power from the normal lighting LED driver, and connected to a controller such that when power is lost at the normal lighting LED driver, the first input of the relaying device is connected to the LED lamp, but when the normal LED driver has power, the second input of the relaying device is connected to the LED lamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for providing emergency backup power in a POE luminaire, the POE luminaire including a connection to a POE link segment, a lamp driver and a lamp, the system comprising:
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a power loss monitor connected to detect a loss of POE power in the POE link segment; and an emergency backup battery and lamp driver connected to supply power to the lamp when the power loss monitor detects a loss of POE power in the POE link segment.
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18. A method of detecting power loss in a POE link segment, comprising:
detecting a differential DC voltage between a first conductor in a first data pair on the POE link segment and a second conductor in a second data pair on the same POE link segment;
wherein the step of detecting the differential DC voltage includes detecting a decrease in current through a measurement device when the differential DC voltage between the first conductor in the first data pair on the POE link segment and the second conductor in the second data pair on the same POE link segment drops below a predetermined threshold.
Specification