Emergency lighting devices with LED strings
First Claim
1. An emergency lighting device comprising:
- a first group of solid state emitters connected in a first string and configured to emit light of a first color, the first group of solid state emitters having an input end and an output end;
a second group of solid state emitters connected in a second string and configured to emit light of a second color, the second group of solid state emitters having an input end and an output end, wherein the input end of the second group of solid state emitters is electrically connected in series to the output end of the first group of solid state emitters;
wherein the first group of solid state emitters is configured to receive a normal operation current at the input end of the first group of solid state emitters, and the second group of solid state emitters is configured to output the normal operation current at the output end of the second group of solid state emitters; and
wherein the first group of solid state emitters is configured to receive an emergency operation current at an emergency input that is different from the input end of the first group of solid state emitters and output the emergency operation current at an emergency output, wherein the emergency input and the emergency output are located between the input end of the first group of solid state emitters and the output end of the second group of solid state emitters such that the emergency operation current is supplied to a first plurality of the first group of solid state emitters and not to a second plurality of the first group of solid state emitters,wherein the first color is different than the second color.
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Accused Products
Abstract
Emergency lighting devices and methods are disclosed. An emergency lighting device includes a first group of solid state emitters configured to emit light of a first color. The emergency lighting device also includes a second group connected in series to the first group and configured to emit a second color. The groups are configured to receive a normal operation current from an LED driver at the input end of the first group and output the normal operation current at the output end of the second group. In an emergency, the first group receives an emergency operation current from an emergency LED driver at an emergency input and outputs the emergency operation current at an emergency output located.
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Citations
28 Claims
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1. An emergency lighting device comprising:
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a first group of solid state emitters connected in a first string and configured to emit light of a first color, the first group of solid state emitters having an input end and an output end; a second group of solid state emitters connected in a second string and configured to emit light of a second color, the second group of solid state emitters having an input end and an output end, wherein the input end of the second group of solid state emitters is electrically connected in series to the output end of the first group of solid state emitters; wherein the first group of solid state emitters is configured to receive a normal operation current at the input end of the first group of solid state emitters, and the second group of solid state emitters is configured to output the normal operation current at the output end of the second group of solid state emitters; and wherein the first group of solid state emitters is configured to receive an emergency operation current at an emergency input that is different from the input end of the first group of solid state emitters and output the emergency operation current at an emergency output, wherein the emergency input and the emergency output are located between the input end of the first group of solid state emitters and the output end of the second group of solid state emitters such that the emergency operation current is supplied to a first plurality of the first group of solid state emitters and not to a second plurality of the first group of solid state emitters, wherein the first color is different than the second color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating an emergency lighting device, comprising:
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receiving a normal operation current at a first group of solid state emitters and a second group of solid state emitters such that the normal operation current is input at an input end of the first group of solid state emitters and output at an output end of the second group of solid state emitters; detecting a loss of input power to the emergency lighting device; and upon the loss of the input power, supplying an emergency operation current at an emergency input that is different from the input end of the first group of solid state emitters and outputting the emergency operation current at an emergency output, wherein the emergency input and the emergency output are located at respective locations between the input end of the first group of solid state emitters and the output end of the second group of solid state emitters, wherein the respective locations are different from the input end of the first group of solid state emitters and the output end of the second group of solid state emitters, and wherein the first group of solid state emitters is configured to emit light of a first color, and the second group of solid state emitters is configured to emit light of a second color, different from the first color. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An emergency lighting device comprising:
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a first group of solid state emitters connected in a first string and configured to emit a light of a first color, the first group of solid state emitters having a first input end and a first output end; a second group of solid state emitters connected in a second string and configured to emit a light of a second color, the second group of solid state emitters having a second input end and a second output end; a third group of solid state emitters connected in a third string and configured to emit a light of a third color, the third group of solid state emitters having a third input end and a third output end, wherein the first, second and third groups of solid state emitters are electrically connected to a first current input at the first, second and third input ends; a second current input having an anode coupled to the first string between first and second ones of the first group of solid state emitters and a cathode coupled to the second string between first and second ones of the second group of solid state emitters; and a diode having an anode coupled to the first string between third and fourth ones of the first group of solid state emitters and a cathode coupled to the second string between third and fourth ones of the second group of solid state emitters. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of operating an emergency lighting device, comprising:
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receiving a normal operation current at a first group of solid state emitters, a second group of solid state emitters and a third group of solid state emitters; and upon loss of the normal operation current, receiving an emergency operation current at the first group of solid state emitters and the second group of solid state emitters such that the emergency operation current is input at an emergency input located between an input end and an output end of the first group of solid state emitters, continues through a diode electrically connecting the first group of solid state emitters to the second group of solid state emitters, and is output at an emergency output located between the input end and the output end of the second group of solid state emitters; wherein the receiving the emergency operation current further comprises receiving, in an alternative emergency operation mode, an alternative emergency operation current at the second group of solid state emitters and the third group of solid state emitters such that the alternative emergency operation current is input at an alternative emergency input located between the input end and the output end of the second group of solid state emitters, continues through a second diode electrically connecting the second group of solid state emitters to the third group of solid state emitters, and is output at an alternative emergency output located between the input end and the output end of the third group of solid state emitters.
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26. An emergency lighting device comprising:
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a first group of solid state emitters configured to receive a normal operation current and to responsively emit light of a first color having a first input end and a first output end; a second group of solid state emitters configured to receive the normal operation current and to responsively emit light of a second color different than the first color having a second input end and a second output end, wherein the first group of solid state emitters and the second group of solid state emitters emit a mixture of light that is a target white color with a Color Rendering Index (CRI) of at least 80; and a third group of solid state emitters configured to receive an emergency operation current upon loss of the normal operation current and emit a light with a CRI less than the CRI of the target white color, wherein the first and second groups of solid state emitters are not configured to receive the emergency operation current. - View Dependent Claims (27, 28)
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Specification