Digitally controlled luminaire system
First Claim
1. A luminaire system for generating light of a desired chromaticity and luminous flux output, the luminaire system comprising:
- (a) one or more arrays, each array comprising one or more light-emitting elements for generating light;
(b) a current driver system operatively coupled to the one or more arrays, the current driver system for selectively supplying electrical drive current to each of the one or more arrays, the current driver system being responsive to one or more drive signals;
(c) one or more optical sensor systems operatively coupled to the one or more light-emitting elements, each optical sensor system comprising one or more optical sensors for sensing a predetermined portion of the light generated by the light-emitting elements, each optical sensor system configured to generate optical signals representative of chromaticity and luminous flux output of the predetermined portion of the light;
(d) a heat sensing system operatively coupled to the one or more arrays, the heat sensing system comprising one or more thermal sensors for generating first signals representative of junction temperatures of each of the one or more arrays, at least one thermal sensor positioned proximate to each of the one or more arrays; and
(e) a controller operatively connected to the current driver system, the one or more optical sensor systems and the heat sensing system;
the controller being configured to generate one or more drive signals in response to the optical signals relative to the desired chromaticity and luminous flux output, the controller further configured to modify the one or more drive signals in response to the first signals thereby compensating for temperature variations of the arrays;
wherein the luminaire system is adapted for connection to a source of power.
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Accused Products
Abstract
The present invention provides a luminaire system capable of generating light of a desired chromaticity and luminous flux output during continuous operation with varying ambient operating temperature. The luminaire system can be further capable of maintaining a desired correlated colour temperature during dimming of the luminaire. The luminaire system comprises one or more arrays of light-emitting elements for generating light with a current driver system coupled thereto for selectively supplying electrical drive current to each of the arrays, wherein the current driver system is responsive to drive signals received from a controller. The luminaire system further comprises an optical sensor system for generating optical signals representative of chromaticity and luminous flux output of the light. A heat sensing system is operatively coupled to the one or more arrays for generating signals representative of the junction temperatures of arrays of light-emitting elements during operation. The luminaire system further comprises a controller that is operatively connected to the current driver system, the optical sensor system and the heat sensing system for receiving the signals generated by each of these systems and is configured to generate one or more drive signals for transmission to the current driver system in response to the optical signals and thermal signals received from the optical system and the heat sensing system, respectively, thereby enabling a desired level of control of the output light.
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Citations
29 Claims
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1. A luminaire system for generating light of a desired chromaticity and luminous flux output, the luminaire system comprising:
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(a) one or more arrays, each array comprising one or more light-emitting elements for generating light; (b) a current driver system operatively coupled to the one or more arrays, the current driver system for selectively supplying electrical drive current to each of the one or more arrays, the current driver system being responsive to one or more drive signals; (c) one or more optical sensor systems operatively coupled to the one or more light-emitting elements, each optical sensor system comprising one or more optical sensors for sensing a predetermined portion of the light generated by the light-emitting elements, each optical sensor system configured to generate optical signals representative of chromaticity and luminous flux output of the predetermined portion of the light; (d) a heat sensing system operatively coupled to the one or more arrays, the heat sensing system comprising one or more thermal sensors for generating first signals representative of junction temperatures of each of the one or more arrays, at least one thermal sensor positioned proximate to each of the one or more arrays; and (e) a controller operatively connected to the current driver system, the one or more optical sensor systems and the heat sensing system;
the controller being configured to generate one or more drive signals in response to the optical signals relative to the desired chromaticity and luminous flux output, the controller further configured to modify the one or more drive signals in response to the first signals thereby compensating for temperature variations of the arrays;wherein the luminaire system is adapted for connection to a source of power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. In a luminaire system a method for controlling operation of light-emitting elements to generate light having a desired chromaticity and luminous flux output, the method comprising the steps of:
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(a) providing drive currents to the light-emitting elements for generation of light; (b) measuring optical signals representative of the light being generated by a optical sensing system; (c) measuring temperature signals representative of junction temperature of the light-emitting elements; (d) evaluating a first modification factor defined by a relationship between junction temperature and light emission characteristics of the light-emitting elements; (e) determining new drive currents based on the measured optical signals, the desired chromaticity and luminous flux output and the first modification factor; (f) providing the new drive currents to the light-emitting elements;
thereby controlling the operation of the light-emitting elements to generate light having the desired chromaticity and luminous flux output. - View Dependent Claims (27, 28, 29)
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Specification