METHOD AND SYSTEM FOR FEEDBACK AND CONTROL OF A LUMINAIRE
First Claim
1. A system for feedback and control of a luminaire including one or more light-emitting elements in one or more colours, each of the one or more light-emitting elements supplied with electrical current to produce light of a desired chromaticity and luminous flux under operating conditions, said system comprising:
- a) a feedback system including one or more light sensors for detecting the light and generating light values, said feedback system includes a means to adjust the light values in order to maintain a desired relative resolution, said feedback system generating current values representative of luminous flux and chromaticity of the light from the light values; and
b) a control system operatively integrated with the feedback system, said control system determining an adjustment factor through a correlation of the current values and a desired chromaticity and luminous flux, said control system interdependently adjusting the electrical current to one or more light-emitting elements in accordance with said adjustment factor, said control system adjusting the electrical current without perceivable visual flicker or momentary chromaticity shifts.
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Abstract
The present invention comprises a method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire comprises one or more light-emitting elements and one or more light sensors which can provide optical feedback, wherein this optical feedback is filtered to remove undesired frequencies. The method and system comprises a control system which can sample the filtered signals from the light sensors according to a predetermined feedback sampling frequency scheme, wherein this scheme is specifically configured to provide sufficient iterations of the feedback loop to be performed for adjustment of the chromaticity and luminous flux output of the light-emitting elements, without perceptible visual flicker or momentary chromaticity shifts.
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Citations
20 Claims
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1. A system for feedback and control of a luminaire including one or more light-emitting elements in one or more colours, each of the one or more light-emitting elements supplied with electrical current to produce light of a desired chromaticity and luminous flux under operating conditions, said system comprising:
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a) a feedback system including one or more light sensors for detecting the light and generating light values, said feedback system includes a means to adjust the light values in order to maintain a desired relative resolution, said feedback system generating current values representative of luminous flux and chromaticity of the light from the light values; and
b) a control system operatively integrated with the feedback system, said control system determining an adjustment factor through a correlation of the current values and a desired chromaticity and luminous flux, said control system interdependently adjusting the electrical current to one or more light-emitting elements in accordance with said adjustment factor, said control system adjusting the electrical current without perceivable visual flicker or momentary chromaticity shifts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for controlling a luminaire including one or more light-emitting elements in one or more colours, each of the one or more light-emitting elements supplied with electrical current to produce light of desired chromaticity and luminous flux under operating conditions, the method comprising the steps of:
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a) sensing predetermined fractions of light emitted by the luminaire in each of the one or more colours providing one or more sensed colour signals;
b) processing each of the one or more sensed colour signals thereby determining one or more filtered colour signals, said processing including adjusting the sensed colour signals in order to maintain a desired relative resolution;
c) transforming the one or more filtered colour signals directly into control signals representative of the desired chromaticity and luminous flux; and
d) interdependently adjusting electrical current supplied to each of the one or more light-emitting elements based on the control signals, wherein the step of adjusting is performed without perceivable visual flicker or momentary chromaticity shifts.
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Specification