Method and system for feedback and control of a luminaire
First Claim
1. A system for feedback and control of a luminaire including two or more light-emitting elements in two or more colors, each of the two or more light-emitting elements supplied with electrical current to produce light of a desired chromaticity and luminous flux under operating conditions, the system comprising:
- a) a feedback system including two or more light sensors for detecting the light and generating color signals, and a means for adjusting color signals in order to maintain a desired relative resolution, the feedback system operating at a sampling frequency and generating current values representative of luminous flux and chromaticity of the light from the color signals, the feedback system further including two or more color filters associated with the two or more light sensors for providing the color signals; and
b) a control system operatively integrated with the feedback system for determining an adjustment factor through a correlation of the current values and a desired chromaticity and luminous flux and for altering the sampling frequency of the feedback system, the control system interdependently adjusting the electrical current to at least one of the two or more light-emitting elements in accordance with the adjustment factor without perceivable visual flicker or momentary chromaticity shifts.
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Accused Products
Abstract
A method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire includes one or more light-emitting elements and one or more light sensors for providing optical feedback, which is filtered to remove undesired frequencies. The method and system employs 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
21 Claims
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1. A system for feedback and control of a luminaire including two or more light-emitting elements in two or more colors, each of the two or more light-emitting elements supplied with electrical current to produce light of a desired chromaticity and luminous flux under operating conditions, the system comprising:
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a) a feedback system including two or more light sensors for detecting the light and generating color signals, and a means for adjusting color signals in order to maintain a desired relative resolution, the feedback system operating at a sampling frequency and generating current values representative of luminous flux and chromaticity of the light from the color signals, the feedback system further including two or more color filters associated with the two or more light sensors for providing the color signals; and b) a control system operatively integrated with the feedback system for determining an adjustment factor through a correlation of the current values and a desired chromaticity and luminous flux and for altering the sampling frequency of the feedback system, the control system interdependently adjusting the electrical current to at least one of the two or more light-emitting elements in accordance with the adjustment factor 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, 21)
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20. A method for controlling a luminaire including two or more light-emitting elements in two or more colors, each of the two or more light-emitting elements supplied with electrical current to produce light of desired chromaticity and luminous flux under operating conditions, the method comprising steps of:
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a) sensing, using two or more light sensors, predetermined fractions of light emitted by the luminaire in each of the two or more colors providing two or more sensed color signals; b) adjusting the sensed color signals in order to maintain a desired relative resolution; c) processing, using two or more color filters associated with the two or more light sensors, each of the two or more sensed color signals thereby determining two or more filtered color signals; d) transforming the two or more filtered color signals directly into control signals representative of the desired chromaticity and luminous flux; and e) interdependently adjusting electrical current supplied to each of the two 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