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Luminaire control system and method

A controller, coordinate system technology, applied in the field of lighting

Active Publication Date: 2009-10-14
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] So luminaire feedback control systems can withstand a number of effects, including the problem that RGB sensors with different sensitivities will provide different unique responses to light from the same SPD

Method used

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  • Luminaire control system and method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053] In a first instance, the control system can be configured to read RGB sensor data [RGB] and apply a predetermined transformation to derive approximations of the CIE tristimulus values ​​X, Y and Z of the light emitted by the LEE. This can be performed, for example, by programming the control system using the linear algebraic relationship

[X Y Z]=[R G B]T (3)

Use a 3×3 transformation matrix

T=(N T N) -1 N T M=N + M (4)

N T is the transpose and N + is the pseudo-inverse of N. M is the ideal three-color excitation value M ij The n×3 matrix of and N is the corresponding n×3 matrix of RGB color sensor data for the same set of n SPDs. M and N can be determined during a calibration step using n SPDs and characterizing them with RGB color sensors to determine N and, for example, M with a precisely calibrated spectrometer. Next determine T by the minimum error function e.g. by the least squares solution

This approach can provide a way to mitigate the average...

example 2

[0060] In another embodiment, it may be advantageous in terms of computational efficiency to operate the control system directly using the feedback raw RGB sensor data. In such an embodiment, the control system no longer has to transform RGB sensor data every time that data is fed back. Instead, user-specified input data is transformed from coordinates such as, for example, XYZ tristimulus or xyY chromaticity and intensity to RGB sensor coordinates so that the control system compares the adjustment points with the RGB color feedback data. In such an embodiment, the transformation needs to occur only when the user specifies that the input data changes. In this embodiment the control system operates in RGB sensor coordinates to set and maintain desired chromaticity and intensity.

[0061] For a predetermined transformation T, the target RGB values ​​can be determined from the following equation:

[R T G T B T ]=[X Y Z]T -1 (11)

It should be noted that t...

example 3

[0063]In this embodiment the controller is configured to transform each of the one or more predetermined RGB sensor data into a respective predetermined desired color space, e.g. XYZ data while transforming the remaining RGB sensor data as described above The training set, even though the mean least squared error of the remaining data is increased. This embodiment can be used to ensure that the control system is able to perform a calibration process that maintains white light RGB sensor data.

[0064] Additional constraints on the calibration method can be expressed as M w =N w T, where N w is the RGB sensor data for the intended "white" SPD, and M w is the corresponding XYZ tristimulus value. The transformation matrix can be determined by the following equation:

T j = ( N T N ) - ...

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PUM

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Abstract

The present invention provides a system and method for controlling one or more light-emitting elements which are driven by forward currents to generate mixed light for use, for example, through a luminaire. The system has one or more light sensors for acquiring feedback optical sensor data and a user interface for providing reference data representative of a desired mixed light. The system also has a controller for transforming either the sensor data or the reference data into the coordinate space of the other and to determine a difference between the sensor and the reference data in that coordinate space. The controller is configured to adjust the forward currents during operating conditions so that the sensor data matches the setpoint data. The present invention also provides a system and method that can at least partially compensate certain temperature induced effects when transforming the optical sensor or the reference data.

Description

technical field [0001] The present invention relates to the field of lighting and more particularly to the control of the color and intensity of light emitted by a light source. Background technique [0002] Advances in the development and improvement of the luminous flux of light emitting devices such as solid semiconductors and organic light emitting diodes (LEDs) have made these devices suitable for use in common lighting applications, including architectural, entertainment, and highway lighting. Light emitting diodes are gradually becoming competitive with light sources such as incandescent lamps, fluorescent lamps, and high intensity discharge lamps. [0003] One of the challenges of solid-state lighting is designing systems and / or methods that can set and maintain the intensity and chromaticity of mixed light emitted by multi-color, eg, blue and yellow or red, green and blue LEDs. This can be a challenge when the light emitted by the LED can vary depending on the oper...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B33/08H05B44/00
CPCH05B45/22H05B45/20
Inventor M·萨尔斯伯里I·阿什当D·L·B·史密斯S·P·罗宾逊I·斯佩尔
Owner SIGNIFY HLDG BV
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