Accurate dimming method and system for ultra-three-color LED light source

Abstract

The invention discloses an accurate dimming method and system for an ultra-three-color LED light source. Firstly, the chromaticity and the brightness of the target light color are set; then a spectralradiometer is utilized to measure the absolute tristimulus value of each light color LED, and the brightness coefficient is calculated to complete the establishment of calibration data; a linear programming model is constructed and solved so as to obtain the normalized brightness initial matching coefficient; the normalized brightness initial matching coefficient is further processed according tothe set target brightness value so as to obtain the final normalized brightness matching coefficient; and the control signal value of each light color LED is obtained by the normalized brightness matching coefficient and the calibration data and further corrected so as to realize the set target light color. The spectral data of the LED light source are not involved in the dimming process, and thedefect that the brightness of the target light color can only be absolute brightness or relative brightness can be overcome and receiving target light colors in various representations is allowed, and thus the amount of data is low and an effective dimming method for realizing applications such as intelligent lighting and dynamic lighting can be provided.

Description

technical field [0001] The present disclosure relates to the related technical field of LED lighting, and in particular, relates to a precise dimming method and system for a super three-color LED light source. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, LED lighting technology has developed rapidly, providing infinite possibilities for the realization of intelligent lighting and dynamic lighting, and is constantly penetrating into various lighting applications. Outstanding advantage. Lighting applications usually use white light. There are two main types of white light LED technologies: one is blue LED chips that excite yellow phosphors to produce white light, and the other is chips that combine multiple light colors to produce white light. The former is currently the most commonly used and widely used white light ...

AI Technical Summary

Problems solved by technology

[0005] The inventor found that most of the existing dimming methods for super three-color LED light sources involve spectrum optimization, complex dimming, and often assume that the luminous characteristics of the LED chip and the control signal satisfy a linear relationship, resulting in a large dimming error

In addition, the existing dimming methods generally require that the brightness of the target light color can only be absolute brightness or relative brightness, which severely limits its application range.

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