LED mixed lighting system with adjustable color temperature and light modulation method thereof

Abstract

The invention discloses a color temperature adjustable LED mixed lighting light modulation method comprising the following steps: S1, setting the color temperature and lightness level of the lighting system, and entering the next step; S2, searching various LED driving current values according to a searching table when a micro-processing system receives a set signal, forming a current control signal, and entering the next step; S3, allowing all DC drivers to form corresponding driving currents after receiving the current control signal, driving all LEDs to illuminate, and entering the next step; S4, allowing all LEDs to light up so as to form the mixed lighting effect, and reaching corresponding illumination demands. The system uses more than two LEDs of different color temperatures to mix the lights, thus providing color temperature adjustable effect and the relative constant color temperatures in the LED light intensity adjusting scope, and dividing the light intensity adjusting grades according to the human eye perception (lightness) on the light intensity.

Description

technical field [0001] The invention relates to the field of LED intelligent dimming, in particular to an LED mixed light lighting system with adjustable color temperature and a dimming method thereof. Background technique [0002] Due to its high luminous efficiency, long service life, safety and reliability, LED lighting has gradually replaced traditional lighting in recent years and has been widely used and promoted in various applications. Various researches to improve its performance are also getting more and more in-depth. The dimming of LED lighting system is an important direction of research. At present, the main dimming methods of LED lighting include pulse width modulation (PWM) and linear regulation. PWM controls the brightness by controlling the duty cycle of the high-frequency on-off current. This method can achieve the purpose of precise adjustment, but there is a flicker problem that is not detectable by the human eye, and there are potential health risks. ...

AI Technical Summary

Problems solved by technology

[0004] The color temperature compensation method disclosed in the invention patent ZL201510031334.X directly establishes the relationship between the current and the relative color temperature, and the same relative color temperature corresponds to a series of chromaticity coordinate points on the chromaticity diagram, which is not unique. This series of the same color temperature The coordinate points are called "isothermal lines", and it is not accurate to quantify the chromaticity difference with the difference in color temperature

Moreover, the selection of fitting discrete points in the operation process described in this patent is extremely limited, and the calculation method of the mixed color temperature is also extremely rough and imprecise. This series of approximate theoretical basis and approximate operation process will inevitably cause a gap between theoretical expectations and actual conditions There is a large deviation, making it impossible to achieve accurate color temperature compensation

[0005] In addition, the adjustment of light intensity in the existing LED dimming process has not taken into account the human eye's perception of light intensity, that is, the relationship between "brightness" and the objective brightness measured by measuring equipment. Adjustment based on objective brightness

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