Adjustable light source system used for color selector and light source brightness adjusting method thereof

Abstract

The invention relates to an adjustable light source system used for a color selector. The adjustable light source system comprises an upper computer used for sending adjusting instructions. The signal output end of the upper computer is connected with the input end of an FPGA control circuit used for receiving the adjusting instructions, the output end of the FPGA control circuit is connected with the input end of a DAC conversion circuit, the output end of the DAC conversion circuit is connected with the input end of a constant-current driving circuit, the constant-current driving circuit is used for outputting corresponding current values according to the adjusting instructions and the output end of the constant-current driving circuit is connected with LED lamps arranged on an LED light source panel. The invention further discloses a light source brightness adjusting method of the adjustable light source system used for the color selector. According to the adjustable light source system used for the color selector and the light source brightness adjusting method of the adjustable light source system used for the color selector, the mode that a motor is used for driving a background plate does not need to be adopted, and therefore the cost is greatly reduced; the magnitude of the output currents is controlled through the upper computer, therefore, the precision of the output currents is high and ripple noise is low; through the DAC conversion circuit, the purposes that the currents can be adjusted accurately, the speed is high and current output is continuous are realized. The adjustable light source system is long in service life, the color selecting effect is good and stable and the adjustable light source system can be widely applied to the field of color selectors.

Description

technical field [0001] The invention relates to the technical field of a light source system for a color sorter, in particular to an adjustable light source system for a color sorter and a method for adjusting the brightness of the light source. [0002] Background technique [0003] The color sorter equipment will encounter various materials in the sorting materials. When sorting different materials, it will correspond to different background brightness. This requires that the background brightness can be adjusted in real time in a certain way. At present, most color sorters on the market use the method of rotating the reflective background plate to change the illumination angle of the background light source and then adjust the brightness of the background light source. This requires a rotatable background plate device, and most of them use a motor-driven background plate. High, and the adjustment accuracy is low. The use of an adjustable light source system can not only...

AI Technical Summary

Problems solved by technology

[0004] The patent with the publication number CN202290597U discloses an LED background dimming system for a color sorter, but the patent does not point out a specific technical solution for realizing the background dimming; the patent with the publication number CN202052711U discloses a color sorter Dimmable and color-tunable LED light source, the technical solution adopted in this patent is to use PWM dimming to drive the light source to achieve dimming, but the output current adjusted by PWM pulse mode is intermittent, and the luminous flux cannot be output smoothly and continuously, which will reduce the color Color sorting accuracy of the sorter

Other commonly used LED light source dimming methods include: thyristor phase-cut adjustment, power tube linear amplification adjustment and current sampling switch adjustment. These adjustment methods have certain defects: the thyristor phase-cut adjustment although the output current Continuous, but there is a large power frequency ripple noise in the output current, and there is light flickering phenomenon in the current adjustment in a wide range; the power linear tube amplification adjustment mode has low power efficiency, severe heat generation, and low reliability; the current sampling switch adjustment mode It can continuously and accurately adjust the output current, but the current feedback signal is susceptible to interference, and it is often impossible to adjust the output current in real time and accurately according to the instructions of the host computer

Therefore, none of these methods can meet the high-precision requirements of the color sorter.

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